NCERT Solutions for Class 7 Social Science Geography Chapter 4 Air are part of NCERT Solutions for Class 7 Social Science. Here we have given NCERT Solutions for Class 7 Social Science Geography Chapter 4 Air.

Board CBSE
Textbook NCERT
Class Class 7
Subject Social Science Geography
Chapter Chapter 4
Chapter Name Air
Number of Questions Solved 6
Category NCERT Solutions

NCERT Solutions for Class 7 Social Science Geography Chapter 4 Air

NCERT TEXTBOOK EXERCISES

Question 1.
Answer the following questions.

  1. What is the atmosphere?
  2. Which two gases make the hulk of the atmosphere?
  3. Which gas creates the greenhouse effect in the atmosphere?
  4. What is the weather?
  5. Name three types of rainfall?
  6. What is air pressure?

Answer.

  1. The atmosphere is the blanket of air that surrounds the earth.
    • Nitrogen
    • Oxygen
  2. Carbon dioxide
  3. Weather is the total of atmospheric conditions of a specific place, at a specific time, regarding temperature, humidity, air pressure, clouds, winds etc.
  4. Three types of rainfall are:
    • Cyclonic or Frontal rainfall.
    • Orographic rainfall
    • Convectional rainfall
  5. NCERT Solutions for Class 7 Social Science Geography Chapter 4 Air 1
  6. Air pressure: Air has weight and exerts pressure. Hence, air pressure is an impact which occurs due to air weight.

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, it is called
(a) Cloud
(b) Rain
(c) Snow
Answer.
(b) Rain.

Question 3.
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.
(i) Trade                                   (e) Permanent wind
(ii) Loo                                     (f) Local wind
(iii) Monsoon                           (b) Seasonal wind
(iv) Wind                                  (c) Horizontal movement of Air

Question 4.
Give reasons.

  1. Wet clothes take a longer time to dry on a humid day?
  2. Amount of insolation decreases from the equator towards the poles?

Answer.
1. Because on a humid day, there is more water in the air than on a sunny day. So, air can soak less water from wet clothes, i.e. rate of evaporation decreases.

2. Because sun rays fall vertical on the equator while slanting on the 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 2
Across
6. An Indian tree having the extraordinary quality of providing oxygen round the clock.
8. Gas present in the atmosphere occupying only 0.03% by volume.
11. Outermost layer of the atmosphere.
12. Mixture of many gases.
14. Life-giving gas.
15. Air in motion.
16. An Indian tree valued highly for medicinal properties.
18. Gas protecting us from harmful sun rays.
19. Low-pressure area.
Down
1. Amount of water vapour in the air.
2. Condensation of water vapours around dust particles in the atmosphere.
3. Example of local wind blowing in summer in northern India.
4. Short-term changes in the atmosphere.
5. Precipitation in liquid form.
7. Blanket of air around the earth.
9. Instrument to measure pressure.
10. Incoming solar radiation.
13. Reduces visibility in winters.
17. It is a time when the sun is overhead.
Answer.
NCERT Solutions for Class 7 Social Science Geography Chapter 4 Air 3
(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 the rain stops. An example is given below:
NCERT Solutions for Class 7 Social Science Geography Chapter 4 Air 4
Answer.
NCERT Solutions for Class 7 Social Science Geography Chapter 4 Air 5

INTEXT QUESTIONS WITH THEIR ANSWERS

Question 1.
For ten days note down weather reports from a local newspaper and observe the changes occurring in the weather. (NCERT Page 23)
Answer.
Do this exercise yourselves with the help of your social science teacher.

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