JEE Main 2026 · PhysicsMultiple choiceSingle correctMediumMulti-step

JEE Main 8 April 2026, Shift 2, Physics Q36

Question 36 of 75 in this shift, Physics question 11 of 25, Section A.

Initial pressure and volume of a monoatomic ideal gas are

P

and

V

. The change in internal energy of this gas in adiabatic expansion to volume

V_{final} = 27\,V

is ________ J.

(1) $-2\,PV\,(3\sqrt{3} - 1)$
(2) $\frac{4}{3}PV$
(3) $-\frac{4}{3}PV$ Official answer
(4) $\frac{3}{4}PV$

Official answer

Option 3

NTA final key.

Chapter: Thermodynamics
Topic: First Law of Thermodynamics
Idea tested: Work and Internal Energy in Adiabatic Processes

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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. Lumi analyses 42 of the 174 JEE Main shifts held from 2017 to 2026.