A closed system is cooled reversibly from 100¬¨‚àûC to 50¬¨‚ – McqOptions

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1.	A closed system is cooled reversibly from 100¬¨‚àûC to 50¬¨‚àûC. If no work is done on the system?
A.	Its internal energy (U) decreases and its entropy (S) increases
B.	U and S both decreases
C.	U decreases but S is constant
D.	U is constant but S decreases
Answer» C. U decreases but S is constant

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