JEE Main 2026 · PhysicsNumerical answerNumerical valueMediumMulti-step

JEE Main 2 April 2026, Shift 1, Physics Q47

Question 47 of 75 in this shift, Physics question 22 of 25, Section B.

A vessel contains

0.15\ \mathrm{m^3}

of a gas at pressure

8

bar and temperature

140\ ^\circ

C with

c_p=3R

and

c_v=2R

. It is expanded adiabatically till pressure falls to

1

bar. The work done during this process is __________ kJ. (

R

is gas constant)

Official answer

120

NTA final key.

Chapter: Thermodynamics
Topic: First Law of Thermodynamics
Idea tested: Adiabatic Work Formula

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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.