Heat & Thermodynamics · JEE Advanced previous year questions

2025 2 questions

1. Q242025 · 18 May 2025 · Paper 2· One or more correct

   The efficiency of a Carnot engine operating with a hot reservoir kept at a temperature of $1000\mathrm{K}$ is $0.4$. It extracts $150\mathrm{J}$ of heat per cycle from the hot reservoir. The work extracted from this engine is being fully used to run a heat pump which has a coefficient of performance $10$. The hot reservoir of the heat pump is at a temperature of $300\mathrm{K}$. Which of the following statements is/are correct:

   1. A.Work extracted from the Carnot engine in one cycle is $60\mathrm{J}$.
   2. B.Temperature of the cold reservoir of the Carnot engine is $600\mathrm{K}$.
   3. C.Temperature of the cold reservoir of the heat pump is $270\mathrm{K}$.
   4. D.Heat supplied to the hot reservoir of the heat pump in one cycle is $540\mathrm{J}$.
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   Answer: A, B, C

2. Q272025 · 18 May 2025 · Paper 2· Numerical answer
   
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   Answer: 1.6