NCERT Solutions for Class 7 Social Science Our Environment Chapter 4

Air Class 7

Chapter 4 Air Exercise Solutions

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Exercise : Solutions of Questions on Page Number : 27

Q1 :  

Answer the following questions.

(i) What is atmosphere?

(ii) Which two gases make the bulk of the atmosphere?

(iii) Which gas creates greenhouse effect in the atmosphere?

(iv) What is weather?

(v) Name three types of rainfall?

(vi) What is air pressure?


Answer :

(i)The huge blanket of air surrounding the Earth is called atmosphere.

(ii)Nitrogen and oxygen make the bulk of the atmosphere.

(iii)Carbon dioxide creates greenhouse effect in the atmosphere.

(iv)Weather refers to the short-term changes in the atmosphere. It is the hour-to-hour, day-to-day condition of the atmosphere.

(v)Convectional rainfall, orographic rainfall and cyclonic rainfall are the three types of rainfall.

(vi)Air pressure is defined as the pressure exerted by the weight of air on the Earth's surface.

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Q2 :  

Tick the correct answer.

(i) Which of the following gases protects us from harmful sun rays?

(a) Carbon dioxide

(b) Nitrogen

(c) Ozone

(ii) The most important layer of the atmosphere is

(a) Troposphere

(b) Thermosphere

(c) Mesosphere

(iii) Which of the following layers of the atmosphere is free from clouds?

(a) Troposphere

(b) Stratosphere

(c) Mesosphere

(iv) As we go up the layers of the atmosphere, the pressure

(a) Increases

(b) Decreases

(c) Remains the same

(v) When precipitation comes down to the Earth in the liquid form, it is called

(a) Cloud

(b) Rain

(c) Snow


Answer :

(i)Which of the following gases protects us from harmful sun rays?

(a) Carbon dioxide

(b) Nitrogen

(c) Ozone

(ii)The most important layer of the atmosphere is

(a) Troposphere

(b) Thermosphere

(c) Mesosphere

(iii)Which of the following layers of the atmosphere is free from clouds?

(a) Troposphere

(b) Stratosphere

(c) Mesosphere

(iv)As we go up the layers of the atmosphere, the pressure

(a) Increases

(b) Decreases

(c) Remains the same

(v)When precipitation comes down to the Earth in the liquid form, it is called

(a) Cloud

(b) Rain

(c) Snow

Answer needs Correction? Click Here

Q3 :  

Match the following.

(i) Trade Winds

(a) Incoming solar energy

(ii) Loo

(b) Seasonal wind

(iii) Monsoon

(c) Horizontal movement of air

(iv) Wind

(d) Layer of ozone gas

-

(e) Permanent wind

-

(f) Local wind


Answer :

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Q4 :  

Give reasons.

(i) Wet clothes take longer time to dry on a humid day?

(ii) Amount of insolation decreases from Equator towards Poles?


Answer :

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Q5 :  

For fun.

(i) Solve this Crossword puzzle with the help of given clues:

Across

Down

6. An Indian tree having extraordinary

quality of providing oxygen round the

clock

1. Amount of water vapour in air

8. Gas present in atmosphere occupying

only 0.03% by volume

2. Condensation of water vapours around

dust particles in atmosphere

11. Outermost layer of atmosphere

3. Example of local wind blowing in summer in northern India

12. Mixture of many gases

4. Short-term changes in atmosphere

14. Life-giving gas

5. Precipitation in liquid form

15. Air in motion

7. Blanket of air around the Earth

16. An Indian tree valued highly for

medicinal properties

9. Instrument to measure pressure

18. Gas protecting us from harmful sunrays

10. Incoming solar radiation

19. Low pressure area

13. Reduces visibility in winters

-

17. It is ....... time when Sun is overhead

(ii) Make a weather calendar for one week. Use pictures or symbols to show different types of weather. You can use more than one symbol in a day, if the weather changes. For example, the sun comes out when rain stops. An example is given below:

Day

Weather

1.

Sunny day

2.

3.

4.

5.

6.

7.


Answer :

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<< Previous Chapter 3 : Our Changing Earth Next Chapter 5 : Water >>

Our Environment - Social Science : CBSE NCERT Exercise Solutions for Class 7th for Air will be available online in PDF book form soon. The solutions are absolutely Free. Soon you will be able to download the solutions.

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