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When a hot body and a cold body are placed in contact, which statement about the heat exchange is correct (assuming no loss to surroundings)?
AHeat flows from the cold body towards the hot body
BThe mass of the hot body decreases as it cools down
CHeat gained by the cold body equals heat lost by the hot
DBoth bodies gain heat energy from one another
Answer & Solution
Correct answer: C. Heat gained by the cold body equals heat lost by the hot
1. Heat always flows from higher to lower temperature, here hot to cold.
2. For any exchange with no losses, heat gained equals heat lost.
3. So the cold body's gain equals the hot body's loss.
4. Mass does not change during heating or cooling, ruling out that option.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 3 Thermal Physics "Characteristic Features of Heat Transfer", p.40_
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