Chapter Exam

Chapter-12 Kinetic Theory — Online MCQ Test

Q: What is Avogadro's number?

Answer: A. 6.02 × 10²³ mol⁻¹ — Avogadro's number is a fundamental constant equal to 6.02 × 10²³ mol⁻¹, representing the number of particles in one mole.

Q: The equation of state for an ideal gas is:

Answer: A. PV = nRT — The ideal gas equation is PV = nRT, where P is pressure, V is volume, n is number of moles, R is gas constant, and T is temperature.

Q: For a diatomic gas at room temperature, the degrees of freedom are:

Answer: A. 5 — A diatomic gas has 3 translational and 2 rotational degrees of freedom (rotation about two axes perpendicular to molecular axis), totaling 5.

PHYSICS · Grade 11 · CBSE(NCERT)

Practice Chapter-12 Kinetic Theory with a free chapter-wise online MCQ test for CBSE(NCERT) Grade 11 PHYSICS. This chapter covers: Equation of state - Perfect gas - Kinetic model - Gas pressure - Kinetic interpretation of temperature - RMS speed - Degrees of freedom - Law of equipartition of energy - Specific.... AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter-12 Kinetic Theory — Important Questions & Answers (FAQ)

Frequently asked questions from CBSE(NCERT) Grade 11 PHYSICS — Chapter-12 Kinetic Theory, with answers and explanations. These are sample questions; the exam has its own separate question set.

What is Avogadro's number?

A. 6.02 × 10²³ mol⁻¹ ✓
B. 6.02 × 10²² mol⁻¹
C. 3.14 × 10²³ mol⁻¹
D. 1.38 × 10⁻²³ mol⁻¹

Answer: A. 6.02 × 10²³ mol⁻¹
Avogadro's number is a fundamental constant equal to 6.02 × 10²³ mol⁻¹, representing the number of particles in one mole.

The equation of state for an ideal gas is:

A. PV = nRT ✓
B. PV = RT
C. P = nRT
D. V = nRT/P²

Answer: A. PV = nRT
The ideal gas equation is PV = nRT, where P is pressure, V is volume, n is number of moles, R is gas constant, and T is temperature.

For a diatomic gas at room temperature, the degrees of freedom are:

A. 5 ✓
B. 3
C. 6
D. 7

Answer: A. 5
A diatomic gas has 3 translational and 2 rotational degrees of freedom (rotation about two axes perpendicular to molecular axis), totaling 5.

Which statement about the relationship between pressure and molecular kinetic energy is correct?

A. Pressure is directly proportional to average kinetic energy of molecules ✓
B. Pressure is inversely proportional to average kinetic energy
C. Pressure is independent of molecular kinetic energy
D. Pressure depends only on the number of molecules, not their energy

Answer: A. Pressure is directly proportional to average kinetic energy of molecules
From kinetic theory, P = (1/3)ρ<c²> ∝ <KE>, showing direct proportionality between pressure and average molecular kinetic energy.

A sealed container with fixed volume contains a gas. If the molecular mass of the gas is doubled while keeping the number of molecules and temperature constant, the pressure will:

A. Remain unchanged because PV = nRT and none of these change ✓
B. Increase by a factor of 2
C. Decrease by a factor of √2
D. Become indeterminate without knowing specific volume

Answer: A. Remain unchanged because PV = nRT and none of these change
Pressure from ideal gas law P = nRT/V depends only on n, R, T, and V—not on molecular mass. Molecular mass affects RMS speed but not pressure.