NCERT Solutions for Class 7 Social Science Geography Chapter 4 Air

/ By

Air Class 7 Questions and Answers Provided helps you to answer complex Questions too easily. You can use them while preparing for board exams and all of them are given by subject experts. Reading NCERT Solutions for Class 7 Social Science Geography Chapter 4 Air familiarizes you with the kind of questions appearing in the board exams. Students are advised to read these solutions on a regular basis to score well.

Air Class 7 Questions and Answers Geography Chapter 4

Make your learning experience enjoyable by preparing from the quick links available on this page. Use the Class 7 SST Geography Chapter 4 NCERT Solutions and get to know different concepts involved. All the Solutions are covered as per the latest syllabus guidelines. Knowing the NCERT Class 7 Geography Chapter 4 Questions and Answers helps students to attempt the exam with confidence.

Class 7 Geography Chapter 4 NCERT Textbook Questions and Answers

Question 1.
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) Our earth is surrounded by a huge blanket of air called atmosphere. All living beings on this earth depend on the atmosphere for their survival.
(ii) Nitrogen and Oxygen make the bulk of the atmosphere. The amount of both gases together is 99% in the atmosphere.
(iii) Carbon dioxide gas creates greenhouse effect in the atmosphere.
(iv) Hour-to-hour, day-to-day condition of the atmosphere is called weather.
(v) Three types of rainfall are:

  • Convectional rainfall
  • Orographic rainfall
  • Cyclonic rainfall

(vi) The pressure exerted by the weight of air on the earth’s surface is known as air pressure.

Question 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) Ozone

(ii) The most important layer of the atmosphere is:
(a) Troposphere
(b) Thermosphere
(c) Mesosphere
Answer:
(a) Troposphere

(iii) Which of the following layers of the atmosphere is free from clouds?
(a) Troposphere
(b) Stratosphere
(c) Mesosphere
Answer:
(b) Stratosphere

(iv) As we go up the layers of the atmosphere, the pressure:
(a) Increases
(b) Decreases
(c) Remains the same
Answer:
(b) Decreases

(v) When precipitation comes down to the earth in the liquid form:
(a) Cloud
(b) Rain
(c) Snow
Answer:
(b) Rain

Question 3.
Match the following.

Column I Column II
1. Trade Winds (a) Permanent wind
2. Loo (b) Local wind
3. Monsoon (c) Seasonal wind
4. Wind (d) Horizontal movement of air

Answer:
1. (c)
2. (d)
3. (a)
4. (b)

Question 4.
Give Reasons.
Answer:
(i) Wet clothes take longer time to dry on a humid day.
(ii) Amount of insolation decreases from equator towards poles.

Answer:
(i) On a humid day, evaporation from wet clothes takes place slowly due to low temperature. Hence, wet clothes take longer time to dry on a humid day.
(ii) Insolation comes through vertical rays on equator. As we go up from equator towards poles, the sun rays become slanting. The slanting rays take up more space; the degree of hotness is felt less. Hence the amount of insolation decreases from equator towards poles.

Question 5.
For fun.
(i) Solve this Crossword puzzle with the help of given clues:
NCERT Solutions for Class 7 Social Science Geography Chapter 4 Air 1

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

Hints

  1. Humidity
  2. Cloud
  3. Loo
  4. Weather
  5. Rain
  6. Peepal
  7. Atmosphere
  8. Carbon Dioxide
  9. Barometer
  10. Insolation
  11. Exosphere
  12. Air
  13. Fog
  14. Oxygen
  15. Wind
  16. Neem
  17. Noon
  18. Ozone
  19. Cyclone

(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:
NCERT Solutions for Class 7 Social Science Geography Chapter 4 Air 2NCERT Solutions for Class 7 Social Science Geography Chapter 4 Air 3

Hope the data shared above regarding the NCERT Class 7 Social Science Geography Chapter 4 Air PDF has aided in your exam preparation. If you ever need any assistance you can always reach us and our team will guide you at the soonest possibility.

error: Content is protected !!