Home/
Competitive Exams/
JEE Main & Advanced/
Physics/
Kinetic Theory and Thermodynamics/
Question 31068
JEE Physics · Medium

Kinetic Theory and Thermodynamics: Mean Free Path MCQ

Solve this quality-checked JEE multiple-choice question, then review the correct answer and explanation.

Timer-based practiceDetailed answer reviewMobile-friendly flow
Mean Free PathMediumQuestion 31068

Question

Viscosity of a gas is independent of pressure because as pressure increases:
  1. A
    Temperature increases
  2. B
    Mean free path decreases but number density increases — effects cancel
    Correct
  3. C
    Molecules become larger
  4. D
    Gas becomes ideal

Correct answer

Mean free path decreases but number density increases — effects cancel

Explanation

η ∝ (number density) × (mean free path). These have opposite dependencies on P and their product is constant.

Review Kinetic Theory and Thermodynamics notesStart timed chapter practice