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Tea kept in a thermos flask is vigorously shaken If the...

This question belongs to Chemical Engineering Chemical Engineering Thermodynamics
Chemical Engineering Thermodynamics
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Tea kept in a thermos flask is vigorously shaken. If the tea is considered as a system, then its temperature will

Answer & Solution
Correct Answer: Option A
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.
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