NDA 2019 Physics question

If the work done on the system or by the system is zero, which one of the following statements for a gas kept at a certain temperature is correct ?

(A)Change in internal energy of the system is equal to flow of heat in or out of the system.Correct
(B)Change in internal energy of the system is less than heat transferred.
(C)Change in internal energy of the system is more than the heat flow.
(D)Cannot be determined.

Answer: (A)

Solution

By the first law of thermodynamics, . If , then $Δ U =

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Question ID VK-031460