JEE Main 2026 · PhysicsMultiple choiceSingle correctMediumApplication

JEE Main 4 April 2026, Shift 1, Physics Q35

Question 35 of 75 in this shift, Physics question 10 of 25, Section A.

One gas of

n_1

mole of molecules at temperature

T_1

, volume

V_1

, and pressure

P_1

, and another gas of

n_2

mole of molecules at temperature

T_2

, volume

V_2

, and pressure

P_2

, are mixed resulting in pressure

P

and volume

V

of the mixture. The temperature of the mixture is ______.

(1) $(T_1+T_2)/2$
(2) $T_1T_2PV/(T_2P_1V_1+T_1P_2V_2)$ Official answer
(3) $(T_2P_1V_1+T_1P_2V_2)/(T_1T_2PV)$
(4) $|T_1-T_2|/2$

Official answer

Option 2

NTA final key.

Chapter: Kinetic Theory
Topic: Ideal Gas Laws
Idea tested: Mixing Gases from Different Vessels

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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.