Q.

In which of the following processes, heat is neither absorbed nor released by a system               [2019]

1 isochoric  
2 isothermal  
3 adiabatic  
4 isobaric  

Ans.

(3)

Adiabatic process is the process in which no exchange of heat energy takes place between the gas and the surroundings,

i.e., ΔQ = 0.