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

Solution (By Examveda Team)

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.