JEE Main 2020PhysicsKinetic Theory of GasesEasyMCQ

JEE Main 2020 — Kinetic Theory of Gases Question with Solution

JEE Main 2020 (05 Sep Shift 1)

Question

Number of molecules in a volume of 4 cm3 of a perfect monoatomic gas at some temperature T and at a pressure of 2 cm of mercury is close to? (Given, mean kinetic energy of a molecule (at T) is 4×10−14 erg, g=980 cm s-2 density of mercury =13.6 g cm-3)

Choose an option

Show full solutionCorrect option: A
Correct answer
A4.8×1018

Step-by-step explanation

N=PVKT

U=32KT

∴  N=3PV2U=3.99×1018

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About this question

This is a previous-year question from JEE Main 2020, covering the Kinetic Theory of Gases 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.