Kinetic Theory Quiz - CBSE Class 11 Science

Free practice quiz: Kinetic Theory (CBSE Class 11 Science). 30 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

Sample questions

1. Which of the following best describes the kinetic theory of gases?

   1. Gases are composed of tiny particles in constant, random motion.
   2. Gases are composed of large, stationary particles.
   3. Gases are composed of particles that only move when heated.
   4. Gases have no mass.
   Show answer

   Answer: A. Gases are composed of tiny particles in constant, random motion.

   The kinetic theory of gases is based on the idea that gases consist of many small particles that are constantly moving and colliding with each other and the walls of their container.

2. What is the relationship between the volume and pressure of a gas at constant temperature (Boyle's Law)?

   1. V ∝ P
   2. V ∝ 1/P
   3. V = P
   4. V is independent of P
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   Answer: B. V ∝ 1/P

   Boyle's law states that at constant temperature, the volume of a given mass of gas is inversely proportional to its pressure. As pressure increases, volume decreases.

3. If you decrease the temperature of a gas, what will happen to its average kinetic energy?

   1. It will increase.
   2. It will decrease.
   3. It will remain the same.
   4. It will become zero.
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   Answer: B. It will decrease.

   The average kinetic energy of a gas is directly proportional to its absolute temperature. Lowering the temperature lowers the average kinetic energy.

4. A balloon filled with helium is heated. What will happen to its volume?

   1. Decrease
   2. Stay the same
   3. Increase
   4. It depends on the shape of the balloon
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   Answer: C. Increase

   Heating the gas increases its kinetic energy and average speed of particles, leading to expansion and a larger volume (at constant pressure).

5. What is the average kinetic energy of gas molecules directly proportional to?

   1. Volume
   2. Pressure
   3. Temperature
   4. Number of moles
   Show answer

   Answer: C. Temperature

   The average kinetic energy is directly proportional to the absolute temperature of the gas.

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