A system that does NOT allow exchange of heat with its surrounding is called

Explanation:

Adiabatic process:

• When a thermodynamic system undergoes a change in such a way that no exchange of heat takes place between Systems and surroundings, the process is known as an adiabatic process.
• During the adiabatic process, there is no exchange of heat that takes place between the system and surroundings.

i.e. ΔQ = 0.

Additional Information

• Isothermal process: When a thermodynamic system undergoes a physical change in such a way that its temperature remains constant, then the change is known as an isothermal process.
• Isobaric process: When a thermodynamic system undergoes a physical change in such a way that its pressure remains constant, then the change is known as the isobaric process.
• Isochoric process: When a thermodynamic process undergoes a physical change in such a way that its volume remains constant, then the change is known as the isochoric process.

Isentropic process: 

• In the Isentropic process, the state of entropy is constant.
• That is why it is also known as a constant-entropy process.
• This process is both reversible as well as adiabatic.
• In the adiabatic process, there is no transfer of heat or matter.
• It is an idealized thermodynamic process in thermodynamics.

Entropy: It is the measure of thermal energy of a system per unit temperature that is unavailable for doing useful work.

• In simple words entropy of the world keeps increasing because we move far away from equilibrium every second.