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 layer helps in radio transmission.

1

(a)

troposphere

(b)

stratosphere

(c)

thermosphere

(d)

mesosphere

Excess of CO₂ is responsible for

1

(a)

Global warming

(b)

Global cooling

(c)

Both (a) and (b)

(d)

None of these

When the air is heated it becomes

1

(a)

Heavier

(b)

Lighter

(c)

Colder

(d)

Warmer

Plants need_________________ for their survival.

1

(a)

nitrogen

___________released in the atmosphere creates greenhouse effect.

1

(a)

Carbon dioxide

All the weather phenomena occur in_______________.

1

(a)

Troposphere

The upper most layer of atmosphere is known as_____________.

1

(a)

Exosphere

_____________influences the distribution of temperature.

1

(a)

Insolation.

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

Our Earth receives only 2 in 2000000000 parts of the Sun's energy.

1

(a) True

(b) False

There is no air pressure on the Moon. Why?

1

(a)

There is no air on the Moon and hence, no air pressure on the Moon.

Where can we find highest air pressure?

1

(a)

The air pressure is highest at sea level.

How does air move?

1

(a)

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

What is hot and dry wind of Northern plains of India called?

1

(a)

The hot and dry wind of Northern plains of India is called l00.

How will you define humidity?

1

(a)

Humidity is the amount of water vapour in the air.

What is air pressure?

3

(a)

Briefly explain the composition of the atmosphere.

3

(a)

How do bacteria help plants in using nitrogen?

3

(a)

Briefly discuss about the distribution of air pressure in atmosphere.

3

(a)

Why do astronauts wear special protective suits when they go to the Moon?

3

(a)

Discuss the different layers of the atmosphere

5

(a)

Observe the following picture and answer the questions that follow

1.Is global warming a serious issue in today's world?
2.In the above newspaper cutting, state one reason for global warming.
3. What is according to you, a way out of global warming

5

(a)

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. For example, the sun comes out when rain stops. An example is given below:

5

(a)