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Thermodynamics

# Which of the following is zero during adiabatic expansion of gas?

$\begin {array} {1 1} (A)\;\Delta T & \quad (B)\;\Delta S \\ (C)\;\Delta U & \quad (D)\;none\: of \: these \end {array}$

Since, in an adiabatic process, entropy remains constant.
Ans : (B)