JEE Main 2025 · PhysicsMultiple choiceSingle correctEasyConceptual

JEE Main 7 April 2025, Shift 2, Physics Q33

Question 33 of 75 in this shift, Physics question 8 of 25, Section A.

The helium and argon are put in the flask at the same room temperature (300 K). The ratio of average kinetic energies (per molecule) of helium and argon is : (Give : Molar mass of helium = 4 g/mol, Molar mass of argon = 40 g/mol)

(1) $1:1$ Official answer
(2) $1:10$
(3) $10:1$
(4) $1:\sqrt{10}$

Official answer

Option 1

NTA final key.

Chapter: Kinetic Theory
Topic: Kinetic Theory of Gases
Idea tested: Kinetic Energy and Temp

Same idea in other shifts

Asked 6× in all

4 Apr 2026, Shift 2 · Q33Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R Assertion A: If the average kinetic…EasyAssertion–reason
9 Apr 2024, Shift 2 · Q41The temperature of a gas is $-78^\circ$ C and the average translational kinetic energy of its molecules is K. The temperature at which the…EasySingle correct
31 Jan 2024, Shift 1 · Q39The parameter that remains the same for molecules of all gases at a given temperature is :EasySingle correct
8 Apr 2023, Shift 2 · Q33The temperature at which the kinetic energy of oxygen molecules becomes double than its value at $27^\circ$ C isEasySingle correct
25 Jul 2022, Shift 1 · Q38Following statements are given : (A) The average kinetic energy of a gas molecule decreases when the temperature is reduced. (B) The…EasyOther

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.