Kinetic Theory of Gases Weightage in JEE Main 2025

Kinetic Theory of Gases Weightage in JEE Main 2025: The physics chapters occupy prime significance in the JEE Main exam. Aspirants are required to prepare for all the subjects in the appropriate manner. JEE Main 2025 aspirants must be aware of the chapter-wise weightage for each subject for effective preparation. Some topics with high weightage in the physics syllabus are Motion and Equilibrium, Mechanics, Master Forces etc. whereas chapters such as Kinetic Theory of Gases carry a weightage of a minimum of 2 questions (2%) in the JEE Main 2025 exam . Though the weightage of the Kinetic theory of gases may seem small, the concepts from it often overlap with other topics such as Thermodynamics, making it necessary for the candidates to have a solid understanding. The Kinetic theory of gases chapter is important as it deals with understanding the correct approaches and techniques necessary for excelling in the JEE Main Physics paper. Candidates can check the weightage and chapters in the Kinetic Theory of Gases in the article.

Latest update: JEE Main 2025 exam dates have been announced by NTA! JEE Main 2025 exam will be conducted from January 22 to 31, 2025.

Also Read : JEE Main 2025 Exam Pattern :

An Overview of Kinetic Theory of Gases

The Kinetic Theory of Gases refers to a theoretical model which describes the molecular composition of the gas in terms of a large number of submicroscopic particles, which comprises atoms and molecules. Moreover, the theory states that gas pressure arises due to particles colliding with each other and the walls of the container. The Kinetic theory of gases describes properties such as temperature, volume and pressure, in addition to transport properties such as viscosity thermal conductivity and mass diffusivity. The theory describes all the properties which are related to the microscopic phenomenon.

The importance of the theory lies in the fact that it helps in developing a correlation between the macroscopic properties and the microscopic phenomenon. In simple terms, the kinetic theory of gases also helps candidates study the action of the molecules. Generally, the molecules of gases are always in motion, and they tend to collide with each other and the walls of the containers. In addition, the theory also helps in understanding related phenomena, like the Brownian motion.

Assumptions of Kinetic Theory of Gases

• The collisions between gas molecules or between a molecule and the container are completely elastic.
• The mass of gas molecules is negligible. Hence, the effect of gravity and gravitational force on each other can be neglected.
• The Volume of molecules is considered to be negligible.
• Collision between molecules is governed by Newton’s Law of Motion (i.e. Net force = Change in momentum per unit time)
• The interaction force between particles is negligible. (That is, they exert no forces on one another.)
• Molecules are considered to be in constant, random, and rapid motion. So, the average velocity of particles in all the 3-directions will be zero i.e. = ==0

Expected Kinetic Theory of Gases Weightage in JEE Mains 2025

Candidates can check this table to learn about the expected Kinetic Theory of Gases Weightage in the JEE Main 2025 Exam.

Kinetic Theory of Gases Weightage in JEE Main Exam of Previous Years'

Check the table below to know the previous years' weightage for the Kinetic Theory of Gases chapter from the physics syllabus.

Best Books for JEE Main 2025 Physics

Physics is one of the toughest papers to crack in the JEE Main exam, as it consists of its fundamental concepts. Below mentioned are a few of the Best Books for the JEE Main 2025 Physics section, which can help the candidates score better marks in the JEE Main Physics exam.

• Understanding Physics for JEE Main and JEE Advanced by DC Pandey
• Fundamentals of Physics (Author: Halliday, Resnick, and Walker)
• Understanding Physics Electricity and Magnetism by DC Pandey
• Advanced Physics (Author: Nelkon and Parker)
• Concepts of Physics (Volume 1 and 2) by H C Verma
• Complete Physics for JEE main by I E Irodov
• Problems in General Physics by I E Irodov
• Problems in Physics (Author: AA Pinsky)
• Objective Questions on Physics- Chapterwise Solved Papers (Author: D.C. Pandey)
• Feynman Lectures on Physics (Author: Feynman, Leighton, and Sands)

Type of Kinetic Theory of Gases Questions in JEE Main 2025

• The Kinetic theory of gases questions in the JEE Main exam often involve numerical problems based upon the application of the ideal gas law, calculation of the RMS speed, and key concepts of the mean free path.
• Certain questions from the Kinetic theory of gases can test one’s understanding of the theoretical concepts like the assumptions of the kinetic theory and their implications.
• Sometimes, the Kinetic theory of gases questions may be connected with the topic of Thermodynamics, for instance, associating it with laws of thermodynamics or specific heat capacities of gases.

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