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Q1 (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?Ans: (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.
Q2 (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) SnowAns: (i) (c) ozone
(ii) (a) troposphere
(iii) (b) stratosphere
(iv) (b) decrease
(v) (b) rainQ3 (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 windAns: (i) Trade winds (e) permanent wind
(ii) Loo (f ) local wind(iii) Monsoon (b) seasonal wind
(iv) Wind (c) horizontal movement of airQ4 (i) Wet clothes take longer time to dry on a humid day?
(ii) Amount of insolation decreases from equator towards poles?Ans: (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.
Q5 (i) Solve this Crossword puzzle with the help of given clues:
/7th_social science - our environment (geography)_4_1_5_1639752597_50.jpg)
Ans: 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.
Air Question Answers: NCERT Class 7 Social Science - Our Environment (Geography)
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 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 ( Page No. : 27 )
Key Features of NCERT Class 7 Social Science - Our Environment (Geography) Chapter 'Air' question answers :
- All chapter question answers with detailed explanations.
- Simple language for easy comprehension.
- Aligned with the latest NCERT guidelines.
- Perfect for exam preparation and revision.
Popular Questions of Class 7 Social Science - Our Environment (Geography)
- Q:-
Imagine an ideal environment where you would love to live. Draw the picture of your ideal environment.
- Q:-
(i) There is scanty vegetation in the deserts.
(ii) People of the Sahara desert wear heavy robes. - Q:-
Observe the photographs given below. These are various features made by a river. Identify them and also tell whether they are erosional or depositional or landforms formed by both.
- Q:-
(i) Wet clothes take longer time to dry on a humid day?
(ii) Amount of insolation decreases from equator towards poles? - Q:-
(i) Ocean water is salty.
(ii) The quality of water is deterioting. - Q:-
(i) Sahara is located in which part of Africa
(a) eastern (b) northern (c) western
(ii) Sahara is what type of desert
(a) cold (b) hot (c) mild
(iii) The Ladakh desert is mainly inhabited by
(a) Christians and Muslims
(b) Buddhists and Muslims
(c) Christians and Buddhists
(iv) Deserts are characterised by
(a) scanty vegetation
(b) heavy precipitation
(c) low evaporation(v) Hemis in the Ladakh is a famous
(a) temple (b) church (c) monastery
(vi) Egypt is famous for growing
(a) wheat (b) maize (c) cotton - Q:-
(i) Name the continent in which the Amazon Basin is located.
(ii) What are the crops grown by the people of the Amazon Basin.
(iii) Name the birds that you are likely to find in the rainforests of the Amazon.
(iv) What are the major cities located on the River Ganga.
(v) Where is the one-horned rhinoceros found? - Q:-
(i) Which is not a natural ecosystem?
(a) Desert (b) Aquarium (c) Forest
(ii) Which is not a component of human environment?
(a) Land (b) Religion (c) Community
(iii) Which is a human made environment?
(a) Mountain (b) Sea (c) Road
(iv) Which is a threat to environment?
(a) Growing plant(b) Growing population (c) Growing crops - Q:-
(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 - Q:-
(i) Today’s world is shrinking.
Recently Viewed Questions of Class 7 Social Science - Our Environment (Geography)
- Q:-
(i) We cannot go to the centre of the earth.
(ii) Sedimentary rocks are formed from sediments.
(iii) Limestone is changed into marble. - Q:-
(i) The name of one river is hidden in each of the sentences below. Spot it. Example:Mandira, Vijayalakshmi and Surinder are my best friends Answer: Ravi
(a) The snake charmer’s bustee, stables where horses are housed, and the piles of wood, all caught fire accidentally. (Hint: Another name for River Brahmputra)
(b) The conference manager put pad, material for reading and a pencil for each participant (Hint: A distributary on the Ganga-Brahmputra delta)
(c) Either jealousy or anger cause a person’s fall (Hint: Name of a juicy fruit!)
(d) Bhavani germinated the seeds in a pot (Hint: Look for her in West Africa)
(e) “I am a zonal champion now” declared the excited athlete. (Hint: The river that has the biggest basin in the world)
(f) The tiffin box rolled down and all the food fell in dusty potholes. (Hint: Rises in India and journeys through Pakistan)
(g) Malini leaned against the pole when she felt that she was going to faint. (Hint: Her delta in Egypt is famous)
(h) Samantha mesmerised everybody with her magic tricks. (Hint: London is situated on her estuary)
(i) “In this neighbourhood, please don’t yell! Owners of these houses like to have peace”. Warned my father when we moved into our new flat”. (Hint: colour!)
(j) ‘Write the following words, Marc!’ “On”, “go”, “in”........ said the teacher to the little boy in KG Class. (Hint: Rhymes with ‘bongo’) Now make some more on your own and ask your classmates to spot the hidden name. You can do this with any name: that of a lake, mountains, trees, fruits, school items etc. - Q:-
(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 - Q:-
For fun.
(i) What are the minerals most commonly used in the following objects?
(ii) Identify some more objects made up of different minerals.
- Q:-
(i) What is an ecosystem?
(ii) What do you mean by natural environment?
(iii) Which are the major components of the environment?
(iv) Give four examples of human made environment.
(v) What is lithosphere?
(vi) Which are the two major components of biotic environment?
(vii) What is biosphere? - Q:-
(i) The process by which water continually changes its form and circulates between oceans, atmosphere and land
(a) Water cycle (b) Tides (c) Ocean currents
(ii) Generally the warm ocean currents originate near
(a) Poles (b) Equator (c) None of these
(iii) The rythmic rise and fall of ocean water twice in a day is called
(a) Tide (b) Ocean current (c) Wave - Q:-
(i) What are the four means of transport?
(ii) What do you understand by the term ‘settlement’?
(iii) Which are the activities practised by the rural people?
(iv) Mention any two merits of railways.
(v) What do you understand by communication?
(vi) What is mass media? - Q:-
(i) There is scanty vegetation in the deserts.
(ii) People of the Sahara desert wear heavy robes. - Q:-
(i) Toucans are a type of
(a) birds (b) animals (c) crops
(ii) Manioc is the staple food of
(a) Ganga Basin (b) Africa (c) Amazon
(iii) Kolkata is located on the river
(a) Orange (b) Hooghly (c) Bhagirathi
(iv) Deodars and firs are a type of
(a) Coniferous trees (b) Deciduous trees (c) shrubs
(v) Bengal tiger is found in
(a) mountains (b) delta area (c) Amazon - Q:-
Observe the photographs given below. These are various features made by a river. Identify them and also tell whether they are erosional or depositional or landforms formed by both.
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