Q117. The efficiency of a heat engine is 40% when its sink is at a temperature of 300 K. To increase the efficiency to 60% while keeping the sink temperature constant, by how much must the source temperature be increased?Physics — NUST Mock By IBAGRADS 5 — Question 117 of 200A. 750 KB. 500 KC. 250 KD. 1000 KPractice more Physics MCQs for entrance exam preparation on Examora.io.← Previous Question Next Question →