GEO -(VII)-LESSON -4
AIR
(QUESTION
ANSWERS)
NCERT EXERCISE
(i) What is the
atmosphere?
Answer: The blanket of
air surrounding the earth is called the atmosphere. The atmosphere primarily
comprises nitrogen and oxygen in bulk and other gases like carbon dioxide,
helium, ozone, etc in lesser quantities.
(ii) Which two
gases make the bulk of the atmosphere?
Answer: The two gases
that make the bulk of the atmosphere are:
1.
Oxygen (21%)
2.
Nitrogen (78%)
(iii) Which gas
creates a greenhouse effect in the atmosphere?
Answer: Carbon dioxide
is the gas that creates the greenhouse effect in the atmosphere.
(iv) What is
the weather?
Answer: The hour to
hour or the day to day condition of the atmosphere is called weather. Weather
can change dramatically from day-to-day. It may be classified as hot, dry, cold
or wet.
(v) Name three
types of rainfall?
Answer: The three
types of rainfall are as follows:
1.
Convectional
rainfall
2.
Orographic
rainfall
3.
Cyclonic
rainfall
(vi) What is
air pressure?
Answer: Air pressure is defined as the pressure exerted by the weight of air on the earth’s surface. The air pressure decreases as height increases and is the highest at the sea level.
2. Tick the
correct answer.
(i) Which of
the following gases protects us from harmful sun rays?
(a) Carbon dioxide
(b) Nitrogen
(c) Ozone
Answer: c
(ii) The most
important layer of the atmosphere is
(a) Troposphere
(b) Thermosphere
(c) Mesosphere
Answer: a
(iii) Which of
the following layers of the atmosphere is free from clouds?
(a) Troposphere
(b) Stratosphere
(c) Mesosphere
Answer: b
(iv) As we go
up the layers of the atmosphere, the pressure
(a) Increases
(b) Decreases
(c) Remains the same
Answer: b
(v) When
precipitation comes down to the earth in the liquid form, it is called
(a) Cloud
(b) Rain
(c) Snow
Answer: b
3. Match the
following.
|
(i) Trade Winds |
(a) Incoming solar energy |
|
(ii) Loo |
(b) Seasonal wind |
|
(iii) Monsoon |
(c) The horizontal movement of Air |
|
(iv) Wind |
(d) A layer of ozone gas |
|
(v) Insolation |
(e) Permanent wind |
|
(vi) Ozon layer |
(f) Local wind |
Answer:
(i)-e, (ii)-f, (iii)-b,
(iv)-c, (v)-a, (vi)-d
4. Give
reasons.
(i) Wet clothes
take longer time to dry on a humid day?
Answer: Wet clothes
take longer time to dry on a humid day because the amount of water in the air
is more on a humid day than on a sunny day. Due to which, the rate of
evaporation decreases and air soaks in less water from the clothes.
(ii) Amount of
insolation decreases from the equator towards poles?
Answer: Insolation is
the incoming solar energy intercepted by the earth. Amount of insolation
decreases from the equator toward poles, because sun rays fall vertically on
the equator and slant on the poles.
OTHER IMPORTANT QUESTIONS
1. Which gas released in the atmosphere
creates a greenhouse effect trapping the heat?
(a) Carbon dioxide
(b) Oxygen
(c) Nitrogen
(d) All of these
2. Excess
amount of CO2 is
responsible for
(a) global cooling
(b) global warming
(c) both (a) and (b)
(d) none of these
3. What
are the important objects for survival of plants and animals?
(a) Rainfall
(b) Sun light
(c) Oxygen
(d) All of these
4. Which one
of the following gases is present in the atmosphere in the highest amount?
(a) Oxygen
(b) Carbon dioxide
(c) Nitrogen
(d) Lithium
5. Which gas
is used by the green plants to make their food?
(a) Oxygen
(b) Carbon dioxide
(c) Nitrogen
(d) None of these
6. Which is
the important gas used by human beings for breathing?
(a) Nitrogen
(b) Carbon dioxide
(c) Oxygen
(d) Sodium chloride
7. When
the air is heated it becomes
(a) Lighter?
(b) Heavier?
(c) Colder?
(d) None of these
8. What is
the average height of the troposphere?
(a) 3 km
(b) 6 km
(c) 9 km
(d) 13 km
9. As we go
up in troposphere layer of the atmosphere the pressure
(a) increases
(b) decreases
(c) no change
(d) all of these
10. Which
one of the following gases protects us from harmful sun’s rays?
(a) Ozone
(b) Nitrogen
(c) Carbon dioxide
(d) Oxygen
11. Which of
the following are part of weather forecast in the newspapers?
(a) Temperature
(b) Humidity
(c) Time of Sunset
(d) All of These
12. Which element of weather is measured in degree
Celsius?
(a) Temperature
(b) Pressure
(c) Wind
(d) Gravity
13. The water boils at
(a) 10°C
(b) 50°C
(c) 75°C
(d) 100°C
14. Where is the air pressure highest?
(a) Moon
(b) Sea Level
(c) Stratosphere
(d) Exosphere
15. What is very hot wind called?
(a) Loo
(b) Cool breeze
(c) Monsoon air
(d) Trade wind
16. Which one of the following is a local wind?
(a) Sea breeze
(b) Trade wind
(c) Monsoon wind
(d) None of these
17. Rain, snow sleet or hail are the different
forms of:
(a) Condensation
(b) Evaporation
(c) Precipitation
(d) All of these
Fill in the blanks with appropriate words:1. Earth
is surrounded by a blanket of air called ……… ….
2. Green plants produce …………. during
photosynthesis.
3. Increased volume of ………….. is affecting the
earth’s weather and climate.
4. Ionosphere is the part of ……………
5. Amount of rainfall is measured by ………….
6. Insolation influences the distribution of …………….
State whether the given statements are true or
false.1. Hot
air is dense and heavy and cold air is lighter and expands.
2. Without Greenhouse effect earth would have been
too cold to live.
3. Ionosphere contains the ozone layer.
4. Helium and hydrogen float from exosphere into
space.
5. Wind-vane shows the direction of wind.
6. Air moves from high pressure to low pressure.
ANSWERSMCQS
1
2
3
4
5
6
7
8
9
10
A
B
D
C
A
C
A
D
B
A
11
12
13
14
15
16
17
D
A
D
B
A
A
C
FILL IN
THE BLANKS
1. Atmosphere,
2- Oxygen, 3-co2, 4-Thermosphere, 5- rainguage,, 6-Temprature
True/
false
1.False, 2- True,
3- False 4. True, 5- True, 6.-True
1. How does carbon dioxide
create green house effect?
Answer: Crbon dioxide creates greenhouse effect by trapping
the heat radiated from the earth.
2. What is the significance
of greenhouse gas?
Answer: Without the greenhouse gas the earth would have been
too cold to line in.
3. What happens when air is
heated?
Answer: When air is heated, it expands, becomes lighter and goes
up.
4. What is the nature of
cold air?
Ans. It has tendency to go down.
5. Why do green plants use
carbon dioxide? [Imp.]
Answer: Green plants use carbon dioxide to make their food
and release oxygen.
6. What is an important
feature of Stratosphere?
Answer: Stratosphere contains a layer of ozone gas.
7. How is ozone important
for us? [Imp.]
Answer: It protects us from the harmful effect of the sunrays.
8. What is temperature?
Answer: The degree of hotness and coldness of the air is known as
temperature.
9. What is insolation?
Answer: Insolation is the incoming solar energy intercepted
by the earth.
10. Why is there no air
pressure on the moon?
Answer: There is no air on the moon and therefore no air pressure.
11. Where is air pressure
highest?
Answer: Air pressure is highest at the sea level.
12. How does air move?
Answer: Air moves from high pressure areas to low pressure
areas.
13. Name three types of
winds.
Answer:
1.
Permanent winds
2.
Seasonal winds
3.
Local winds.
14. What is the hot
and dry wind of northern planes of India called?
Ans. It is called loo.
Q.15 What is called humidity? [V. Imp.]
Ans. Moisture in the air at any time is called humidity.
Q 16 Why do we feel uncomfortable on a humid day?
Ans. It is because sweat from our body does not evaporate easily.
Q.17 How is the flooding of low lying areas caused? [V. Imp.]
Ans. When trees on hill sides are cut, rainwater flows down the bare
mountains. This causes flooding of low lying areas.
Q.18 Name various forms of precipitation.
Ans.
1.
Rain
2.
Snow
3.
Sleet
4.
Hail
Q.19 How is a wind named?
Ans. A wind is named after the direction from which it
blows.
SHORT ANSWER TYPE QUESTIONS
Q.1 Give an account of the composition of the atmosphere. [V. Imp.]
Ans. Our atmosphere is composed of mainly two gases—nitrogen (78%)
and oxygen (21%). Other gases like carbon dioxide, helium, ozone, orgon and
hydrogen are found in lesser quantities. Apart from these gases, tiny dust
particles are also present in the air.
Q.2 How do Bacteria help plants use nitrogen? [V. Imp.]
Ans. Nitrogen is essential for the survival of the plant. But
plants cannot take nitrogen directly from the air. Bacteria, that live in the
soil and roots of some plants, take nitrogen from the air and change its form
so that plants can use it.
Q.3 How does nature balance our life? What is the result if this balance
is disturbed?[V. Imp.]
Ans. Green plants use carbon dioxide to make their food and release
oxygen. Humans or animals release carbon dioxide. The amount of carbon dioxide
released by humans or animals seems to be equal to the amount used by the
plants which make a perfect balance. But this balance is disturbed by the burning
of fuels, which add billions of tons of carbon dioxide in the atmosphere. As a
result, the increased volume of carbon dioxide is affecting the earth’s weather
and climate.
Q.4 Why is temperature in cities much higher than that of villages ?
Ans. In cities, we find high rise buildings. The concrete and metals in
these buildings and the asaphalt of roads get heated up during the day. This
heat is released during the night.
Another reason is that the crowded high rise buildings of the cities trap the
warm air and thus raise the temperature of the cities.
Q.5 Write a short note on the distribution of air pressure in the
atmosphere. [Imp.]
Ans. Air pressure is the pressure exerted by the weight of air on the
earth’s surface. As we go up the layers of the atmosphere, the pressure falls
rapidly. The air pressure is highest at the sea level and decreases with
height. Horizonally the distribution of air pressure is influenced by the
temperature of the air at a given place. In areas where the temperature is high
the air gets heated and rises. This creates a low-pressure area. In areas
having lower temperature, the air is cold, hence, it is heavy. Heavy air sinks
and creates a high-pressure area.
Q.6 Why do astronauts wear special protective suits when they go to the
moon?
Ans. Astronauts wear special protective space suits filled with air when
they go to the moon. If they did not wear these space suits, the counter
pressure exerted by the body of the astronauts would make the blood vessels
burst. The astronauts would bleed.
Q.7 How is rainfall important for us? What happens when there is excess
rain? [V. Imp.]
Ans. Rainfall is very important for the survival of plants and animals.
It brings fresh water to the earth’s surface. If rainfall is less, there is
water scarcity which sometimes causes drought like situation. If there is
excess rain, floods take place which makes the life of the affected people
miserable.
3. What
are the important objects for survival of plants and animals?
(a) Rainfall
(b) Sun light
(c) Oxygen
(d) All of these
4. Which one
of the following gases is present in the atmosphere in the highest amount?
(a) Oxygen
(b) Carbon dioxide
(c) Nitrogen
(d) Lithium
5. Which gas
is used by the green plants to make their food?
(a) Oxygen
(b) Carbon dioxide
(c) Nitrogen
(d) None of these
6. Which is
the important gas used by human beings for breathing?
(a) Nitrogen
(b) Carbon dioxide
(c) Oxygen
(d) Sodium chloride
7. When
the air is heated it becomes
(a) Lighter?
(b) Heavier?
(c) Colder?
(d) None of these
8. What is
the average height of the troposphere?
(a) 3 km
(b) 6 km
(c) 9 km
(d) 13 km
9. As we go
up in troposphere layer of the atmosphere the pressure
(a) increases
(b) decreases
(c) no change
(d) all of these
10. Which
one of the following gases protects us from harmful sun’s rays?
(a) Ozone
(b) Nitrogen
(c) Carbon dioxide
(d) Oxygen
11. Which of
the following are part of weather forecast in the newspapers?
(a) Temperature
(b) Humidity
(c) Time of Sunset
(d) All of These
12. Which element of weather is measured in degree
Celsius?
(a) Temperature
(b) Pressure
(c) Wind
(d) Gravity
13. The water boils at
(a) 10°C
(b) 50°C
(c) 75°C
(d) 100°C
14. Where is the air pressure highest?
(a) Moon
(b) Sea Level
(c) Stratosphere
(d) Exosphere
15. What is very hot wind called?
(a) Loo
(b) Cool breeze
(c) Monsoon air
(d) Trade wind
16. Which one of the following is a local wind?
(a) Sea breeze
(b) Trade wind
(c) Monsoon wind
(d) None of these
17. Rain, snow sleet or hail are the different
forms of:
(a) Condensation
(b) Evaporation
(c) Precipitation
(d) All of these
Fill in the blanks with appropriate words:1. Earth
is surrounded by a blanket of air called ……… ….
2. Green plants produce …………. during
photosynthesis.
3. Increased volume of ………….. is affecting the
earth’s weather and climate.
4. Ionosphere is the part of ……………
5. Amount of rainfall is measured by ………….
6. Insolation influences the distribution of …………….
State whether the given statements are true or
false.1. Hot
air is dense and heavy and cold air is lighter and expands.
2. Without Greenhouse effect earth would have been
too cold to live.
3. Ionosphere contains the ozone layer.
4. Helium and hydrogen float from exosphere into
space.
5. Wind-vane shows the direction of wind.
6. Air moves from high pressure to low pressure.
ANSWERSMCQS
1
2
3
4
5
6
7
8
9
10
A
B
D
C
A
C
A
D
B
A
11
12
13
14
15
16
17
D
A
D
B
A
A
C
FILL IN
THE BLANKS
1. Atmosphere,
2- Oxygen, 3-co2, 4-Thermosphere, 5- rainguage,, 6-Temprature
True/
false
1.False, 2- True,
3- False 4. True, 5- True, 6.-True
1. How does carbon dioxide
create green house effect?
Answer: Crbon dioxide creates greenhouse effect by trapping
the heat radiated from the earth.
2. What is the significance
of greenhouse gas?
Answer: Without the greenhouse gas the earth would have been
too cold to line in.
3. What happens when air is
heated?
Answer: When air is heated, it expands, becomes lighter and goes
up.
4. What is the nature of
cold air?
Ans. It has tendency to go down.
5. Why do green plants use
carbon dioxide? [Imp.]
Answer: Green plants use carbon dioxide to make their food
and release oxygen.
6. What is an important
feature of Stratosphere?
Answer: Stratosphere contains a layer of ozone gas.
7. How is ozone important
for us? [Imp.]
Answer: It protects us from the harmful effect of the sunrays.
8. What is temperature?
Answer: The degree of hotness and coldness of the air is known as
temperature.
9. What is insolation?
Answer: Insolation is the incoming solar energy intercepted
by the earth.
10. Why is there no air
pressure on the moon?
Answer: There is no air on the moon and therefore no air pressure.
11. Where is air pressure
highest?
Answer: Air pressure is highest at the sea level.
12. How does air move?
Answer: Air moves from high pressure areas to low pressure
areas.
13. Name three types of
winds.
Answer:
1.
Permanent winds
2.
Seasonal winds
3.
Local winds.
14. What is the hot
and dry wind of northern planes of India called?
Ans. It is called loo.
Q.15 What is called humidity? [V. Imp.]
Ans. Moisture in the air at any time is called humidity.
Q 16 Why do we feel uncomfortable on a humid day?
Ans. It is because sweat from our body does not evaporate easily.
Q.17 How is the flooding of low lying areas caused? [V. Imp.]
Ans. When trees on hill sides are cut, rainwater flows down the bare
mountains. This causes flooding of low lying areas.
Q.18 Name various forms of precipitation.
Ans.
1.
Rain
2.
Snow
3.
Sleet
4.
Hail
Q.19 How is a wind named?
Ans. A wind is named after the direction from which it
blows.
SHORT ANSWER TYPE QUESTIONS
Q.1 Give an account of the composition of the atmosphere. [V. Imp.]
Ans. Our atmosphere is composed of mainly two gases—nitrogen (78%)
and oxygen (21%). Other gases like carbon dioxide, helium, ozone, orgon and
hydrogen are found in lesser quantities. Apart from these gases, tiny dust
particles are also present in the air.
Q.2 How do Bacteria help plants use nitrogen? [V. Imp.]
Ans. Nitrogen is essential for the survival of the plant. But
plants cannot take nitrogen directly from the air. Bacteria, that live in the
soil and roots of some plants, take nitrogen from the air and change its form
so that plants can use it.
Q.3 How does nature balance our life? What is the result if this balance
is disturbed?[V. Imp.]
Ans. Green plants use carbon dioxide to make their food and release
oxygen. Humans or animals release carbon dioxide. The amount of carbon dioxide
released by humans or animals seems to be equal to the amount used by the
plants which make a perfect balance. But this balance is disturbed by the burning
of fuels, which add billions of tons of carbon dioxide in the atmosphere. As a
result, the increased volume of carbon dioxide is affecting the earth’s weather
and climate.
Q.4 Why is temperature in cities much higher than that of villages ?
Ans. In cities, we find high rise buildings. The concrete and metals in
these buildings and the asaphalt of roads get heated up during the day. This
heat is released during the night.
Another reason is that the crowded high rise buildings of the cities trap the
warm air and thus raise the temperature of the cities.
Q.5 Write a short note on the distribution of air pressure in the
atmosphere. [Imp.]
Ans. Air pressure is the pressure exerted by the weight of air on the
earth’s surface. As we go up the layers of the atmosphere, the pressure falls
rapidly. The air pressure is highest at the sea level and decreases with
height. Horizonally the distribution of air pressure is influenced by the
temperature of the air at a given place. In areas where the temperature is high
the air gets heated and rises. This creates a low-pressure area. In areas
having lower temperature, the air is cold, hence, it is heavy. Heavy air sinks
and creates a high-pressure area.
Q.6 Why do astronauts wear special protective suits when they go to the
moon?
Ans. Astronauts wear special protective space suits filled with air when
they go to the moon. If they did not wear these space suits, the counter
pressure exerted by the body of the astronauts would make the blood vessels
burst. The astronauts would bleed.
Q.7 How is rainfall important for us? What happens when there is excess
rain? [V. Imp.]
Ans. Rainfall is very important for the survival of plants and animals.
It brings fresh water to the earth’s surface. If rainfall is less, there is
water scarcity which sometimes causes drought like situation. If there is
excess rain, floods take place which makes the life of the affected people
miserable.
4. Which one
of the following gases is present in the atmosphere in the highest amount?
(a) Oxygen
(b) Carbon dioxide
(c) Nitrogen
(d) Lithium
5. Which gas
is used by the green plants to make their food?
(a) Oxygen
(b) Carbon dioxide
(c) Nitrogen
(d) None of these
6. Which is
the important gas used by human beings for breathing?
(a) Nitrogen
(b) Carbon dioxide
(c) Oxygen
(d) Sodium chloride
7. When
the air is heated it becomes
(a) Lighter?
(b) Heavier?
(c) Colder?
(d) None of these
8. What is
the average height of the troposphere?
(a) 3 km
(b) 6 km
(c) 9 km
(d) 13 km
9. As we go
up in troposphere layer of the atmosphere the pressure
(a) increases
(b) decreases
(c) no change
(d) all of these
10. Which
one of the following gases protects us from harmful sun’s rays?
(a) Ozone
(b) Nitrogen
(c) Carbon dioxide
(d) Oxygen
11. Which of
the following are part of weather forecast in the newspapers?
(a) Temperature
(b) Humidity
(c) Time of Sunset
(d) All of These
12. Which element of weather is measured in degree
Celsius?
(a) Temperature
(b) Pressure
(c) Wind
(d) Gravity
13. The water boils at
(a) 10°C
(b) 50°C
(c) 75°C
(d) 100°C
14. Where is the air pressure highest?
(a) Moon
(b) Sea Level
(c) Stratosphere
(d) Exosphere
15. What is very hot wind called?
(a) Loo
(b) Cool breeze
(c) Monsoon air
(d) Trade wind
16. Which one of the following is a local wind?
(a) Sea breeze
(b) Trade wind
(c) Monsoon wind
(d) None of these
17. Rain, snow sleet or hail are the different
forms of:
(a) Condensation
(b) Evaporation
(c) Precipitation
(d) All of these
Fill in the blanks with appropriate words:1. Earth
is surrounded by a blanket of air called ……… ….
2. Green plants produce …………. during
photosynthesis.
3. Increased volume of ………….. is affecting the
earth’s weather and climate.
4. Ionosphere is the part of ……………
5. Amount of rainfall is measured by ………….
6. Insolation influences the distribution of …………….
State whether the given statements are true or
false.1. Hot
air is dense and heavy and cold air is lighter and expands.
2. Without Greenhouse effect earth would have been
too cold to live.
3. Ionosphere contains the ozone layer.
4. Helium and hydrogen float from exosphere into
space.
5. Wind-vane shows the direction of wind.
6. Air moves from high pressure to low pressure.
ANSWERSMCQS
1
2
3
4
5
6
7
8
9
10
A
B
D
C
A
C
A
D
B
A
11
12
13
14
15
16
17
D
A
D
B
A
A
C
FILL IN
THE BLANKS
1. Atmosphere,
2- Oxygen, 3-co2, 4-Thermosphere, 5- rainguage,, 6-Temprature
True/
false
1.False, 2- True,
3- False 4. True, 5- True, 6.-True
1. How does carbon dioxide
create green house effect?
Answer: Crbon dioxide creates greenhouse effect by trapping
the heat radiated from the earth.
2. What is the significance
of greenhouse gas?
Answer: Without the greenhouse gas the earth would have been
too cold to line in.
3. What happens when air is
heated?
Answer: When air is heated, it expands, becomes lighter and goes
up.
4. What is the nature of
cold air?
Ans. It has tendency to go down.
5. Why do green plants use
carbon dioxide? [Imp.]
Answer: Green plants use carbon dioxide to make their food
and release oxygen.
6. What is an important
feature of Stratosphere?
Answer: Stratosphere contains a layer of ozone gas.
7. How is ozone important
for us? [Imp.]
Answer: It protects us from the harmful effect of the sunrays.
8. What is temperature?
Answer: The degree of hotness and coldness of the air is known as
temperature.
9. What is insolation?
Answer: Insolation is the incoming solar energy intercepted
by the earth.
10. Why is there no air
pressure on the moon?
Answer: There is no air on the moon and therefore no air pressure.
11. Where is air pressure
highest?
Answer: Air pressure is highest at the sea level.
12. How does air move?
Answer: Air moves from high pressure areas to low pressure
areas.
13. Name three types of
winds.
Answer:
1.
Permanent winds
2.
Seasonal winds
3.
Local winds.
14. What is the hot
and dry wind of northern planes of India called?
Ans. It is called loo.
Q.15 What is called humidity? [V. Imp.]
Ans. Moisture in the air at any time is called humidity.
Q 16 Why do we feel uncomfortable on a humid day?
Ans. It is because sweat from our body does not evaporate easily.
Q.17 How is the flooding of low lying areas caused? [V. Imp.]
Ans. When trees on hill sides are cut, rainwater flows down the bare
mountains. This causes flooding of low lying areas.
Q.18 Name various forms of precipitation.
Ans.
1.
Rain
2.
Snow
3.
Sleet
4.
Hail
Q.19 How is a wind named?
Ans. A wind is named after the direction from which it
blows.
SHORT ANSWER TYPE QUESTIONS
Q.1 Give an account of the composition of the atmosphere. [V. Imp.]
Ans. Our atmosphere is composed of mainly two gases—nitrogen (78%)
and oxygen (21%). Other gases like carbon dioxide, helium, ozone, orgon and
hydrogen are found in lesser quantities. Apart from these gases, tiny dust
particles are also present in the air.
Q.2 How do Bacteria help plants use nitrogen? [V. Imp.]
Ans. Nitrogen is essential for the survival of the plant. But
plants cannot take nitrogen directly from the air. Bacteria, that live in the
soil and roots of some plants, take nitrogen from the air and change its form
so that plants can use it.
Q.3 How does nature balance our life? What is the result if this balance
is disturbed?[V. Imp.]
Ans. Green plants use carbon dioxide to make their food and release
oxygen. Humans or animals release carbon dioxide. The amount of carbon dioxide
released by humans or animals seems to be equal to the amount used by the
plants which make a perfect balance. But this balance is disturbed by the burning
of fuels, which add billions of tons of carbon dioxide in the atmosphere. As a
result, the increased volume of carbon dioxide is affecting the earth’s weather
and climate.
Q.4 Why is temperature in cities much higher than that of villages ?
Ans. In cities, we find high rise buildings. The concrete and metals in
these buildings and the asaphalt of roads get heated up during the day. This
heat is released during the night.
Another reason is that the crowded high rise buildings of the cities trap the
warm air and thus raise the temperature of the cities.
Q.5 Write a short note on the distribution of air pressure in the
atmosphere. [Imp.]
Ans. Air pressure is the pressure exerted by the weight of air on the
earth’s surface. As we go up the layers of the atmosphere, the pressure falls
rapidly. The air pressure is highest at the sea level and decreases with
height. Horizonally the distribution of air pressure is influenced by the
temperature of the air at a given place. In areas where the temperature is high
the air gets heated and rises. This creates a low-pressure area. In areas
having lower temperature, the air is cold, hence, it is heavy. Heavy air sinks
and creates a high-pressure area.
Q.6 Why do astronauts wear special protective suits when they go to the
moon?
Ans. Astronauts wear special protective space suits filled with air when
they go to the moon. If they did not wear these space suits, the counter
pressure exerted by the body of the astronauts would make the blood vessels
burst. The astronauts would bleed.
Q.7 How is rainfall important for us? What happens when there is excess
rain? [V. Imp.]
Ans. Rainfall is very important for the survival of plants and animals.
It brings fresh water to the earth’s surface. If rainfall is less, there is
water scarcity which sometimes causes drought like situation. If there is
excess rain, floods take place which makes the life of the affected people
miserable.
5. Which gas
is used by the green plants to make their food?
(a) Oxygen
(b) Carbon dioxide
(c) Nitrogen
(d) None of these
6. Which is
the important gas used by human beings for breathing?
(a) Nitrogen
(b) Carbon dioxide
(c) Oxygen
(d) Sodium chloride
7. When
the air is heated it becomes
(a) Lighter?
(b) Heavier?
(c) Colder?
(d) None of these
8. What is
the average height of the troposphere?
(a) 3 km
(b) 6 km
(c) 9 km
(d) 13 km
9. As we go
up in troposphere layer of the atmosphere the pressure
(a) increases
(b) decreases
(c) no change
(d) all of these
10. Which
one of the following gases protects us from harmful sun’s rays?
(a) Ozone
(b) Nitrogen
(c) Carbon dioxide
(d) Oxygen
11. Which of
the following are part of weather forecast in the newspapers?
(a) Temperature
(b) Humidity
(c) Time of Sunset
(d) All of These
12. Which element of weather is measured in degree
Celsius?
(a) Temperature
(b) Pressure
(c) Wind
(d) Gravity
13. The water boils at
(a) 10°C
(b) 50°C
(c) 75°C
(d) 100°C
14. Where is the air pressure highest?
(a) Moon
(b) Sea Level
(c) Stratosphere
(d) Exosphere
15. What is very hot wind called?
(a) Loo
(b) Cool breeze
(c) Monsoon air
(d) Trade wind
16. Which one of the following is a local wind?
(a) Sea breeze
(b) Trade wind
(c) Monsoon wind
(d) None of these
17. Rain, snow sleet or hail are the different
forms of:
(a) Condensation
(b) Evaporation
(c) Precipitation
(d) All of these
Fill in the blanks with appropriate words:1. Earth
is surrounded by a blanket of air called ……… ….
2. Green plants produce …………. during
photosynthesis.
3. Increased volume of ………….. is affecting the
earth’s weather and climate.
4. Ionosphere is the part of ……………
5. Amount of rainfall is measured by ………….
6. Insolation influences the distribution of …………….
State whether the given statements are true or
false.1. Hot
air is dense and heavy and cold air is lighter and expands.
2. Without Greenhouse effect earth would have been
too cold to live.
3. Ionosphere contains the ozone layer.
4. Helium and hydrogen float from exosphere into
space.
5. Wind-vane shows the direction of wind.
6. Air moves from high pressure to low pressure.
ANSWERSMCQS
1
2
3
4
5
6
7
8
9
10
A
B
D
C
A
C
A
D
B
A
11
12
13
14
15
16
17
D
A
D
B
A
A
C
FILL IN
THE BLANKS
1. Atmosphere,
2- Oxygen, 3-co2, 4-Thermosphere, 5- rainguage,, 6-Temprature
True/
false
1.False, 2- True,
3- False 4. True, 5- True, 6.-True
1. How does carbon dioxide
create green house effect?
Answer: Crbon dioxide creates greenhouse effect by trapping
the heat radiated from the earth.
2. What is the significance
of greenhouse gas?
Answer: Without the greenhouse gas the earth would have been
too cold to line in.
3. What happens when air is
heated?
Answer: When air is heated, it expands, becomes lighter and goes
up.
4. What is the nature of
cold air?
Ans. It has tendency to go down.
5. Why do green plants use
carbon dioxide? [Imp.]
Answer: Green plants use carbon dioxide to make their food
and release oxygen.
6. What is an important
feature of Stratosphere?
Answer: Stratosphere contains a layer of ozone gas.
7. How is ozone important
for us? [Imp.]
Answer: It protects us from the harmful effect of the sunrays.
8. What is temperature?
Answer: The degree of hotness and coldness of the air is known as
temperature.
9. What is insolation?
Answer: Insolation is the incoming solar energy intercepted
by the earth.
10. Why is there no air
pressure on the moon?
Answer: There is no air on the moon and therefore no air pressure.
11. Where is air pressure
highest?
Answer: Air pressure is highest at the sea level.
12. How does air move?
Answer: Air moves from high pressure areas to low pressure
areas.
13. Name three types of
winds.
Answer:
1.
Permanent winds
2.
Seasonal winds
3.
Local winds.
14. What is the hot
and dry wind of northern planes of India called?
Ans. It is called loo.
Q.15 What is called humidity? [V. Imp.]
Ans. Moisture in the air at any time is called humidity.
Q 16 Why do we feel uncomfortable on a humid day?
Ans. It is because sweat from our body does not evaporate easily.
Q.17 How is the flooding of low lying areas caused? [V. Imp.]
Ans. When trees on hill sides are cut, rainwater flows down the bare
mountains. This causes flooding of low lying areas.
Q.18 Name various forms of precipitation.
Ans.
1.
Rain
2.
Snow
3.
Sleet
4.
Hail
Q.19 How is a wind named?
Ans. A wind is named after the direction from which it
blows.
SHORT ANSWER TYPE QUESTIONS
Q.1 Give an account of the composition of the atmosphere. [V. Imp.]
Ans. Our atmosphere is composed of mainly two gases—nitrogen (78%)
and oxygen (21%). Other gases like carbon dioxide, helium, ozone, orgon and
hydrogen are found in lesser quantities. Apart from these gases, tiny dust
particles are also present in the air.
Q.2 How do Bacteria help plants use nitrogen? [V. Imp.]
Ans. Nitrogen is essential for the survival of the plant. But
plants cannot take nitrogen directly from the air. Bacteria, that live in the
soil and roots of some plants, take nitrogen from the air and change its form
so that plants can use it.
Q.3 How does nature balance our life? What is the result if this balance
is disturbed?[V. Imp.]
Ans. Green plants use carbon dioxide to make their food and release
oxygen. Humans or animals release carbon dioxide. The amount of carbon dioxide
released by humans or animals seems to be equal to the amount used by the
plants which make a perfect balance. But this balance is disturbed by the burning
of fuels, which add billions of tons of carbon dioxide in the atmosphere. As a
result, the increased volume of carbon dioxide is affecting the earth’s weather
and climate.
Q.4 Why is temperature in cities much higher than that of villages ?
Ans. In cities, we find high rise buildings. The concrete and metals in
these buildings and the asaphalt of roads get heated up during the day. This
heat is released during the night.
Another reason is that the crowded high rise buildings of the cities trap the
warm air and thus raise the temperature of the cities.
Q.5 Write a short note on the distribution of air pressure in the
atmosphere. [Imp.]
Ans. Air pressure is the pressure exerted by the weight of air on the
earth’s surface. As we go up the layers of the atmosphere, the pressure falls
rapidly. The air pressure is highest at the sea level and decreases with
height. Horizonally the distribution of air pressure is influenced by the
temperature of the air at a given place. In areas where the temperature is high
the air gets heated and rises. This creates a low-pressure area. In areas
having lower temperature, the air is cold, hence, it is heavy. Heavy air sinks
and creates a high-pressure area.
Q.6 Why do astronauts wear special protective suits when they go to the
moon?
Ans. Astronauts wear special protective space suits filled with air when
they go to the moon. If they did not wear these space suits, the counter
pressure exerted by the body of the astronauts would make the blood vessels
burst. The astronauts would bleed.
Q.7 How is rainfall important for us? What happens when there is excess
rain? [V. Imp.]
Ans. Rainfall is very important for the survival of plants and animals.
It brings fresh water to the earth’s surface. If rainfall is less, there is
water scarcity which sometimes causes drought like situation. If there is
excess rain, floods take place which makes the life of the affected people
miserable.
6. Which is
the important gas used by human beings for breathing?
(a) Nitrogen
(b) Carbon dioxide
(c) Oxygen
(d) Sodium chloride
7. When
the air is heated it becomes
(a) Lighter?
(b) Heavier?
(c) Colder?
(d) None of these
8. What is
the average height of the troposphere?
(a) 3 km
(b) 6 km
(c) 9 km
(d) 13 km
9. As we go
up in troposphere layer of the atmosphere the pressure
(a) increases
(b) decreases
(c) no change
(d) all of these
10. Which
one of the following gases protects us from harmful sun’s rays?
(a) Ozone
(b) Nitrogen
(c) Carbon dioxide
(d) Oxygen
11. Which of
the following are part of weather forecast in the newspapers?
(a) Temperature
(b) Humidity
(c) Time of Sunset
(d) All of These
12. Which element of weather is measured in degree
Celsius?
(a) Temperature
(b) Pressure
(c) Wind
(d) Gravity
13. The water boils at
(a) 10°C
(b) 50°C
(c) 75°C
(d) 100°C
14. Where is the air pressure highest?
(a) Moon
(b) Sea Level
(c) Stratosphere
(d) Exosphere
15. What is very hot wind called?
(a) Loo
(b) Cool breeze
(c) Monsoon air
(d) Trade wind
16. Which one of the following is a local wind?
(a) Sea breeze
(b) Trade wind
(c) Monsoon wind
(d) None of these
17. Rain, snow sleet or hail are the different
forms of:
(a) Condensation
(b) Evaporation
(c) Precipitation
(d) All of these
Fill in the blanks with appropriate words:1. Earth
is surrounded by a blanket of air called ……… ….
2. Green plants produce …………. during
photosynthesis.
3. Increased volume of ………….. is affecting the
earth’s weather and climate.
4. Ionosphere is the part of ……………
5. Amount of rainfall is measured by ………….
6. Insolation influences the distribution of …………….
State whether the given statements are true or
false.1. Hot
air is dense and heavy and cold air is lighter and expands.
2. Without Greenhouse effect earth would have been
too cold to live.
3. Ionosphere contains the ozone layer.
4. Helium and hydrogen float from exosphere into
space.
5. Wind-vane shows the direction of wind.
6. Air moves from high pressure to low pressure.
ANSWERSMCQS
1
2
3
4
5
6
7
8
9
10
A
B
D
C
A
C
A
D
B
A
11
12
13
14
15
16
17
D
A
D
B
A
A
C
FILL IN
THE BLANKS
1. Atmosphere,
2- Oxygen, 3-co2, 4-Thermosphere, 5- rainguage,, 6-Temprature
True/
false
1.False, 2- True,
3- False 4. True, 5- True, 6.-True
1. How does carbon dioxide
create green house effect?
Answer: Crbon dioxide creates greenhouse effect by trapping
the heat radiated from the earth.
2. What is the significance
of greenhouse gas?
Answer: Without the greenhouse gas the earth would have been
too cold to line in.
3. What happens when air is
heated?
Answer: When air is heated, it expands, becomes lighter and goes
up.
4. What is the nature of
cold air?
Ans. It has tendency to go down.
5. Why do green plants use
carbon dioxide? [Imp.]
Answer: Green plants use carbon dioxide to make their food
and release oxygen.
6. What is an important
feature of Stratosphere?
Answer: Stratosphere contains a layer of ozone gas.
7. How is ozone important
for us? [Imp.]
Answer: It protects us from the harmful effect of the sunrays.
8. What is temperature?
Answer: The degree of hotness and coldness of the air is known as
temperature.
9. What is insolation?
Answer: Insolation is the incoming solar energy intercepted
by the earth.
10. Why is there no air
pressure on the moon?
Answer: There is no air on the moon and therefore no air pressure.
11. Where is air pressure
highest?
Answer: Air pressure is highest at the sea level.
12. How does air move?
Answer: Air moves from high pressure areas to low pressure
areas.
13. Name three types of
winds.
Answer:
1.
Permanent winds
2.
Seasonal winds
3.
Local winds.
14. What is the hot
and dry wind of northern planes of India called?
Ans. It is called loo.
Q.15 What is called humidity? [V. Imp.]
Ans. Moisture in the air at any time is called humidity.
Q 16 Why do we feel uncomfortable on a humid day?
Ans. It is because sweat from our body does not evaporate easily.
Q.17 How is the flooding of low lying areas caused? [V. Imp.]
Ans. When trees on hill sides are cut, rainwater flows down the bare
mountains. This causes flooding of low lying areas.
Q.18 Name various forms of precipitation.
Ans.
1.
Rain
2.
Snow
3.
Sleet
4.
Hail
Q.19 How is a wind named?
Ans. A wind is named after the direction from which it
blows.
SHORT ANSWER TYPE QUESTIONS
Q.1 Give an account of the composition of the atmosphere. [V. Imp.]
Ans. Our atmosphere is composed of mainly two gases—nitrogen (78%)
and oxygen (21%). Other gases like carbon dioxide, helium, ozone, orgon and
hydrogen are found in lesser quantities. Apart from these gases, tiny dust
particles are also present in the air.
Q.2 How do Bacteria help plants use nitrogen? [V. Imp.]
Ans. Nitrogen is essential for the survival of the plant. But
plants cannot take nitrogen directly from the air. Bacteria, that live in the
soil and roots of some plants, take nitrogen from the air and change its form
so that plants can use it.
Q.3 How does nature balance our life? What is the result if this balance
is disturbed?[V. Imp.]
Ans. Green plants use carbon dioxide to make their food and release
oxygen. Humans or animals release carbon dioxide. The amount of carbon dioxide
released by humans or animals seems to be equal to the amount used by the
plants which make a perfect balance. But this balance is disturbed by the burning
of fuels, which add billions of tons of carbon dioxide in the atmosphere. As a
result, the increased volume of carbon dioxide is affecting the earth’s weather
and climate.
Q.4 Why is temperature in cities much higher than that of villages ?
Ans. In cities, we find high rise buildings. The concrete and metals in
these buildings and the asaphalt of roads get heated up during the day. This
heat is released during the night.
Another reason is that the crowded high rise buildings of the cities trap the
warm air and thus raise the temperature of the cities.
Q.5 Write a short note on the distribution of air pressure in the
atmosphere. [Imp.]
Ans. Air pressure is the pressure exerted by the weight of air on the
earth’s surface. As we go up the layers of the atmosphere, the pressure falls
rapidly. The air pressure is highest at the sea level and decreases with
height. Horizonally the distribution of air pressure is influenced by the
temperature of the air at a given place. In areas where the temperature is high
the air gets heated and rises. This creates a low-pressure area. In areas
having lower temperature, the air is cold, hence, it is heavy. Heavy air sinks
and creates a high-pressure area.
Q.6 Why do astronauts wear special protective suits when they go to the
moon?
Ans. Astronauts wear special protective space suits filled with air when
they go to the moon. If they did not wear these space suits, the counter
pressure exerted by the body of the astronauts would make the blood vessels
burst. The astronauts would bleed.
Q.7 How is rainfall important for us? What happens when there is excess
rain? [V. Imp.]
Ans. Rainfall is very important for the survival of plants and animals.
It brings fresh water to the earth’s surface. If rainfall is less, there is
water scarcity which sometimes causes drought like situation. If there is
excess rain, floods take place which makes the life of the affected people
miserable.
7. When
the air is heated it becomes
(a) Lighter?
(b) Heavier?
(c) Colder?
(d) None of these
8. What is
the average height of the troposphere?
(a) 3 km
(b) 6 km
(c) 9 km
(d) 13 km
9. As we go
up in troposphere layer of the atmosphere the pressure
(a) increases
(b) decreases
(c) no change
(d) all of these
10. Which
one of the following gases protects us from harmful sun’s rays?
(a) Ozone
(b) Nitrogen
(c) Carbon dioxide
(d) Oxygen
11. Which of
the following are part of weather forecast in the newspapers?
(a) Temperature
(b) Humidity
(c) Time of Sunset
(d) All of These
12. Which element of weather is measured in degree
Celsius?
(a) Temperature
(b) Pressure
(c) Wind
(d) Gravity
13. The water boils at
(a) 10°C
(b) 50°C
(c) 75°C
(d) 100°C
14. Where is the air pressure highest?
(a) Moon
(b) Sea Level
(c) Stratosphere
(d) Exosphere
15. What is very hot wind called?
(a) Loo
(b) Cool breeze
(c) Monsoon air
(d) Trade wind
16. Which one of the following is a local wind?
(a) Sea breeze
(b) Trade wind
(c) Monsoon wind
(d) None of these
17. Rain, snow sleet or hail are the different
forms of:
(a) Condensation
(b) Evaporation
(c) Precipitation
(d) All of these
Fill in the blanks with appropriate words:1. Earth
is surrounded by a blanket of air called ……… ….
2. Green plants produce …………. during
photosynthesis.
3. Increased volume of ………….. is affecting the
earth’s weather and climate.
4. Ionosphere is the part of ……………
5. Amount of rainfall is measured by ………….
6. Insolation influences the distribution of …………….
State whether the given statements are true or
false.1. Hot
air is dense and heavy and cold air is lighter and expands.
2. Without Greenhouse effect earth would have been
too cold to live.
3. Ionosphere contains the ozone layer.
4. Helium and hydrogen float from exosphere into
space.
5. Wind-vane shows the direction of wind.
6. Air moves from high pressure to low pressure.
ANSWERSMCQS
1
2
3
4
5
6
7
8
9
10
A
B
D
C
A
C
A
D
B
A
11
12
13
14
15
16
17
D
A
D
B
A
A
C
FILL IN
THE BLANKS
1. Atmosphere,
2- Oxygen, 3-co2, 4-Thermosphere, 5- rainguage,, 6-Temprature
True/
false
1.False, 2- True,
3- False 4. True, 5- True, 6.-True
1. How does carbon dioxide
create green house effect?
Answer: Crbon dioxide creates greenhouse effect by trapping
the heat radiated from the earth.
2. What is the significance
of greenhouse gas?
Answer: Without the greenhouse gas the earth would have been
too cold to line in.
3. What happens when air is
heated?
Answer: When air is heated, it expands, becomes lighter and goes
up.
4. What is the nature of
cold air?
Ans. It has tendency to go down.
5. Why do green plants use
carbon dioxide? [Imp.]
Answer: Green plants use carbon dioxide to make their food
and release oxygen.
6. What is an important
feature of Stratosphere?
Answer: Stratosphere contains a layer of ozone gas.
7. How is ozone important
for us? [Imp.]
Answer: It protects us from the harmful effect of the sunrays.
8. What is temperature?
Answer: The degree of hotness and coldness of the air is known as
temperature.
9. What is insolation?
Answer: Insolation is the incoming solar energy intercepted
by the earth.
10. Why is there no air
pressure on the moon?
Answer: There is no air on the moon and therefore no air pressure.
11. Where is air pressure
highest?
Answer: Air pressure is highest at the sea level.
12. How does air move?
Answer: Air moves from high pressure areas to low pressure
areas.
13. Name three types of
winds.
Answer:
1.
Permanent winds
2.
Seasonal winds
3.
Local winds.
14. What is the hot
and dry wind of northern planes of India called?
Ans. It is called loo.
Q.15 What is called humidity? [V. Imp.]
Ans. Moisture in the air at any time is called humidity.
Q 16 Why do we feel uncomfortable on a humid day?
Ans. It is because sweat from our body does not evaporate easily.
Q.17 How is the flooding of low lying areas caused? [V. Imp.]
Ans. When trees on hill sides are cut, rainwater flows down the bare
mountains. This causes flooding of low lying areas.
Q.18 Name various forms of precipitation.
Ans.
1.
Rain
2.
Snow
3.
Sleet
4.
Hail
Q.19 How is a wind named?
Ans. A wind is named after the direction from which it
blows.
SHORT ANSWER TYPE QUESTIONS
Q.1 Give an account of the composition of the atmosphere. [V. Imp.]
Ans. Our atmosphere is composed of mainly two gases—nitrogen (78%)
and oxygen (21%). Other gases like carbon dioxide, helium, ozone, orgon and
hydrogen are found in lesser quantities. Apart from these gases, tiny dust
particles are also present in the air.
Q.2 How do Bacteria help plants use nitrogen? [V. Imp.]
Ans. Nitrogen is essential for the survival of the plant. But
plants cannot take nitrogen directly from the air. Bacteria, that live in the
soil and roots of some plants, take nitrogen from the air and change its form
so that plants can use it.
Q.3 How does nature balance our life? What is the result if this balance
is disturbed?[V. Imp.]
Ans. Green plants use carbon dioxide to make their food and release
oxygen. Humans or animals release carbon dioxide. The amount of carbon dioxide
released by humans or animals seems to be equal to the amount used by the
plants which make a perfect balance. But this balance is disturbed by the burning
of fuels, which add billions of tons of carbon dioxide in the atmosphere. As a
result, the increased volume of carbon dioxide is affecting the earth’s weather
and climate.
Q.4 Why is temperature in cities much higher than that of villages ?
Ans. In cities, we find high rise buildings. The concrete and metals in
these buildings and the asaphalt of roads get heated up during the day. This
heat is released during the night.
Another reason is that the crowded high rise buildings of the cities trap the
warm air and thus raise the temperature of the cities.
Q.5 Write a short note on the distribution of air pressure in the
atmosphere. [Imp.]
Ans. Air pressure is the pressure exerted by the weight of air on the
earth’s surface. As we go up the layers of the atmosphere, the pressure falls
rapidly. The air pressure is highest at the sea level and decreases with
height. Horizonally the distribution of air pressure is influenced by the
temperature of the air at a given place. In areas where the temperature is high
the air gets heated and rises. This creates a low-pressure area. In areas
having lower temperature, the air is cold, hence, it is heavy. Heavy air sinks
and creates a high-pressure area.
Q.6 Why do astronauts wear special protective suits when they go to the
moon?
Ans. Astronauts wear special protective space suits filled with air when
they go to the moon. If they did not wear these space suits, the counter
pressure exerted by the body of the astronauts would make the blood vessels
burst. The astronauts would bleed.
Q.7 How is rainfall important for us? What happens when there is excess
rain? [V. Imp.]
Ans. Rainfall is very important for the survival of plants and animals.
It brings fresh water to the earth’s surface. If rainfall is less, there is
water scarcity which sometimes causes drought like situation. If there is
excess rain, floods take place which makes the life of the affected people
miserable.
8. What is
the average height of the troposphere?
(a) 3 km
(b) 6 km
(c) 9 km
(d) 13 km
9. As we go
up in troposphere layer of the atmosphere the pressure
(a) increases
(b) decreases
(c) no change
(d) all of these
10. Which
one of the following gases protects us from harmful sun’s rays?
(a) Ozone
(b) Nitrogen
(c) Carbon dioxide
(d) Oxygen
11. Which of
the following are part of weather forecast in the newspapers?
(a) Temperature
(b) Humidity
(c) Time of Sunset
(d) All of These
12. Which element of weather is measured in degree
Celsius?
(a) Temperature
(b) Pressure
(c) Wind
(d) Gravity
13. The water boils at
(a) 10°C
(b) 50°C
(c) 75°C
(d) 100°C
14. Where is the air pressure highest?
(a) Moon
(b) Sea Level
(c) Stratosphere
(d) Exosphere
15. What is very hot wind called?
(a) Loo
(b) Cool breeze
(c) Monsoon air
(d) Trade wind
16. Which one of the following is a local wind?
(a) Sea breeze
(b) Trade wind
(c) Monsoon wind
(d) None of these
17. Rain, snow sleet or hail are the different
forms of:
(a) Condensation
(b) Evaporation
(c) Precipitation
(d) All of these
Fill in the blanks with appropriate words:1. Earth
is surrounded by a blanket of air called ……… ….
2. Green plants produce …………. during
photosynthesis.
3. Increased volume of ………….. is affecting the
earth’s weather and climate.
4. Ionosphere is the part of ……………
5. Amount of rainfall is measured by ………….
6. Insolation influences the distribution of …………….
State whether the given statements are true or
false.1. Hot
air is dense and heavy and cold air is lighter and expands.
2. Without Greenhouse effect earth would have been
too cold to live.
3. Ionosphere contains the ozone layer.
4. Helium and hydrogen float from exosphere into
space.
5. Wind-vane shows the direction of wind.
6. Air moves from high pressure to low pressure.
ANSWERSMCQS
1
2
3
4
5
6
7
8
9
10
A
B
D
C
A
C
A
D
B
A
11
12
13
14
15
16
17
D
A
D
B
A
A
C
FILL IN
THE BLANKS
1. Atmosphere,
2- Oxygen, 3-co2, 4-Thermosphere, 5- rainguage,, 6-Temprature
True/
false
1.False, 2- True,
3- False 4. True, 5- True, 6.-True
1. How does carbon dioxide
create green house effect?
Answer: Crbon dioxide creates greenhouse effect by trapping
the heat radiated from the earth.
2. What is the significance
of greenhouse gas?
Answer: Without the greenhouse gas the earth would have been
too cold to line in.
3. What happens when air is
heated?
Answer: When air is heated, it expands, becomes lighter and goes
up.
4. What is the nature of
cold air?
Ans. It has tendency to go down.
5. Why do green plants use
carbon dioxide? [Imp.]
Answer: Green plants use carbon dioxide to make their food
and release oxygen.
6. What is an important
feature of Stratosphere?
Answer: Stratosphere contains a layer of ozone gas.
7. How is ozone important
for us? [Imp.]
Answer: It protects us from the harmful effect of the sunrays.
8. What is temperature?
Answer: The degree of hotness and coldness of the air is known as
temperature.
9. What is insolation?
Answer: Insolation is the incoming solar energy intercepted
by the earth.
10. Why is there no air
pressure on the moon?
Answer: There is no air on the moon and therefore no air pressure.
11. Where is air pressure
highest?
Answer: Air pressure is highest at the sea level.
12. How does air move?
Answer: Air moves from high pressure areas to low pressure
areas.
13. Name three types of
winds.
Answer:
1.
Permanent winds
2.
Seasonal winds
3.
Local winds.
14. What is the hot
and dry wind of northern planes of India called?
Ans. It is called loo.
Q.15 What is called humidity? [V. Imp.]
Ans. Moisture in the air at any time is called humidity.
Q 16 Why do we feel uncomfortable on a humid day?
Ans. It is because sweat from our body does not evaporate easily.
Q.17 How is the flooding of low lying areas caused? [V. Imp.]
Ans. When trees on hill sides are cut, rainwater flows down the bare
mountains. This causes flooding of low lying areas.
Q.18 Name various forms of precipitation.
Ans.
1.
Rain
2.
Snow
3.
Sleet
4.
Hail
Q.19 How is a wind named?
Ans. A wind is named after the direction from which it
blows.
SHORT ANSWER TYPE QUESTIONS
Q.1 Give an account of the composition of the atmosphere. [V. Imp.]
Ans. Our atmosphere is composed of mainly two gases—nitrogen (78%)
and oxygen (21%). Other gases like carbon dioxide, helium, ozone, orgon and
hydrogen are found in lesser quantities. Apart from these gases, tiny dust
particles are also present in the air.
Q.2 How do Bacteria help plants use nitrogen? [V. Imp.]
Ans. Nitrogen is essential for the survival of the plant. But
plants cannot take nitrogen directly from the air. Bacteria, that live in the
soil and roots of some plants, take nitrogen from the air and change its form
so that plants can use it.
Q.3 How does nature balance our life? What is the result if this balance
is disturbed?[V. Imp.]
Ans. Green plants use carbon dioxide to make their food and release
oxygen. Humans or animals release carbon dioxide. The amount of carbon dioxide
released by humans or animals seems to be equal to the amount used by the
plants which make a perfect balance. But this balance is disturbed by the burning
of fuels, which add billions of tons of carbon dioxide in the atmosphere. As a
result, the increased volume of carbon dioxide is affecting the earth’s weather
and climate.
Q.4 Why is temperature in cities much higher than that of villages ?
Ans. In cities, we find high rise buildings. The concrete and metals in
these buildings and the asaphalt of roads get heated up during the day. This
heat is released during the night.
Another reason is that the crowded high rise buildings of the cities trap the
warm air and thus raise the temperature of the cities.
Q.5 Write a short note on the distribution of air pressure in the
atmosphere. [Imp.]
Ans. Air pressure is the pressure exerted by the weight of air on the
earth’s surface. As we go up the layers of the atmosphere, the pressure falls
rapidly. The air pressure is highest at the sea level and decreases with
height. Horizonally the distribution of air pressure is influenced by the
temperature of the air at a given place. In areas where the temperature is high
the air gets heated and rises. This creates a low-pressure area. In areas
having lower temperature, the air is cold, hence, it is heavy. Heavy air sinks
and creates a high-pressure area.
Q.6 Why do astronauts wear special protective suits when they go to the
moon?
Ans. Astronauts wear special protective space suits filled with air when
they go to the moon. If they did not wear these space suits, the counter
pressure exerted by the body of the astronauts would make the blood vessels
burst. The astronauts would bleed.
Q.7 How is rainfall important for us? What happens when there is excess
rain? [V. Imp.]
Ans. Rainfall is very important for the survival of plants and animals.
It brings fresh water to the earth’s surface. If rainfall is less, there is
water scarcity which sometimes causes drought like situation. If there is
excess rain, floods take place which makes the life of the affected people
miserable.
9. As we go
up in troposphere layer of the atmosphere the pressure
(a) increases
(b) decreases
(c) no change
(d) all of these
10. Which
one of the following gases protects us from harmful sun’s rays?
(a) Ozone
(b) Nitrogen
(c) Carbon dioxide
(d) Oxygen
11. Which of
the following are part of weather forecast in the newspapers?
(a) Temperature
(b) Humidity
(c) Time of Sunset
(d) All of These
12. Which element of weather is measured in degree
Celsius?
(a) Temperature
(b) Pressure
(c) Wind
(d) Gravity
13. The water boils at
(a) 10°C
(b) 50°C
(c) 75°C
(d) 100°C
14. Where is the air pressure highest?
(a) Moon
(b) Sea Level
(c) Stratosphere
(d) Exosphere
15. What is very hot wind called?
(a) Loo
(b) Cool breeze
(c) Monsoon air
(d) Trade wind
16. Which one of the following is a local wind?
(a) Sea breeze
(b) Trade wind
(c) Monsoon wind
(d) None of these
17. Rain, snow sleet or hail are the different
forms of:
(a) Condensation
(b) Evaporation
(c) Precipitation
(d) All of these
Fill in the blanks with appropriate words:1. Earth
is surrounded by a blanket of air called ……… ….
2. Green plants produce …………. during
photosynthesis.
3. Increased volume of ………….. is affecting the
earth’s weather and climate.
4. Ionosphere is the part of ……………
5. Amount of rainfall is measured by ………….
6. Insolation influences the distribution of …………….
State whether the given statements are true or
false.1. Hot
air is dense and heavy and cold air is lighter and expands.
2. Without Greenhouse effect earth would have been
too cold to live.
3. Ionosphere contains the ozone layer.
4. Helium and hydrogen float from exosphere into
space.
5. Wind-vane shows the direction of wind.
6. Air moves from high pressure to low pressure.
ANSWERSMCQS
1
2
3
4
5
6
7
8
9
10
A
B
D
C
A
C
A
D
B
A
11
12
13
14
15
16
17
D
A
D
B
A
A
C
FILL IN
THE BLANKS
1. Atmosphere,
2- Oxygen, 3-co2, 4-Thermosphere, 5- rainguage,, 6-Temprature
True/
false
1.False, 2- True,
3- False 4. True, 5- True, 6.-True
1. How does carbon dioxide
create green house effect?
Answer: Crbon dioxide creates greenhouse effect by trapping
the heat radiated from the earth.
2. What is the significance
of greenhouse gas?
Answer: Without the greenhouse gas the earth would have been
too cold to line in.
3. What happens when air is
heated?
Answer: When air is heated, it expands, becomes lighter and goes
up.
4. What is the nature of
cold air?
Ans. It has tendency to go down.
5. Why do green plants use
carbon dioxide? [Imp.]
Answer: Green plants use carbon dioxide to make their food
and release oxygen.
6. What is an important
feature of Stratosphere?
Answer: Stratosphere contains a layer of ozone gas.
7. How is ozone important
for us? [Imp.]
Answer: It protects us from the harmful effect of the sunrays.
8. What is temperature?
Answer: The degree of hotness and coldness of the air is known as
temperature.
9. What is insolation?
Answer: Insolation is the incoming solar energy intercepted
by the earth.
10. Why is there no air
pressure on the moon?
Answer: There is no air on the moon and therefore no air pressure.
11. Where is air pressure
highest?
Answer: Air pressure is highest at the sea level.
12. How does air move?
Answer: Air moves from high pressure areas to low pressure
areas.
13. Name three types of
winds.
Answer:
1.
Permanent winds
2.
Seasonal winds
3.
Local winds.
14. What is the hot
and dry wind of northern planes of India called?
Ans. It is called loo.
Q.15 What is called humidity? [V. Imp.]
Ans. Moisture in the air at any time is called humidity.
Q 16 Why do we feel uncomfortable on a humid day?
Ans. It is because sweat from our body does not evaporate easily.
Q.17 How is the flooding of low lying areas caused? [V. Imp.]
Ans. When trees on hill sides are cut, rainwater flows down the bare
mountains. This causes flooding of low lying areas.
Q.18 Name various forms of precipitation.
Ans.
1.
Rain
2.
Snow
3.
Sleet
4.
Hail
Q.19 How is a wind named?
Ans. A wind is named after the direction from which it
blows.
SHORT ANSWER TYPE QUESTIONS
Q.1 Give an account of the composition of the atmosphere. [V. Imp.]
Ans. Our atmosphere is composed of mainly two gases—nitrogen (78%)
and oxygen (21%). Other gases like carbon dioxide, helium, ozone, orgon and
hydrogen are found in lesser quantities. Apart from these gases, tiny dust
particles are also present in the air.
Q.2 How do Bacteria help plants use nitrogen? [V. Imp.]
Ans. Nitrogen is essential for the survival of the plant. But
plants cannot take nitrogen directly from the air. Bacteria, that live in the
soil and roots of some plants, take nitrogen from the air and change its form
so that plants can use it.
Q.3 How does nature balance our life? What is the result if this balance
is disturbed?[V. Imp.]
Ans. Green plants use carbon dioxide to make their food and release
oxygen. Humans or animals release carbon dioxide. The amount of carbon dioxide
released by humans or animals seems to be equal to the amount used by the
plants which make a perfect balance. But this balance is disturbed by the burning
of fuels, which add billions of tons of carbon dioxide in the atmosphere. As a
result, the increased volume of carbon dioxide is affecting the earth’s weather
and climate.
Q.4 Why is temperature in cities much higher than that of villages ?
Ans. In cities, we find high rise buildings. The concrete and metals in
these buildings and the asaphalt of roads get heated up during the day. This
heat is released during the night.
Another reason is that the crowded high rise buildings of the cities trap the
warm air and thus raise the temperature of the cities.
Q.5 Write a short note on the distribution of air pressure in the
atmosphere. [Imp.]
Ans. Air pressure is the pressure exerted by the weight of air on the
earth’s surface. As we go up the layers of the atmosphere, the pressure falls
rapidly. The air pressure is highest at the sea level and decreases with
height. Horizonally the distribution of air pressure is influenced by the
temperature of the air at a given place. In areas where the temperature is high
the air gets heated and rises. This creates a low-pressure area. In areas
having lower temperature, the air is cold, hence, it is heavy. Heavy air sinks
and creates a high-pressure area.
Q.6 Why do astronauts wear special protective suits when they go to the
moon?
Ans. Astronauts wear special protective space suits filled with air when
they go to the moon. If they did not wear these space suits, the counter
pressure exerted by the body of the astronauts would make the blood vessels
burst. The astronauts would bleed.
Q.7 How is rainfall important for us? What happens when there is excess
rain? [V. Imp.]
Ans. Rainfall is very important for the survival of plants and animals.
It brings fresh water to the earth’s surface. If rainfall is less, there is
water scarcity which sometimes causes drought like situation. If there is
excess rain, floods take place which makes the life of the affected people
miserable.
10. Which
one of the following gases protects us from harmful sun’s rays?
(a) Ozone
(b) Nitrogen
(c) Carbon dioxide
(d) Oxygen
11. Which of
the following are part of weather forecast in the newspapers?
(a) Temperature
(b) Humidity
(c) Time of Sunset
(d) All of These
12. Which element of weather is measured in degree
Celsius?
(a) Temperature
(b) Pressure
(c) Wind
(d) Gravity
13. The water boils at
(a) 10°C
(b) 50°C
(c) 75°C
(d) 100°C
14. Where is the air pressure highest?
(a) Moon
(b) Sea Level
(c) Stratosphere
(d) Exosphere
15. What is very hot wind called?
(a) Loo
(b) Cool breeze
(c) Monsoon air
(d) Trade wind
16. Which one of the following is a local wind?
(a) Sea breeze
(b) Trade wind
(c) Monsoon wind
(d) None of these
17. Rain, snow sleet or hail are the different
forms of:
(a) Condensation
(b) Evaporation
(c) Precipitation
(d) All of these
Fill in the blanks with appropriate words:1. Earth
is surrounded by a blanket of air called ……… ….
2. Green plants produce …………. during
photosynthesis.
3. Increased volume of ………….. is affecting the
earth’s weather and climate.
4. Ionosphere is the part of ……………
5. Amount of rainfall is measured by ………….
6. Insolation influences the distribution of …………….
State whether the given statements are true or
false.1. Hot
air is dense and heavy and cold air is lighter and expands.
2. Without Greenhouse effect earth would have been
too cold to live.
3. Ionosphere contains the ozone layer.
4. Helium and hydrogen float from exosphere into
space.
5. Wind-vane shows the direction of wind.
6. Air moves from high pressure to low pressure.
ANSWERSMCQS
1
2
3
4
5
6
7
8
9
10
A
B
D
C
A
C
A
D
B
A
11
12
13
14
15
16
17
D
A
D
B
A
A
C
FILL IN
THE BLANKS
1. Atmosphere,
2- Oxygen, 3-co2, 4-Thermosphere, 5- rainguage,, 6-Temprature
True/
false
1.False, 2- True,
3- False 4. True, 5- True, 6.-True
1. How does carbon dioxide
create green house effect?
Answer: Crbon dioxide creates greenhouse effect by trapping
the heat radiated from the earth.
2. What is the significance
of greenhouse gas?
Answer: Without the greenhouse gas the earth would have been
too cold to line in.
3. What happens when air is
heated?
Answer: When air is heated, it expands, becomes lighter and goes
up.
4. What is the nature of
cold air?
Ans. It has tendency to go down.
5. Why do green plants use
carbon dioxide? [Imp.]
Answer: Green plants use carbon dioxide to make their food
and release oxygen.
6. What is an important
feature of Stratosphere?
Answer: Stratosphere contains a layer of ozone gas.
7. How is ozone important
for us? [Imp.]
Answer: It protects us from the harmful effect of the sunrays.
8. What is temperature?
Answer: The degree of hotness and coldness of the air is known as
temperature.
9. What is insolation?
Answer: Insolation is the incoming solar energy intercepted
by the earth.
10. Why is there no air
pressure on the moon?
Answer: There is no air on the moon and therefore no air pressure.
11. Where is air pressure
highest?
Answer: Air pressure is highest at the sea level.
12. How does air move?
Answer: Air moves from high pressure areas to low pressure
areas.
13. Name three types of
winds.
Answer:
1.
Permanent winds
2.
Seasonal winds
3.
Local winds.
14. What is the hot
and dry wind of northern planes of India called?
Ans. It is called loo.
Q.15 What is called humidity? [V. Imp.]
Ans. Moisture in the air at any time is called humidity.
Q 16 Why do we feel uncomfortable on a humid day?
Ans. It is because sweat from our body does not evaporate easily.
Q.17 How is the flooding of low lying areas caused? [V. Imp.]
Ans. When trees on hill sides are cut, rainwater flows down the bare
mountains. This causes flooding of low lying areas.
Q.18 Name various forms of precipitation.
Ans.
1.
Rain
2.
Snow
3.
Sleet
4.
Hail
Q.19 How is a wind named?
Ans. A wind is named after the direction from which it
blows.
SHORT ANSWER TYPE QUESTIONS
Q.1 Give an account of the composition of the atmosphere. [V. Imp.]
Ans. Our atmosphere is composed of mainly two gases—nitrogen (78%)
and oxygen (21%). Other gases like carbon dioxide, helium, ozone, orgon and
hydrogen are found in lesser quantities. Apart from these gases, tiny dust
particles are also present in the air.
Q.2 How do Bacteria help plants use nitrogen? [V. Imp.]
Ans. Nitrogen is essential for the survival of the plant. But
plants cannot take nitrogen directly from the air. Bacteria, that live in the
soil and roots of some plants, take nitrogen from the air and change its form
so that plants can use it.
Q.3 How does nature balance our life? What is the result if this balance
is disturbed?[V. Imp.]
Ans. Green plants use carbon dioxide to make their food and release
oxygen. Humans or animals release carbon dioxide. The amount of carbon dioxide
released by humans or animals seems to be equal to the amount used by the
plants which make a perfect balance. But this balance is disturbed by the burning
of fuels, which add billions of tons of carbon dioxide in the atmosphere. As a
result, the increased volume of carbon dioxide is affecting the earth’s weather
and climate.
Q.4 Why is temperature in cities much higher than that of villages ?
Ans. In cities, we find high rise buildings. The concrete and metals in
these buildings and the asaphalt of roads get heated up during the day. This
heat is released during the night.
Another reason is that the crowded high rise buildings of the cities trap the
warm air and thus raise the temperature of the cities.
Q.5 Write a short note on the distribution of air pressure in the
atmosphere. [Imp.]
Ans. Air pressure is the pressure exerted by the weight of air on the
earth’s surface. As we go up the layers of the atmosphere, the pressure falls
rapidly. The air pressure is highest at the sea level and decreases with
height. Horizonally the distribution of air pressure is influenced by the
temperature of the air at a given place. In areas where the temperature is high
the air gets heated and rises. This creates a low-pressure area. In areas
having lower temperature, the air is cold, hence, it is heavy. Heavy air sinks
and creates a high-pressure area.
Q.6 Why do astronauts wear special protective suits when they go to the
moon?
Ans. Astronauts wear special protective space suits filled with air when
they go to the moon. If they did not wear these space suits, the counter
pressure exerted by the body of the astronauts would make the blood vessels
burst. The astronauts would bleed.
Q.7 How is rainfall important for us? What happens when there is excess
rain? [V. Imp.]
Ans. Rainfall is very important for the survival of plants and animals.
It brings fresh water to the earth’s surface. If rainfall is less, there is
water scarcity which sometimes causes drought like situation. If there is
excess rain, floods take place which makes the life of the affected people
miserable.
11. Which of
the following are part of weather forecast in the newspapers?
(a) Temperature
(b) Humidity
(c) Time of Sunset
(d) All of These
12. Which element of weather is measured in degree
Celsius?
(a) Temperature
(b) Pressure
(c) Wind
(d) Gravity
13. The water boils at
(a) 10°C
(b) 50°C
(c) 75°C
(d) 100°C
14. Where is the air pressure highest?
(a) Moon
(b) Sea Level
(c) Stratosphere
(d) Exosphere
15. What is very hot wind called?
(a) Loo
(b) Cool breeze
(c) Monsoon air
(d) Trade wind
16. Which one of the following is a local wind?
(a) Sea breeze
(b) Trade wind
(c) Monsoon wind
(d) None of these
17. Rain, snow sleet or hail are the different
forms of:
(a) Condensation
(b) Evaporation
(c) Precipitation
(d) All of these
Fill in the blanks with appropriate words:1. Earth
is surrounded by a blanket of air called ……… ….
2. Green plants produce …………. during
photosynthesis.
3. Increased volume of ………….. is affecting the
earth’s weather and climate.
4. Ionosphere is the part of ……………
5. Amount of rainfall is measured by ………….
6. Insolation influences the distribution of …………….
State whether the given statements are true or
false.1. Hot
air is dense and heavy and cold air is lighter and expands.
2. Without Greenhouse effect earth would have been
too cold to live.
3. Ionosphere contains the ozone layer.
4. Helium and hydrogen float from exosphere into
space.
5. Wind-vane shows the direction of wind.
6. Air moves from high pressure to low pressure.
ANSWERSMCQS
1
2
3
4
5
6
7
8
9
10
A
B
D
C
A
C
A
D
B
A
11
12
13
14
15
16
17
D
A
D
B
A
A
C
FILL IN
THE BLANKS
1. Atmosphere,
2- Oxygen, 3-co2, 4-Thermosphere, 5- rainguage,, 6-Temprature
True/
false
1.False, 2- True,
3- False 4. True, 5- True, 6.-True
1. How does carbon dioxide
create green house effect?
Answer: Crbon dioxide creates greenhouse effect by trapping
the heat radiated from the earth.
2. What is the significance
of greenhouse gas?
Answer: Without the greenhouse gas the earth would have been
too cold to line in.
3. What happens when air is
heated?
Answer: When air is heated, it expands, becomes lighter and goes
up.
4. What is the nature of
cold air?
Ans. It has tendency to go down.
5. Why do green plants use
carbon dioxide? [Imp.]
Answer: Green plants use carbon dioxide to make their food
and release oxygen.
6. What is an important
feature of Stratosphere?
Answer: Stratosphere contains a layer of ozone gas.
7. How is ozone important
for us? [Imp.]
Answer: It protects us from the harmful effect of the sunrays.
8. What is temperature?
Answer: The degree of hotness and coldness of the air is known as
temperature.
9. What is insolation?
Answer: Insolation is the incoming solar energy intercepted
by the earth.
10. Why is there no air
pressure on the moon?
Answer: There is no air on the moon and therefore no air pressure.
11. Where is air pressure
highest?
Answer: Air pressure is highest at the sea level.
12. How does air move?
Answer: Air moves from high pressure areas to low pressure
areas.
13. Name three types of
winds.
Answer:
1.
Permanent winds
2.
Seasonal winds
3.
Local winds.
14. What is the hot
and dry wind of northern planes of India called?
Ans. It is called loo.
Q.15 What is called humidity? [V. Imp.]
Ans. Moisture in the air at any time is called humidity.
Q 16 Why do we feel uncomfortable on a humid day?
Ans. It is because sweat from our body does not evaporate easily.
Q.17 How is the flooding of low lying areas caused? [V. Imp.]
Ans. When trees on hill sides are cut, rainwater flows down the bare
mountains. This causes flooding of low lying areas.
Q.18 Name various forms of precipitation.
Ans.
1.
Rain
2.
Snow
3.
Sleet
4.
Hail
Q.19 How is a wind named?
Ans. A wind is named after the direction from which it
blows.
SHORT ANSWER TYPE QUESTIONS
Q.1 Give an account of the composition of the atmosphere. [V. Imp.]
Ans. Our atmosphere is composed of mainly two gases—nitrogen (78%)
and oxygen (21%). Other gases like carbon dioxide, helium, ozone, orgon and
hydrogen are found in lesser quantities. Apart from these gases, tiny dust
particles are also present in the air.
Q.2 How do Bacteria help plants use nitrogen? [V. Imp.]
Ans. Nitrogen is essential for the survival of the plant. But
plants cannot take nitrogen directly from the air. Bacteria, that live in the
soil and roots of some plants, take nitrogen from the air and change its form
so that plants can use it.
Q.3 How does nature balance our life? What is the result if this balance
is disturbed?[V. Imp.]
Ans. Green plants use carbon dioxide to make their food and release
oxygen. Humans or animals release carbon dioxide. The amount of carbon dioxide
released by humans or animals seems to be equal to the amount used by the
plants which make a perfect balance. But this balance is disturbed by the burning
of fuels, which add billions of tons of carbon dioxide in the atmosphere. As a
result, the increased volume of carbon dioxide is affecting the earth’s weather
and climate.
Q.4 Why is temperature in cities much higher than that of villages ?
Ans. In cities, we find high rise buildings. The concrete and metals in
these buildings and the asaphalt of roads get heated up during the day. This
heat is released during the night.
Another reason is that the crowded high rise buildings of the cities trap the
warm air and thus raise the temperature of the cities.
Q.5 Write a short note on the distribution of air pressure in the
atmosphere. [Imp.]
Ans. Air pressure is the pressure exerted by the weight of air on the
earth’s surface. As we go up the layers of the atmosphere, the pressure falls
rapidly. The air pressure is highest at the sea level and decreases with
height. Horizonally the distribution of air pressure is influenced by the
temperature of the air at a given place. In areas where the temperature is high
the air gets heated and rises. This creates a low-pressure area. In areas
having lower temperature, the air is cold, hence, it is heavy. Heavy air sinks
and creates a high-pressure area.
Q.6 Why do astronauts wear special protective suits when they go to the
moon?
Ans. Astronauts wear special protective space suits filled with air when
they go to the moon. If they did not wear these space suits, the counter
pressure exerted by the body of the astronauts would make the blood vessels
burst. The astronauts would bleed.
Q.7 How is rainfall important for us? What happens when there is excess
rain? [V. Imp.]
Ans. Rainfall is very important for the survival of plants and animals.
It brings fresh water to the earth’s surface. If rainfall is less, there is
water scarcity which sometimes causes drought like situation. If there is
excess rain, floods take place which makes the life of the affected people
miserable.
12. Which element of weather is measured in degree
Celsius?
(a) Temperature
(b) Pressure
(c) Wind
(d) Gravity
13. The water boils at
(a) 10°C
(b) 50°C
(c) 75°C
(d) 100°C
14. Where is the air pressure highest?
(a) Moon
(b) Sea Level
(c) Stratosphere
(d) Exosphere
15. What is very hot wind called?
(a) Loo
(b) Cool breeze
(c) Monsoon air
(d) Trade wind
16. Which one of the following is a local wind?
(a) Sea breeze
(b) Trade wind
(c) Monsoon wind
(d) None of these
17. Rain, snow sleet or hail are the different
forms of:
(a) Condensation
(b) Evaporation
(c) Precipitation
(d) All of these
Fill in the blanks with appropriate words:1. Earth
is surrounded by a blanket of air called ……… ….
2. Green plants produce …………. during
photosynthesis.
3. Increased volume of ………….. is affecting the
earth’s weather and climate.
4. Ionosphere is the part of ……………
5. Amount of rainfall is measured by ………….
6. Insolation influences the distribution of …………….
State whether the given statements are true or
false.1. Hot
air is dense and heavy and cold air is lighter and expands.
2. Without Greenhouse effect earth would have been
too cold to live.
3. Ionosphere contains the ozone layer.
4. Helium and hydrogen float from exosphere into
space.
5. Wind-vane shows the direction of wind.
6. Air moves from high pressure to low pressure.
ANSWERSMCQS
1
2
3
4
5
6
7
8
9
10
A
B
D
C
A
C
A
D
B
A
11
12
13
14
15
16
17
D
A
D
B
A
A
C
FILL IN
THE BLANKS
1. Atmosphere,
2- Oxygen, 3-co2, 4-Thermosphere, 5- rainguage,, 6-Temprature
True/
false
1.False, 2- True,
3- False 4. True, 5- True, 6.-True
1. How does carbon dioxide
create green house effect?
Answer: Crbon dioxide creates greenhouse effect by trapping
the heat radiated from the earth.
2. What is the significance
of greenhouse gas?
Answer: Without the greenhouse gas the earth would have been
too cold to line in.
3. What happens when air is
heated?
Answer: When air is heated, it expands, becomes lighter and goes
up.
4. What is the nature of
cold air?
Ans. It has tendency to go down.
5. Why do green plants use
carbon dioxide? [Imp.]
Answer: Green plants use carbon dioxide to make their food
and release oxygen.
6. What is an important
feature of Stratosphere?
Answer: Stratosphere contains a layer of ozone gas.
7. How is ozone important
for us? [Imp.]
Answer: It protects us from the harmful effect of the sunrays.
8. What is temperature?
Answer: The degree of hotness and coldness of the air is known as
temperature.
9. What is insolation?
Answer: Insolation is the incoming solar energy intercepted
by the earth.
10. Why is there no air
pressure on the moon?
Answer: There is no air on the moon and therefore no air pressure.
11. Where is air pressure
highest?
Answer: Air pressure is highest at the sea level.
12. How does air move?
Answer: Air moves from high pressure areas to low pressure
areas.
13. Name three types of
winds.
Answer:
1.
Permanent winds
2.
Seasonal winds
3.
Local winds.
14. What is the hot
and dry wind of northern planes of India called?
Ans. It is called loo.
Q.15 What is called humidity? [V. Imp.]
Ans. Moisture in the air at any time is called humidity.
Q 16 Why do we feel uncomfortable on a humid day?
Ans. It is because sweat from our body does not evaporate easily.
Q.17 How is the flooding of low lying areas caused? [V. Imp.]
Ans. When trees on hill sides are cut, rainwater flows down the bare
mountains. This causes flooding of low lying areas.
Q.18 Name various forms of precipitation.
Ans.
1.
Rain
2.
Snow
3.
Sleet
4.
Hail
Q.19 How is a wind named?
Ans. A wind is named after the direction from which it
blows.
SHORT ANSWER TYPE QUESTIONS
Q.1 Give an account of the composition of the atmosphere. [V. Imp.]
Ans. Our atmosphere is composed of mainly two gases—nitrogen (78%)
and oxygen (21%). Other gases like carbon dioxide, helium, ozone, orgon and
hydrogen are found in lesser quantities. Apart from these gases, tiny dust
particles are also present in the air.
Q.2 How do Bacteria help plants use nitrogen? [V. Imp.]
Ans. Nitrogen is essential for the survival of the plant. But
plants cannot take nitrogen directly from the air. Bacteria, that live in the
soil and roots of some plants, take nitrogen from the air and change its form
so that plants can use it.
Q.3 How does nature balance our life? What is the result if this balance
is disturbed?[V. Imp.]
Ans. Green plants use carbon dioxide to make their food and release
oxygen. Humans or animals release carbon dioxide. The amount of carbon dioxide
released by humans or animals seems to be equal to the amount used by the
plants which make a perfect balance. But this balance is disturbed by the burning
of fuels, which add billions of tons of carbon dioxide in the atmosphere. As a
result, the increased volume of carbon dioxide is affecting the earth’s weather
and climate.
Q.4 Why is temperature in cities much higher than that of villages ?
Ans. In cities, we find high rise buildings. The concrete and metals in
these buildings and the asaphalt of roads get heated up during the day. This
heat is released during the night.
Another reason is that the crowded high rise buildings of the cities trap the
warm air and thus raise the temperature of the cities.
Q.5 Write a short note on the distribution of air pressure in the
atmosphere. [Imp.]
Ans. Air pressure is the pressure exerted by the weight of air on the
earth’s surface. As we go up the layers of the atmosphere, the pressure falls
rapidly. The air pressure is highest at the sea level and decreases with
height. Horizonally the distribution of air pressure is influenced by the
temperature of the air at a given place. In areas where the temperature is high
the air gets heated and rises. This creates a low-pressure area. In areas
having lower temperature, the air is cold, hence, it is heavy. Heavy air sinks
and creates a high-pressure area.
Q.6 Why do astronauts wear special protective suits when they go to the
moon?
Ans. Astronauts wear special protective space suits filled with air when
they go to the moon. If they did not wear these space suits, the counter
pressure exerted by the body of the astronauts would make the blood vessels
burst. The astronauts would bleed.
Q.7 How is rainfall important for us? What happens when there is excess
rain? [V. Imp.]
Ans. Rainfall is very important for the survival of plants and animals.
It brings fresh water to the earth’s surface. If rainfall is less, there is
water scarcity which sometimes causes drought like situation. If there is
excess rain, floods take place which makes the life of the affected people
miserable.
13. The water boils at
(a) 10°C
(b) 50°C
(c) 75°C
(d) 100°C
14. Where is the air pressure highest?
(a) Moon
(b) Sea Level
(c) Stratosphere
(d) Exosphere
15. What is very hot wind called?
(a) Loo
(b) Cool breeze
(c) Monsoon air
(d) Trade wind
16. Which one of the following is a local wind?
(a) Sea breeze
(b) Trade wind
(c) Monsoon wind
(d) None of these
17. Rain, snow sleet or hail are the different
forms of:
(a) Condensation
(b) Evaporation
(c) Precipitation
(d) All of these
Fill in the blanks with appropriate words:1. Earth
is surrounded by a blanket of air called ……… ….
2. Green plants produce …………. during
photosynthesis.
3. Increased volume of ………….. is affecting the
earth’s weather and climate.
4. Ionosphere is the part of ……………
5. Amount of rainfall is measured by ………….
6. Insolation influences the distribution of …………….
State whether the given statements are true or
false.1. Hot
air is dense and heavy and cold air is lighter and expands.
2. Without Greenhouse effect earth would have been
too cold to live.
3. Ionosphere contains the ozone layer.
4. Helium and hydrogen float from exosphere into
space.
5. Wind-vane shows the direction of wind.
6. Air moves from high pressure to low pressure.
ANSWERSMCQS
1
2
3
4
5
6
7
8
9
10
A
B
D
C
A
C
A
D
B
A
11
12
13
14
15
16
17
D
A
D
B
A
A
C
FILL IN
THE BLANKS
1. Atmosphere,
2- Oxygen, 3-co2, 4-Thermosphere, 5- rainguage,, 6-Temprature
True/
false
1.False, 2- True,
3- False 4. True, 5- True, 6.-True
1. How does carbon dioxide
create green house effect?
Answer: Crbon dioxide creates greenhouse effect by trapping
the heat radiated from the earth.
2. What is the significance
of greenhouse gas?
Answer: Without the greenhouse gas the earth would have been
too cold to line in.
3. What happens when air is
heated?
Answer: When air is heated, it expands, becomes lighter and goes
up.
4. What is the nature of
cold air?
Ans. It has tendency to go down.
5. Why do green plants use
carbon dioxide? [Imp.]
Answer: Green plants use carbon dioxide to make their food
and release oxygen.
6. What is an important
feature of Stratosphere?
Answer: Stratosphere contains a layer of ozone gas.
7. How is ozone important
for us? [Imp.]
Answer: It protects us from the harmful effect of the sunrays.
8. What is temperature?
Answer: The degree of hotness and coldness of the air is known as
temperature.
9. What is insolation?
Answer: Insolation is the incoming solar energy intercepted
by the earth.
10. Why is there no air
pressure on the moon?
Answer: There is no air on the moon and therefore no air pressure.
11. Where is air pressure
highest?
Answer: Air pressure is highest at the sea level.
12. How does air move?
Answer: Air moves from high pressure areas to low pressure
areas.
13. Name three types of
winds.
Answer:
1.
Permanent winds
2.
Seasonal winds
3.
Local winds.
14. What is the hot
and dry wind of northern planes of India called?
Ans. It is called loo.
Q.15 What is called humidity? [V. Imp.]
Ans. Moisture in the air at any time is called humidity.
Q 16 Why do we feel uncomfortable on a humid day?
Ans. It is because sweat from our body does not evaporate easily.
Q.17 How is the flooding of low lying areas caused? [V. Imp.]
Ans. When trees on hill sides are cut, rainwater flows down the bare
mountains. This causes flooding of low lying areas.
Q.18 Name various forms of precipitation.
Ans.
1.
Rain
2.
Snow
3.
Sleet
4.
Hail
Q.19 How is a wind named?
Ans. A wind is named after the direction from which it
blows.
SHORT ANSWER TYPE QUESTIONS
Q.1 Give an account of the composition of the atmosphere. [V. Imp.]
Ans. Our atmosphere is composed of mainly two gases—nitrogen (78%)
and oxygen (21%). Other gases like carbon dioxide, helium, ozone, orgon and
hydrogen are found in lesser quantities. Apart from these gases, tiny dust
particles are also present in the air.
Q.2 How do Bacteria help plants use nitrogen? [V. Imp.]
Ans. Nitrogen is essential for the survival of the plant. But
plants cannot take nitrogen directly from the air. Bacteria, that live in the
soil and roots of some plants, take nitrogen from the air and change its form
so that plants can use it.
Q.3 How does nature balance our life? What is the result if this balance
is disturbed?[V. Imp.]
Ans. Green plants use carbon dioxide to make their food and release
oxygen. Humans or animals release carbon dioxide. The amount of carbon dioxide
released by humans or animals seems to be equal to the amount used by the
plants which make a perfect balance. But this balance is disturbed by the burning
of fuels, which add billions of tons of carbon dioxide in the atmosphere. As a
result, the increased volume of carbon dioxide is affecting the earth’s weather
and climate.
Q.4 Why is temperature in cities much higher than that of villages ?
Ans. In cities, we find high rise buildings. The concrete and metals in
these buildings and the asaphalt of roads get heated up during the day. This
heat is released during the night.
Another reason is that the crowded high rise buildings of the cities trap the
warm air and thus raise the temperature of the cities.
Q.5 Write a short note on the distribution of air pressure in the
atmosphere. [Imp.]
Ans. Air pressure is the pressure exerted by the weight of air on the
earth’s surface. As we go up the layers of the atmosphere, the pressure falls
rapidly. The air pressure is highest at the sea level and decreases with
height. Horizonally the distribution of air pressure is influenced by the
temperature of the air at a given place. In areas where the temperature is high
the air gets heated and rises. This creates a low-pressure area. In areas
having lower temperature, the air is cold, hence, it is heavy. Heavy air sinks
and creates a high-pressure area.
Q.6 Why do astronauts wear special protective suits when they go to the
moon?
Ans. Astronauts wear special protective space suits filled with air when
they go to the moon. If they did not wear these space suits, the counter
pressure exerted by the body of the astronauts would make the blood vessels
burst. The astronauts would bleed.
Q.7 How is rainfall important for us? What happens when there is excess
rain? [V. Imp.]
Ans. Rainfall is very important for the survival of plants and animals.
It brings fresh water to the earth’s surface. If rainfall is less, there is
water scarcity which sometimes causes drought like situation. If there is
excess rain, floods take place which makes the life of the affected people
miserable.
14. Where is the air pressure highest?
(a) Moon
(b) Sea Level
(c) Stratosphere
(d) Exosphere
15. What is very hot wind called?
(a) Loo
(b) Cool breeze
(c) Monsoon air
(d) Trade wind
16. Which one of the following is a local wind?
(a) Sea breeze
(b) Trade wind
(c) Monsoon wind
(d) None of these
17. Rain, snow sleet or hail are the different
forms of:
(a) Condensation
(b) Evaporation
(c) Precipitation
(d) All of these
Fill in the blanks with appropriate words:1. Earth
is surrounded by a blanket of air called ……… ….
2. Green plants produce …………. during
photosynthesis.
3. Increased volume of ………….. is affecting the
earth’s weather and climate.
4. Ionosphere is the part of ……………
5. Amount of rainfall is measured by ………….
6. Insolation influences the distribution of …………….
State whether the given statements are true or
false.1. Hot
air is dense and heavy and cold air is lighter and expands.
2. Without Greenhouse effect earth would have been
too cold to live.
3. Ionosphere contains the ozone layer.
4. Helium and hydrogen float from exosphere into
space.
5. Wind-vane shows the direction of wind.
6. Air moves from high pressure to low pressure.
ANSWERSMCQS
1
2
3
4
5
6
7
8
9
10
A
B
D
C
A
C
A
D
B
A
11
12
13
14
15
16
17
D
A
D
B
A
A
C
FILL IN
THE BLANKS
1. Atmosphere,
2- Oxygen, 3-co2, 4-Thermosphere, 5- rainguage,, 6-Temprature
True/
false
1.False, 2- True,
3- False 4. True, 5- True, 6.-True
1. How does carbon dioxide
create green house effect?
Answer: Crbon dioxide creates greenhouse effect by trapping
the heat radiated from the earth.
2. What is the significance
of greenhouse gas?
Answer: Without the greenhouse gas the earth would have been
too cold to line in.
3. What happens when air is
heated?
Answer: When air is heated, it expands, becomes lighter and goes
up.
4. What is the nature of
cold air?
Ans. It has tendency to go down.
5. Why do green plants use
carbon dioxide? [Imp.]
Answer: Green plants use carbon dioxide to make their food
and release oxygen.
6. What is an important
feature of Stratosphere?
Answer: Stratosphere contains a layer of ozone gas.
7. How is ozone important
for us? [Imp.]
Answer: It protects us from the harmful effect of the sunrays.
8. What is temperature?
Answer: The degree of hotness and coldness of the air is known as
temperature.
9. What is insolation?
Answer: Insolation is the incoming solar energy intercepted
by the earth.
10. Why is there no air
pressure on the moon?
Answer: There is no air on the moon and therefore no air pressure.
11. Where is air pressure
highest?
Answer: Air pressure is highest at the sea level.
12. How does air move?
Answer: Air moves from high pressure areas to low pressure
areas.
13. Name three types of
winds.
Answer:
1.
Permanent winds
2.
Seasonal winds
3.
Local winds.
14. What is the hot
and dry wind of northern planes of India called?
Ans. It is called loo.
Q.15 What is called humidity? [V. Imp.]
Ans. Moisture in the air at any time is called humidity.
Q 16 Why do we feel uncomfortable on a humid day?
Ans. It is because sweat from our body does not evaporate easily.
Q.17 How is the flooding of low lying areas caused? [V. Imp.]
Ans. When trees on hill sides are cut, rainwater flows down the bare
mountains. This causes flooding of low lying areas.
Q.18 Name various forms of precipitation.
Ans.
1.
Rain
2.
Snow
3.
Sleet
4.
Hail
Q.19 How is a wind named?
Ans. A wind is named after the direction from which it
blows.
SHORT ANSWER TYPE QUESTIONS
Q.1 Give an account of the composition of the atmosphere. [V. Imp.]
Ans. Our atmosphere is composed of mainly two gases—nitrogen (78%)
and oxygen (21%). Other gases like carbon dioxide, helium, ozone, orgon and
hydrogen are found in lesser quantities. Apart from these gases, tiny dust
particles are also present in the air.
Q.2 How do Bacteria help plants use nitrogen? [V. Imp.]
Ans. Nitrogen is essential for the survival of the plant. But
plants cannot take nitrogen directly from the air. Bacteria, that live in the
soil and roots of some plants, take nitrogen from the air and change its form
so that plants can use it.
Q.3 How does nature balance our life? What is the result if this balance
is disturbed?[V. Imp.]
Ans. Green plants use carbon dioxide to make their food and release
oxygen. Humans or animals release carbon dioxide. The amount of carbon dioxide
released by humans or animals seems to be equal to the amount used by the
plants which make a perfect balance. But this balance is disturbed by the burning
of fuels, which add billions of tons of carbon dioxide in the atmosphere. As a
result, the increased volume of carbon dioxide is affecting the earth’s weather
and climate.
Q.4 Why is temperature in cities much higher than that of villages ?
Ans. In cities, we find high rise buildings. The concrete and metals in
these buildings and the asaphalt of roads get heated up during the day. This
heat is released during the night.
Another reason is that the crowded high rise buildings of the cities trap the
warm air and thus raise the temperature of the cities.
Q.5 Write a short note on the distribution of air pressure in the
atmosphere. [Imp.]
Ans. Air pressure is the pressure exerted by the weight of air on the
earth’s surface. As we go up the layers of the atmosphere, the pressure falls
rapidly. The air pressure is highest at the sea level and decreases with
height. Horizonally the distribution of air pressure is influenced by the
temperature of the air at a given place. In areas where the temperature is high
the air gets heated and rises. This creates a low-pressure area. In areas
having lower temperature, the air is cold, hence, it is heavy. Heavy air sinks
and creates a high-pressure area.
Q.6 Why do astronauts wear special protective suits when they go to the
moon?
Ans. Astronauts wear special protective space suits filled with air when
they go to the moon. If they did not wear these space suits, the counter
pressure exerted by the body of the astronauts would make the blood vessels
burst. The astronauts would bleed.
Q.7 How is rainfall important for us? What happens when there is excess
rain? [V. Imp.]
Ans. Rainfall is very important for the survival of plants and animals.
It brings fresh water to the earth’s surface. If rainfall is less, there is
water scarcity which sometimes causes drought like situation. If there is
excess rain, floods take place which makes the life of the affected people
miserable.
15. What is very hot wind called?
(a) Loo
(b) Cool breeze
(c) Monsoon air
(d) Trade wind
16. Which one of the following is a local wind?
(a) Sea breeze
(b) Trade wind
(c) Monsoon wind
(d) None of these
17. Rain, snow sleet or hail are the different
forms of:
(a) Condensation
(b) Evaporation
(c) Precipitation
(d) All of these
Fill in the blanks with appropriate words:1. Earth
is surrounded by a blanket of air called ……… ….
2. Green plants produce …………. during
photosynthesis.
3. Increased volume of ………….. is affecting the
earth’s weather and climate.
4. Ionosphere is the part of ……………
5. Amount of rainfall is measured by ………….
6. Insolation influences the distribution of …………….
State whether the given statements are true or
false.1. Hot
air is dense and heavy and cold air is lighter and expands.
2. Without Greenhouse effect earth would have been
too cold to live.
3. Ionosphere contains the ozone layer.
4. Helium and hydrogen float from exosphere into
space.
5. Wind-vane shows the direction of wind.
6. Air moves from high pressure to low pressure.
ANSWERSMCQS
1
2
3
4
5
6
7
8
9
10
A
B
D
C
A
C
A
D
B
A
11
12
13
14
15
16
17
D
A
D
B
A
A
C
FILL IN
THE BLANKS
1. Atmosphere,
2- Oxygen, 3-co2, 4-Thermosphere, 5- rainguage,, 6-Temprature
True/
false
1.False, 2- True,
3- False 4. True, 5- True, 6.-True
1. How does carbon dioxide
create green house effect?
Answer: Crbon dioxide creates greenhouse effect by trapping
the heat radiated from the earth.
2. What is the significance
of greenhouse gas?
Answer: Without the greenhouse gas the earth would have been
too cold to line in.
3. What happens when air is
heated?
Answer: When air is heated, it expands, becomes lighter and goes
up.
4. What is the nature of
cold air?
Ans. It has tendency to go down.
5. Why do green plants use
carbon dioxide? [Imp.]
Answer: Green plants use carbon dioxide to make their food
and release oxygen.
6. What is an important
feature of Stratosphere?
Answer: Stratosphere contains a layer of ozone gas.
7. How is ozone important
for us? [Imp.]
Answer: It protects us from the harmful effect of the sunrays.
8. What is temperature?
Answer: The degree of hotness and coldness of the air is known as
temperature.
9. What is insolation?
Answer: Insolation is the incoming solar energy intercepted
by the earth.
10. Why is there no air
pressure on the moon?
Answer: There is no air on the moon and therefore no air pressure.
11. Where is air pressure
highest?
Answer: Air pressure is highest at the sea level.
12. How does air move?
Answer: Air moves from high pressure areas to low pressure
areas.
13. Name three types of
winds.
Answer:
1.
Permanent winds
2.
Seasonal winds
3.
Local winds.
14. What is the hot
and dry wind of northern planes of India called?
Ans. It is called loo.
Q.15 What is called humidity? [V. Imp.]
Ans. Moisture in the air at any time is called humidity.
Q 16 Why do we feel uncomfortable on a humid day?
Ans. It is because sweat from our body does not evaporate easily.
Q.17 How is the flooding of low lying areas caused? [V. Imp.]
Ans. When trees on hill sides are cut, rainwater flows down the bare
mountains. This causes flooding of low lying areas.
Q.18 Name various forms of precipitation.
Ans.
1.
Rain
2.
Snow
3.
Sleet
4.
Hail
Q.19 How is a wind named?
Ans. A wind is named after the direction from which it
blows.
SHORT ANSWER TYPE QUESTIONS
Q.1 Give an account of the composition of the atmosphere. [V. Imp.]
Ans. Our atmosphere is composed of mainly two gases—nitrogen (78%)
and oxygen (21%). Other gases like carbon dioxide, helium, ozone, orgon and
hydrogen are found in lesser quantities. Apart from these gases, tiny dust
particles are also present in the air.
Q.2 How do Bacteria help plants use nitrogen? [V. Imp.]
Ans. Nitrogen is essential for the survival of the plant. But
plants cannot take nitrogen directly from the air. Bacteria, that live in the
soil and roots of some plants, take nitrogen from the air and change its form
so that plants can use it.
Q.3 How does nature balance our life? What is the result if this balance
is disturbed?[V. Imp.]
Ans. Green plants use carbon dioxide to make their food and release
oxygen. Humans or animals release carbon dioxide. The amount of carbon dioxide
released by humans or animals seems to be equal to the amount used by the
plants which make a perfect balance. But this balance is disturbed by the burning
of fuels, which add billions of tons of carbon dioxide in the atmosphere. As a
result, the increased volume of carbon dioxide is affecting the earth’s weather
and climate.
Q.4 Why is temperature in cities much higher than that of villages ?
Ans. In cities, we find high rise buildings. The concrete and metals in
these buildings and the asaphalt of roads get heated up during the day. This
heat is released during the night.
Another reason is that the crowded high rise buildings of the cities trap the
warm air and thus raise the temperature of the cities.
Q.5 Write a short note on the distribution of air pressure in the
atmosphere. [Imp.]
Ans. Air pressure is the pressure exerted by the weight of air on the
earth’s surface. As we go up the layers of the atmosphere, the pressure falls
rapidly. The air pressure is highest at the sea level and decreases with
height. Horizonally the distribution of air pressure is influenced by the
temperature of the air at a given place. In areas where the temperature is high
the air gets heated and rises. This creates a low-pressure area. In areas
having lower temperature, the air is cold, hence, it is heavy. Heavy air sinks
and creates a high-pressure area.
Q.6 Why do astronauts wear special protective suits when they go to the
moon?
Ans. Astronauts wear special protective space suits filled with air when
they go to the moon. If they did not wear these space suits, the counter
pressure exerted by the body of the astronauts would make the blood vessels
burst. The astronauts would bleed.
Q.7 How is rainfall important for us? What happens when there is excess
rain? [V. Imp.]
Ans. Rainfall is very important for the survival of plants and animals.
It brings fresh water to the earth’s surface. If rainfall is less, there is
water scarcity which sometimes causes drought like situation. If there is
excess rain, floods take place which makes the life of the affected people
miserable.
16. Which one of the following is a local wind?
(a) Sea breeze
(b) Trade wind
(c) Monsoon wind
(d) None of these
17. Rain, snow sleet or hail are the different
forms of:
(a) Condensation
(b) Evaporation
(c) Precipitation
(d) All of these
Fill in the blanks with appropriate words:1. Earth
is surrounded by a blanket of air called ……… ….
2. Green plants produce …………. during
photosynthesis.
3. Increased volume of ………….. is affecting the
earth’s weather and climate.
4. Ionosphere is the part of ……………
5. Amount of rainfall is measured by ………….
6. Insolation influences the distribution of …………….
State whether the given statements are true or
false.1. Hot
air is dense and heavy and cold air is lighter and expands.
2. Without Greenhouse effect earth would have been
too cold to live.
3. Ionosphere contains the ozone layer.
4. Helium and hydrogen float from exosphere into
space.
5. Wind-vane shows the direction of wind.
6. Air moves from high pressure to low pressure.
ANSWERSMCQS
1
2
3
4
5
6
7
8
9
10
A
B
D
C
A
C
A
D
B
A
11
12
13
14
15
16
17
D
A
D
B
A
A
C
FILL IN
THE BLANKS
1. Atmosphere,
2- Oxygen, 3-co2, 4-Thermosphere, 5- rainguage,, 6-Temprature
True/
false
1.False, 2- True,
3- False 4. True, 5- True, 6.-True
1. How does carbon dioxide
create green house effect?
Answer: Crbon dioxide creates greenhouse effect by trapping
the heat radiated from the earth.
2. What is the significance
of greenhouse gas?
Answer: Without the greenhouse gas the earth would have been
too cold to line in.
3. What happens when air is
heated?
Answer: When air is heated, it expands, becomes lighter and goes
up.
4. What is the nature of
cold air?
Ans. It has tendency to go down.
5. Why do green plants use
carbon dioxide? [Imp.]
Answer: Green plants use carbon dioxide to make their food
and release oxygen.
6. What is an important
feature of Stratosphere?
Answer: Stratosphere contains a layer of ozone gas.
7. How is ozone important
for us? [Imp.]
Answer: It protects us from the harmful effect of the sunrays.
8. What is temperature?
Answer: The degree of hotness and coldness of the air is known as
temperature.
9. What is insolation?
Answer: Insolation is the incoming solar energy intercepted
by the earth.
10. Why is there no air
pressure on the moon?
Answer: There is no air on the moon and therefore no air pressure.
11. Where is air pressure
highest?
Answer: Air pressure is highest at the sea level.
12. How does air move?
Answer: Air moves from high pressure areas to low pressure
areas.
13. Name three types of
winds.
Answer:
1.
Permanent winds
2.
Seasonal winds
3.
Local winds.
14. What is the hot
and dry wind of northern planes of India called?
Ans. It is called loo.
Q.15 What is called humidity? [V. Imp.]
Ans. Moisture in the air at any time is called humidity.
Q 16 Why do we feel uncomfortable on a humid day?
Ans. It is because sweat from our body does not evaporate easily.
Q.17 How is the flooding of low lying areas caused? [V. Imp.]
Ans. When trees on hill sides are cut, rainwater flows down the bare
mountains. This causes flooding of low lying areas.
Q.18 Name various forms of precipitation.
Ans.
1.
Rain
2.
Snow
3.
Sleet
4.
Hail
Q.19 How is a wind named?
Ans. A wind is named after the direction from which it
blows.
SHORT ANSWER TYPE QUESTIONS
Q.1 Give an account of the composition of the atmosphere. [V. Imp.]
Ans. Our atmosphere is composed of mainly two gases—nitrogen (78%)
and oxygen (21%). Other gases like carbon dioxide, helium, ozone, orgon and
hydrogen are found in lesser quantities. Apart from these gases, tiny dust
particles are also present in the air.
Q.2 How do Bacteria help plants use nitrogen? [V. Imp.]
Ans. Nitrogen is essential for the survival of the plant. But
plants cannot take nitrogen directly from the air. Bacteria, that live in the
soil and roots of some plants, take nitrogen from the air and change its form
so that plants can use it.
Q.3 How does nature balance our life? What is the result if this balance
is disturbed?[V. Imp.]
Ans. Green plants use carbon dioxide to make their food and release
oxygen. Humans or animals release carbon dioxide. The amount of carbon dioxide
released by humans or animals seems to be equal to the amount used by the
plants which make a perfect balance. But this balance is disturbed by the burning
of fuels, which add billions of tons of carbon dioxide in the atmosphere. As a
result, the increased volume of carbon dioxide is affecting the earth’s weather
and climate.
Q.4 Why is temperature in cities much higher than that of villages ?
Ans. In cities, we find high rise buildings. The concrete and metals in
these buildings and the asaphalt of roads get heated up during the day. This
heat is released during the night.
Another reason is that the crowded high rise buildings of the cities trap the
warm air and thus raise the temperature of the cities.
Q.5 Write a short note on the distribution of air pressure in the
atmosphere. [Imp.]
Ans. Air pressure is the pressure exerted by the weight of air on the
earth’s surface. As we go up the layers of the atmosphere, the pressure falls
rapidly. The air pressure is highest at the sea level and decreases with
height. Horizonally the distribution of air pressure is influenced by the
temperature of the air at a given place. In areas where the temperature is high
the air gets heated and rises. This creates a low-pressure area. In areas
having lower temperature, the air is cold, hence, it is heavy. Heavy air sinks
and creates a high-pressure area.
Q.6 Why do astronauts wear special protective suits when they go to the
moon?
Ans. Astronauts wear special protective space suits filled with air when
they go to the moon. If they did not wear these space suits, the counter
pressure exerted by the body of the astronauts would make the blood vessels
burst. The astronauts would bleed.
Q.7 How is rainfall important for us? What happens when there is excess
rain? [V. Imp.]
Ans. Rainfall is very important for the survival of plants and animals.
It brings fresh water to the earth’s surface. If rainfall is less, there is
water scarcity which sometimes causes drought like situation. If there is
excess rain, floods take place which makes the life of the affected people
miserable.
17. Rain, snow sleet or hail are the different
forms of:
(a) Condensation
(b) Evaporation
(c) Precipitation
(d) All of these
Fill in the blanks with appropriate words:1. Earth
is surrounded by a blanket of air called ……… ….
2. Green plants produce …………. during
photosynthesis.
3. Increased volume of ………….. is affecting the
earth’s weather and climate.
4. Ionosphere is the part of ……………
5. Amount of rainfall is measured by ………….
6. Insolation influences the distribution of …………….
State whether the given statements are true or
false.1. Hot
air is dense and heavy and cold air is lighter and expands.
2. Without Greenhouse effect earth would have been
too cold to live.
3. Ionosphere contains the ozone layer.
4. Helium and hydrogen float from exosphere into
space.
5. Wind-vane shows the direction of wind.
6. Air moves from high pressure to low pressure.
ANSWERSMCQS
1
2
3
4
5
6
7
8
9
10
A
B
D
C
A
C
A
D
B
A
11
12
13
14
15
16
17
D
A
D
B
A
A
C
FILL IN
THE BLANKS
1. Atmosphere,
2- Oxygen, 3-co2, 4-Thermosphere, 5- rainguage,, 6-Temprature
True/
false
1.False, 2- True,
3- False 4. True, 5- True, 6.-True
1. How does carbon dioxide
create green house effect?
Answer: Crbon dioxide creates greenhouse effect by trapping
the heat radiated from the earth.
2. What is the significance
of greenhouse gas?
Answer: Without the greenhouse gas the earth would have been
too cold to line in.
3. What happens when air is
heated?
Answer: When air is heated, it expands, becomes lighter and goes
up.
4. What is the nature of
cold air?
Ans. It has tendency to go down.
5. Why do green plants use
carbon dioxide? [Imp.]
Answer: Green plants use carbon dioxide to make their food
and release oxygen.
6. What is an important
feature of Stratosphere?
Answer: Stratosphere contains a layer of ozone gas.
7. How is ozone important
for us? [Imp.]
Answer: It protects us from the harmful effect of the sunrays.
8. What is temperature?
Answer: The degree of hotness and coldness of the air is known as
temperature.
9. What is insolation?
Answer: Insolation is the incoming solar energy intercepted
by the earth.
10. Why is there no air
pressure on the moon?
Answer: There is no air on the moon and therefore no air pressure.
11. Where is air pressure
highest?
Answer: Air pressure is highest at the sea level.
12. How does air move?
Answer: Air moves from high pressure areas to low pressure
areas.
13. Name three types of
winds.
Answer:
1.
Permanent winds
2.
Seasonal winds
3.
Local winds.
14. What is the hot
and dry wind of northern planes of India called?
Ans. It is called loo.
Q.15 What is called humidity? [V. Imp.]
Ans. Moisture in the air at any time is called humidity.
Q 16 Why do we feel uncomfortable on a humid day?
Ans. It is because sweat from our body does not evaporate easily.
Q.17 How is the flooding of low lying areas caused? [V. Imp.]
Ans. When trees on hill sides are cut, rainwater flows down the bare
mountains. This causes flooding of low lying areas.
Q.18 Name various forms of precipitation.
Ans.
1.
Rain
2.
Snow
3.
Sleet
4.
Hail
Q.19 How is a wind named?
Ans. A wind is named after the direction from which it
blows.
SHORT ANSWER TYPE QUESTIONS
Q.1 Give an account of the composition of the atmosphere. [V. Imp.]
Ans. Our atmosphere is composed of mainly two gases—nitrogen (78%)
and oxygen (21%). Other gases like carbon dioxide, helium, ozone, orgon and
hydrogen are found in lesser quantities. Apart from these gases, tiny dust
particles are also present in the air.
Q.2 How do Bacteria help plants use nitrogen? [V. Imp.]
Ans. Nitrogen is essential for the survival of the plant. But
plants cannot take nitrogen directly from the air. Bacteria, that live in the
soil and roots of some plants, take nitrogen from the air and change its form
so that plants can use it.
Q.3 How does nature balance our life? What is the result if this balance
is disturbed?[V. Imp.]
Ans. Green plants use carbon dioxide to make their food and release
oxygen. Humans or animals release carbon dioxide. The amount of carbon dioxide
released by humans or animals seems to be equal to the amount used by the
plants which make a perfect balance. But this balance is disturbed by the burning
of fuels, which add billions of tons of carbon dioxide in the atmosphere. As a
result, the increased volume of carbon dioxide is affecting the earth’s weather
and climate.
Q.4 Why is temperature in cities much higher than that of villages ?
Ans. In cities, we find high rise buildings. The concrete and metals in
these buildings and the asaphalt of roads get heated up during the day. This
heat is released during the night.
Another reason is that the crowded high rise buildings of the cities trap the
warm air and thus raise the temperature of the cities.
Q.5 Write a short note on the distribution of air pressure in the
atmosphere. [Imp.]
Ans. Air pressure is the pressure exerted by the weight of air on the
earth’s surface. As we go up the layers of the atmosphere, the pressure falls
rapidly. The air pressure is highest at the sea level and decreases with
height. Horizonally the distribution of air pressure is influenced by the
temperature of the air at a given place. In areas where the temperature is high
the air gets heated and rises. This creates a low-pressure area. In areas
having lower temperature, the air is cold, hence, it is heavy. Heavy air sinks
and creates a high-pressure area.
Q.6 Why do astronauts wear special protective suits when they go to the
moon?
Ans. Astronauts wear special protective space suits filled with air when
they go to the moon. If they did not wear these space suits, the counter
pressure exerted by the body of the astronauts would make the blood vessels
burst. The astronauts would bleed.
Q.7 How is rainfall important for us? What happens when there is excess
rain? [V. Imp.]
Ans. Rainfall is very important for the survival of plants and animals.
It brings fresh water to the earth’s surface. If rainfall is less, there is
water scarcity which sometimes causes drought like situation. If there is
excess rain, floods take place which makes the life of the affected people
miserable.
Fill in the blanks with appropriate words:1. Earth
is surrounded by a blanket of air called ……… ….
2. Green plants produce …………. during
photosynthesis.
3. Increased volume of ………….. is affecting the
earth’s weather and climate.
4. Ionosphere is the part of ……………
5. Amount of rainfall is measured by ………….
6. Insolation influences the distribution of …………….
State whether the given statements are true or
false.1. Hot
air is dense and heavy and cold air is lighter and expands.
2. Without Greenhouse effect earth would have been
too cold to live.
3. Ionosphere contains the ozone layer.
4. Helium and hydrogen float from exosphere into
space.
5. Wind-vane shows the direction of wind.
6. Air moves from high pressure to low pressure.
ANSWERSMCQS
1
2
3
4
5
6
7
8
9
10
A
B
D
C
A
C
A
D
B
A
11
12
13
14
15
16
17
D
A
D
B
A
A
C
FILL IN
THE BLANKS
1. Atmosphere,
2- Oxygen, 3-co2, 4-Thermosphere, 5- rainguage,, 6-Temprature
True/
false
1.False, 2- True,
3- False 4. True, 5- True, 6.-True
1. How does carbon dioxide
create green house effect?
Answer: Crbon dioxide creates greenhouse effect by trapping
the heat radiated from the earth.
2. What is the significance
of greenhouse gas?
Answer: Without the greenhouse gas the earth would have been
too cold to line in.
3. What happens when air is
heated?
Answer: When air is heated, it expands, becomes lighter and goes
up.
4. What is the nature of
cold air?
Ans. It has tendency to go down.
5. Why do green plants use
carbon dioxide? [Imp.]
Answer: Green plants use carbon dioxide to make their food
and release oxygen.
6. What is an important
feature of Stratosphere?
Answer: Stratosphere contains a layer of ozone gas.
7. How is ozone important
for us? [Imp.]
Answer: It protects us from the harmful effect of the sunrays.
8. What is temperature?
Answer: The degree of hotness and coldness of the air is known as
temperature.
9. What is insolation?
Answer: Insolation is the incoming solar energy intercepted
by the earth.
10. Why is there no air
pressure on the moon?
Answer: There is no air on the moon and therefore no air pressure.
11. Where is air pressure
highest?
Answer: Air pressure is highest at the sea level.
12. How does air move?
Answer: Air moves from high pressure areas to low pressure
areas.
13. Name three types of
winds.
Answer:
1.
Permanent winds
2.
Seasonal winds
3.
Local winds.
14. What is the hot
and dry wind of northern planes of India called?
Ans. It is called loo.
Q.15 What is called humidity? [V. Imp.]
Ans. Moisture in the air at any time is called humidity.
Q 16 Why do we feel uncomfortable on a humid day?
Ans. It is because sweat from our body does not evaporate easily.
Q.17 How is the flooding of low lying areas caused? [V. Imp.]
Ans. When trees on hill sides are cut, rainwater flows down the bare
mountains. This causes flooding of low lying areas.
Q.18 Name various forms of precipitation.
Ans.
1.
Rain
2.
Snow
3.
Sleet
4.
Hail
Q.19 How is a wind named?
Ans. A wind is named after the direction from which it
blows.
SHORT ANSWER TYPE QUESTIONS
Q.1 Give an account of the composition of the atmosphere. [V. Imp.]
Ans. Our atmosphere is composed of mainly two gases—nitrogen (78%)
and oxygen (21%). Other gases like carbon dioxide, helium, ozone, orgon and
hydrogen are found in lesser quantities. Apart from these gases, tiny dust
particles are also present in the air.
Q.2 How do Bacteria help plants use nitrogen? [V. Imp.]
Ans. Nitrogen is essential for the survival of the plant. But
plants cannot take nitrogen directly from the air. Bacteria, that live in the
soil and roots of some plants, take nitrogen from the air and change its form
so that plants can use it.
Q.3 How does nature balance our life? What is the result if this balance
is disturbed?[V. Imp.]
Ans. Green plants use carbon dioxide to make their food and release
oxygen. Humans or animals release carbon dioxide. The amount of carbon dioxide
released by humans or animals seems to be equal to the amount used by the
plants which make a perfect balance. But this balance is disturbed by the burning
of fuels, which add billions of tons of carbon dioxide in the atmosphere. As a
result, the increased volume of carbon dioxide is affecting the earth’s weather
and climate.
Q.4 Why is temperature in cities much higher than that of villages ?
Ans. In cities, we find high rise buildings. The concrete and metals in
these buildings and the asaphalt of roads get heated up during the day. This
heat is released during the night.
Another reason is that the crowded high rise buildings of the cities trap the
warm air and thus raise the temperature of the cities.
Q.5 Write a short note on the distribution of air pressure in the
atmosphere. [Imp.]
Ans. Air pressure is the pressure exerted by the weight of air on the
earth’s surface. As we go up the layers of the atmosphere, the pressure falls
rapidly. The air pressure is highest at the sea level and decreases with
height. Horizonally the distribution of air pressure is influenced by the
temperature of the air at a given place. In areas where the temperature is high
the air gets heated and rises. This creates a low-pressure area. In areas
having lower temperature, the air is cold, hence, it is heavy. Heavy air sinks
and creates a high-pressure area.
Q.6 Why do astronauts wear special protective suits when they go to the
moon?
Ans. Astronauts wear special protective space suits filled with air when
they go to the moon. If they did not wear these space suits, the counter
pressure exerted by the body of the astronauts would make the blood vessels
burst. The astronauts would bleed.
Q.7 How is rainfall important for us? What happens when there is excess
rain? [V. Imp.]
Ans. Rainfall is very important for the survival of plants and animals.
It brings fresh water to the earth’s surface. If rainfall is less, there is
water scarcity which sometimes causes drought like situation. If there is
excess rain, floods take place which makes the life of the affected people
miserable.
2. Green plants produce …………. during
photosynthesis.
3. Increased volume of ………….. is affecting the
earth’s weather and climate.
4. Ionosphere is the part of ……………
5. Amount of rainfall is measured by ………….
6. Insolation influences the distribution of …………….
State whether the given statements are true or
false.1. Hot
air is dense and heavy and cold air is lighter and expands.
2. Without Greenhouse effect earth would have been
too cold to live.
3. Ionosphere contains the ozone layer.
4. Helium and hydrogen float from exosphere into
space.
5. Wind-vane shows the direction of wind.
6. Air moves from high pressure to low pressure.
ANSWERSMCQS
1
2
3
4
5
6
7
8
9
10
A
B
D
C
A
C
A
D
B
A
11
12
13
14
15
16
17
D
A
D
B
A
A
C
FILL IN
THE BLANKS
1. Atmosphere,
2- Oxygen, 3-co2, 4-Thermosphere, 5- rainguage,, 6-Temprature
True/
false
1.False, 2- True,
3- False 4. True, 5- True, 6.-True
1. How does carbon dioxide
create green house effect?
Answer: Crbon dioxide creates greenhouse effect by trapping
the heat radiated from the earth.
2. What is the significance
of greenhouse gas?
Answer: Without the greenhouse gas the earth would have been
too cold to line in.
3. What happens when air is
heated?
Answer: When air is heated, it expands, becomes lighter and goes
up.
4. What is the nature of
cold air?
Ans. It has tendency to go down.
5. Why do green plants use
carbon dioxide? [Imp.]
Answer: Green plants use carbon dioxide to make their food
and release oxygen.
6. What is an important
feature of Stratosphere?
Answer: Stratosphere contains a layer of ozone gas.
7. How is ozone important
for us? [Imp.]
Answer: It protects us from the harmful effect of the sunrays.
8. What is temperature?
Answer: The degree of hotness and coldness of the air is known as
temperature.
9. What is insolation?
Answer: Insolation is the incoming solar energy intercepted
by the earth.
10. Why is there no air
pressure on the moon?
Answer: There is no air on the moon and therefore no air pressure.
11. Where is air pressure
highest?
Answer: Air pressure is highest at the sea level.
12. How does air move?
Answer: Air moves from high pressure areas to low pressure
areas.
13. Name three types of
winds.
Answer:
1.
Permanent winds
2.
Seasonal winds
3.
Local winds.
14. What is the hot
and dry wind of northern planes of India called?
Ans. It is called loo.
Q.15 What is called humidity? [V. Imp.]
Ans. Moisture in the air at any time is called humidity.
Q 16 Why do we feel uncomfortable on a humid day?
Ans. It is because sweat from our body does not evaporate easily.
Q.17 How is the flooding of low lying areas caused? [V. Imp.]
Ans. When trees on hill sides are cut, rainwater flows down the bare
mountains. This causes flooding of low lying areas.
Q.18 Name various forms of precipitation.
Ans.
1.
Rain
2.
Snow
3.
Sleet
4.
Hail
Q.19 How is a wind named?
Ans. A wind is named after the direction from which it
blows.
SHORT ANSWER TYPE QUESTIONS
Q.1 Give an account of the composition of the atmosphere. [V. Imp.]
Ans. Our atmosphere is composed of mainly two gases—nitrogen (78%)
and oxygen (21%). Other gases like carbon dioxide, helium, ozone, orgon and
hydrogen are found in lesser quantities. Apart from these gases, tiny dust
particles are also present in the air.
Q.2 How do Bacteria help plants use nitrogen? [V. Imp.]
Ans. Nitrogen is essential for the survival of the plant. But
plants cannot take nitrogen directly from the air. Bacteria, that live in the
soil and roots of some plants, take nitrogen from the air and change its form
so that plants can use it.
Q.3 How does nature balance our life? What is the result if this balance
is disturbed?[V. Imp.]
Ans. Green plants use carbon dioxide to make their food and release
oxygen. Humans or animals release carbon dioxide. The amount of carbon dioxide
released by humans or animals seems to be equal to the amount used by the
plants which make a perfect balance. But this balance is disturbed by the burning
of fuels, which add billions of tons of carbon dioxide in the atmosphere. As a
result, the increased volume of carbon dioxide is affecting the earth’s weather
and climate.
Q.4 Why is temperature in cities much higher than that of villages ?
Ans. In cities, we find high rise buildings. The concrete and metals in
these buildings and the asaphalt of roads get heated up during the day. This
heat is released during the night.
Another reason is that the crowded high rise buildings of the cities trap the
warm air and thus raise the temperature of the cities.
Q.5 Write a short note on the distribution of air pressure in the
atmosphere. [Imp.]
Ans. Air pressure is the pressure exerted by the weight of air on the
earth’s surface. As we go up the layers of the atmosphere, the pressure falls
rapidly. The air pressure is highest at the sea level and decreases with
height. Horizonally the distribution of air pressure is influenced by the
temperature of the air at a given place. In areas where the temperature is high
the air gets heated and rises. This creates a low-pressure area. In areas
having lower temperature, the air is cold, hence, it is heavy. Heavy air sinks
and creates a high-pressure area.
Q.6 Why do astronauts wear special protective suits when they go to the
moon?
Ans. Astronauts wear special protective space suits filled with air when
they go to the moon. If they did not wear these space suits, the counter
pressure exerted by the body of the astronauts would make the blood vessels
burst. The astronauts would bleed.
Q.7 How is rainfall important for us? What happens when there is excess
rain? [V. Imp.]
Ans. Rainfall is very important for the survival of plants and animals.
It brings fresh water to the earth’s surface. If rainfall is less, there is
water scarcity which sometimes causes drought like situation. If there is
excess rain, floods take place which makes the life of the affected people
miserable.
3. Increased volume of ………….. is affecting the
earth’s weather and climate.
4. Ionosphere is the part of ……………
5. Amount of rainfall is measured by ………….
6. Insolation influences the distribution of …………….
State whether the given statements are true or
false.1. Hot
air is dense and heavy and cold air is lighter and expands.
2. Without Greenhouse effect earth would have been
too cold to live.
3. Ionosphere contains the ozone layer.
4. Helium and hydrogen float from exosphere into
space.
5. Wind-vane shows the direction of wind.
6. Air moves from high pressure to low pressure.
ANSWERSMCQS
1
2
3
4
5
6
7
8
9
10
A
B
D
C
A
C
A
D
B
A
11
12
13
14
15
16
17
D
A
D
B
A
A
C
FILL IN
THE BLANKS
1. Atmosphere,
2- Oxygen, 3-co2, 4-Thermosphere, 5- rainguage,, 6-Temprature
True/
false
1.False, 2- True,
3- False 4. True, 5- True, 6.-True
1. How does carbon dioxide
create green house effect?
Answer: Crbon dioxide creates greenhouse effect by trapping
the heat radiated from the earth.
2. What is the significance
of greenhouse gas?
Answer: Without the greenhouse gas the earth would have been
too cold to line in.
3. What happens when air is
heated?
Answer: When air is heated, it expands, becomes lighter and goes
up.
4. What is the nature of
cold air?
Ans. It has tendency to go down.
5. Why do green plants use
carbon dioxide? [Imp.]
Answer: Green plants use carbon dioxide to make their food
and release oxygen.
6. What is an important
feature of Stratosphere?
Answer: Stratosphere contains a layer of ozone gas.
7. How is ozone important
for us? [Imp.]
Answer: It protects us from the harmful effect of the sunrays.
8. What is temperature?
Answer: The degree of hotness and coldness of the air is known as
temperature.
9. What is insolation?
Answer: Insolation is the incoming solar energy intercepted
by the earth.
10. Why is there no air
pressure on the moon?
Answer: There is no air on the moon and therefore no air pressure.
11. Where is air pressure
highest?
Answer: Air pressure is highest at the sea level.
12. How does air move?
Answer: Air moves from high pressure areas to low pressure
areas.
13. Name three types of
winds.
Answer:
1.
Permanent winds
2.
Seasonal winds
3.
Local winds.
14. What is the hot
and dry wind of northern planes of India called?
Ans. It is called loo.
Q.15 What is called humidity? [V. Imp.]
Ans. Moisture in the air at any time is called humidity.
Q 16 Why do we feel uncomfortable on a humid day?
Ans. It is because sweat from our body does not evaporate easily.
Q.17 How is the flooding of low lying areas caused? [V. Imp.]
Ans. When trees on hill sides are cut, rainwater flows down the bare
mountains. This causes flooding of low lying areas.
Q.18 Name various forms of precipitation.
Ans.
1.
Rain
2.
Snow
3.
Sleet
4.
Hail
Q.19 How is a wind named?
Ans. A wind is named after the direction from which it
blows.
SHORT ANSWER TYPE QUESTIONS
Q.1 Give an account of the composition of the atmosphere. [V. Imp.]
Ans. Our atmosphere is composed of mainly two gases—nitrogen (78%)
and oxygen (21%). Other gases like carbon dioxide, helium, ozone, orgon and
hydrogen are found in lesser quantities. Apart from these gases, tiny dust
particles are also present in the air.
Q.2 How do Bacteria help plants use nitrogen? [V. Imp.]
Ans. Nitrogen is essential for the survival of the plant. But
plants cannot take nitrogen directly from the air. Bacteria, that live in the
soil and roots of some plants, take nitrogen from the air and change its form
so that plants can use it.
Q.3 How does nature balance our life? What is the result if this balance
is disturbed?[V. Imp.]
Ans. Green plants use carbon dioxide to make their food and release
oxygen. Humans or animals release carbon dioxide. The amount of carbon dioxide
released by humans or animals seems to be equal to the amount used by the
plants which make a perfect balance. But this balance is disturbed by the burning
of fuels, which add billions of tons of carbon dioxide in the atmosphere. As a
result, the increased volume of carbon dioxide is affecting the earth’s weather
and climate.
Q.4 Why is temperature in cities much higher than that of villages ?
Ans. In cities, we find high rise buildings. The concrete and metals in
these buildings and the asaphalt of roads get heated up during the day. This
heat is released during the night.
Another reason is that the crowded high rise buildings of the cities trap the
warm air and thus raise the temperature of the cities.
Q.5 Write a short note on the distribution of air pressure in the
atmosphere. [Imp.]
Ans. Air pressure is the pressure exerted by the weight of air on the
earth’s surface. As we go up the layers of the atmosphere, the pressure falls
rapidly. The air pressure is highest at the sea level and decreases with
height. Horizonally the distribution of air pressure is influenced by the
temperature of the air at a given place. In areas where the temperature is high
the air gets heated and rises. This creates a low-pressure area. In areas
having lower temperature, the air is cold, hence, it is heavy. Heavy air sinks
and creates a high-pressure area.
Q.6 Why do astronauts wear special protective suits when they go to the
moon?
Ans. Astronauts wear special protective space suits filled with air when
they go to the moon. If they did not wear these space suits, the counter
pressure exerted by the body of the astronauts would make the blood vessels
burst. The astronauts would bleed.
Q.7 How is rainfall important for us? What happens when there is excess
rain? [V. Imp.]
Ans. Rainfall is very important for the survival of plants and animals.
It brings fresh water to the earth’s surface. If rainfall is less, there is
water scarcity which sometimes causes drought like situation. If there is
excess rain, floods take place which makes the life of the affected people
miserable.
4. Ionosphere is the part of ……………
5. Amount of rainfall is measured by ………….
6. Insolation influences the distribution of …………….
State whether the given statements are true or
false.1. Hot
air is dense and heavy and cold air is lighter and expands.
2. Without Greenhouse effect earth would have been
too cold to live.
3. Ionosphere contains the ozone layer.
4. Helium and hydrogen float from exosphere into
space.
5. Wind-vane shows the direction of wind.
6. Air moves from high pressure to low pressure.
ANSWERSMCQS
1
2
3
4
5
6
7
8
9
10
A
B
D
C
A
C
A
D
B
A
11
12
13
14
15
16
17
D
A
D
B
A
A
C
FILL IN
THE BLANKS
1. Atmosphere,
2- Oxygen, 3-co2, 4-Thermosphere, 5- rainguage,, 6-Temprature
True/
false
1.False, 2- True,
3- False 4. True, 5- True, 6.-True
1. How does carbon dioxide
create green house effect?
Answer: Crbon dioxide creates greenhouse effect by trapping
the heat radiated from the earth.
2. What is the significance
of greenhouse gas?
Answer: Without the greenhouse gas the earth would have been
too cold to line in.
3. What happens when air is
heated?
Answer: When air is heated, it expands, becomes lighter and goes
up.
4. What is the nature of
cold air?
Ans. It has tendency to go down.
5. Why do green plants use
carbon dioxide? [Imp.]
Answer: Green plants use carbon dioxide to make their food
and release oxygen.
6. What is an important
feature of Stratosphere?
Answer: Stratosphere contains a layer of ozone gas.
7. How is ozone important
for us? [Imp.]
Answer: It protects us from the harmful effect of the sunrays.
8. What is temperature?
Answer: The degree of hotness and coldness of the air is known as
temperature.
9. What is insolation?
Answer: Insolation is the incoming solar energy intercepted
by the earth.
10. Why is there no air
pressure on the moon?
Answer: There is no air on the moon and therefore no air pressure.
11. Where is air pressure
highest?
Answer: Air pressure is highest at the sea level.
12. How does air move?
Answer: Air moves from high pressure areas to low pressure
areas.
13. Name three types of
winds.
Answer:
1.
Permanent winds
2.
Seasonal winds
3.
Local winds.
14. What is the hot
and dry wind of northern planes of India called?
Ans. It is called loo.
Q.15 What is called humidity? [V. Imp.]
Ans. Moisture in the air at any time is called humidity.
Q 16 Why do we feel uncomfortable on a humid day?
Ans. It is because sweat from our body does not evaporate easily.
Q.17 How is the flooding of low lying areas caused? [V. Imp.]
Ans. When trees on hill sides are cut, rainwater flows down the bare
mountains. This causes flooding of low lying areas.
Q.18 Name various forms of precipitation.
Ans.
1.
Rain
2.
Snow
3.
Sleet
4.
Hail
Q.19 How is a wind named?
Ans. A wind is named after the direction from which it
blows.
SHORT ANSWER TYPE QUESTIONS
Q.1 Give an account of the composition of the atmosphere. [V. Imp.]
Ans. Our atmosphere is composed of mainly two gases—nitrogen (78%)
and oxygen (21%). Other gases like carbon dioxide, helium, ozone, orgon and
hydrogen are found in lesser quantities. Apart from these gases, tiny dust
particles are also present in the air.
Q.2 How do Bacteria help plants use nitrogen? [V. Imp.]
Ans. Nitrogen is essential for the survival of the plant. But
plants cannot take nitrogen directly from the air. Bacteria, that live in the
soil and roots of some plants, take nitrogen from the air and change its form
so that plants can use it.
Q.3 How does nature balance our life? What is the result if this balance
is disturbed?[V. Imp.]
Ans. Green plants use carbon dioxide to make their food and release
oxygen. Humans or animals release carbon dioxide. The amount of carbon dioxide
released by humans or animals seems to be equal to the amount used by the
plants which make a perfect balance. But this balance is disturbed by the burning
of fuels, which add billions of tons of carbon dioxide in the atmosphere. As a
result, the increased volume of carbon dioxide is affecting the earth’s weather
and climate.
Q.4 Why is temperature in cities much higher than that of villages ?
Ans. In cities, we find high rise buildings. The concrete and metals in
these buildings and the asaphalt of roads get heated up during the day. This
heat is released during the night.
Another reason is that the crowded high rise buildings of the cities trap the
warm air and thus raise the temperature of the cities.
Q.5 Write a short note on the distribution of air pressure in the
atmosphere. [Imp.]
Ans. Air pressure is the pressure exerted by the weight of air on the
earth’s surface. As we go up the layers of the atmosphere, the pressure falls
rapidly. The air pressure is highest at the sea level and decreases with
height. Horizonally the distribution of air pressure is influenced by the
temperature of the air at a given place. In areas where the temperature is high
the air gets heated and rises. This creates a low-pressure area. In areas
having lower temperature, the air is cold, hence, it is heavy. Heavy air sinks
and creates a high-pressure area.
Q.6 Why do astronauts wear special protective suits when they go to the
moon?
Ans. Astronauts wear special protective space suits filled with air when
they go to the moon. If they did not wear these space suits, the counter
pressure exerted by the body of the astronauts would make the blood vessels
burst. The astronauts would bleed.
Q.7 How is rainfall important for us? What happens when there is excess
rain? [V. Imp.]
Ans. Rainfall is very important for the survival of plants and animals.
It brings fresh water to the earth’s surface. If rainfall is less, there is
water scarcity which sometimes causes drought like situation. If there is
excess rain, floods take place which makes the life of the affected people
miserable.
5. Amount of rainfall is measured by ………….
6. Insolation influences the distribution of …………….
State whether the given statements are true or
false.1. Hot
air is dense and heavy and cold air is lighter and expands.
2. Without Greenhouse effect earth would have been
too cold to live.
3. Ionosphere contains the ozone layer.
4. Helium and hydrogen float from exosphere into
space.
5. Wind-vane shows the direction of wind.
6. Air moves from high pressure to low pressure.
ANSWERSMCQS
1
2
3
4
5
6
7
8
9
10
A
B
D
C
A
C
A
D
B
A
11
12
13
14
15
16
17
D
A
D
B
A
A
C
FILL IN
THE BLANKS
1. Atmosphere,
2- Oxygen, 3-co2, 4-Thermosphere, 5- rainguage,, 6-Temprature
True/
false
1.False, 2- True,
3- False 4. True, 5- True, 6.-True
1. How does carbon dioxide
create green house effect?
Answer: Crbon dioxide creates greenhouse effect by trapping
the heat radiated from the earth.
2. What is the significance
of greenhouse gas?
Answer: Without the greenhouse gas the earth would have been
too cold to line in.
3. What happens when air is
heated?
Answer: When air is heated, it expands, becomes lighter and goes
up.
4. What is the nature of
cold air?
Ans. It has tendency to go down.
5. Why do green plants use
carbon dioxide? [Imp.]
Answer: Green plants use carbon dioxide to make their food
and release oxygen.
6. What is an important
feature of Stratosphere?
Answer: Stratosphere contains a layer of ozone gas.
7. How is ozone important
for us? [Imp.]
Answer: It protects us from the harmful effect of the sunrays.
8. What is temperature?
Answer: The degree of hotness and coldness of the air is known as
temperature.
9. What is insolation?
Answer: Insolation is the incoming solar energy intercepted
by the earth.
10. Why is there no air
pressure on the moon?
Answer: There is no air on the moon and therefore no air pressure.
11. Where is air pressure
highest?
Answer: Air pressure is highest at the sea level.
12. How does air move?
Answer: Air moves from high pressure areas to low pressure
areas.
13. Name three types of
winds.
Answer:
1.
Permanent winds
2.
Seasonal winds
3.
Local winds.
14. What is the hot
and dry wind of northern planes of India called?
Ans. It is called loo.
Q.15 What is called humidity? [V. Imp.]
Ans. Moisture in the air at any time is called humidity.
Q 16 Why do we feel uncomfortable on a humid day?
Ans. It is because sweat from our body does not evaporate easily.
Q.17 How is the flooding of low lying areas caused? [V. Imp.]
Ans. When trees on hill sides are cut, rainwater flows down the bare
mountains. This causes flooding of low lying areas.
Q.18 Name various forms of precipitation.
Ans.
1.
Rain
2.
Snow
3.
Sleet
4.
Hail
Q.19 How is a wind named?
Ans. A wind is named after the direction from which it
blows.
SHORT ANSWER TYPE QUESTIONS
Q.1 Give an account of the composition of the atmosphere. [V. Imp.]
Ans. Our atmosphere is composed of mainly two gases—nitrogen (78%)
and oxygen (21%). Other gases like carbon dioxide, helium, ozone, orgon and
hydrogen are found in lesser quantities. Apart from these gases, tiny dust
particles are also present in the air.
Q.2 How do Bacteria help plants use nitrogen? [V. Imp.]
Ans. Nitrogen is essential for the survival of the plant. But
plants cannot take nitrogen directly from the air. Bacteria, that live in the
soil and roots of some plants, take nitrogen from the air and change its form
so that plants can use it.
Q.3 How does nature balance our life? What is the result if this balance
is disturbed?[V. Imp.]
Ans. Green plants use carbon dioxide to make their food and release
oxygen. Humans or animals release carbon dioxide. The amount of carbon dioxide
released by humans or animals seems to be equal to the amount used by the
plants which make a perfect balance. But this balance is disturbed by the burning
of fuels, which add billions of tons of carbon dioxide in the atmosphere. As a
result, the increased volume of carbon dioxide is affecting the earth’s weather
and climate.
Q.4 Why is temperature in cities much higher than that of villages ?
Ans. In cities, we find high rise buildings. The concrete and metals in
these buildings and the asaphalt of roads get heated up during the day. This
heat is released during the night.
Another reason is that the crowded high rise buildings of the cities trap the
warm air and thus raise the temperature of the cities.
Q.5 Write a short note on the distribution of air pressure in the
atmosphere. [Imp.]
Ans. Air pressure is the pressure exerted by the weight of air on the
earth’s surface. As we go up the layers of the atmosphere, the pressure falls
rapidly. The air pressure is highest at the sea level and decreases with
height. Horizonally the distribution of air pressure is influenced by the
temperature of the air at a given place. In areas where the temperature is high
the air gets heated and rises. This creates a low-pressure area. In areas
having lower temperature, the air is cold, hence, it is heavy. Heavy air sinks
and creates a high-pressure area.
Q.6 Why do astronauts wear special protective suits when they go to the
moon?
Ans. Astronauts wear special protective space suits filled with air when
they go to the moon. If they did not wear these space suits, the counter
pressure exerted by the body of the astronauts would make the blood vessels
burst. The astronauts would bleed.
Q.7 How is rainfall important for us? What happens when there is excess
rain? [V. Imp.]
Ans. Rainfall is very important for the survival of plants and animals.
It brings fresh water to the earth’s surface. If rainfall is less, there is
water scarcity which sometimes causes drought like situation. If there is
excess rain, floods take place which makes the life of the affected people
miserable.
6. Insolation influences the distribution of …………….
State whether the given statements are true or
false.1. Hot
air is dense and heavy and cold air is lighter and expands.
2. Without Greenhouse effect earth would have been
too cold to live.
3. Ionosphere contains the ozone layer.
4. Helium and hydrogen float from exosphere into
space.
5. Wind-vane shows the direction of wind.
6. Air moves from high pressure to low pressure.
ANSWERSMCQS
1
2
3
4
5
6
7
8
9
10
A
B
D
C
A
C
A
D
B
A
11
12
13
14
15
16
17
D
A
D
B
A
A
C
FILL IN
THE BLANKS
1. Atmosphere,
2- Oxygen, 3-co2, 4-Thermosphere, 5- rainguage,, 6-Temprature
True/
false
1.False, 2- True,
3- False 4. True, 5- True, 6.-True
1. How does carbon dioxide
create green house effect?
Answer: Crbon dioxide creates greenhouse effect by trapping
the heat radiated from the earth.
2. What is the significance
of greenhouse gas?
Answer: Without the greenhouse gas the earth would have been
too cold to line in.
3. What happens when air is
heated?
Answer: When air is heated, it expands, becomes lighter and goes
up.
4. What is the nature of
cold air?
Ans. It has tendency to go down.
5. Why do green plants use
carbon dioxide? [Imp.]
Answer: Green plants use carbon dioxide to make their food
and release oxygen.
6. What is an important
feature of Stratosphere?
Answer: Stratosphere contains a layer of ozone gas.
7. How is ozone important
for us? [Imp.]
Answer: It protects us from the harmful effect of the sunrays.
8. What is temperature?
Answer: The degree of hotness and coldness of the air is known as
temperature.
9. What is insolation?
Answer: Insolation is the incoming solar energy intercepted
by the earth.
10. Why is there no air
pressure on the moon?
Answer: There is no air on the moon and therefore no air pressure.
11. Where is air pressure
highest?
Answer: Air pressure is highest at the sea level.
12. How does air move?
Answer: Air moves from high pressure areas to low pressure
areas.
13. Name three types of
winds.
Answer:
1.
Permanent winds
2.
Seasonal winds
3.
Local winds.
14. What is the hot
and dry wind of northern planes of India called?
Ans. It is called loo.
Q.15 What is called humidity? [V. Imp.]
Ans. Moisture in the air at any time is called humidity.
Q 16 Why do we feel uncomfortable on a humid day?
Ans. It is because sweat from our body does not evaporate easily.
Q.17 How is the flooding of low lying areas caused? [V. Imp.]
Ans. When trees on hill sides are cut, rainwater flows down the bare
mountains. This causes flooding of low lying areas.
Q.18 Name various forms of precipitation.
Ans.
1.
Rain
2.
Snow
3.
Sleet
4.
Hail
Q.19 How is a wind named?
Ans. A wind is named after the direction from which it
blows.
SHORT ANSWER TYPE QUESTIONS
Q.1 Give an account of the composition of the atmosphere. [V. Imp.]
Ans. Our atmosphere is composed of mainly two gases—nitrogen (78%)
and oxygen (21%). Other gases like carbon dioxide, helium, ozone, orgon and
hydrogen are found in lesser quantities. Apart from these gases, tiny dust
particles are also present in the air.
Q.2 How do Bacteria help plants use nitrogen? [V. Imp.]
Ans. Nitrogen is essential for the survival of the plant. But
plants cannot take nitrogen directly from the air. Bacteria, that live in the
soil and roots of some plants, take nitrogen from the air and change its form
so that plants can use it.
Q.3 How does nature balance our life? What is the result if this balance
is disturbed?[V. Imp.]
Ans. Green plants use carbon dioxide to make their food and release
oxygen. Humans or animals release carbon dioxide. The amount of carbon dioxide
released by humans or animals seems to be equal to the amount used by the
plants which make a perfect balance. But this balance is disturbed by the burning
of fuels, which add billions of tons of carbon dioxide in the atmosphere. As a
result, the increased volume of carbon dioxide is affecting the earth’s weather
and climate.
Q.4 Why is temperature in cities much higher than that of villages ?
Ans. In cities, we find high rise buildings. The concrete and metals in
these buildings and the asaphalt of roads get heated up during the day. This
heat is released during the night.
Another reason is that the crowded high rise buildings of the cities trap the
warm air and thus raise the temperature of the cities.
Q.5 Write a short note on the distribution of air pressure in the
atmosphere. [Imp.]
Ans. Air pressure is the pressure exerted by the weight of air on the
earth’s surface. As we go up the layers of the atmosphere, the pressure falls
rapidly. The air pressure is highest at the sea level and decreases with
height. Horizonally the distribution of air pressure is influenced by the
temperature of the air at a given place. In areas where the temperature is high
the air gets heated and rises. This creates a low-pressure area. In areas
having lower temperature, the air is cold, hence, it is heavy. Heavy air sinks
and creates a high-pressure area.
Q.6 Why do astronauts wear special protective suits when they go to the
moon?
Ans. Astronauts wear special protective space suits filled with air when
they go to the moon. If they did not wear these space suits, the counter
pressure exerted by the body of the astronauts would make the blood vessels
burst. The astronauts would bleed.
Q.7 How is rainfall important for us? What happens when there is excess
rain? [V. Imp.]
Ans. Rainfall is very important for the survival of plants and animals.
It brings fresh water to the earth’s surface. If rainfall is less, there is
water scarcity which sometimes causes drought like situation. If there is
excess rain, floods take place which makes the life of the affected people
miserable.
State whether the given statements are true or
false.1. Hot
air is dense and heavy and cold air is lighter and expands.
2. Without Greenhouse effect earth would have been
too cold to live.
3. Ionosphere contains the ozone layer.
4. Helium and hydrogen float from exosphere into
space.
5. Wind-vane shows the direction of wind.
6. Air moves from high pressure to low pressure.
ANSWERSMCQS
1
2
3
4
5
6
7
8
9
10
A
B
D
C
A
C
A
D
B
A
11
12
13
14
15
16
17
D
A
D
B
A
A
C
FILL IN
THE BLANKS
1. Atmosphere,
2- Oxygen, 3-co2, 4-Thermosphere, 5- rainguage,, 6-Temprature
True/
false
1.False, 2- True,
3- False 4. True, 5- True, 6.-True
1. How does carbon dioxide
create green house effect?
Answer: Crbon dioxide creates greenhouse effect by trapping
the heat radiated from the earth.
2. What is the significance
of greenhouse gas?
Answer: Without the greenhouse gas the earth would have been
too cold to line in.
3. What happens when air is
heated?
Answer: When air is heated, it expands, becomes lighter and goes
up.
4. What is the nature of
cold air?
Ans. It has tendency to go down.
5. Why do green plants use
carbon dioxide? [Imp.]
Answer: Green plants use carbon dioxide to make their food
and release oxygen.
6. What is an important
feature of Stratosphere?
Answer: Stratosphere contains a layer of ozone gas.
7. How is ozone important
for us? [Imp.]
Answer: It protects us from the harmful effect of the sunrays.
8. What is temperature?
Answer: The degree of hotness and coldness of the air is known as
temperature.
9. What is insolation?
Answer: Insolation is the incoming solar energy intercepted
by the earth.
10. Why is there no air
pressure on the moon?
Answer: There is no air on the moon and therefore no air pressure.
11. Where is air pressure
highest?
Answer: Air pressure is highest at the sea level.
12. How does air move?
Answer: Air moves from high pressure areas to low pressure
areas.
13. Name three types of
winds.
Answer:
1.
Permanent winds
2.
Seasonal winds
3.
Local winds.
14. What is the hot
and dry wind of northern planes of India called?
Ans. It is called loo.
Q.15 What is called humidity? [V. Imp.]
Ans. Moisture in the air at any time is called humidity.
Q 16 Why do we feel uncomfortable on a humid day?
Ans. It is because sweat from our body does not evaporate easily.
Q.17 How is the flooding of low lying areas caused? [V. Imp.]
Ans. When trees on hill sides are cut, rainwater flows down the bare
mountains. This causes flooding of low lying areas.
Q.18 Name various forms of precipitation.
Ans.
1.
Rain
2.
Snow
3.
Sleet
4.
Hail
Q.19 How is a wind named?
Ans. A wind is named after the direction from which it
blows.
SHORT ANSWER TYPE QUESTIONS
Q.1 Give an account of the composition of the atmosphere. [V. Imp.]
Ans. Our atmosphere is composed of mainly two gases—nitrogen (78%)
and oxygen (21%). Other gases like carbon dioxide, helium, ozone, orgon and
hydrogen are found in lesser quantities. Apart from these gases, tiny dust
particles are also present in the air.
Q.2 How do Bacteria help plants use nitrogen? [V. Imp.]
Ans. Nitrogen is essential for the survival of the plant. But
plants cannot take nitrogen directly from the air. Bacteria, that live in the
soil and roots of some plants, take nitrogen from the air and change its form
so that plants can use it.
Q.3 How does nature balance our life? What is the result if this balance
is disturbed?[V. Imp.]
Ans. Green plants use carbon dioxide to make their food and release
oxygen. Humans or animals release carbon dioxide. The amount of carbon dioxide
released by humans or animals seems to be equal to the amount used by the
plants which make a perfect balance. But this balance is disturbed by the burning
of fuels, which add billions of tons of carbon dioxide in the atmosphere. As a
result, the increased volume of carbon dioxide is affecting the earth’s weather
and climate.
Q.4 Why is temperature in cities much higher than that of villages ?
Ans. In cities, we find high rise buildings. The concrete and metals in
these buildings and the asaphalt of roads get heated up during the day. This
heat is released during the night.
Another reason is that the crowded high rise buildings of the cities trap the
warm air and thus raise the temperature of the cities.
Q.5 Write a short note on the distribution of air pressure in the
atmosphere. [Imp.]
Ans. Air pressure is the pressure exerted by the weight of air on the
earth’s surface. As we go up the layers of the atmosphere, the pressure falls
rapidly. The air pressure is highest at the sea level and decreases with
height. Horizonally the distribution of air pressure is influenced by the
temperature of the air at a given place. In areas where the temperature is high
the air gets heated and rises. This creates a low-pressure area. In areas
having lower temperature, the air is cold, hence, it is heavy. Heavy air sinks
and creates a high-pressure area.
Q.6 Why do astronauts wear special protective suits when they go to the
moon?
Ans. Astronauts wear special protective space suits filled with air when
they go to the moon. If they did not wear these space suits, the counter
pressure exerted by the body of the astronauts would make the blood vessels
burst. The astronauts would bleed.
Q.7 How is rainfall important for us? What happens when there is excess
rain? [V. Imp.]
Ans. Rainfall is very important for the survival of plants and animals.
It brings fresh water to the earth’s surface. If rainfall is less, there is
water scarcity which sometimes causes drought like situation. If there is
excess rain, floods take place which makes the life of the affected people
miserable.
2. Without Greenhouse effect earth would have been
too cold to live.
3. Ionosphere contains the ozone layer.
4. Helium and hydrogen float from exosphere into
space.
5. Wind-vane shows the direction of wind.
6. Air moves from high pressure to low pressure.
ANSWERSMCQS
1
2
3
4
5
6
7
8
9
10
A
B
D
C
A
C
A
D
B
A
11
12
13
14
15
16
17
D
A
D
B
A
A
C
FILL IN
THE BLANKS
1. Atmosphere,
2- Oxygen, 3-co2, 4-Thermosphere, 5- rainguage,, 6-Temprature
True/
false
1.False, 2- True,
3- False 4. True, 5- True, 6.-True
1. How does carbon dioxide
create green house effect?
Answer: Crbon dioxide creates greenhouse effect by trapping
the heat radiated from the earth.
2. What is the significance
of greenhouse gas?
Answer: Without the greenhouse gas the earth would have been
too cold to line in.
3. What happens when air is
heated?
Answer: When air is heated, it expands, becomes lighter and goes
up.
4. What is the nature of
cold air?
Ans. It has tendency to go down.
5. Why do green plants use
carbon dioxide? [Imp.]
Answer: Green plants use carbon dioxide to make their food
and release oxygen.
6. What is an important
feature of Stratosphere?
Answer: Stratosphere contains a layer of ozone gas.
7. How is ozone important
for us? [Imp.]
Answer: It protects us from the harmful effect of the sunrays.
8. What is temperature?
Answer: The degree of hotness and coldness of the air is known as
temperature.
9. What is insolation?
Answer: Insolation is the incoming solar energy intercepted
by the earth.
10. Why is there no air
pressure on the moon?
Answer: There is no air on the moon and therefore no air pressure.
11. Where is air pressure
highest?
Answer: Air pressure is highest at the sea level.
12. How does air move?
Answer: Air moves from high pressure areas to low pressure
areas.
13. Name three types of
winds.
Answer:
1.
Permanent winds
2.
Seasonal winds
3.
Local winds.
14. What is the hot
and dry wind of northern planes of India called?
Ans. It is called loo.
Q.15 What is called humidity? [V. Imp.]
Ans. Moisture in the air at any time is called humidity.
Q 16 Why do we feel uncomfortable on a humid day?
Ans. It is because sweat from our body does not evaporate easily.
Q.17 How is the flooding of low lying areas caused? [V. Imp.]
Ans. When trees on hill sides are cut, rainwater flows down the bare
mountains. This causes flooding of low lying areas.
Q.18 Name various forms of precipitation.
Ans.
1.
Rain
2.
Snow
3.
Sleet
4.
Hail
Q.19 How is a wind named?
Ans. A wind is named after the direction from which it
blows.
SHORT ANSWER TYPE QUESTIONS
Q.1 Give an account of the composition of the atmosphere. [V. Imp.]
Ans. Our atmosphere is composed of mainly two gases—nitrogen (78%)
and oxygen (21%). Other gases like carbon dioxide, helium, ozone, orgon and
hydrogen are found in lesser quantities. Apart from these gases, tiny dust
particles are also present in the air.
Q.2 How do Bacteria help plants use nitrogen? [V. Imp.]
Ans. Nitrogen is essential for the survival of the plant. But
plants cannot take nitrogen directly from the air. Bacteria, that live in the
soil and roots of some plants, take nitrogen from the air and change its form
so that plants can use it.
Q.3 How does nature balance our life? What is the result if this balance
is disturbed?[V. Imp.]
Ans. Green plants use carbon dioxide to make their food and release
oxygen. Humans or animals release carbon dioxide. The amount of carbon dioxide
released by humans or animals seems to be equal to the amount used by the
plants which make a perfect balance. But this balance is disturbed by the burning
of fuels, which add billions of tons of carbon dioxide in the atmosphere. As a
result, the increased volume of carbon dioxide is affecting the earth’s weather
and climate.
Q.4 Why is temperature in cities much higher than that of villages ?
Ans. In cities, we find high rise buildings. The concrete and metals in
these buildings and the asaphalt of roads get heated up during the day. This
heat is released during the night.
Another reason is that the crowded high rise buildings of the cities trap the
warm air and thus raise the temperature of the cities.
Q.5 Write a short note on the distribution of air pressure in the
atmosphere. [Imp.]
Ans. Air pressure is the pressure exerted by the weight of air on the
earth’s surface. As we go up the layers of the atmosphere, the pressure falls
rapidly. The air pressure is highest at the sea level and decreases with
height. Horizonally the distribution of air pressure is influenced by the
temperature of the air at a given place. In areas where the temperature is high
the air gets heated and rises. This creates a low-pressure area. In areas
having lower temperature, the air is cold, hence, it is heavy. Heavy air sinks
and creates a high-pressure area.
Q.6 Why do astronauts wear special protective suits when they go to the
moon?
Ans. Astronauts wear special protective space suits filled with air when
they go to the moon. If they did not wear these space suits, the counter
pressure exerted by the body of the astronauts would make the blood vessels
burst. The astronauts would bleed.
Q.7 How is rainfall important for us? What happens when there is excess
rain? [V. Imp.]
Ans. Rainfall is very important for the survival of plants and animals.
It brings fresh water to the earth’s surface. If rainfall is less, there is
water scarcity which sometimes causes drought like situation. If there is
excess rain, floods take place which makes the life of the affected people
miserable.
3. Ionosphere contains the ozone layer.
4. Helium and hydrogen float from exosphere into
space.
5. Wind-vane shows the direction of wind.
6. Air moves from high pressure to low pressure.
ANSWERSMCQS
1
2
3
4
5
6
7
8
9
10
A
B
D
C
A
C
A
D
B
A
11
12
13
14
15
16
17
D
A
D
B
A
A
C
FILL IN
THE BLANKS
1. Atmosphere,
2- Oxygen, 3-co2, 4-Thermosphere, 5- rainguage,, 6-Temprature
True/
false
1.False, 2- True,
3- False 4. True, 5- True, 6.-True
1. How does carbon dioxide
create green house effect?
Answer: Crbon dioxide creates greenhouse effect by trapping
the heat radiated from the earth.
2. What is the significance
of greenhouse gas?
Answer: Without the greenhouse gas the earth would have been
too cold to line in.
3. What happens when air is
heated?
Answer: When air is heated, it expands, becomes lighter and goes
up.
4. What is the nature of
cold air?
Ans. It has tendency to go down.
5. Why do green plants use
carbon dioxide? [Imp.]
Answer: Green plants use carbon dioxide to make their food
and release oxygen.
6. What is an important
feature of Stratosphere?
Answer: Stratosphere contains a layer of ozone gas.
7. How is ozone important
for us? [Imp.]
Answer: It protects us from the harmful effect of the sunrays.
8. What is temperature?
Answer: The degree of hotness and coldness of the air is known as
temperature.
9. What is insolation?
Answer: Insolation is the incoming solar energy intercepted
by the earth.
10. Why is there no air
pressure on the moon?
Answer: There is no air on the moon and therefore no air pressure.
11. Where is air pressure
highest?
Answer: Air pressure is highest at the sea level.
12. How does air move?
Answer: Air moves from high pressure areas to low pressure
areas.
13. Name three types of
winds.
Answer:
1.
Permanent winds
2.
Seasonal winds
3.
Local winds.
14. What is the hot
and dry wind of northern planes of India called?
Ans. It is called loo.
Q.15 What is called humidity? [V. Imp.]
Ans. Moisture in the air at any time is called humidity.
Q 16 Why do we feel uncomfortable on a humid day?
Ans. It is because sweat from our body does not evaporate easily.
Q.17 How is the flooding of low lying areas caused? [V. Imp.]
Ans. When trees on hill sides are cut, rainwater flows down the bare
mountains. This causes flooding of low lying areas.
Q.18 Name various forms of precipitation.
Ans.
1.
Rain
2.
Snow
3.
Sleet
4.
Hail
Q.19 How is a wind named?
Ans. A wind is named after the direction from which it
blows.
SHORT ANSWER TYPE QUESTIONS
Q.1 Give an account of the composition of the atmosphere. [V. Imp.]
Ans. Our atmosphere is composed of mainly two gases—nitrogen (78%)
and oxygen (21%). Other gases like carbon dioxide, helium, ozone, orgon and
hydrogen are found in lesser quantities. Apart from these gases, tiny dust
particles are also present in the air.
Q.2 How do Bacteria help plants use nitrogen? [V. Imp.]
Ans. Nitrogen is essential for the survival of the plant. But
plants cannot take nitrogen directly from the air. Bacteria, that live in the
soil and roots of some plants, take nitrogen from the air and change its form
so that plants can use it.
Q.3 How does nature balance our life? What is the result if this balance
is disturbed?[V. Imp.]
Ans. Green plants use carbon dioxide to make their food and release
oxygen. Humans or animals release carbon dioxide. The amount of carbon dioxide
released by humans or animals seems to be equal to the amount used by the
plants which make a perfect balance. But this balance is disturbed by the burning
of fuels, which add billions of tons of carbon dioxide in the atmosphere. As a
result, the increased volume of carbon dioxide is affecting the earth’s weather
and climate.
Q.4 Why is temperature in cities much higher than that of villages ?
Ans. In cities, we find high rise buildings. The concrete and metals in
these buildings and the asaphalt of roads get heated up during the day. This
heat is released during the night.
Another reason is that the crowded high rise buildings of the cities trap the
warm air and thus raise the temperature of the cities.
Q.5 Write a short note on the distribution of air pressure in the
atmosphere. [Imp.]
Ans. Air pressure is the pressure exerted by the weight of air on the
earth’s surface. As we go up the layers of the atmosphere, the pressure falls
rapidly. The air pressure is highest at the sea level and decreases with
height. Horizonally the distribution of air pressure is influenced by the
temperature of the air at a given place. In areas where the temperature is high
the air gets heated and rises. This creates a low-pressure area. In areas
having lower temperature, the air is cold, hence, it is heavy. Heavy air sinks
and creates a high-pressure area.
Q.6 Why do astronauts wear special protective suits when they go to the
moon?
Ans. Astronauts wear special protective space suits filled with air when
they go to the moon. If they did not wear these space suits, the counter
pressure exerted by the body of the astronauts would make the blood vessels
burst. The astronauts would bleed.
Q.7 How is rainfall important for us? What happens when there is excess
rain? [V. Imp.]
Ans. Rainfall is very important for the survival of plants and animals.
It brings fresh water to the earth’s surface. If rainfall is less, there is
water scarcity which sometimes causes drought like situation. If there is
excess rain, floods take place which makes the life of the affected people
miserable.
4. Helium and hydrogen float from exosphere into
space.
5. Wind-vane shows the direction of wind.
6. Air moves from high pressure to low pressure.
ANSWERSMCQS
1
2
3
4
5
6
7
8
9
10
A
B
D
C
A
C
A
D
B
A
11
12
13
14
15
16
17
D
A
D
B
A
A
C
FILL IN
THE BLANKS
1. Atmosphere,
2- Oxygen, 3-co2, 4-Thermosphere, 5- rainguage,, 6-Temprature
True/
false
1.False, 2- True,
3- False 4. True, 5- True, 6.-True
1. How does carbon dioxide
create green house effect?
Answer: Crbon dioxide creates greenhouse effect by trapping
the heat radiated from the earth.
2. What is the significance
of greenhouse gas?
Answer: Without the greenhouse gas the earth would have been
too cold to line in.
3. What happens when air is
heated?
Answer: When air is heated, it expands, becomes lighter and goes
up.
4. What is the nature of
cold air?
Ans. It has tendency to go down.
5. Why do green plants use
carbon dioxide? [Imp.]
Answer: Green plants use carbon dioxide to make their food
and release oxygen.
6. What is an important
feature of Stratosphere?
Answer: Stratosphere contains a layer of ozone gas.
7. How is ozone important
for us? [Imp.]
Answer: It protects us from the harmful effect of the sunrays.
8. What is temperature?
Answer: The degree of hotness and coldness of the air is known as
temperature.
9. What is insolation?
Answer: Insolation is the incoming solar energy intercepted
by the earth.
10. Why is there no air
pressure on the moon?
Answer: There is no air on the moon and therefore no air pressure.
11. Where is air pressure
highest?
Answer: Air pressure is highest at the sea level.
12. How does air move?
Answer: Air moves from high pressure areas to low pressure
areas.
13. Name three types of
winds.
Answer:
1.
Permanent winds
2.
Seasonal winds
3.
Local winds.
14. What is the hot
and dry wind of northern planes of India called?
Ans. It is called loo.
Q.15 What is called humidity? [V. Imp.]
Ans. Moisture in the air at any time is called humidity.
Q 16 Why do we feel uncomfortable on a humid day?
Ans. It is because sweat from our body does not evaporate easily.
Q.17 How is the flooding of low lying areas caused? [V. Imp.]
Ans. When trees on hill sides are cut, rainwater flows down the bare
mountains. This causes flooding of low lying areas.
Q.18 Name various forms of precipitation.
Ans.
1.
Rain
2.
Snow
3.
Sleet
4.
Hail
Q.19 How is a wind named?
Ans. A wind is named after the direction from which it
blows.
SHORT ANSWER TYPE QUESTIONS
Q.1 Give an account of the composition of the atmosphere. [V. Imp.]
Ans. Our atmosphere is composed of mainly two gases—nitrogen (78%)
and oxygen (21%). Other gases like carbon dioxide, helium, ozone, orgon and
hydrogen are found in lesser quantities. Apart from these gases, tiny dust
particles are also present in the air.
Q.2 How do Bacteria help plants use nitrogen? [V. Imp.]
Ans. Nitrogen is essential for the survival of the plant. But
plants cannot take nitrogen directly from the air. Bacteria, that live in the
soil and roots of some plants, take nitrogen from the air and change its form
so that plants can use it.
Q.3 How does nature balance our life? What is the result if this balance
is disturbed?[V. Imp.]
Ans. Green plants use carbon dioxide to make their food and release
oxygen. Humans or animals release carbon dioxide. The amount of carbon dioxide
released by humans or animals seems to be equal to the amount used by the
plants which make a perfect balance. But this balance is disturbed by the burning
of fuels, which add billions of tons of carbon dioxide in the atmosphere. As a
result, the increased volume of carbon dioxide is affecting the earth’s weather
and climate.
Q.4 Why is temperature in cities much higher than that of villages ?
Ans. In cities, we find high rise buildings. The concrete and metals in
these buildings and the asaphalt of roads get heated up during the day. This
heat is released during the night.
Another reason is that the crowded high rise buildings of the cities trap the
warm air and thus raise the temperature of the cities.
Q.5 Write a short note on the distribution of air pressure in the
atmosphere. [Imp.]
Ans. Air pressure is the pressure exerted by the weight of air on the
earth’s surface. As we go up the layers of the atmosphere, the pressure falls
rapidly. The air pressure is highest at the sea level and decreases with
height. Horizonally the distribution of air pressure is influenced by the
temperature of the air at a given place. In areas where the temperature is high
the air gets heated and rises. This creates a low-pressure area. In areas
having lower temperature, the air is cold, hence, it is heavy. Heavy air sinks
and creates a high-pressure area.
Q.6 Why do astronauts wear special protective suits when they go to the
moon?
Ans. Astronauts wear special protective space suits filled with air when
they go to the moon. If they did not wear these space suits, the counter
pressure exerted by the body of the astronauts would make the blood vessels
burst. The astronauts would bleed.
Q.7 How is rainfall important for us? What happens when there is excess
rain? [V. Imp.]
Ans. Rainfall is very important for the survival of plants and animals.
It brings fresh water to the earth’s surface. If rainfall is less, there is
water scarcity which sometimes causes drought like situation. If there is
excess rain, floods take place which makes the life of the affected people
miserable.
5. Wind-vane shows the direction of wind.
6. Air moves from high pressure to low pressure.
ANSWERSMCQS
1
2
3
4
5
6
7
8
9
10
A
B
D
C
A
C
A
D
B
A
11
12
13
14
15
16
17
D
A
D
B
A
A
C
FILL IN
THE BLANKS
1. Atmosphere,
2- Oxygen, 3-co2, 4-Thermosphere, 5- rainguage,, 6-Temprature
True/
false
1.False, 2- True,
3- False 4. True, 5- True, 6.-True
1. How does carbon dioxide
create green house effect?
Answer: Crbon dioxide creates greenhouse effect by trapping
the heat radiated from the earth.
2. What is the significance
of greenhouse gas?
Answer: Without the greenhouse gas the earth would have been
too cold to line in.
3. What happens when air is
heated?
Answer: When air is heated, it expands, becomes lighter and goes
up.
4. What is the nature of
cold air?
Ans. It has tendency to go down.
5. Why do green plants use
carbon dioxide? [Imp.]
Answer: Green plants use carbon dioxide to make their food
and release oxygen.
6. What is an important
feature of Stratosphere?
Answer: Stratosphere contains a layer of ozone gas.
7. How is ozone important
for us? [Imp.]
Answer: It protects us from the harmful effect of the sunrays.
8. What is temperature?
Answer: The degree of hotness and coldness of the air is known as
temperature.
9. What is insolation?
Answer: Insolation is the incoming solar energy intercepted
by the earth.
10. Why is there no air
pressure on the moon?
Answer: There is no air on the moon and therefore no air pressure.
11. Where is air pressure
highest?
Answer: Air pressure is highest at the sea level.
12. How does air move?
Answer: Air moves from high pressure areas to low pressure
areas.
13. Name three types of
winds.
Answer:
1.
Permanent winds
2.
Seasonal winds
3.
Local winds.
14. What is the hot
and dry wind of northern planes of India called?
Ans. It is called loo.
Q.15 What is called humidity? [V. Imp.]
Ans. Moisture in the air at any time is called humidity.
Q 16 Why do we feel uncomfortable on a humid day?
Ans. It is because sweat from our body does not evaporate easily.
Q.17 How is the flooding of low lying areas caused? [V. Imp.]
Ans. When trees on hill sides are cut, rainwater flows down the bare
mountains. This causes flooding of low lying areas.
Q.18 Name various forms of precipitation.
Ans.
1.
Rain
2.
Snow
3.
Sleet
4.
Hail
Q.19 How is a wind named?
Ans. A wind is named after the direction from which it
blows.
SHORT ANSWER TYPE QUESTIONS
Q.1 Give an account of the composition of the atmosphere. [V. Imp.]
Ans. Our atmosphere is composed of mainly two gases—nitrogen (78%)
and oxygen (21%). Other gases like carbon dioxide, helium, ozone, orgon and
hydrogen are found in lesser quantities. Apart from these gases, tiny dust
particles are also present in the air.
Q.2 How do Bacteria help plants use nitrogen? [V. Imp.]
Ans. Nitrogen is essential for the survival of the plant. But
plants cannot take nitrogen directly from the air. Bacteria, that live in the
soil and roots of some plants, take nitrogen from the air and change its form
so that plants can use it.
Q.3 How does nature balance our life? What is the result if this balance
is disturbed?[V. Imp.]
Ans. Green plants use carbon dioxide to make their food and release
oxygen. Humans or animals release carbon dioxide. The amount of carbon dioxide
released by humans or animals seems to be equal to the amount used by the
plants which make a perfect balance. But this balance is disturbed by the burning
of fuels, which add billions of tons of carbon dioxide in the atmosphere. As a
result, the increased volume of carbon dioxide is affecting the earth’s weather
and climate.
Q.4 Why is temperature in cities much higher than that of villages ?
Ans. In cities, we find high rise buildings. The concrete and metals in
these buildings and the asaphalt of roads get heated up during the day. This
heat is released during the night.
Another reason is that the crowded high rise buildings of the cities trap the
warm air and thus raise the temperature of the cities.
Q.5 Write a short note on the distribution of air pressure in the
atmosphere. [Imp.]
Ans. Air pressure is the pressure exerted by the weight of air on the
earth’s surface. As we go up the layers of the atmosphere, the pressure falls
rapidly. The air pressure is highest at the sea level and decreases with
height. Horizonally the distribution of air pressure is influenced by the
temperature of the air at a given place. In areas where the temperature is high
the air gets heated and rises. This creates a low-pressure area. In areas
having lower temperature, the air is cold, hence, it is heavy. Heavy air sinks
and creates a high-pressure area.
Q.6 Why do astronauts wear special protective suits when they go to the
moon?
Ans. Astronauts wear special protective space suits filled with air when
they go to the moon. If they did not wear these space suits, the counter
pressure exerted by the body of the astronauts would make the blood vessels
burst. The astronauts would bleed.
Q.7 How is rainfall important for us? What happens when there is excess
rain? [V. Imp.]
Ans. Rainfall is very important for the survival of plants and animals.
It brings fresh water to the earth’s surface. If rainfall is less, there is
water scarcity which sometimes causes drought like situation. If there is
excess rain, floods take place which makes the life of the affected people
miserable.
6. Air moves from high pressure to low pressure.
ANSWERSMCQS
1
2
3
4
5
6
7
8
9
10
A
B
D
C
A
C
A
D
B
A
11
12
13
14
15
16
17
D
A
D
B
A
A
C
FILL IN
THE BLANKS
1. Atmosphere,
2- Oxygen, 3-co2, 4-Thermosphere, 5- rainguage,, 6-Temprature
True/
false
1.False, 2- True,
3- False 4. True, 5- True, 6.-True
1. How does carbon dioxide
create green house effect?
Answer: Crbon dioxide creates greenhouse effect by trapping
the heat radiated from the earth.
2. What is the significance
of greenhouse gas?
Answer: Without the greenhouse gas the earth would have been
too cold to line in.
3. What happens when air is
heated?
Answer: When air is heated, it expands, becomes lighter and goes
up.
4. What is the nature of
cold air?
Ans. It has tendency to go down.
5. Why do green plants use
carbon dioxide? [Imp.]
Answer: Green plants use carbon dioxide to make their food
and release oxygen.
6. What is an important
feature of Stratosphere?
Answer: Stratosphere contains a layer of ozone gas.
7. How is ozone important
for us? [Imp.]
Answer: It protects us from the harmful effect of the sunrays.
8. What is temperature?
Answer: The degree of hotness and coldness of the air is known as
temperature.
9. What is insolation?
Answer: Insolation is the incoming solar energy intercepted
by the earth.
10. Why is there no air
pressure on the moon?
Answer: There is no air on the moon and therefore no air pressure.
11. Where is air pressure
highest?
Answer: Air pressure is highest at the sea level.
12. How does air move?
Answer: Air moves from high pressure areas to low pressure
areas.
13. Name three types of
winds.
Answer:
1.
Permanent winds
2.
Seasonal winds
3.
Local winds.
14. What is the hot
and dry wind of northern planes of India called?
Ans. It is called loo.
Q.15 What is called humidity? [V. Imp.]
Ans. Moisture in the air at any time is called humidity.
Q 16 Why do we feel uncomfortable on a humid day?
Ans. It is because sweat from our body does not evaporate easily.
Q.17 How is the flooding of low lying areas caused? [V. Imp.]
Ans. When trees on hill sides are cut, rainwater flows down the bare
mountains. This causes flooding of low lying areas.
Q.18 Name various forms of precipitation.
Ans.
1.
Rain
2.
Snow
3.
Sleet
4.
Hail
Q.19 How is a wind named?
Ans. A wind is named after the direction from which it
blows.
SHORT ANSWER TYPE QUESTIONS
Q.1 Give an account of the composition of the atmosphere. [V. Imp.]
Ans. Our atmosphere is composed of mainly two gases—nitrogen (78%)
and oxygen (21%). Other gases like carbon dioxide, helium, ozone, orgon and
hydrogen are found in lesser quantities. Apart from these gases, tiny dust
particles are also present in the air.
Q.2 How do Bacteria help plants use nitrogen? [V. Imp.]
Ans. Nitrogen is essential for the survival of the plant. But
plants cannot take nitrogen directly from the air. Bacteria, that live in the
soil and roots of some plants, take nitrogen from the air and change its form
so that plants can use it.
Q.3 How does nature balance our life? What is the result if this balance
is disturbed?[V. Imp.]
Ans. Green plants use carbon dioxide to make their food and release
oxygen. Humans or animals release carbon dioxide. The amount of carbon dioxide
released by humans or animals seems to be equal to the amount used by the
plants which make a perfect balance. But this balance is disturbed by the burning
of fuels, which add billions of tons of carbon dioxide in the atmosphere. As a
result, the increased volume of carbon dioxide is affecting the earth’s weather
and climate.
Q.4 Why is temperature in cities much higher than that of villages ?
Ans. In cities, we find high rise buildings. The concrete and metals in
these buildings and the asaphalt of roads get heated up during the day. This
heat is released during the night.
Another reason is that the crowded high rise buildings of the cities trap the
warm air and thus raise the temperature of the cities.
Q.5 Write a short note on the distribution of air pressure in the
atmosphere. [Imp.]
Ans. Air pressure is the pressure exerted by the weight of air on the
earth’s surface. As we go up the layers of the atmosphere, the pressure falls
rapidly. The air pressure is highest at the sea level and decreases with
height. Horizonally the distribution of air pressure is influenced by the
temperature of the air at a given place. In areas where the temperature is high
the air gets heated and rises. This creates a low-pressure area. In areas
having lower temperature, the air is cold, hence, it is heavy. Heavy air sinks
and creates a high-pressure area.
Q.6 Why do astronauts wear special protective suits when they go to the
moon?
Ans. Astronauts wear special protective space suits filled with air when
they go to the moon. If they did not wear these space suits, the counter
pressure exerted by the body of the astronauts would make the blood vessels
burst. The astronauts would bleed.
Q.7 How is rainfall important for us? What happens when there is excess
rain? [V. Imp.]
Ans. Rainfall is very important for the survival of plants and animals.
It brings fresh water to the earth’s surface. If rainfall is less, there is
water scarcity which sometimes causes drought like situation. If there is
excess rain, floods take place which makes the life of the affected people
miserable.
ANSWERSMCQS
1
2
3
4
5
6
7
8
9
10
A
B
D
C
A
C
A
D
B
A
11
12
13
14
15
16
17
D
A
D
B
A
A
C
FILL IN
THE BLANKS
1. Atmosphere,
2- Oxygen, 3-co2, 4-Thermosphere, 5- rainguage,, 6-Temprature
True/
false
1.False, 2- True,
3- False 4. True, 5- True, 6.-True
1. How does carbon dioxide
create green house effect?
Answer: Crbon dioxide creates greenhouse effect by trapping
the heat radiated from the earth.
2. What is the significance
of greenhouse gas?
Answer: Without the greenhouse gas the earth would have been
too cold to line in.
3. What happens when air is
heated?
Answer: When air is heated, it expands, becomes lighter and goes
up.
4. What is the nature of
cold air?
Ans. It has tendency to go down.
5. Why do green plants use
carbon dioxide? [Imp.]
Answer: Green plants use carbon dioxide to make their food
and release oxygen.
6. What is an important
feature of Stratosphere?
Answer: Stratosphere contains a layer of ozone gas.
7. How is ozone important
for us? [Imp.]
Answer: It protects us from the harmful effect of the sunrays.
8. What is temperature?
Answer: The degree of hotness and coldness of the air is known as
temperature.
9. What is insolation?
Answer: Insolation is the incoming solar energy intercepted
by the earth.
10. Why is there no air
pressure on the moon?
Answer: There is no air on the moon and therefore no air pressure.
11. Where is air pressure
highest?
Answer: Air pressure is highest at the sea level.
12. How does air move?
Answer: Air moves from high pressure areas to low pressure
areas.
13. Name three types of
winds.
Answer:
1.
Permanent winds
2.
Seasonal winds
3.
Local winds.
14. What is the hot
and dry wind of northern planes of India called?
Ans. It is called loo.
Q.15 What is called humidity? [V. Imp.]
Ans. Moisture in the air at any time is called humidity.
Q 16 Why do we feel uncomfortable on a humid day?
Ans. It is because sweat from our body does not evaporate easily.
Q.17 How is the flooding of low lying areas caused? [V. Imp.]
Ans. When trees on hill sides are cut, rainwater flows down the bare
mountains. This causes flooding of low lying areas.
Q.18 Name various forms of precipitation.
Ans.
1.
Rain
2.
Snow
3.
Sleet
4.
Hail
Q.19 How is a wind named?
Ans. A wind is named after the direction from which it
blows.
SHORT ANSWER TYPE QUESTIONS
Q.1 Give an account of the composition of the atmosphere. [V. Imp.]
Ans. Our atmosphere is composed of mainly two gases—nitrogen (78%)
and oxygen (21%). Other gases like carbon dioxide, helium, ozone, orgon and
hydrogen are found in lesser quantities. Apart from these gases, tiny dust
particles are also present in the air.
Q.2 How do Bacteria help plants use nitrogen? [V. Imp.]
Ans. Nitrogen is essential for the survival of the plant. But
plants cannot take nitrogen directly from the air. Bacteria, that live in the
soil and roots of some plants, take nitrogen from the air and change its form
so that plants can use it.
Q.3 How does nature balance our life? What is the result if this balance
is disturbed?[V. Imp.]
Ans. Green plants use carbon dioxide to make their food and release
oxygen. Humans or animals release carbon dioxide. The amount of carbon dioxide
released by humans or animals seems to be equal to the amount used by the
plants which make a perfect balance. But this balance is disturbed by the burning
of fuels, which add billions of tons of carbon dioxide in the atmosphere. As a
result, the increased volume of carbon dioxide is affecting the earth’s weather
and climate.
Q.4 Why is temperature in cities much higher than that of villages ?
Ans. In cities, we find high rise buildings. The concrete and metals in
these buildings and the asaphalt of roads get heated up during the day. This
heat is released during the night.
Another reason is that the crowded high rise buildings of the cities trap the
warm air and thus raise the temperature of the cities.
Q.5 Write a short note on the distribution of air pressure in the
atmosphere. [Imp.]
Ans. Air pressure is the pressure exerted by the weight of air on the
earth’s surface. As we go up the layers of the atmosphere, the pressure falls
rapidly. The air pressure is highest at the sea level and decreases with
height. Horizonally the distribution of air pressure is influenced by the
temperature of the air at a given place. In areas where the temperature is high
the air gets heated and rises. This creates a low-pressure area. In areas
having lower temperature, the air is cold, hence, it is heavy. Heavy air sinks
and creates a high-pressure area.
Q.6 Why do astronauts wear special protective suits when they go to the
moon?
Ans. Astronauts wear special protective space suits filled with air when
they go to the moon. If they did not wear these space suits, the counter
pressure exerted by the body of the astronauts would make the blood vessels
burst. The astronauts would bleed.
Q.7 How is rainfall important for us? What happens when there is excess
rain? [V. Imp.]
Ans. Rainfall is very important for the survival of plants and animals.
It brings fresh water to the earth’s surface. If rainfall is less, there is
water scarcity which sometimes causes drought like situation. If there is
excess rain, floods take place which makes the life of the affected people
miserable.
1
2
3
4
5
6
7
8
9
10
A
B
D
C
A
C
A
D
B
A
11
12
13
14
15
16
17
D
A
D
B
A
A
C
Answer: Crbon dioxide creates greenhouse effect by trapping the heat radiated from the earth.
Answer: Without the greenhouse gas the earth would have been too cold to line in.
Answer: When air is heated, it expands, becomes lighter and goes up.
Ans. It has tendency to go down.
Answer: Green plants use carbon dioxide to make their food and release oxygen.
Answer: Stratosphere contains a layer of ozone gas.
Answer: It protects us from the harmful effect of the sunrays.
Answer: The degree of hotness and coldness of the air is known as temperature.
Answer: Insolation is the incoming solar energy intercepted by the earth.
Answer: There is no air on the moon and therefore no air pressure.
Answer: Air pressure is highest at the sea level.
Answer: Air moves from high pressure areas to low pressure areas.
Answer:
Ans. It is called loo.
Ans. Moisture in the air at any time is called humidity.
Ans. It is because sweat from our body does not evaporate easily.
Ans. When trees on hill sides are cut, rainwater flows down the bare mountains. This causes flooding of low lying areas.
Ans.
Ans. A wind is named after the direction from which it blows.
Ans. Our atmosphere is composed of mainly two gases—nitrogen (78%) and oxygen (21%). Other gases like carbon dioxide, helium, ozone, orgon and hydrogen are found in lesser quantities. Apart from these gases, tiny dust particles are also present in the air.
Ans. Nitrogen is essential for the survival of the plant. But plants cannot take nitrogen directly from the air. Bacteria, that live in the soil and roots of some plants, take nitrogen from the air and change its form so that plants can use it.
Ans. Green plants use carbon dioxide to make their food and release oxygen. Humans or animals release carbon dioxide. The amount of carbon dioxide released by humans or animals seems to be equal to the amount used by the plants which make a perfect balance. But this balance is disturbed by the burning of fuels, which add billions of tons of carbon dioxide in the atmosphere. As a result, the increased volume of carbon dioxide is affecting the earth’s weather and climate.
Ans. In cities, we find high rise buildings. The concrete and metals in these buildings and the asaphalt of roads get heated up during the day. This heat is released during the night.
Another reason is that the crowded high rise buildings of the cities trap the warm air and thus raise the temperature of the cities.
Ans. Air pressure is the pressure exerted by the weight of air on the earth’s surface. As we go up the layers of the atmosphere, the pressure falls rapidly. The air pressure is highest at the sea level and decreases with height. Horizonally the distribution of air pressure is influenced by the temperature of the air at a given place. In areas where the temperature is high the air gets heated and rises. This creates a low-pressure area. In areas having lower temperature, the air is cold, hence, it is heavy. Heavy air sinks and creates a high-pressure area.
Ans. Astronauts wear special protective space suits filled with air when they go to the moon. If they did not wear these space suits, the counter pressure exerted by the body of the astronauts would make the blood vessels burst. The astronauts would bleed.
Ans. Rainfall is very important for the survival of plants and animals. It brings fresh water to the earth’s surface. If rainfall is less, there is water scarcity which sometimes causes drought like situation. If there is excess rain, floods take place which makes the life of the affected people miserable.
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