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


(i) Solve this crossword puzzle with the help of given clues. Across: 6. An Indian tree having extraordinary quality of providing oxygen round the clock 8. Gas present in atmosphere occupying only 0.03% by volume 11. Outermost layer of atmosphere 12. Mixture of many gases 14. Life giving gas 15. Air in motion: Wind 16. An Indian tree valued highly for medicinal properties 18. Gas protecting us from harmful sunrays 19. Low pressure area Down: 1. Amount of water vapour in air 2. Condensation of water vapour around dust particles in atmosphere 3. Example of local wind blowing in summer in northern India 4. Short term changes in 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-------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.




6. An Indian tree having extraordinary quality of providing oxygen round the clock: Peepal

8. Gas present in atmosphere occupying only 0.03% by volume: Carbon dioxide

11. Outermost layer of atmosphere: Exosphere

12. Mixture of many gases: Air

14. Life giving gas: Oxygen

15. Air in motion: Wind

16. An Indian tree valued highly for medicinal properties: Neem

18. Gas protecting us from harmful sunrays: Ozone

19. Low pressure area: Cyclone


1. Amount of water vapour in air: Humidity

2. Condensation of water vapour around dust particles in atmosphere: Cloud

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

4. Short term changes in atmosphere: Weather

5. Precipitation in liquid form: Rain

7. Blanket of air around the earth: Atmosphere

9. Instrument to measure pressure: Barometre

10. Incoming solar radiation: Insolation

13. Reduces visibility in winters: Fog 

17. It is noon time when sun is overhead.   



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


(i) Water from wet clothes evaporates due to the presence of sun and wind. The rate of evaporation is much slower on a humid day than that on a dry day.This is because the air already has some amount of moisture present in it. Hence, it takes longer to dry wet clothes.

(ii) Sunlight falls almost vertically on the equator, while it falls at a slanting angle on the poles. Therefore,the amount of insolation decreases from equator towards the poles. The amount of insolation received by the equatorial regions is greater than that received by the polar regions.


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


(i) Trade winds           (e) Permanent wind

(ii) Loo                       (f) Local wind

(iii) Monsoon              (b) Seasonal wind

(iv) Wind                    (c) Horizontal movement of air 


(i) Which of the following gases protect 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


(i) (c) Ozone ✓

(ii) (a) Troposphere ✓

(iii) (b) Stratosphere ✓

(iv) (b) Decreases ✓

(v) (b) Rain ✓


Answer the following questions. (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) The huge blanket of air that surrounds the earth is known as atmosphere.

(ii) The gases which make the bulk of atmosphere are nitrogen and oxygen.

(iii) Carbon dioxide creates green house effect in the atmosphere.

(iv) The state of atmosphere at a particular place and time is known as weather. It is the hour-to-hour, day to day condition of the atmosphere.

(v) Three types of rainfall are:

                      (a) The Convectional Rainfall
                      (b) The Relief or Orographic Rainfall, and
                      (c) The Cyclonic Rainfall

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

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Following are some of the benefits of using NCERT Solutions by Extramarks.

1. The NCERT solutions for class 7 are prepared keeping in mind the necessary rules and format issued by the CBSE board thus providing students much-needed preview of the exam pattern of questions and preview of the exam that they are going to face during the final exams.

2. The students can be sure about the quality of the solutions as they are committed by highly experienced and expert teachers. These teachers have years of experience and they make sure that there is no mistake committed when preparing the solutions.

3. The NCERT 7 solutions are provided for the questions that are most likely to appear in the exam thus improving the efficiency of the students by helping them prepare for the important parts of the syllabus.

Tips & Strategies for Class 7 Exam Preparation

1. Start your revision early so you can revise well and grasp all the difficult concepts.

2. Organize your study time by making a timetable as it will help you manage your time accordingly.

3. Take mock tests and solve sample papers as they will help you learn time management during the exam and make you familiar with the exam pattern.

4. Take regular breaks, look after yourself by sleeping properly and eating well.

5. Know your exam well, explore the mock tests, and practice sample papers as much as you can.

Why Choose Extramarks CBSE Class 7 Study Materials?

1. The solutions have been compiled keeping in mind the purpose of scoring high marks in exams thus they have everything that the students need to prepare for exams.
2. The NCERT solutions for class 7 are designed in a clear and simple language complete with diagrams so that the students understand the subject well.
3. The NCERT 7 solutions are accurate thus improving their reliability.
4. The solutions are designed by expert and experienced teachers that help in removing all doubts out of the solutions and improving the credibility of the answers.

Frequently Asked Questions

Is class 7 Math NCERT book sufficient for prepare for the exams?

Yes, the NCERT book has been designed keeping in mind the pattern of paper that will be presented in the exam to students. The NCERT book is sufficient to study for the exam as it has everything related to the exam and contains all information out of which the questions will be asked in the exam. But if you want to prepare a little bit extra, we suggest that you go through the NCERT class 7 solutions.

When to refer to NCERT solutions for class 7th?

When you are studying the NCERT book for math and other subjects for your class 7 exams, refer to the NCERT class 7 solutions simultaneously so you can see where you are going wrong and what are you getting right in your exercises’ attempt.

Why are the NCERT solutions important for Class 7th?

The class 7th is very crucial as it is among the major middle school classes during which the child’s base is formed in math and science and even in other subjects like English. Thus, it is students must study smartly in this class and ace their exams while getting all the help they need from the NCERT 7 solutions given by Extramarks.

Can I rely on the NCERT solutions for class 7 Math at Extramarks to perform well in the annual exam?

Yes, absolutely. The NCERT solutions provided by Extramarks for class 7 are eloquent and elaborate at best and are thus useful for students studying for the final exams of class 7. The students will have many questions and doubts regarding the NCERT solutions for class 7 and this is why the solutions have been elaborated well to help students understand the answers to exercises.

Do you provide NCERT solutions for Class 7 Math for free?

Yes, the NCERT solutions for Math and other subjects for class 7 are available for free from Extramarks.

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