Isothermal Process MCQ - Practice Questions with Answers

Isothermal process - When a thermodynamic system undergoes a thermodynamic process in such a way that its temperature remains constant, then that process is called an Isothermal process.

So, T = constant and .

Trick to recognize isothermal process -

• The walls of the container must be perfectly conducting (no resistance) which allows the exchange of heat between the gas and surroundings.

• The process of compression or expansion should be infinitely slow so that the process gets proper time for the exchange of heat.

 Equation of isothermal process - 

As we know that the equation of state is given by -

If T = constant and for a particular amount of gas ‘n’ is also constant.

So we can write that -

Points in graph of isothermal process - 

i) Curves obtained on P-V graph are called isotherms and the graphs are hyperbolic in nature.

ii) Slope of isothermal curve : 

     By differentiating PV = C

iii) The area between the isothermal curve and volume axis represents the work done in the isothermal process.

The formula of Work done in the isothermal process -