JEE Main 2021ChemistryThermodynamics (C)EasyNumerical

JEE Main 2021 — Thermodynamics (C) Question with Solution

JEE Main 2021 (25 Jul Shift 2)

Question

A system does 200 J of work and at the same time absorbs 150 J of heat. The magnitude of the change in internal energy is  ______J. (Nearest integer)

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Show full solutionCorrect answer: 50
Correct answer
50

Step-by-step explanation

w=-200 J,q=+150:ΔU=q+w

ΔU=150-200=-50 J: magnitude =50 J=|ΔU|

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About this question

This is a previous-year question from JEE Main 2021, covering the Thermodynamics (C) chapter of Chemistry. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.