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| Q. |
The water from a hand pump is warm in winter because – |
| A. | Our body is cold in winter and the water appears to be warm |
| B. | The temperature inside the earth is higher than the atmospheric temperature |
| C. | The pumping process causes friction which warms up the water |
| D. | Inside water comes out and absorbs heat from the environment |
| Answer» B. The temperature inside the earth is higher than the atmospheric temperature | |
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Explanation: In winter, the outside temperature is lower than that of water flowing out of the pump, and therefore, the water is warm. Whereas in summer, the outside temperature is higher than the water of the pump, and therefore, it feels cold. |
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