A given system undergoes a change in which the work done by the system equals the decrease in its internal energy. The system must have undergone an
Isothermal change
Adiabatic change
Isobaric change
Isochoric change
In adiabatic change Q = constant ⇒ΔQ=0
So ΔW=−ΔU(∵ΔQ=ΔU+ΔW)