JEE Main 2014PhysicsThermodynamicsMediumMCQ

JEE Main 2014 — Thermodynamics Question with Solution

JEE Main 2014 (19 Apr Online)

Question

A monoatomic gas is compressed from a volume of 2 m3 to a volume of 1 m3 at a constant pressure of 100 N m2. Then it is heated at constant volume by supplying 150 J of energy. As a result, the internal energy of the gas

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Show full solutionCorrect option: B
Correct answer
BIncreases by 250 J

Step-by-step explanation

Isobaric process with Q=0

∴ 0=W+ΔU

∴ 0=PΔV+ΔU

∴ ΔU=-PΔV

      =-1001-2 J

      ΔU=100 J

Constant volume with Q=150 J

Q=0+ΔU

∴ ΔU2=150J

∴ ΔU=ΔU1+ΔU2

               = + 2 5 0 J

Hence, internal energy increases by 250 J

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About this question

This is a previous-year question from JEE Main 2014, 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.