Class 11 Physics — Chapter 13: Kinetic Theory
66 practice questions · 22 Easy · 22 Medium · 22 Hard
Practise Class 11 Physics Chapter 13, "Kinetic Theory", with 66 NCERT-aligned multiple-choice questions. The set is split into 22 Easy, 22 Medium and 22 Hard questions, so you can warm up on the fundamentals and then push into the exam-level problems that separate top scorers in CBSE Board exams, JEE Main, JEE Advanced and NEET UG.
"Kinetic Theory" is one of the chapters where numerical problem-solving, derivations and conceptual application really pays off. Each MCQ on this chapter is timed and uses exam-grade marking (+2 correct, −1 wrong, 0 skipped), training the same accuracy-under-pressure that real papers demand. Every question carries a short explanation, so a wrong answer becomes a quick lesson rather than a dead end — the fastest way to close gaps before a test.
Use this chapter as targeted revision: attempt the Easy set first to confirm your basics on Kinetic Theory, then move to Medium and Hard to test application and problem-solving. Your accuracy, streaks and XP save automatically, and the chapter feeds into your overall Class 11 Physics mastery score. A few sample questions are shown below; sign in free to practise all 66.
Key concepts: Kinetic Theory (Class 11 Physics)
This chapter explains gas behaviour from the molecular viewpoint — the kinetic theory of gases, pressure, temperature, and degrees of freedom.
- Kinetic theory assumptions
- Gas molecules are tiny, in constant random motion, with negligible volume and elastic collisions.
- Pressure of a gas
- Arises from molecular collisions with the walls; P = ⅓ρ⟨v²⟩ links pressure to mean-square speed.
- Temperature & KE
- Average translational kinetic energy per molecule is (3/2)kT — temperature is a measure of molecular KE.
- Degrees of freedom & equipartition
- Energy is shared equally as ½kT per degree of freedom; this gives the specific heats of gases.
- Mean free path
- The average distance a molecule travels between collisions; decreases with density and molecular size.
Key formulas — Kinetic Theory
💡 Exam tips for Kinetic Theory
- Temperature depends only on the average kinetic energy of molecules, not on the gas type.
- Use the equipartition theorem (½kT per degree of freedom) to find Cv and Cp for different gases.
Sample questions
Ideal gas equation:
Universal gas law.
RMS speed of gas molecules ∝
v_rms = √(3RT/M).
Degrees of freedom of a monoatomic ideal gas:
Only 3 translational.
Kinetic Theory — FAQs
What are the key concepts in Class 11 Physics Kinetic Theory?+
This chapter explains gas behaviour from the molecular viewpoint — the kinetic theory of gases, pressure, temperature, and degrees of freedom. Key ideas include Kinetic theory assumptions, Pressure of a gas, Temperature & KE, Degrees of freedom & equipartition, Mean free path.
What does Class 11 Physics Chapter 13 (Kinetic Theory) cover on XamBaaz?+
It covers 66 NCERT-aligned MCQs on "Kinetic Theory" — 22 Easy, 22 Medium and 22 Hard — each with a timed quiz and an instant explanation, suitable for CBSE Board exams, JEE Main, JEE Advanced and NEET UG.
Are these "Kinetic Theory" questions free to practise?+
Yes — sign in with Google to practise "Kinetic Theory" free. Full unlimited access is ₹999/year (limited-time launch price), with no per-chapter charges.
How should I revise "Kinetic Theory" for the exam?+
Start with the Easy quiz to confirm your fundamentals, then attempt Medium and Hard for application-level practice. Review each explanation, retry the questions you miss, and track your accuracy on this chapter until it is consistently high.
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