NEET UG · Physics · Kinetic Theory

Mean Free Path

NEET asked Mean Free Path twice, in 2020 and 2026: 2 of the 1,875 questions in the 10 papers from 2017–2026. It belongs to Kinetic Theory of Gases, in Kinetic Theory (Physics). The longest wait between two papers asking it was 6 years.

Updated 2026-10-08

Times asked: 2; in 2017–2026
Papers: 2; of 10
First asked: 2020; last in 2026
Chance next paper: 6%; calibrated historical rate

Questions on this idea, by paper

2017–2026. 2020 and 2026.

How NEET framed it

Numerical is the usual form. Skill tested: calculation.

Recall formula for mean free path
Numerical

Chance asked next paper 6%

Every question

All 2 questions

From the official NEET UG papers, newest first. Open one for the full question, the options and the official answer.

2026 Q 2 The mean free path of molecules in an ideal gas A is half that of another ideal gas B. The diameter of the spherical molecules of gas A is\dots Numerical \cdot Medium 2020 Q 155 The mean free path for a gas, with molecular diameter d and number density n can be expressed as : One-line MCQ \cdot Medium

Papers: NEET 2020, NEET 2026.

Same topic

Other ideas in Kinetic Theory of Gases

Kinetic Theory of Gases has 5 ideas NEET has asked; 5 of them came up in more than one question.

Ideal Gas Equation5× · 2025
Degrees of Freedom and Internal Energy3× · 2026
RMS Speed of Molecules2× · 2023
Molecular Kinetic Energy and Temperature2× · 2020

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