Learn

Friday, 9 October

JEE Main 2020 · PhysicsNumerical answerNumerical valueMediumMulti-step

JEE Main 6 September 2020, Shift 2, Physics Q22

Question 22 of 75 in this shift, Physics question 22 of 25.

An engine operates by taking a monatomic ideal gas through the cycle shown in the figure. The percentage efficiency of the engine is close to ________.

The figure, in words

P-V diagram of a rectangular cycle ABCD: A (V0, P0), B (V0, 3P0), C (2V0, 3P0), D (2V0, P0); arrows A->B->C->D->A; P axis marked P0, 2P0, 3P0; V axis marked V0, 2V0

Official answer

19.00 to 19.10

NTA final key (Sep 2020). Any value in the range scored.

Chapter
Thermodynamics
Topic
Heat Engines and Refrigerators
Idea tested
Non-Carnot Cycle Efficiency

Same topic in other shifts

All Heat Engines and Refrigerators questions
  1. 8 Apr 2023, Shift 2 · Q34Work done by a Carnot engine operating between temperatures 127∘127^\circC and 27∘27^\circC is 2 kJ. The amount of heat transferred to the…EasySingle correct
  2. 28 Jul 2022, Shift 1 · Q37A Carnot engine has efficiency of 50%. If the temperature of sink is reduced by 40∘40^\circC, its efficiency increases by 30%. The…MediumSingle correct
  3. 24 Jun 2022, Shift 1 · Q47A Carnot engine whose heat sinks at 27∘27^\circC, has an efficiency of 25%. By how many degrees should the temperature of the source be…MediumSingle correct
  4. 29 Jun 2022, Shift 1 · Q56300 cal. of heat is given to a heat engine and it rejects 225 cal. of heat. If source temperature is 227∘C227^\circ\mathrm{C}, then the…EasyNumerical value
  5. 16 Mar 2021, Shift 2 · Q26For an ideal heat engine, the temperature of the source is 127∘127^\circC. 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. This question needs a figure we do not reproduce; it is described in words above. Lumi analyses 42 of the 174 JEE Main shifts held from 2017 to 2026.