Check the statement are trrue or false :

$1.$ The change in internal energy $\Delta U = 0$ in a cyclic process.

$2.$ In an adiabatic process temperature remains constant.

$3.$ The internal energy of a system during isothermal process decreases.

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$1$ true

$2$ false . amount of heat remains constant.

$3$ false . internal energy remains constant.

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For adiabatic process, wrong statement is

The process in which no heat enters or leaves the system is termed as