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

1

(a)

Carbon dioxide

(b)

Nitrogen

(c)

Ozone

Which one does not happen when air is heated?

1

(a)

It expands

(b)

It becomes lighter

(c)

It goes up

(d)

It comes down

This instrument measures temperature.

1

(a)

barometer

(b)

wind vane

(c)

thermometer

(d)

rain gauge

The wind blows constantly throughout the year in particular direction:

1

(a)

Permanent winds

(b)

Local winds

(c)

Seasonal winds

(d)

Both (a) and (b)

Which one of the following is a local wind?

1

(a)

Sea breeze

(b)

Trade wind

(c)

Monsoon wind

(d)

None of these

The standard unit of measuring temperature is degree ________________

1

(a)

Celsius

Temperature in cities is much ________________than that of villages.

1

(a)

higher

Meteorites burn up in ____________________on entering from the space.

1

(a)

mesosphere

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

1

(a)

ozone

Plants need_________________ for their survival.

1

(a)

nitrogen

Our atmosphere is divided into five layers.

1

(a) False

(b) True

Climate can change from day to day.

1

(a) True

(b) False

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

1

(a) True

(b) False

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

1

(a) False

(b) True

Heavy air rises up and creates a high pressure area. 

1

(a) True

(b) False

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

2

(a)

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.

Give the significance of greenhouse gas

2

(a)

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

What is the nature of hot air?

2

(a)

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

What happens when air cools down?

2

(a)

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

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

2

(a)

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

What is air pressure?

5

(a)

Distinguish between rainfall and snowfall.

5

(a)

Explain the circulation of air in the atmosphere.

5

(a)

Discuss the different layers of the atmosphere

5

(a)

Give an account of the different layers of the atmosphere.

5

(a)