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Saturday, 31 October

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 (γ=53)\left(\gamma = \frac{5}{3}\right) is mixed with two moles of a diatomic gas (γ=75)\left(\gamma = \frac{7}{5}\right), the value of adiabatic exponent γ\gamma for the mixture is
  1. (1)1.401.40
  2. (2)1.521.52Official answer
  3. (3)1.751.75
  4. (4)1.351.35

Official answer

Option 2

NTA final key.

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

Same idea in other shifts

Asked 2× in all
  1. 8 Jan 2020, Shift 2 · Q8Consider a mixture of n moles of helium gas and 2n moles of oxygen gas (molecules taken to be rigid) as an ideal gas. Its CP/CVC_P/C_V value…MediumSingle correct

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