JEE Main 2021 · PhysicsMultiple choiceSingle correctEasyConceptual

JEE Main 18 March 2021, Shift 2, Physics Q11

Question 11 of 90 in this shift, Physics question 11 of 30, Section A.

An ideal gas in a cylinder is separated by a piston in such a way that the entropy of one part is

S_1

and that of the other part is

S_2

. Given that

S_1 > S_2

. If the piston is removed then the total entropy of the system will be :

(1) $S_1\times S_2$
(2) $S_1-S_2$
(3) $S_1+S_2$ Official answer
(4) $\frac{S_1}{S_2}$

Official answer

Option 3

NTA final key.

Chapter: Thermodynamics
Topic: Second Law and Entropy
Idea tested: Extensive Nature of Entropy

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