JEE Main 2025 · PhysicsMultiple choiceSingle correctEasyConceptual

JEE Main 2 April 2025, Shift 1, Physics Q31

Question 31 of 75 in this shift, Physics question 6 of 25, Section A.

In an adiabatic process, which of the following statements is true ?

(1)Work done by the gas equals the increase in internal energy
(2)The internal energy of the gas decreases as the temperature increases
(3)The molar heat capacity is zeroOfficial answer
(4)The molar heat capacity is infinite

Official answer

Option 3

NTA final key.

Chapter: Thermodynamics
Topic: Thermodynamic Processes
Idea tested: Adiabatic Process Analysis

Same idea in other shifts

Asked 8× in all

6 Apr 2026, Shift 2 · Q30A cylinder with adiabatic walls is closed at both ends and is divided into two compartments by a frictionless adiabatic piston. Ideal gas…HardSingle correct
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
8 Apr 2025, Shift 2 · Q33A monoatomic gas having $\gamma = \frac{5}{3}$ is stored in a thermally insulated container and the gas is suddenly compressed to…EasySingle correct
9 Apr 2024, Shift 1 · Q38A sample of $1$ mole gas at temperature T is adiabatically expanded to double its volume. If adiabatic constant for the gas is…MediumSingle correct
9 Apr 2024, Shift 1 · Q39The volume of an ideal gas ( $\gamma=1.5$ ) is changed adiabatically from $5$ litres to $4$ litres. The ratio of initial pressure to final…EasySingle correct
25 Jul 2022, Shift 1 · Q37A certain amount of gas of volume $V$ at $27^\circ$ C temperature and pressure $2\times10^{7}\ \mathrm{Nm^{-2}}$ expands isothermally until…MediumSingle correct
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.