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Using 1 cal = 4.18 J, the energy equivalent of 50 cal of heat in joules is:
A11.96 J
B54.18 J
C209 J
D418 J
Answer & Solution
Correct answer: C. 209 J
1. Conversion: $1\ \text{cal} = 4.18\ \text{J}$.
2. Multiply: $50\ \text{cal} \times 4.18\ \text{J/cal}$.
3. $= 209\ \text{J}$.
4. Dividing instead of multiplying gives the wrong 11.96 J, so that distractor is rejected.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 5 "Heat", p.76_
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