Directions for: The questions consist of two statements each, printed as assertion and reason. While answering these questions you are required to choose any one of the following five responses A. If both the Assertion and the Reason are true and the Reason is a correct explanation of the Assertion. B. If both the Assertion and the Reason are true but the Reason is not a correct explanation of Assertion. C. If the Assertion is true but the Reason is false. D. If both the Assertion and the Reason are false. E. If Assertion is false but Reason is true.
Assertion: Work done by an ideal gas during reversible isothermal expansion is zero. Reason: In vacuum external pressure against which expansion occur is zero.A) A
B) B
C) C
D) D
E) E
Correct Answer: A
Solution :
It is true that work done during reversible isothermal expansion of an ideal gas is zero because external pressure (P) is zero. \[w=-P\Delta V\] in vacuum \[P=0\] \[\Rightarrow \] \[w=0\]
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