NCERT Solutions for Class 7 Geography Social Science Chapter 4 - Air
The Earth's atmosphere comprises a blend of various gases, primarily composed of roughly 78 percent nitrogen and 21 percent oxygen. Divided into five layers—Troposphere, Stratosphere, Mesosphere, Thermosphere, and Exosphere—the atmosphere plays a vital role. Weather denotes short-term atmospheric conditions, while climate represents the long-term average weather pattern of a region. For Class 7 students, the NCERT Solutions for Geography deliver comprehensive knowledge, offering a robust foundation for exam preparation.
Download PDF For NCERT Solutions for SST- Geography Air
The NCERT Solutions for Class 7 Geography Social Science Chapter 4 - Air are tailored to help the students master the concepts that are key to success in their classrooms. The solutions given in the PDF are developed by experts and correlate with the CBSE syllabus of 2023-2024. These solutions provide thorough explanations with a step-by-step approach to solving problems. Students can easily get a hold of the subject and learn the basics with a deeper understanding. Additionally, they can practice better, be confident, and perform well in their examinations with the support of this PDF.
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Access Answers to NCERT Solutions for Class 7 Geography Social Science Chapter 4 - Air
Students can access the NCERT Solutions for Class 7 Geography Social Science Chapter 4 - Air. Curated by experts according to the CBSE syllabus for 2023–2024, these step-by-step solutions make SST- Geography much easier to understand and learn for the students. These solutions can be used in practice by students to attain skills in solving problems, reinforce important learning objectives, and be well-prepared for tests.
Air
Answer the following questions.
(i) What is the atmosphere?
(ii) Which two gases make the bulk of the atmosphere?
(iii) Which gas creates a greenhouse effect in the atmosphere?
(iv) What is weather?
(v) Name three types of rainfall.
(vi) What is air pressure?
(i) The blanket of air surrounding the earth is called the atmosphere. The atmosphere primarily comprises nitrogen and oxygen in bulk and other gases like carbon dioxide, helium, ozone, etc. in less quantities. All living beings on earth depend on the atmosphere for their survival.
(ii) The two gases that make the bulk of the atmosphere are:
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Oxygen (21%)
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Nitrogen (78%)
(iii) Carbon dioxide is the gas that creates the greenhouse effect in the atmosphere.
(iv) The hour-to-hour or the day-to-day condition of the atmosphere is called weather. Weather can change dramatically from day-to-day. It may be classified as hot, dry, cold or wet.
(v) The three types of rainfall are as follows:
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Convectional rainfall
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Orographic rainfall
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Cyclonic rainfall
(vi) Air pressure is defined as the pressure exerted by the weight of air on the earth’s surface. The air pressure decreases as height increases and is the highest at the sea level.
Tick the correct answer.
(i) Which of the following gases protects 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
(ii) a
(iii) b
(iv) b
(v) b
Match the following.
|
(i) Trade Winds |
(a) Incoming solar energy |
|
(ii) Loo |
(b) Seasonal wind |
|
(iii) Monsoon |
(c) The horizontal movement of air |
|
(iv) Wind |
(d) A 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) The horizontal movement of air |
Give reasons.
(i) Wet clothes take longer time to dry on a humid day?
(ii) Amount of insolation decreases from the equator towards poles?
(i) Wet clothes take longer time to dry on a humid day because the amount of water in the air is more on a humid day than on a sunny day. Due to this, the rate of evaporation decreases and air soaks in less water from the clothes.
(ii) Insolation is the incoming solar energy intercepted by the earth. Amount of insolation decreases from the equator toward poles because sun rays fall vertically on the equator and slant on the poles.
Frequently Asked Questions
The NCERT solution for Class 7 Chapter 4: Air is important as it provides a structured approach to learning, ensuring that students develop a strong understanding of foundational concepts early in their academic journey. By mastering these basics, students can build confidence and readiness for tackling more difficult concepts in their further education.
Yes, the NCERT solution for Class 7 Chapter 4: Air is quite useful for students in preparing for their exams. The solutions are simple, clear, and concise allowing students to understand them better. They can solve the practice questions and exercises that allow them to get exam-ready in no time.
You can get all the NCERT solutions for Class 7 Geography Chapter 4 from the official website of the Orchids International School. These solutions are tailored by subject matter experts and are very easy to understand.
Yes, students must practice all the questions provided in the NCERT solution for Class 7 Geography Chapter 4: Air as it will help them gain a comprehensive understanding of the concept, identify their weak areas, and strengthen their preparation.
Students can utilize the NCERT solution for Class 7 Geography Chapter 4 effectively by practicing the solutions regularly. Solve the exercises and practice questions given in the solution.