In Adiabatic ΔQ=0,i.e., Exchange of heat does not take place.
In Isothermal ΔU=0,i.e., Temperature does not change therefore internal energy also remains constant.
In Isochoric ΔW=0,i.e., Volume remains constant therefore work done is zero.
In Isobaric ΔU=0,ΔW=0,ΔQ=0
W=P.ΔV, Volume changes so work done is not equal to zero.
ΔU=2fPΔV, Volume changes therefore internal energy changes.
ΔQ=nCpΔT, Temperature changes therefore heat also changes.