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Going by the calorie definition, the heat needed to raise the temperature of 1 kg of water by 1 °C (in the 14.5 °C to 15.5 °C range) is:
A1000 cal
B1 cal
C100 cal
D4.18 cal
Answer & Solution
Correct answer: A. 1000 cal
1. One calorie raises 1 g of water by 1 °C in this range.
2. 1 kg of water = 1000 g.
3. Heat needed = 1000 g × 1 cal/g = 1000 cal, which is 1 kcal.
4. The value 1 cal applies to 1 g only, not 1 kg, so it is rejected.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 5 "Heat", p.76_
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