Composition of Air

Q. Write uses of PVC.

Q.

Which of the following is not a greenhouse gas?

1. Carbon dioxide

2. Ozone

3. Oxygen

4. Methane

Q.

Name four naturally occurring liquid forms of water

Q. Write uses of PVC.

Q.

2. Water from wet roads and rooftops disappears after rains. How does it happen?

Q.

How will you show that air contains water vapour?

Q.

Mention the various effects of air pollutants.

Q.

Identify the gases depicted with their percentage composition in the given pie chart.

1. (i) Nitrogen (ii) oxygen (iii) carbon dioxide (iv) argon (v) water vapour

2. (i) Oxygen (ii) nitrogen (iii) water vapour (iv) argon (v) carbon dioxide

3. (i) Nitrogen (ii) oxygen (iii) argon (iv) carbon dioxide (v) water vapour

4. (i) Water vapour (ii) oxygen (iii) nitrogen (iv) carbon dioxide (v) argon

Q.

86 Match the Column I with Column II

Column 1	Column 2
Weather Cock	Gases and fine dust particles
Mountaineers	Sailing yacht
Fine hair inside the nose	Oxygen cylinders
Smoke	Direction of air flow
Wind	Prevent dust particles

Q.

The adjoining diagram shows the approximate percentage of different components of air.

Which percentage is for:

(a) Nitrogen

(b) Carbon dioxide and other gases

(c) Oxygen

Q.

The lack of which of the following constituents of air forces us to gasp and struggle to breathe?

1. Water vapour

2. Carbon dioxide

3. Nitrogen

4. Oxygen