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Saturday, 31 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. 12 Apr 2023, Shift 1 · Q38An engine operating between the boiling and freezing points of water will have A. efficiency more than 27%. B. efficiency less than the…MediumOther
  3. 25 Jul 2022, Shift 2 · Q45Let η1\eta_1 is the efficiency of an engine at T1\mathrm{T_1} = 447°C and T2\mathrm{T_2} = 147°C while η2\eta_2 is the efficiency at…EasySingle correct
  4. 27 Jul 2022, Shift 2 · Q38In 1st^{st} case, Carnot engine operates between temperatures 300 K and 100 K. In 2nd^{nd} case, as shown in the figure, a combination of…EasyDiagram basedHas a figure
  5. 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
  6. 30 Jul 2022, Shift 2 · Q7A Carnot engine is operating between the two reservoirs of temperature 227 ∘^\circC and 127 ∘^\circC respectively. If the engine…EasySingle correct

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 108 of the 174 JEE Main shifts held from 2017 to 2026.