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Saturday, 31 October

JEE Main · Physics · System of Particles and Rotational Motion

MOI of Composite Bodies

JEE Main asked MOI of Composite Bodies 6 times in 6 of the 108 shifts Lumi analysed, in 2020, 2021, 2022, 2023 and 2025. It belongs to Moment of Inertia, in System of Particles and Rotational Motion (Physics). The longest wait between two years asking it was 2 years. In 2025 it came in more than one shift of the same year.

Updated 2026-10-24

Times asked
6
in 6 shifts
Years
5 of 8
First asked
2020
last in 2025
Pattern
Asked most years
across the analysed shifts

Questions on this idea a shift, by year

2017–2026. Asked in 2020, 2021, 2022, 2023 and 2025. Years differ in how many shifts Lumi analysed, so each year is scaled to one shift of 25 Physics questions.

00.150.30’170.08’200.03’210.03’220.07’230’240.25’250’26

Raw count: 2017: 0 in 1 shift · 2020: 1 in 12 shifts · 2021: 1 in 24 shifts · 2022: 1 in 24 shifts · 2023: 1 in 12 shifts · 2024: 0 in 18 shifts · 2025: 2 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
  • 20252 of 8
  • 20240 of 18
  • 20231 of 12
  • 20221 of 24
  • 20211 of 24
  • 20201 of 12
  • 20170 of 1

Asked in that shift More than once Not asked

How JEE Main framed it

Numerical value is the usual form. Skill tested: multi-step.

  • Moment of inertia of system of bodies about axis
  • Moment of inertia of rearranged rod

Difficulty

Easy 0Medium 4Hard 2

4 of the 6 questions had a numerical answer.

Every question

All 6 questions

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

  1. 7 Apr 2025, Shift 1 · Q46A, B and C are disc, solid sphere and spherical shell respectively with same radii and masses. These masses are placed as shown in figure.…HardNumerical valueHas a figure
  2. 2 Apr 2025, Shift 1 · Q32Moment of inertia of a rod of mass 'M' and length 'L' about an axis passing through its center and normal to its length is 'α\alpha'. Now…MediumSingle correct
  3. 6 Apr 2023, Shift 1 · Q60Two identical solid spheres each of mass 2 kg and radii 10 cm are fixed at the ends of a light rod. The separation between the centres of…MediumNumerical value
  4. 28 Jul 2022, Shift 1 · Q60Four identical discs each of mass 'M' and diameter 'a' are arranged in a small plane as shown in figure. If the moment of inertia of the…MediumNumerical valueHas a figure
  5. 26 Aug 2021, Shift 1 · Q22Consider a badminton racket with length scales as shown in the figure. If the mass of the linear and circular portions of the badminton…HardNumerical valueHas a figure
  6. 9 Jan 2020, Shift 1 · Q4Three solid spheres each of mass m and diameter d are stuck together such that the lines connecting the centres form an equilateral…MediumSingle correctHas a figure

Shifts: 9 Jan 2020, Shift 1, 26 Aug 2021, Shift 1, 28 Jul 2022, Shift 1, 6 Apr 2023, Shift 1, 2 Apr 2025, Shift 1, 7 Apr 2025, Shift 1.

Same topic

Other ideas in Moment of Inertia

Moment of Inertia has 18 ideas JEE Main has asked; 9 of them came up in more than one question. The 12 most asked are below.

Topic analysisChapter analysisStudy this chapterAll repeated ideas