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Saturday, 31 October

JEE Main · Chemistry · Thermodynamics (Chemistry)

Work and Heat in Isothermal Processes

JEE Main asked Work and Heat in Isothermal Processes 4 times in 4 of the 108 shifts Lumi analysed, in 2022, 2024 and 2025. It belongs to First Law of Thermodynamics, in Thermodynamics (Chemistry) (Chemistry). The longest wait between two years asking it was 2 years. In 2022 it came in more than one shift of the same year.

Updated 2026-10-24

Times asked
4
in 4 shifts
Years
3 of 8
First asked
2022
last in 2025
Pattern
Comes in cycles
across the analysed shifts

Questions on this idea a shift, by year

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

00.10.20’170’200’210.07’220’230.05’240.13’250’26

Raw count: 2017: 0 in 1 shift · 2020: 0 in 12 shifts · 2021: 0 in 24 shifts · 2022: 2 in 24 shifts · 2023: 0 in 12 shifts · 2024: 1 in 18 shifts · 2025: 1 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
  • 20251 of 8
  • 20241 of 18
  • 20230 of 12
  • 20222 of 24
  • 20210 of 24
  • 20200 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: calculation.

  • Heat supplied to gas against spring piston
  • Heat exchanged in constant pressure isothermal compression

Difficulty

Easy 2Medium 1Hard 1

3 of the 4 questions had a numerical answer.

Every question

All 4 questions

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

  1. 3 Apr 2025, Shift 1 · Q35A piston of mass M is hung from a massless spring whose restoring force law goes as F=−kx3F = -kx^3, where k is the spring constant of…HardDiagram basedHas a figure
  2. 4 Apr 2024, Shift 2 · Q83Three moles of an ideal gas are compressed isothermally from 60 L to 20 L using constant pressure of 5 atm. Heat exchange Q for the…EasyNumerical value
  3. 30 Jun 2022, Shift 1 · Q831.0 mol of monoatomic ideal gas is expanded from state 1 to state 2 as shown in the figure. The magnitude of the work done for the…MediumNumerical valueHas a figure
  4. 27 Jun 2022, Shift 2 · Q84When 5 moles of He gas expand isothermally and reversibly at 300 K from 10 litre to 20 litre, the magnitude of the maximum work obtained…EasyNumerical value

Shifts: 27 Jun 2022, Shift 2, 30 Jun 2022, Shift 1, 4 Apr 2024, Shift 2, 3 Apr 2025, Shift 1.

Same topic

Other ideas in First Law of Thermodynamics

First Law of Thermodynamics has 21 ideas JEE Main has asked; 10 of them came up in more than one question. The 12 most asked are below.

Topic analysisChapter analysisStudy this chapterAll repeated ideas