Q16 of 22 Page 45

Match Column I with Column II. There can be more than one match.

As we know that warm air rises up and it is lighter because it expands.

Cool air sinks down because it is heavy and is compresses air and has high pressure.


So the answer to the question is,


On heating air, it expands and rises.


On cooling air, it contracts and descends.



More from this chapter

All 22 →
14

Figure 8.3 shows a diagrammatic representation of trees in the afternoon along a sea coast. State on which side is the sea; A or B? Give reasons for your choice.

 15

A flag mounted on a flag post near the sea coast flutters in the direction of the sea. At what time of the day does this happen – at midnight or in the afternoon?

 17

Paheli kept an empty bottle made of plastic inside a refrigerator. After a few hours, when she opened the refrigerator she found the bottle had collapsed. Explain the possible reason.

 18

When strong/ high-speed wind blows, an umbrella held upright at times gets upturned. Explain the reason.