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Saturday, 31 October

JEE Main · Physics · Kinetic Theory

Relaxation Time

JEE Main asked Relaxation Time 3 times in 3 of the 108 shifts Lumi analysed, all in 2020. It belongs to Kinetic Theory of Gases, in Kinetic Theory (Physics). In 2020 it came in more than one shift of the same year.

Updated 2026-10-24

Times asked
3
in 3 shifts
Years
1 of 8
First asked
2020
the only year
Pattern
Gone quiet
across the analysed shifts

Questions on this idea a shift, by year

2017–2026. Asked in 2020. Years differ in how many shifts Lumi analysed, so each year is scaled to one shift of 25 Physics questions.

00.150.30’170.25’200’210’220’230’240’250’26

Raw count: 2017: 0 in 1 shift · 2020: 3 in 12 shifts · 2021: 0 in 24 shifts · 2022: 0 in 24 shifts · 2023: 0 in 12 shifts · 2024: 0 in 18 shifts · 2025: 0 in 8 shifts · 2026: 0 in 9 shifts.

Shift by shift

Each square is one analysed shift, in date order. Open a filled one for that paper.

  • 20260 of 9
  • 20250 of 8
  • 20240 of 18
  • 20230 of 12
  • 20220 of 24
  • 20210 of 24
  • 20203 of 12
  • 20170 of 1

Asked in that shift More than once Not asked

How JEE Main framed it

Single correct is the usual form. Skill tested: conceptual.

  • Dependence of mean collision time on temperature
  • Graph interpretation of kinetic theory quantity

Difficulty

Easy 0Medium 3Hard 0

Every question was multiple choice.

Every question

All 3 questions

From the official JEE Main shift papers, newest first. Open one for the full question, the options and the official answer.

  1. 6 Sep 2020, Shift 2 · Q9In a dilute gas at pressure P and temperature T, the mean time between successive collisions of a molecule varies with T as :MediumSingle correct
  2. 9 Jan 2020, Shift 2 · Q10Two gases - argon (atomic radius 0.07 nm, atomic weight 40) and xenon (atomic radius 0.1 nm, atomic weight 140) have the same number…MediumSingle correct
  3. 8 Jan 2020, Shift 1 · Q9The plot that depicts the behavior of the mean free time τ\tau (time between two successive collisions) for the molecules of an ideal…MediumDiagram basedHas a figure

Shifts: 8 Jan 2020, Shift 1, 9 Jan 2020, Shift 2, 6 Sep 2020, Shift 2.

Same topic

Other ideas in Kinetic Theory of Gases

Kinetic Theory of Gases has 22 ideas JEE Main has asked; 14 of them came up in more than one question. The 12 most asked are below.

Topic analysisChapter analysisStudy this chapterAll repeated ideas