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.

AcademicPhysicsNCERTClass 7

A beggar wrapped himself with a few layers of newspaper on a cold winter night. This helped him to keep himself warm because the heat from his body can't pass to the surroundings as the newspaper is a bad conductor of heat.

So, option $(b)$ is correct.

raja
Updated on 10-Oct-2022 13:29:41

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