Trapped air is a ________ conductor of heat.

Good

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Poor

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Both

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None

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Solution

The correct option is B Poor
The window shades of rooms are pulled down so that a layer of still air is formed near the window to reduce the heat loss by conduction since trapped air is poor conductor of heat.

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Question 2

A beggar wrapped himself with a few layers of newspaper on a cold winter night. This helped him to keep himself warm because:

(a) Friction between the layers of newspaper produces heat

(b) Air trapped between the layers of newspaper is a bad conductor of heat.

(d) Newspaper is at a higher temperature than the temperature of the surrounding.

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