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Saturday, 31 October

JEE Main · Physics · Mechanical Properties of Fluids

Splitting and Coalescence

JEE Main asked Splitting and Coalescence 10 times in 10 of the 108 shifts Lumi analysed, in 2021, 2022, 2024, 2025 and 2026. It belongs to Surface Tension, in Mechanical Properties of Fluids (Physics). The longest wait between two years asking it was 2 years. In 2022, 2024 and 2026 it came in more than one shift of the same year.

Updated 2026-10-24

Times asked
10
in 10 shifts
Years
5 of 8
First asked
2021
last in 2026
Pattern
Asked most years
across the analysed shifts

Questions on this idea a shift, by year

2017–2026. Asked in 2021, 2022, 2024, 2025 and 2026. Years differ in how many shifts Lumi analysed, so each year is scaled to one shift of 25 Physics questions.

00.150.30’170’200.03’210.10’220’230.14’240.13’250.22’26

Raw count: 2017: 0 in 1 shift · 2020: 0 in 12 shifts · 2021: 1 in 24 shifts · 2022: 3 in 24 shifts · 2023: 0 in 12 shifts · 2024: 3 in 18 shifts · 2025: 1 in 8 shifts · 2026: 2 in 9 shifts.

Shift by shift

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

  • 20262 of 9
  • 20251 of 8
  • 20243 of 18
  • 20230 of 12
  • 20223 of 24
  • 20211 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.

  • Surface energy ratio on coalescence
  • Surface energy change on drop splitting

Difficulty

Easy 6Medium 4Hard 0

3 of the 10 questions had a numerical answer.

Every question

All 10 questions

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

  1. 5 Apr 2026, Shift 2 · Q33Eight mercury drops, each of radius rr, coalesce to form a bigger drop. The surface energy released in this process is __________. (S is…EasySingle correct
  2. 2 Apr 2026, Shift 1 · Q45A liquid drop of diameter 22 mm breaks into 512512 droplets. The change in surface energy is α×10−6\alpha\times10^{-6} J. The value of…EasySingle correct
  3. 2 Apr 2025, Shift 2 · Q31Two water drops each of radius rr coalesce to form a bigger drop. If TT is the surface tension, the surface energy released in this…EasySingle correct
  4. 30 Jan 2024, Shift 2 · Q53A big drop is formed by coalescing 1000 small identical drops of water. If E1E_1 be the total surface energy of 1000 small drops of water…EasyNumerical value
  5. 1 Feb 2024, Shift 2 · Q37A big drop is formed by coalescing 1000 small droplets of water. The surface energy will become :EasySingle correct
  6. 6 Apr 2024, Shift 1 · Q54A big drop is formed by coalescing 1000 small droplets of water. The ratio of surface energy of 1000 droplets to that of energy of big…EasyNumerical value
  7. 28 Jun 2022, Shift 1 · Q36A water drop of diameter 2 cm is broken into 64 equal droplets. The surface tension of water is 0.075 N/m. In this process the gain in…MediumSingle correct
  8. 30 Jul 2022, Shift 2 · Q27A water drop of radius 1 cm is broken into eight equal droplets. Surface tension of water is 0.075 N m −1^{-1}. The gain in surface energy…MediumNumerical value
  9. 26 Jul 2022, Shift 1 · Q45A water drop of radius 1 cm is broken into 729 equal droplets. If surface tension of water is 75 dyne/cm, then the gain in surface energy…MediumSingle correct
  10. 26 Feb 2021, Shift 1 · Q6A large number of water drops, each of radius r, combine to have a drop of radius R. If the surface tension is T and mechanical equivalent…MediumSingle correct

Shifts: 26 Feb 2021, Shift 1, 28 Jun 2022, Shift 1, 26 Jul 2022, Shift 1, 30 Jul 2022, Shift 2, 30 Jan 2024, Shift 2, 1 Feb 2024, Shift 2, 6 Apr 2024, Shift 1, 2 Apr 2025, Shift 2, 2 Apr 2026, Shift 1, 5 Apr 2026, Shift 2.

Same topic

Other ideas in Surface Tension

Surface Tension has 18 ideas JEE Main has asked; 5 of them came up in more than one question. The 12 most asked are below.

Topic analysisChapter analysisStudy this chapterAll repeated ideas