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Saturday, 31 October

JEE Main · Physics · Gravitation

Binary Star Systems

JEE Main asked Binary Star Systems 3 times in 3 of the 108 shifts Lumi analysed, in 2021 and 2023. It belongs to Orbital Mechanics, in Gravitation (Physics). The longest wait between two years asking it was 2 years. In 2021 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
2021
last in 2023
Pattern
Occasional
across the analysed shifts

Questions on this idea a shift, by year

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

00.050.10’170’200.07’210’220.07’230’240’250’26

Raw count: 2017: 0 in 1 shift · 2020: 0 in 12 shifts · 2021: 2 in 24 shifts · 2022: 0 in 24 shifts · 2023: 1 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
  • 20231 of 12
  • 20220 of 24
  • 20212 of 24
  • 20200 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: calculation.

  • Speed of bodies in mutual circular orbit
  • Angular speed of two bodies in mutual orbit

Difficulty

Easy 0Medium 3Hard 0

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. 15 Apr 2023, Shift 1 · Q36Two identical particles each of mass 'm' go round a circle of radius aa under the action of their mutual gravitational attraction. The…MediumSingle correct
  2. 24 Feb 2021, Shift 1 · Q2Two stars of masses m and 2m at a distance d rotate about their common centre of mass in free space. The period of revolution is :MediumSingle correct
  3. 3 Aug 2021, Shift 2 · Q26Two particles of equal mass 'm' go round a circle of radius RR under the action of their mutual gravitational attraction. The speed of…MediumNumerical value

Shifts: 24 Feb 2021, Shift 1, 3 Aug 2021, Shift 2, 15 Apr 2023, Shift 1.

Same topic

Other ideas in Orbital Mechanics

Orbital Mechanics has 18 ideas JEE Main has asked; 8 of them came up in more than one question. The 12 most asked are below.

Topic analysisChapter analysisStudy this chapterAll repeated ideas