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Thermal Physics JEE

Forming a total of 10% of the entire Physics, this unit has some very important chapters. 3 questions appear every year from this unit but it has a distinct distribution when it comes to individual chapters. KTG & Thermodynamics is the bread and butter of the unit and must not be ignored at any cost while the other two are optional. Thermodynamics is also essential in the subject of chemistry.

Thermal Physics JEE Chapter Wise Overview

Number of questions asked in each chapter of Thermal Physics JEE from 2010 to 2020 in JEE


JEE Physics Chapter-wise weightage of Thermal Physics 2020

Let's find out the chapter-wise weightage of the unit Thermal Physics

Chapters Weightage
Kinetic Theory of Gases 2.67
Thermodynamics 6.33


List of important topics for Thermal Physics JEE

  • Heat Transfer
  • Newton's Law of Cooling
  • First Law of Thermodynamics and Heat Capacity
  • Second Law of Thermodynamics
  • Temperature and Thermal Expansion
  • Reversible and Irreversible Processes
  • Carnot Engine
  • Specific Heat Capacity and Mean Free Path

Thermal Physics JEE Syllabus 2023,2024

  • Thermal equilibrium, zeroth law of thermodynamics, the concept of temperature.
  • Heat, work and internal energy.
  • The first law of thermodynamics.
  • The second law of thermodynamics: reversible and irreversible processes.
  • Carnot engine and its efficiency.
  • Equation of state of a perfect gas, work done on compressing a gas Kinetic theory of gases - assumptions, the concept of pressure.
  • Kinetic energy and temperature: RMS speed of gas molecules: Degrees of freedom.
  • Law of equipartition of energy, applications to specific heat capacities of gases; Mean free path.
  • Avogadro's number.

Thermal Physics JEE Video Lectures

Thermal Physics JEE Books

List of Chapters of Thermal Physics  
1-Thermometry and thermal expension Download
2-Thermodymanics Download
3-Kinetic Theory of Gases Download
4-Heat Transfer Download
5-Calorimetry Download

Thermal Physics JEE Test Series 2022,2023,2024

List of FREE Thermal Physics Tests  
Paper set 1 (Easy) Download Questions Download Solutions
Paper set 2 (Moderate) Download Questions Download Solutions
Paper set 3 (Difficult) Download Questions Download Solutions

Question on Thermal Physics for JEE Main and Advanced.

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Two slabs and B of different materials but of the same thickness are joined as shown in Fig. 8.8. The thermal conductivities of A and B are k1and k2 respectively. The thermal conductivity of the composite slab will be



An ideal mono-atomic gas is taken around the cycle ABCDA as shown in the P-V diagram. The work done during the cycle is given by



A cyclic process ABCD is shown in the V – T diagram. Which of the following curves represent the same process ?



A monatomic ideal gas, initially at temperature  is enclosed in a cylinder fitted with a frictionless piston. The gas is allowed to expand adiabatically to a temperature  by releasing the piston suddenly. If  are the lengths of the gas column, before and after expansion, respectively, then  is given by


A copper rod (initially at room temperature ) of non-uniform cross section is placed between a steam chamber at  and ice water chamber at  A and B are cross sections as shown in Fig. Then match the statement in Column I with results in Column II comparing only between cross sectionA and B, (The mathematical expressions in Column I have their usual meanings in heat transfer.)





 Initially rate of heat flow    will be


 Maximum at section A


 At steady state rate of heat  flow  will be


 Maximum at section B


 At steady state temperature  gradient  will be


 Minimum at section B


 At steady state rate of  change of temperature  will be


 Same for all section


Q. Which all topics are included in Thermal physics for JEE?

Thermal Physics includes the following topics 1. Calorimetry and thermal Exapansion 2. KTG and Thermodynamics 3. Heat Tranfer

Q. What is the weightage of thermal physics in JEE main?

Thermal physics carries a weightage of 10% 3 questions comes from this topic every year. Thermodynamics is the most important chapter in Thermal Physics.

Q. which are the important topics in thermodynamics for JEE?

1. Heat Transfer 2. Newton's Law of Cooling 3. First Law of Thermodynamics and Heat Capacity 4. Second Law of Thermodynamics 5. Temperature and Thermal Expansion 6. Reversible and Irreversible Processes 7. Carnot Engine 8. Specific Heat Capacity and Mean Free Path

Q. How many questions are asked from thermal physics in JEE?

3 to 4 questions are asked every year from thermal physics in JEE Main and 2 to 3 in JEE advance