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.

(c) Newspaper is a conductor of heat.

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

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Solution

Air trapped between the newspaper and your body does not conduct heat to the surroundings. Hence, the warm air trapped between the body and newspaper will keep him warm. So, the answer is (b).

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Question 40
The bar graph below represents the circulation of the newspapers in different languages in a town,

Study the bar graph and answer the following questions:
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Flow of Heat

Standard VII Physics

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