JEE Main 2023 · PhysicsMultiple choiceSingle correctEasyCalculation

JEE Main 8 April 2023, Shift 2, Physics Q34

Question 34 of 90 in this shift, Physics question 4 of 30, Section A.

Work done by a Carnot engine operating between temperatures

127^\circ

C and

27^\circ

C is 2 kJ. The amount of heat transferred to the engine by the reservoir is :

(1)2 kJ
(2)2.67 kJ
(3)8 kJOfficial answer
(4)4 kJ

Official answer

Option 3

NTA final key.

Chapter: Thermodynamics
Topic: Heat Engines and Refrigerators
Idea tested: Carnot Efficiency Limit

Same idea in other shifts

Asked 4× in all

28 Jul 2022, Shift 1 · Q37A Carnot engine has efficiency of 50%. If the temperature of sink is reduced by $40^\circ$ C, its efficiency increases by 30%. The…MediumSingle correct
24 Jun 2022, Shift 1 · Q47A Carnot engine whose heat sinks at $27^\circ$ C, has an efficiency of 25%. By how many degrees should the temperature of the source be…MediumSingle correct
16 Mar 2021, Shift 2 · Q26For an ideal heat engine, the temperature of the source is $127^\circ$ C. In order to have 60% efficiency the temperature of the sink…EasyNumerical value

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 42 of the 174 JEE Main shifts held from 2017 to 2026.