Match the items of Column I with the items of Column II

Observe the picture given in Fig. 15.1 carefully and answer the following questions

(a) What is covering the nose and mouth of the police man?

(b) Why is he putting a cover on his nose?

(c) Can you comment on air quality of the place shown in the Fig.15.1?

Garima observed that when she left her tightly capped bottle full of water in the open sunlight, tiny bubbles were formed all around inside the bottle. Help Garima to know why it so happened?

Explain the following observations very briefly

(a) A firki does not rotate in a closed area.

(b) The arrow of weather cock points towards a particular direction at a particular moment.

(c) An empty glass, in fact, is not empty.

(d) Breathing through the mouth may harm you.

Write just a few sentences for an imaginary situation if any of the following gases disappear from the atmosphere

(a) oxygen

(b) nitrogen

(c) carbon dioxide