Question

A process in which pressure remains constant, is called:

• A. isochoric process
• B. isothermal process
• C. adiabatic process
• D. isobaric process

Answer 1

The correct option is D isobaric process

An isobaric process is a thermodynamic process in which pressure stays constant i.e $\Delta P=0$.
An isochoric process is a thermodynamic process during which the volume of the closed system undergoing such a process remains constant.
An isothermal process is a change of a system, in which the temperature remains constant i.e. $\Delta T=0$.
An adiabatic process is one that occurs without transfer of heat or matter between a thermodynamic system and its surroundings.
Hence, the answer is option $D$.