Physics · JEE

Important Questions: Kinetic Theory of Gases for JEE

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The most important Kinetic Theory of Gases questions for JEE cover conceptual traps, standard results, and numerical patterns from Equation of state of a perfect gas, work done on compressing a gas, Kinetic theory of gases: assumptions, the concept of pressure, kinetic interpretation of temperature, RMS speed of gas molecules, degrees of freedom, Law of equipartition of energy and applications to specific heat capacities of gases, and more. Goodmarks provides 32+ high-yield MCQs with full solutions.

Focus on what matters most. These important Kinetic Theory of Gases questions cover high-weightage concepts from Equation of state of a perfect gas, work done on compressing a gas, Kinetic theory of gases: assumptions, the concept of pressure, kinetic interpretation of temperature, RMS speed of gas molecules, degrees of freedom, Law of equipartition of energy and applications to specific heat capacities of gases, and more — the topics JEE repeats every year.

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Subtopics in Kinetic Theory of Gases

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Q1PhysicsUnit 9: Kinetic Theory of Gases

In Maxwell's velocity distribution curve area under the graph

Q2PhysicsUnit 9: Kinetic Theory of Gases

A gas has an average speed of

10 \mathrm{m} / \mathrm{s}

and a collision frequency of

10 s^{-1} .

What is its mean free path?

Q3PhysicsUnit 9: Kinetic Theory of Gases

Assertion Vibrational energy of diatomic molecule corresponding to each degree of freedom is

k_{B} T

Reason For every molecule, vibrational degree of freedom is 2

Q4PhysicsUnit 9: Kinetic Theory of Gases

A sample of

O_{2}

gas and a sample of hydrogen gas both have the same no. of moles, the same volume and same pressure. Assuming them to be perfect gases, the ratio of temperature of oxygen gas to the temperature of hydrogen gas is :

Q5PhysicsUnit 9: Kinetic Theory of Gases

If for a gas

\frac{\boldsymbol{R}}{\boldsymbol{C}_{\boldsymbol{v}}}=\mathbf{0 . 6 7},

then the gas is made up of molecules which are :

Q6PhysicsUnit 9: Kinetic Theory of Gases

Equal masses of

\mathrm{N}_{2}

and

\mathrm{O}_{2}

gases are filled in vessels

A

and

B

. The volume of vessel B is double of A. The ratio of pressure in vessel

A

and

B

will be

Q7PhysicsUnit 9: Kinetic Theory of Gases

In a gas equation,

P V=R T, V

refers to the volume of:

Q8PhysicsUnit 9: Kinetic Theory of Gases

According to Charles law,

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Frequently asked questions

What makes a Kinetic Theory of Gases question "important" for JEE?

Important questions test core concepts that appear frequently across JEE Main and Advanced papers — definitions, standard formulas, and classic problem types.

Which subtopics in Kinetic Theory of Gases are high-weightage?

Key areas include Equation of state of a perfect gas, work done on compressing a gas, Kinetic theory of gases: assumptions, the concept of pressure, kinetic interpretation of temperature, RMS speed of gas molecules, degrees of freedom, Law of equipartition of energy and applications to specific heat capacities of gases, and more. Prioritise these before moving to edge cases.

How many important questions should I revise?

Revise 30–50 important MCQs per unit in the last month before JEE. Focus on questions you got wrong at least once.

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Pro users can filter by unit and subtopic to target high-yield areas. Free users can attempt sample questions on this page.