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JEE Main 2021 · PhysicsMultiple choiceSingle correctMediumCalculation

JEE Main 27 August 2021, Shift 1, Physics Q7

Question 7 of 90 in this shift, Physics question 7 of 30, Section A.

An ideal gas is expanding such that

\mathrm{PT}^3=

constant. The coefficient of volume expansion of the gas is :

(1) $\frac{1}{\mathrm{T}}$
(2) $\frac{2}{\mathrm{T}}$
(3) $\frac{3}{\mathrm{T}}$
(4) $\frac{4}{\mathrm{T}}$ Official answer

Official answer

Option 4

NTA final key.

Chapter: Thermodynamics
Topic: Thermal Expansion
Idea tested: Volume Expansion Coefficient of Ideal Gas

Same idea in other shifts

Asked 2× in all

5 Apr 2026, Shift 2 · Q34An ideal gas at pressure $P$ and temperature $T$ is expanding such that $PT^3$ = constant. The coefficient of volume expansion of the gas…MediumSingle correct

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 108 of the 174 JEE Main shifts held from 2017 to 2026.