Direction for: In each of the following questions a statement of Assertion is given followed by a corresponding statement of Reason just below it. Of the statements mark the correct answer as
Assertion: In an isolated system the entropy increases. Reason: The processes in an isolated system are adiabatic.A) If both assertion and reason are true and the reason is the correct explanation of assertion.
B) If both assertion and reason are true but the reason is not the correct explanation of the assertion.
C) If assertion is true statement but reason is false.
D) If both assertion and reason are false.
Correct Answer: B
Solution :
Since, heat flow from hotter to colder bodies is irreversible, reversible processes must involve heat flow between bodies of the same temperature. It follows that any entropy change of the system must be exactly balanced by that of the heat bath which provided the heat. Thus, the entropy change of the universe during eversible processes is zero. During an adiabatic process no heat flows. Thus, we see that the entropy change of a system during for a reversible, adiabatic process is zero. Bui note that both qualifiers are needed; the entropy of a non-isolated system change during a reversible process (and the entropy change of the surrounding will compensate), and an irreversible change to an isolated system will increase the entropy. Hence, option (b) is true.
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