The water from a hand-pump is warm in winter because ___________.

our body is cold in winter and water appears to be warm

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the temperature inside the earth is higher than the atmospheric temperature

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the pumping process causes friction which warms up the water

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inside water comes out and absorbs heat from the environment

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Solution

The correct option is C the temperature inside the earth is higher than the atmospheric temperature
As temperature inside the earth's surface is higher, the ground water is hotter than the atmosphere.
So when ground water is pumped out, it feels hotter.

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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.

0 C

4 C

4 C

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