7th CBSE Social Science Air Model Question Paper | QB365

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7th CBSE Social Science Air Model Question Paper

Published on: 20/08/2019

Air

Download CBSE Class 7th Standard CBSE Social Science question papers, sample papers, important questions, and previous year solved papers in PDF format. Get free study materials, NCERT solutions, and exam preparation resources for Class 7th Standard CBSE Social Science

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Std: 7th Standard CBSE - Social Science

chapter: - Model Question paper

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Questions:

Generic 3

3 x 3 = 9

Explain the circulation of air in the atmosphere.

Distinguish between rainfall and snowfall.

What is air pressure?

Multiple Choice Question

5 x 1 = 5

Which one of the following is a local wind?

(a)

Sea breeze

(b)

Trade wind

(c)

Monsoon wind

(d)

None of these

The wind blows constantly throughout the year in particular direction:

(a)

Permanent winds

(b)

Local winds

(c)

Seasonal winds

(d)

Both (a) and (b)

This instrument measures temperature.

(a)

barometer

(b)

wind vane

(c)

thermometer

(d)

rain gauge

Which one does not happen when air is heated?

(a)

It expands

(b)

It becomes lighter

(c)

It goes up

(d)

It comes down

Which of the following gases protects us from harmful Sun rays?

(a)

Carbon dioxide

(b)

Nitrogen

(c)

Ozone

Generic 5

2 x 5 = 10

Give an account of the different layers of the atmosphere.

10.

Discuss the different layers of the atmosphere

Fill up / 1 Marks

5 x 1 = 5

11.

Plants need_________________ for their survival.

12.

One important feature of stratosphere is that, it contains a layer of ________________gas.

13.

Meteorites burn up in ____________________on entering from the space.

14.

Temperature in cities is much ________________than that of villages.

15.

The standard unit of measuring temperature is degree ________________

True or False

5 x 1 = 5

16.

Heavy air rises up and creates a high pressure area.

(a)

True

(b)

False

17.

Local winds blow only during a particular period of the day or year in a small area.

(a)

False

(b)

True

18.

The air always moves from low pressure areas to high pressure areas.

(a)

True

(b)

False

19.

Climate can change from day to day.

(a)

True

(b)

False

20.

Our atmosphere is divided into five layers.

(a)

False

(b)

True

1 Marks

5 x 1 = 5

21.

What is the use of carbon dioxide to the green plants?

22.

What happens when air cools down?

23.

What is the nature of hot air?

24.

Give the significance of greenhouse gas

25.

Greenhouse effect is caused by carbon dioxide. Justify the statement.

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Answers Key:

Generic 3

3 x 3 = 9

Process of circulation of air :
(i)When air is heated it expands, becomes light and rises up.
(ii) Cold air is dense so, it sinks down.
(iii) When hot air rises up, cold air from surrounding areas fill in the gap.

Distinction between Rainfall and Snowfall

S.No	Rainfall	Snowfall
(i)	These are the small droplets of water that fall on ground.	These are the frozen droplets of water that fall on ground.
(ii)	Rainfall occurs in the region where temperature remain above freezing point.	Snowfall occurs in the region where temperature remains below freezing point
(iii)	It is always in liquid form.	It is always in solid form.

The pressure exerted by the weight of air on the Earth's surface is called air pressure.

Multiple Choice Question

5 x 1 = 5

(d)
It comes down

Generic 5

2 x 5 = 10

Our atmosphere has five different layers. They are:
(i) Troposphere,
(ii) Stratosphere,
(iii) Mesosphere,
(iv) Thermosphere,
(v) Exosphere.
(i) Troposphere : It is most important layer of the atmosphere with average height of 13 km from the earth. The air that we breathe exists here. Almost all the weather phenomena such as rainfall, fog and hailstorm occur here.
(ii) Stratosphere : This layer extends up to a height of 50 km. It presents the most ideal conditions for flying aeroplanes. It contains a layer of ozone gas which protects us from harmful effects of the sun rays.
(iii) Mesosphere : This layer extends up to a height of 80 km. Meteorites burn up in this layer on entering from the space.
(iv) Thermosphere: In this layer temperature rises very rapidly with increasing height. Ionosphere is the part of this layer. This layer extends between 80- 400km. It helps in radio transmission. Radio waves transmitted from the earth are reflected back to the earth by this layer.

(v) Exosphere: It is the uppermost layer where there is very thin air. Light gases such as helium and hydrogen float into the space from here.

10.

The atmosphere is divided into five layers starting from the Earth's surface
(i) Troposphere Its average height is 13 km. The air we breathe exists here. Almost all the weather phenomena like rainfall, fog and hailstorm occur in this layer.
(ii) Stratosphere It lies above the troposphere which extends up to a height of 50 km. This layer is almost free from clouds and associated weather phenomenon, making conditions most ideal for flying aeroplanes. It contains a layer of ozone gas.
(iii) Mesosphere It lies above the stratosphere. It extends up to the height of 80 km. Meteorites burn up in this layer on entering from the space.
(iv) Thermosphere In thermosphere, temperature rises very rapidly with increasing height. Ionosphere is a part of this layer. It extends between 80-400 km. This layer helps in radio transmission. In fact, radio waves transmitted from the Earth are reflected back to the Earth by this layer.
(v) Exosphere This uppermost layer. This layer has very thin air. Light gases like helium and hydrogen float into the space from here.

Fill up / 1 Marks

5 x 1 = 5

11.

()
nitrogen

12.

()
ozone

13.

()
mesosphere

14.

()
higher

15.

()
Celsius

True or False

5 x 1 = 5

16.

(b)
False

17.

(a)
False

18.

(b)
False

19.

(b)
False

20.

(a)
False

1 Marks

5 x 1 = 5

21.

()
Plants use carbon dioxide to make their food and release oxygen.

22.

()
Cold air is denser and heavy, hence it tends to sink down.

23.

()
When air is heated, it expands, becomes lighter and goes up.

24.

()
Greenhouse gas maintains the atmospheric coldness, otherwise Earth would have been too cold to live in.

25.

()
Carbon dioxide act as transparent to incoming sunlight but opaque to outgoing lights and heats which creates a greenhouse effect by trapping the heat radiated from the Earth.