NEET Physics Question - Thermal Physics

Assertion (A): The area of entropy versus temperature graph of a cyclic process, is equal to work done.

Reason (R): Change in internal energy of cyclic process is zero.

(1) Both (A) & (R) are true and the (R) is the correct explanation of the (A)

(2) Both (A) & (R) are true but the (R) is not the correct explanation of the (A)

(3) (A) is true but (R) is false

(4) Both (A) and (R) are false

Solution:

Concept: T-S diagram and cyclic processes. The area enclosed by a (T-S) diagram for a cyclic process represents the net heat exchanged, ( Q_{net} ), not the work done. For a cyclic process, ( Delta U = 0 ) is true, but Assertion (A) is false. Therefore, both (A) and (R) are false in relation to the explanation.

Rankers Physics

Entropy-Temperature Graph

Solution:

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