NCERT Solutions Class 7 Social Science Geography Chapter 4 Air

NCERT Solutions Class 7 Geography Chapter 4 PDF

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NCERT Solutions for Class 7 Social Science Geography Chapter 4 Air is provided here according to the latest NCERT (CBSE) guidelines. Students can further clear all their doubts and also get better marks in the exam. With these solutions, students will be able to understand each topic clearly and at the same time prepare well for the exams. This chapters important topics are more or less, NCERT solutions for class 7 geography chapter 4. It will enable the students to understand the chapter entirely and allow them to solve question answers independently. Air chapter class 7 PDF free download was designed by expert teachers from the latest edition of NCERT books to get good marks in board exams. We recommend you to study our geography solution class 7. Students can easily access the solutions which include important chapter questions and detailed explanations provided by our experts. To give you a brief idea of the chapter, it basically deals with topics like;

  • Understanding what is the atmosphere
  • Describing the term ‘Amounts of insolation decreases from the equator towards poles’
  • Finding out which gas creates a greenhouse effect in the atmosphere

Get CBSE Class 7 Geography NCERT solutions for chapter 4- Air below. These solutions consist of answers to all the important questions in NCERT book chapter 4.

NCERT Solutions Class 7 Geography Chapter 4

Page No: 27

Exercises

1. Answer the following questions.

(i) What is atmosphere?

Answer:

The earth is surrounded by a huge blanket of air called atmosphere.

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

Answer:

Nitrogen and oxygen make the bulk of the atmosphere.

(iii) Which gas creates green house effect in the atmosphere?

Answer:

Carbon dioxide creates the greenhouse effect in the atmosphere.

(iv) What is weather?

Answer:

Weather is short-term state of the atmosphere whether it is hot or cold, wet or dry. It is the hour to hour, day to day condition of the atmosphere.

(v) Name three types of rainfall?

Answer:

Three types of rainfall are:

(i) Convectional rainfall

(ii) Orographic rainfall

(iii) Cyclonic rainfall

(vi) What is air pressure?

Answer:

The pressure exerted by the weight of air on the surface of the earth is called air pressure.

2. Tick the correct answer.

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

(a) Carbon dioxide (b) Nitrogen (c) Ozone

✓ (c) Ozone

(ii) The most important layer of the atmosphere is

(a) Troposphere (b) Thermosphere (c) Mesosphere

✓ (a) Troposphere

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

(a) Troposphere (b) Stratosphere (c) Mesosphere

✓ (b) Stratosphere

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

(a) Increases (b) Decreases (c) Remains the same

✓ (b) Decreases

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

(a) Cloud  (b) Rain  (c) Snow

✓ (b) Rain

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 Winds
(e) Permanent wind
(ii) Loo (f) Local wind
(iii) Monsoon
(b) Seasonal wind
(iv) Wind
(c) Horizontal movement of Air

4. Give reasons.

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

(ii) Amount of insolation decreases from equator towards poles?

Answer:

(i) In humid day, the humidity is very high that is the level water vapour in atmosphere is high. Due to this, air is not able carry away more water vapour with it and thus the clothes take longer time to dry on a humid day.

(ii) Insolation is the incoming solar energy intercepted by the earth. Sunlight falls almost vertically on the equator whereas it falls at some angle on the poles. Due to this, amount of insolation decreases from equator towards poles.

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