The efficiency of an ideal heat engine working between the freezing point and boiling point of water, is

1. 26.8%

2. 6.25%

3. 20%

4. 12.5%

Doubtly Asked 30 Oct 2026 NEET UG 2018 neet Save WhatsApp Report

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Answer: 1. 26.8%

Efficiency of an ideal (Carnot) engine is $\eta=1-\dfrac{T_2}{T_1}$, with temperatures in kelvin.

$T_2=273$ K (freezing point), $T_1=373$ K (boiling point).

$$\eta=1-\frac{273}{373}=\frac{100}{373}\approx0.268=26.8\%$$

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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