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JEE Main 2026 · PhysicsNumerical answerNumerical valueMediumMulti-step

JEE Main 2 April 2026, Shift 2, Physics Q48

Question 48 of 75 in this shift, Physics question 23 of 25, Section B.

5 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

c_p = 8

cal/mol. °C and

R = 8.36

J/(mol.°C). The change in the internal energy of the gas is

Official answer

300

NTA final key.

Chapter: Thermodynamics
Topic: First Law of Thermodynamics
Idea tested: Mayer's Relation (Cp and Cv)

Same idea in other shifts

Asked 2× in all

2 Apr 2017 (offline) · Q10 $C_p$ and $C_v$ are specific heats at constant pressure and constant volume respectively. It is observed that $C_p - C_v = a$ for hydrogen…EasySingle correct

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.