1.

Stirrer work supplied to liquid in insulating chamber increases its temperature from T1 to T2. The change in entropy of universe will be:[Where, Cp – specific heat of liquid]

A. Zero
B. \({C_p}\;In\frac{{{T_2}}}{{{T_1}}}\)
C. Negative
D. \({C_p}In\frac{{{T_1}}}{{{T_2}}}\)
Answer» C. Negative


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