Q161. A heat engine performs 100 J of work and at the same time rejects 400 J of heat energy to cold reservoirs. What is the efficiency of the engine?Physics — Heat and Thermodynamics — Question 161 of 415A. 20%B. 25%C. 4%D. 50%Practice more Physics MCQs for entrance exam preparation on Examora.io.← Previous Question Next Question →