UPSC CAPF (AC) 2025 Paper I · Question 109

Question 109 of the UPSC CAPF (AC) 2025 Paper I (3 August 2025). Try it first, then open the answer and explanation.

1. CAPF 2025 · P-I · Q109 · General Science · Physics

   The working principle of refrigerator is based on the

   1. first law of thermodynamics
   2. second law of thermodynamics
   3. Planck's radiation law
   4. Rayleigh-Jeans law

   रेफ्रिजरेटर के कार्य करने का सिद्धांत किस पर आधारित है?

   1. ऊष्मागतिकी का प्रथम नियम
   2. ऊष्मागतिकी का द्वितीय नियम
   3. प्लांक का विकिरण नियम
   4. रैले-जीन्स नियम
   Show answer

   Answer: (2) second law of thermodynamics

   उत्तर: (2) ऊष्मागतिकी का द्वितीय नियम

   A refrigerator uses work done by its compressor to move heat from the cold inside to the warmer room; by the Clausius statement of the second law of thermodynamics, heat cannot flow from a colder to a hotter body on its own without external work. The first law only states energy conservation, while Planck's and Rayleigh-Jeans laws describe black-body radiation.

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