JEE Main 2024 · PhysicsMultiple choiceSingle correctMediumCalculation

JEE Main 30 January 2024, Shift 2, Physics Q39

Question 39 of 90 in this shift, Physics question 9 of 30, Section A.

If three moles of monoatomic gas

\left(\gamma = \frac{5}{3}\right)

is mixed with two moles of a diatomic gas

\left(\gamma = \frac{7}{5}\right)

, the value of adiabatic exponent

\gamma

for the mixture is

(1) $1.40$
(2) $1.52$ Official answer
(3) $1.75$
(4) $1.35$

Official answer

Option 2

NTA final key.

Chapter: Thermodynamics
Topic: Kinetic Theory of Gases
Idea tested: Adiabatic Exponent of Gas Mixtures

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