JEE Main 2026 · 4 Apr · Shift 2 · Physics Q33

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PhysicsSingle correct+4 / -1Question 33 of 75

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R

Assertion A: If the average kinetic energy of $\ce{H2}$ and $\ce{O2}$ molecules, kept in two different sized containers are same, then their temperatures will be same.

Reason R: The r.m.s. speed of $\ce{H2}$ and $\ce{O2}$ molecules are same at same temperature.

Choose the correct answer from the options given below

Both A and R are true and R is the correct explanation of A

Both A and R are true but R is NOT the correct explanation of A

A is true but R is false

A is false but R is true

Answer and worked solution

Official answer: C

Assertion. The average kinetic energy $\frac32kT$ depends only on temperature, so equal average KE means equal temperature: true.

Reason. $v_\text{rms}=\sqrt{3RT/M}$ differs for $\ce{H2}$ and $\ce{O2}$ at the same T: false.

(C)

Topics:Kinetic interpretation of temperature Molecular speeds

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JEE Main 2026 · 4 Apr · Shift 2, Physics question 33