Tea kept in a thermos flask is vigorously shaken. If the tea is considered as a system, then its temperature will

A Increase
B Decrease
C Remain unchanged
D First fall and then rise

Correct Answer: Increase

As thermos flask is insulated no heat energy added or taken from the system so, by first law of thermodynamics we can write $$dU = - \delta W$$   as we work done on the system is negative so, the internal energy will be positive. And therefore there will be a raise in temperature.
Bissoy MCQ
#Chemical Engineering #Chemical Engineering Thermodynamics

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