NCERT Solutions for Class 11 Physics Chapter 12 – Thermodynamics

NCERT Solutions, for Class 11 Physics Chapter 12 Thermodynamics are the best study material that can help you prepare the chapter well. Our subject matter experts have thoroughly explained all the concepts, exercises and formulae of the chapter in these solutions. All the solutions have been explained in the simplified language for you to understand better and grasp the concepts easily. 

Chapter 12 of NCERT Textbook for Class 11 explains the concept of heat and temperature and their relation to energy, work, radiation and properties of matter. This chapter also thoroughly explains the different laws of Thermodynamics for you to gain a better knowledge of the related concepts.  There are a total of 10 questions given at the end of the chapter.

Our experts bring these NCERT solutions with the step by step explanations for all questions. The aim is to reassure that as a learner, you are groomed to develop a logical sense of learning the Physics concepts. You must study this chapter in-depth to understand it well. A summary of the chapter is given below for your reference.

Important Topics in NCERT Solutions for Class 11 Physics Chapter 12 Thermodynamics

NCERT Solutions for Class 11 Physics Chapter 12 is important as it applies to a wide variety of topics in science and engineering streams, especially associated subjects like Physical Chemistry, Chemical Engineering and Mechanical Engineering amongst others. Study of topics like Heat, Quasi-static Process, Adiabatic Process, Isochoric Process and Cyclic Process will be done through this chapter. 


Thermodynamics, as discussed in the chapter, is the branch of physics that deals with the concept of heat and temperature besides the interconversion of heat and other forms of energy. It is a macroscopic science. It deals with the bulk systems and does not go into the molecular constitution of matter.

The Distinction between Thermodynamics and Mechanics

Another important section covered in the chapter talks about the distinction between Thermodynamics and mechanics. In Mechanics, our interest is in the motion of particles or bodies under the action of forces whereas Thermodynamics is not concerned with the motion of the system as a whole.

Thermal Equilibrium

Two physical systems are in the thermal equilibrium if there is no net flow of thermal energy between them when they are connected by a path permeable to heat. Thermal Equilibrium obeys the Zeroth Law of Thermodynamics.

Zeroth Law of Thermodynamics

The Zeroth Law of Thermodynamics as mentioned in the chapter states that if two thermodynamics systems are each in thermal equilibrium with a third one, then they are in thermal equilibrium with each other.

First Law of Thermodynamics

The First Law of Thermodynamics, if given by the following equation

∆Q= ∆U+ ∆W 

where ∆Q is the heat supplied to the system by the surroundings, ∆W is the work done by the system on the surroundings and ∆U is the change in the internal energy of the system.

Work by the pioneers of thermodynamics, Lord Kelvin and others is mentioned in this chapter to explain the diverse field of Thermodynamics. The diagrammatic and graphical representation of processes and machines amongst, etc., involved in Thermodynamics has been explained in this chapter for you to understand the phenomenon better. This chapter covers many important topics which are quite interesting to study.

Important Formulae Covered in Chapter 12 Thermodynamics

  • Heat Capacity

where ∆Q is the amount of heat supplied to a substance and ∆T is the change in its temperature.

  • The first law of thermodynamic

∆Q= ∆U+ ∆W 

Exercise Discussion for NCERT Solutions for Class 11 Physics Chapter 12

  • NCERT Solutions for Class 11 Physics Chapter 12 consists of 10 questions. Most of them are numerical-based and test your understanding of the formulae of the chapter. 
  • You need to find out the rate of heat consumption, work done, the pressure of the gas, the temperature of the gas, internal energy etc. 
  • In the theory-based questions, you need to explain why the pressure of a car increases during driving, how the climate of the desert is different from that of a town close to the sea etc. 
  • For solving the questions, you need to have a thorough understanding of the chapter.

Benefits of NCERT Solutions for Class 11 Physics Chapter 12 by Instasolv

These NCERT Solutions prepared by Instasolv for Class 11 Physics Chapter 12 Thermodynamics are a perfect guide to refer to while you are preparing for your physics subject from your NCERT textbook. As this chapter is scoring it is better to get all your concepts cleared to solve the exercises with confidence. It will prove helpful for you to score well. We, at Instasolv, provide you with solutions with detailed explanations. It becomes further comprehensible for you as real-life examples are presented for your better understanding.