JEE Main 2026 — Thermodynamics Question with Solution
JEE Main 2026 (21 January Shift 2)
Question
A diatomic gas does 100 J of work when it is expanded isobarically. Then the heat given to the gas J.
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Show full solutionCorrect answer: 350
Correct answer
350
Step-by-step explanation
For an isobaric process, the first law gives: .
For a diatomic gas with , we have and .
Since J for isobaric expansion, the change in internal energy is: J.
Therefore, J.
For a diatomic gas with , we have and .
Since J for isobaric expansion, the change in internal energy is: J.
Therefore, J.
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This is a previous-year question from JEE Main 2026, 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.