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Friday, 9 October

JEE Main Physics · Thermodynamics

Heat Engines and Refrigerators in JEE Main

Heat Engines and Refrigerators (Physics, Thermodynamics) came 6 times in 6 of the 42 JEE Main shifts Lumi analysed, across 3 distinct ideas. 0 of them came in 2024–26; it was last asked in 2023.

Questions
6
in 6 shifts
Ideas asked
3
1 asked more than once
Numerical answer
3
50% of its questions
Pattern
Comes in cycles
rarely asked since 2024
Questions each year
0240’171’201’213’221’230’240’250’26

In the shifts Lumi analysed for each year.

Difficulty and format
Easy 3Medium 3Hard 0

Format

  • Numerical value3 Q
  • Single correct3 Q
Ideas inside the topic
3 ideas
Where it sits

Part of Thermodynamics, which had 48 questions in all. Heat Engines and Refrigerators accounts for 13% of them. In Lumi's JEE taxonomy it belongs to Thermodynamics.

Every question

All 6 Heat Engines and Refrigerators questions

Newest first, each with its options and official answer.

  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
  6. 6 Sep 2020, Shift 2 · Q22An engine operates by taking a monatomic ideal gas through the cycle shown in the figure. The percentage efficiency of the engine is close…MediumNumerical valueHas a figure