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Saturday, 31 October

JEE Main · Physics · System of Particles and Rotational Motion

COM of Cavity Bodies

JEE Main asked COM of Cavity Bodies 3 times in 3 of the 108 shifts Lumi analysed, in 2020 and 2021. It belongs to Center of Mass, in System of Particles and Rotational Motion (Physics). The longest wait between two years asking it was 1 year. In 2020 it came in more than one shift of the same year.

Updated 2026-10-24

Times asked
3
in 3 shifts
Years
2 of 8
First asked
2020
last in 2021
Pattern
Gone quiet
across the analysed shifts

Questions on this idea a shift, by year

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

00.10.20’170.17’200.03’210’220’230’240’250’26

Raw count: 2017: 0 in 1 shift · 2020: 2 in 12 shifts · 2021: 1 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
  • 20211 of 24
  • 20202 of 12
  • 20170 of 1

Asked in that shift More than once Not asked

How JEE Main framed it

Diagram based is the usual form. Skill tested: application.

  • Centre of mass of disc with circular hole
  • Centre of mass of disk with cut-out

Difficulty

Easy 0Medium 2Hard 1

1 of the 3 questions had a numerical answer.

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. 4 Aug 2021, Shift 1 · Q13Choose the correct option for the centre of mass of a uniform disc of radius ‘R’ from which a circular section of radius r (2r < R) has…MediumSingle correct
  2. 2 Sep 2020, Shift 2 · Q22A square shaped hole of side l=a2l = \frac{a}{2} is carved out at a distance d=a2d = \frac{a}{2} from the centre ‘O’ of a uniform circular…MediumNumerical valueHas a figure
  3. 8 Jan 2020, Shift 2 · Q4As shown in fig. when a spherical cavity (centred at O) of radius 1 is cut out of a uniform sphere of radius R (centred at C), the centre…HardDiagram basedHas a figure

Shifts: 8 Jan 2020, Shift 2, 2 Sep 2020, Shift 2, 4 Aug 2021, Shift 1.

Same topic

Other ideas in Center of Mass

Center of Mass has 13 ideas JEE Main has asked; 5 of them came up in more than one question.

Topic analysisChapter analysisStudy this chapterAll repeated ideas