Class 11 Physics MCQ Chapter 13 Kinetic Theory
Are you searching for Class 11 Physics MCQ Chapter 13 Kinetic Theory English Medium? Then you are in the right place. This article provides important multiple-choice questions (MCQs) with answers to help AHSEC Higher Secondary First Year students prepare effectively for their Physics examinations.
The chapter Kinetic Theory explains the microscopic behavior of gases and the relationship between the motion of molecules and macroscopic properties such as pressure and temperature. Students will learn about the basic assumptions of the kinetic theory of gases, molecular motion, gas laws, kinetic energy of molecules, root mean square speed, and the connection between temperature and molecular energy. These concepts form the foundation of modern thermodynamics and statistical physics.
The MCQs included here are prepared according to the latest AHSEC syllabus and examination pattern. They are designed to help students revise important concepts, strengthen problem-solving skills, and become familiar with objective questions commonly asked in examinations. Regular practice can improve conceptual understanding and exam performance.
Whether you are preparing for class tests, annual examinations, or the AHSEC HS First Year Final Examination, these MCQ solutions will help you revise the chapter efficiently and achieve better results in Physics.
Part II
Class 11 Physics MCQ Chapter 13 Kinetic Theory
VSA & MCQs
I. Very Short Answer (VSA) Questions with Answers
Q. What is the kinetic theory of gases?
Ans: The theory that explains the properties of gases based on the motion of molecules is called the kinetic theory of gases.
Q. What is an ideal gas?
Ans: A gas which obeys all gas laws at all temperatures and pressures is called an ideal gas.
Q. What is the pressure of a gas?
Ans: The pressure of a gas is due to continuous collisions of molecules with the container walls.
Q. What is absolute zero temperature?
Ans: The lowest possible temperature at which molecular motion nearly stops.
Q. What is the kinetic energy of gas molecules due to?
Ans: Due to their random motion.
Q. What is RMS speed?
Ans: RMS speed is the square root of the mean of the squares of molecular speeds.
Q. What is the Boltzmann constant?
Ans: The Boltzmann constant relates the average kinetic energy with temperature.
Q. What is Avogadro’s number?
Ans: The number of molecules present in one mole of substance.
Q. What is Brownian motion?
Ans: Random zig-zag motion of suspended particles in a fluid.
Q. What causes Brownian motion?
Ans: Continuous collisions of fluid molecules.
Q. What is mean free path?
Ans: Average distance travelled by a molecule between two successive collisions.
Q. What is degree of freedom?
Ans: Number of independent ways in which a molecule can possess energy.
Q. How many degrees of freedom does a monoatomic gas have?
Ans: Three.
Q. What is equipartition of energy?
Ans: Energy is equally distributed among all degrees of freedom.
Q. What is the ratio (\gamma)?
Ans: Ratio of specific heat at constant pressure to specific heat at constant volume.
Q. On what factor does average kinetic energy depend?
Ans: Absolute temperature.
Multiple Choice Questions (MCQs)
Q. Kinetic theory explains properties of:
(a) Solids
(b) Liquids
(c) Gases
(d) Metals
Ans: (c) Gases
Q. The ideal gas equation is:
(a) (PV=T)
(b) (PV=nRT)
(c) (P=nRT)
(d) (V=nRT)
Ans: (b) (PV=nRT)
Q. Gas pressure is due to:
(a) Weight of gas
(b) Molecular collisions
(c) Gravity
(d) Density
Ans: (b) Molecular collisions
Q. The average kinetic energy of gas molecules depends on:
(a) Pressure
(b) Volume
(c) Temperature
(d) Density
Ans: (c) Temperature
Q. RMS speed of gas molecules increases with:
(a) Decrease in temperature
(b) Increase in temperature
(c) Decrease in pressure
(d) Increase in density
Ans: (b) Increase in temperature
Q. Brownian motion supports:
(a) Atomic nature of matter
(b) Wave theory
(c) Gravitation
(d) Magnetism
Ans: (a) Atomic nature of matter
Q. Mean free path is the average distance between:
(a) Two molecules
(b) Two walls
(c) Two collisions
(d) Two temperatures
Ans: (c) Two collisions
Q. The degree of freedom of a monoatomic gas is:
(a) 1
(b) 2
(c) 3
(d) 5
Ans: (c) 3
Q. For an ideal gas, internal energy depends upon:
(a) Pressure only
(b) Volume only
(c) Temperature only
(d) Density only
Ans: (c) Temperature only
Q. Which gas law states that pressure is inversely proportional to volume?
(a) Charles’ law
(b) Boyle’s law
(c) Avogadro’s law
(d) Gay-Lussac’s law
Ans: (b) Boyle’s law
Q. Which quantity is proportional to average kinetic energy?
(a) Density
(b) Temperature
(c) Pressure
(d) Volume
Ans: (b) Temperature
Q. RMS speed is highest for:
(a) Heavy gases
(b) Light gases
(c) Liquids
(d) Solids
Ans: (b) Light gases
Q. Equipartition of energy means:
(a) Unequal distribution of energy
(b) Equal distribution among degrees of freedom
(c) No energy distribution
(d) Random energy loss
Ans: (b) Equal distribution among degrees of freedom
Q. Which of the following is not an assumption of kinetic theory?
(a) Molecules are in random motion
(b) Molecular collisions are elastic
(c) Molecules attract strongly
(d) Gas molecules occupy negligible volume
Ans: (c) Molecules attract strongly
Q. Which motion is observed in suspended particles?
(a) Circular motion
(b) Brownian motion
(c) Projectile motion
(d) Uniform motion
Ans: (b) Brownian motion
Q. Which gas has the maximum RMS speed at the same temperature?
(a) Oxygen
(b) Hydrogen
(c) Nitrogen
(d) Carbon dioxide
Ans: (b) Hydrogen
Q. The pressure exerted by an ideal gas is due to:
(a) Gravitational force
(b) Molecular impacts
(c) Magnetic force
(d) Electrostatic force
Ans: (b) Molecular impacts
Q. Increasing temperature increases:
(a) Average kinetic energy
(b) Molecular mass
(c) Density only
(d) Pressure only
Ans: (a) Average kinetic energy
Q. Monoatomic gases possess only:
(a) Rotational energy
(b) Translational energy
(c) Vibrational energy
(d) Potential energy only
Ans: (b) Translational energy
Q. The kinetic theory assumes molecular collisions are:
(a) Inelastic
(b) Perfectly elastic
(c) Partially elastic
(d) Random only
Ans: (b) Perfectly elastic
Q. The universal gas constant is the same for:
(a) One gas only
(b) Liquids only
(c) All ideal gases
(d) Solids only
Ans: (c) All ideal gases
Q. The relation between pressure and kinetic energy is given by:
(a) Newton’s law
(b) Kinetic theory equation
(c) Hooke’s law
(d) Ohm’s law
Ans: (b) Kinetic theory equation
Q. At absolute zero temperature, molecular motion becomes:
(a) Maximum
(b) Infinite
(c) Minimum
(d) Random only
Ans: (c) Minimum
Q. Assertion (A): Gas pressure is caused by collisions of molecules with container walls.
Reason (R): Gas molecules are in continuous random motion.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
Ans: (a) Both A and R are true and R is the correct explanation of A.
Q. Assertion (A): The average kinetic energy of gas molecules increases with temperature.
Reason (R): Temperature is a measure of average kinetic energy.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
Ans: (a) Both A and R are true and R is the correct explanation of A.
Q. Assertion (A): Brownian motion supports the molecular theory of matter.
Reason (R): Suspended particles are continuously bombarded by molecules.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
Ans: (a) Both A and R are true and R is the correct explanation of A.
Q. Assertion (A): The RMS speed of lighter gases is higher.
Reason (R): RMS speed is inversely proportional to the square root of molar mass.
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
Ans: (a) Both A and R are true and R is the correct explanation of A.
Q. Assertion (A): Ideal gas molecules do not exert intermolecular forces.
Reason (R): The volume of gas molecules is negligible.
(a) Both A and R are true but R is not the correct explanation of A.
(b) Both A and R are true and R is the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
Ans: (a) Both A and R are true but R is not the correct explanation of A.
Q. Assertion (A): The internal energy of an ideal gas depends only on temperature.
Reason (R): Internal energy is due to the kinetic energy of molecules.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
Ans: (a) Both A and R are true and R is the correct explanation of A.
Q. Assertion (A): At absolute zero, molecular motion becomes minimum.
Reason (R): The kinetic energy of molecules decreases with temperature.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
Ans: (a) Both A and R are true and R is the correct explanation of A.
