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One calorie is defined as the amount of heat energy required to raise the temperature of how much water through $1\,^\circ\text{C}$?
A1 kilogram of water
B1 litre of water
C100 grams of water
D1 gram of water
Answer & Solution
Correct answer: D. 1 gram of water
1. A calorie is defined for 1 gram of water raised by $1\,^\circ\text{C}$.
2. The kilogram version of this definition is the kilocalorie, not the calorie.
3. So one calorie corresponds to 1 gram of water.
4. Choosing 1 kilogram confuses calorie with kilocalorie, a common trap.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 3 Thermal Physics "Other Units of Heat Energy", p.41_
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