JEE Main 2024 · PhysicsMultiple choiceSingle correctEasyCalculation

JEE Main 1 February 2024, Shift 1, Physics Q39

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

Two moles a monoatomic gas is mixed with six moles of a diatomic gas. The molar specific heat of the mixture at constant volume is :

(1) $\frac{5}{2}R$
(2) $\frac{9}{4}R$ Official answer
(3) $\frac{3}{2}R$
(4) $\frac{7}{4}R$

Official answer

Option 2

NTA final key.

Chapter: Kinetic Theory
Topic: Kinetic Theory of Gases
Idea tested: Internal Energy of Gas Mixtures

Same idea in other shifts

Asked 7× in all

31 Jan 2024, Shift 2 · Q39A gas mixture consists of 8 moles of argon and 6 moles of oxygen at temperature T. Neglecting all vibrational modes, the total internal…EasySingle correct
10 Apr 2023, Shift 2 · Q33A gas mixture consists of 2 moles of oxygen and 4 moles of neon at temperature T. Neglecting all vibrational modes, the total internal…EasySingle correct
29 Jul 2022, Shift 1 · Q54One mole of a monoatomic gas is mixed with three moles of a diatomic gas. The molecular specific heat of mixture at constant volume is…MediumNumerical value
17 Mar 2021, Shift 1 · Q15Two ideal polyatomic gases at temperatures $T_1$ and $T_2$ are mixed so that there is no loss of energy. If $F_1$ and $F_2$ , $m_1$ and…MediumSingle correct
2 Sep 2020, Shift 1 · Q9A gas mixture consists of 3 moles of oxygen and 5 moles of argon at temperature $T$ . Assuming the gases to be ideal and the oxygen bond to…EasySingle correct
4 Sep 2020, Shift 1 · Q23A closed vessel contains 0.1 mole of a monatomic ideal gas at 200 K. If 0.05 mole of the same gas at 400 K is added to it, the final…EasyNumerical value

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.