NCERT Solutions for Class 7 Social Science - Our Environment (Geography) Chapter 4 Air

NCERT Solutions for Class 7 Social Science - Our Environment (Geography) Chapter 4 - Air

Welcome to the Chapter 4 - Air, Class 7 Social Science - Our Environment (Geography) NCERT Solutions page. Here, we provide detailed question answers for Chapter 4 - Air. The page is designed to help students gain a thorough understanding of the concepts related to natural resources, their classification, and sustainable development.

Our solutions explain each answer in a simple and comprehensive way, making it easier for students to grasp key topics Air and excel in their exams. By going through these Air question answers, you can strengthen your foundation and improve your performance in Class 7 Social Science - Our Environment (Geography). Whether you’re revising or preparing for tests, this chapter-wise guide will serve as an invaluable resource.

Exercise 1

Q 1:

(i) What is atmosphere?
(ii) Which two gases make the bulk of the atmosphere?
(iii) Which gas creates green house effect in the atmosphere?
(iv) What is weather?
(v) Name three types of rainfall?
(vi) What is air pressure?

(i) A huge blanket of air by which our earth is covered is known as atmosphere. The atmosphere Contains following layers:
- Troposphere
- Stratosphere
- Mesosphere
- Thermosphere
- Exosphere
Out of these atmospheric layers, troposphere is the most important layer of the atmosphere which directly support life.

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

(iii) Carbon dioxide gas creates the greenhouse effect in the atmosphere, as it contributes maximus area in the atmosphere.

(iv) Whether is defined as hour to hour and day to day conditions of the atmosphere. It is short term state of the atmosphere. Either is hot or cold wet or dry.

(v) The following types of rainfall are:
- convectional rainfall
- orographic rainfall
- cyclonic rainfall

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

Q 2:

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

(i) (c) ozone
(ii) (a) troposphere
(iii) (b) stratosphere
(iv) (b) decrease
(v) (b) rain

Q 3:

(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

(i) Trade winds (e) permanent wind
(ii) Loo (f ) local wind

(iii) Monsoon (b) seasonal wind
(iv) Wind (c) horizontal movement of air

Q 4:

(i) Wet clothes take longer time to dry on a humid day?
(ii) Amount of insolation decreases from equator towards poles?

(i) This happens because on a humid day, there is more water in air than the sunny day. Because air can soak less water from wet clothes i.e, where rate of evaporation decrease.

(ii) Because sun rays fall vertical on the equator while slanting on the poles.

Q 5:

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

1. Humidity: It is defined as the Water vapour present in the air.

2. Cloud

3. Loo

4. weather

5. Rain

6. Peepal

7. atmosphere: Which is formed of air.

8. Carbon dioxide

9.Barometer

1o. insolation

11. Exosphere

12. air

13. Fog

14. Oxygen

15. wind

16. Neem

17. Noon

18. ozone: ozone is a layer which protect our earth from sun's harmful UV- radiations.

19. Cyclone: Cyclone is defined as the large air mass which rotates around the strong center which have low atmospheric pressure, in the counterclock-wise direction.

Frequently Asked Questions about Air - Class 7 Social Science - Our Environment (Geography)

- 1. How many questions are covered in Air solutions?
- All questions from Air are covered with detailed step-by-step solutions including exercise questions, additional questions, and examples.
- 2. Are the solutions for Air helpful for exam preparation?
- Yes, the solutions provide comprehensive explanations that help students understand concepts clearly and prepare effectively for both board and competitive exams.
- 3. Can I find solutions to all exercises in Air?
- Yes, we provide solutions to all exercises, examples, and additional questions from Air with detailed explanations.
- 4. How do these solutions help in understanding Air concepts?
- Our solutions break down complex problems into simple steps, provide clear explanations, and include relevant examples to help students grasp the concepts easily.
- 5. Are there any tips for studying Air effectively?
- Yes, practice regularly, understand the concepts before memorizing, solve additional problems, and refer to our step-by-step solutions for better understanding.

Exam Preparation Tips for Air

The Air is an important chapter of 7 Social Science - Our Environment (Geography). This chapter’s important topics like Air are often featured in board exams. Practicing the question answers from this chapter will help you rank high in your board exams.

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