JEE Main 2020PhysicsThermodynamicsHardNumerical

JEE Main 2020Thermodynamics Question with Solution

JEE Main 2020 (06 Sep Shift 2)

Question

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

 

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Show full solutionCorrect answer: 19
Correct answer
19

Step-by-step explanation

W=2P0v0

Q+=WAB+WBC

=n.cvΔTAB+nCPΔTBC

=32×3P0v0P0v0+526P0V03P0V0

=3P0V0+152P0V0

=212P0V0

η=WQ+=2P0V0212P0V0=421

η%=4002119

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About this question

This is a previous-year question from JEE Main 2020, covering the Thermodynamics chapter of Physics. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.