Q: The working principle of refrigerator is based on
(a)first law of thermodynamics
(b)second law of thermodynamics
(c)Planck's radiation law
(d)Rayleigh-Jeans law
Correct Answer: (c)
The correct answer is (c): प्लैंक का विकिरण नियम. Subject: Indian Economy | Sub-topic: General Note: This answer was determined through AI-based research. Verify against the official answer key when available.