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A thermos flask contains coffee. It is v...

A thermos flask contains coffee. It is vigorously sheken, considering the coffee as the system. (a) Does its temperature rise ? (b) Has heat been added to it ? (c ) Has work been done on it ?

A

decreases

B

increases

C

remains same

D

decreases if temperature is below `4^(@)C` and increses if temperature is equal to or more than `4^(@)C`

Text Solution

Verified by Experts

The correct Answer is:
B
We know that there is no loss of heat in an ideal flask. Therefore mechanical energy wasted in shaking is changed into heat and hence, temperature rises.
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