JEE Main 2021 · PhysicsMultiple choiceSingle correctMediumConceptual

JEE Main 26 February 2021, Shift 2, Physics Q13

Question 13 of 90 in this shift, Physics question 13 of 30, Section A.

The internal energy (U), pressure (P) and volume (V) of an ideal gas are related as U = 3PV + 4. The gas is :

(1)monoatomic only.
(2)diatomic only.
(3)polyatomic only.Official answer
(4)either monoatomic or diatomic.

Official answer

Option 3

NTA final key.

Chapter: Kinetic Theory
Topic: Kinetic Theory of Gases
Idea tested: Law of Equipartition

Same idea in other shifts

Asked 6× in all

2 Apr 2025, Shift 2 · Q50The internal energy of air in $4\ \mathrm{m}\times4\ \mathrm{m}\times3\ \mathrm{m}$ sized room at 1 atmospheric pressure will be…EasyNumerical value
8 Apr 2024, Shift 1 · Q39A mixture of one mole of monoatomic gas and one mole of a diatomic gas (rigid) are kept at room temperature ( $27^\circ$ C). The ratio of…EasySingle correct
26 Jun 2022, Shift 2 · Q37A flask contains argon and oxygen in the ratio of 3:2 in mass and the mixture is kept at $27^\circ$ C. The ratio of their average kinetic…EasySingle correct
25 Feb 2021, Shift 2 · Q6Given below are two statements : Statement I : In a diatomic molecule, the rotational energy at a given temperature obeys Maxwell’s…MediumTwo statements
18 Mar 2021, Shift 1 · Q17What will be the average value of energy along one degree of freedom for an ideal gas in thermal equilibrium at a temperature T ? ( $k_B$ …EasySingle 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.