Thermodynamics is concerned with $.......$.

Which of the following is an extensive property of a system?

$A$ state function is .......

For a massless piston undergoing an expansion of $\Delta V$ at constant temperature against a variable external pressure $P$,which equation represents the work done?

An adiabatic process is experienced by a/an ...... system.

Identify the correct statements from the following.
$(I)$ For adiabatic process,$\Delta U = W_{\text{adiabatic}}$
$(II)$ Work is a path function.
$(III)$ Volume is an extensive property.