JEE Main 2023PhysicsThermodynamicsHardMCQ

JEE Main 2023 — Thermodynamics Question with Solution

JEE Main 2023 (24 Jan Shift 1)

Question

1 g of a liquid is converted to vapour at 3×105 Pa pressure. If 10% of the heat supplied is used for increasing the volume by 1600 cm3 during this phase change, then the increase in internal energy in the process will be :

Choose an option

Show full solutionCorrect option: A
Correct answer
A4320 J

Step-by-step explanation

As pressure against which expansion is happening is constant, work done can be written as =PΔV

=3×105×1600×10-6

=480 J
As only 10% of heat is used in work done.
Hence ΔQ=W0.1=4800 J
The rest goes in increase in internal energy, which is 90% of heat.
Change in internal energy =0.9×4800=4320 J

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About this question

This is a previous-year question from JEE Main 2023, covering the Thermodynamics chapter of Physics. 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.