JEE Main 2020 · PhysicsMultiple choiceOtherMediumConceptual

JEE Main 2 September 2020, Shift 2, Physics Q9

Question 9 of 75 in this shift, Physics question 9 of 25.

An ideal gas in a closed container is slowly heated. As its temperature increases, which of the following statements are true ? (A) the mean free path of the molecules decreases. (B) the mean collision time between the molecules decreases. (C) the mean free path remains unchanged. (D) the mean collision time remains unchanged.

(1)(A) and (B)
(2)(A) and (D)
(3)(B) and (C)Official answer
(4)(C) and (D)

Official answer

Option 3

NTA final key (Sep 2020).

Chapter: Kinetic Theory
Topic: Kinetic Theory of Gases
Idea tested: Mean Free Path

Same idea in other shifts

Asked 6× in all

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16 Mar 2021, Shift 2 · Q7Calculate the value of mean free path ( $\lambda$ ) for oxygen molecules at temperature $27^\circ\mathrm{C}$ and pressure $1.01\times10^5$ …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.