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Saturday, 31 October

JEE Main · Physics · Thermodynamics

Mayer's Relation (Cp and Cv)

JEE Main asked Mayer's Relation (Cp and Cv) 3 times in 3 of the 108 shifts Lumi analysed, in 2017, 2024 and 2026. It belongs to First Law of Thermodynamics, in Thermodynamics (Physics). The longest wait between two years asking it was 7 years, across 2018 and 2019, which Lumi has no shifts for.

Updated 2026-10-24

Times asked
3
in 3 shifts
Years
3 of 8
First asked
2017
last in 2026
Pattern
Frequent
across the analysed shifts

Questions on this idea a shift, by year

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

00.510.83’170’200’210’220’230.05’240’250.11’26

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

Shift by shift

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

  • 20261 of 9
  • 20250 of 8
  • 20241 of 18
  • 20230 of 12
  • 20220 of 24
  • 20210 of 24
  • 20200 of 12
  • 20171 of 1

Asked in that shift More than once Not asked

How JEE Main framed it

Single correct is the usual form. Skill tested: multi-step.

  • Change in internal energy at constant volume
  • Relation of cp-cv for two gases

Difficulty

Easy 1Medium 1Hard 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. 2 Apr 2026, Shift 2 · Q485 moles of unknown gas is heated at constant volume from 10°C to 20°C. The molar specific heat of this gas at constant pressure cp=8c_p = 8…MediumNumerical value
  2. 6 Apr 2024, Shift 1 · Q36The specific heat at constant pressure of a real gas obeying PV2=RTPV^2 = RT equation is:HardSingle correct
  3. 2 Apr 2017 (offline) · Q10CpC_p and CvC_v are specific heats at constant pressure and constant volume respectively. It is observed that Cp−Cv=aC_p - C_v = a for hydrogen…EasySingle correct

Shifts: 2 Apr 2017 (offline), 6 Apr 2024, Shift 1, 2 Apr 2026, Shift 2.

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