JEE Main 2018PhysicsThermodynamicsEasyMCQ

JEE Main 2018 — Thermodynamics Question with Solution

JEE Main 2018 (08 Apr)

Question

Two moles of an ideal monoatomic gas occupies a volume V at 27oC . The gas expands adiabatically to a volume 2V. Calculate (a) the final temperature of the gas and (b) change in its internal energy.

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Show full solutionCorrect option: D
Correct answer
D(a)189 K  (b)-2.7 kJ

Step-by-step explanation

TVγ-1=Constant
γ=53⇒300V23=T2V23
⇒T=189K⇒ΔU=nCvΔT=2×32×8.314×-11=-2.7 kJ

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About this question

This is a previous-year question from JEE Main 2018, 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.