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Friday, 16 October

JEE Main 2026 · PhysicsMultiple choiceSingle correctHardMulti-step

JEE Main 6 April 2026, Shift 2, Physics Q30

Question 30 of 75 in this shift, Physics question 5 of 25, Section A.

A cylinder with adiabatic walls is closed at both ends and is divided into two compartments by a frictionless adiabatic piston. Ideal gas is filled in both (left and right) the compartments at same PP, VV, TT. Heating is started from left side until pressure changes to 27P8\frac{27P}{8}. If initial volume of each compartment was 9 litres then the final volume in right-hand side compartment is __________ litres. (for this ideal gas CP/CV=1.5C_P/C_V=1.5)
  1. (1)3
  2. (2)4Official answer
  3. (3)14
  4. (4)9

Official answer

Option 2

NTA final key.

Chapter
Thermodynamics
Topic
Thermodynamic Processes
Idea tested
Adiabatic Process Analysis

Same idea in other shifts

Asked 8× in all
  1. 2 Apr 2025, Shift 1 · Q31In an adiabatic process, which of the following statements is true ?EasySingle correct
  2. 2 Apr 2025, Shift 2 · Q32Identify the characteristics of an adiabatic process in a monoatomic gas. (A) Internal energy is constant. (B) Work done in the process is…MediumOther
  3. 8 Apr 2025, Shift 2 · Q33A monoatomic gas having γ=53\gamma = \frac{5}{3} is stored in a thermally insulated container and the gas is suddenly compressed to…EasySingle correct
  4. 9 Apr 2024, Shift 1 · Q38A sample of 11 mole gas at temperature T is adiabatically expanded to double its volume. If adiabatic constant for the gas is…MediumSingle correct
  5. 9 Apr 2024, Shift 1 · Q39The volume of an ideal gas (γ=1.5\gamma=1.5) is changed adiabatically from 55 litres to 44 litres. The ratio of initial pressure to final…EasySingle correct
  6. 25 Jul 2022, Shift 1 · Q37A certain amount of gas of volume VV at 27∘27^\circC temperature and pressure 2×107 Nm−22\times10^{7}\ \mathrm{Nm^{-2}} expands isothermally until…MediumSingle correct
  7. 18 Mar 2021, Shift 1 · Q4The P-V diagram of a diatomic ideal gas system going under cyclic process as shown in figure. The work done during an adiabatic process CD…MediumSingle correctHas a figure

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 42 of the 174 JEE Main shifts held from 2017 to 2026.