JEE Main 2024 · PhysicsMultiple choiceSingle correctEasyCalculation

JEE Main 27 January 2024, Shift 1, Physics Q38

Question 38 of 90 in this shift, Physics question 8 of 30, Section A.

0.08 kg air is heated at constant volume through 5°C. The specific heat of air at constant volume is 0.17 kcal/kg°C and J = 4.18 joule/cal. The change in its internal energy is approximately.

(1)142 J
(2)284 JOfficial answer
(3)298 J
(4)318 J

Official answer

Option 2

NTA final key.

Chapter: Thermodynamics
Topic: First Law of Thermodynamics
Idea tested: Internal Energy Calculation

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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 108 of the 174 JEE Main shifts held from 2017 to 2026.