Free daily NEET & JEE PYQs, quizzes & mock tests on TelegramJoin free →

NEET Physics: the concept of pressure Practice Questions

15 free multiple-choice questions on the concept of pressure (Kinetic Theory of Gases) for NEET Physics, each with the correct answer and a step-by-step explanation. Attempt a question, then reveal the solution to check your reasoning.

Practice thousands more NEET questions in the app →

  1. Q1. If the absolute temperature of a gas is increased while its volume remains constant, the pressure inside the container will:

    • Abecome zero
    • Bincrease
    • Cremain unchanged
    • Ddecrease
    Show answer & explanation

    Correct answer: B — increase

    According to the Ideal Gas Law (PV=nRT), if V and n are constant, pressure (P) is directly proportional to temperature (T). Hence, increasing T increases P.

  2. Q2. For an ideal gas contained in a fixed volume, if the absolute temperature of the gas is doubled, what happens to the pressure exerted by the gas?

    • AThe pressure remains the same.
    • BThe pressure is doubled.
    • CThe pressure is halved.
    • DThe pressure is quadrupled.
    Show answer & explanation

    Correct answer: B — The pressure is doubled.

    According to the ideal gas law (PV=nRT), for a fixed volume (V) and fixed amount of gas (n), pressure (P) is directly proportional to the absolute temperature (T). Therefore, doubling the temperature doubles the pressure.

  3. Q3. For two rigid containers, A and B, each containing the same amount of gas at the same temperature, the pressure inside them will be:

    • Athe same
    • Bunequal
    • Cdifferent
    • Dzero
    Show answer & explanation

    Correct answer: A — the same

    Since the temperature and the amount of gas (moles) are the same, the kinetic energy and thus the resulting pressure exerted by the gas in both containers will be equal.

  4. Q4. In the context of Kinetic Theory of Gases, pressure is fundamentally defined as:

    • AThe average force exerted by a single molecule
    • BThe rate of change of momentum of the gas
    • CThe force exerted by the gas on its surroundings
    • DThe total kinetic energy of all molecules
    Show answer & explanation

    Correct answer: C — The force exerted by the gas on its surroundings

    Pressure is the force exerted per unit area. Microscopically, it arises from the momentum transferred during molecular collisions with the walls.

  5. Q5. What is the fundamental origin of the pressure exerted by an ideal gas on the walls of the container?

    • AThe random motion of molecules
    • BThe potential energy stored in the gas
    • CThe net force exerted by the walls
    • DThe gravitational pull on the molecules
    Show answer & explanation

    Correct answer: A — The random motion of molecules

    Pressure arises from the continuous bombardment of the container walls by the molecules, which results from their random motion and the transfer of momentum during collisions.

  6. Q6. Pressure exerted by an ideal gas is directly proportional to which of the following physical properties of the gas molecules?

    • AThe average momentum change per collision
    • BThe internal energy of the gas
    • CThe density of the gas
    • DThe potential energy of the molecules
    Show answer & explanation

    Correct answer: A — The average momentum change per collision

    The pressure exerted is proportional to the momentum change of the molecules during collisions, which is directly related to their velocity and momentum transfer.

  7. Q7. Which of the following scenarios will result in a decrease in the pressure exerted by a gas, assuming the temperature remains constant?

    • AIncreasing the force applied to the walls.
    • BDecreasing the number of molecules.
    • CIncreasing the volume.
    • DDecreasing the molecular velocity.
    Show answer & explanation

    Correct answer: C — Increasing the volume.

    For a fixed amount of gas at constant temperature, pressure is inversely proportional to volume (P ∝ 1/V). Therefore, increasing the volume while keeping T constant will decrease the pressure.

  8. Q8. Which statement correctly describes the origin of pressure exerted by an ideal gas on the walls of the container?

    • AThe net force exerted by the gas molecules on the container walls.
    • BThe average potential energy of the gas molecules.
    • CThe change in momentum during molecular collisions with the walls.
    • DThe total kinetic energy of the gas molecules.
    Show answer & explanation

    Correct answer: C — The change in momentum during molecular collisions with the walls.

    Pressure arises from the continuous bombardment of the container walls by gas molecules. Each collision results in a change in momentum, and the net effect of these momentum changes over time is the macroscopic pressure exerted by the gas.

  9. Q9. If the volume of a fixed mass of an ideal gas is doubled at constant temperature, what happens to the pressure?

    • APressure is halved
    • BPressure remains the same
    • CPressure is doubled
    • DPressure is quadrupled
    Show answer & explanation

    Correct answer: A — Pressure is halved

    According to the ideal gas law (PV=nRT), if temperature (T) and the amount of gas (n) are constant, doubling the volume (V) must result in doubling the pressure (P).

  10. Q10. The pressure exerted by a gas is related to the rate of change of momentum. If the speed of the gas molecules is significantly increased, how does this affect the magnitude of the pressure?

    • APressure is inversely proportional to velocity
    • BPressure is independent of velocity
    • CPressure decreases
    • DPressure increases
    Show answer & explanation

    Correct answer: D — Pressure increases

    Since pressure depends on the momentum transferred per unit time (related to m v Δv), an increase in molecular speed leads to a greater rate of momentum transfer and thus an increase in pressure.

  11. Q11. Which of the following statements best defines the pressure exerted by a gas on the walls of its container?

    • AThe total intermolecular force between gas molecules.
    • BThe total kinetic energy of the molecules divided by the volume.
    • CThe potential energy stored in the gas molecules.
    • DThe force exerted by the gas per unit area on the walls.
    Show answer & explanation

    Correct answer: D — The force exerted by the gas per unit area on the walls.

    Pressure is defined as the force exerted by the gas divided by the area over which the force is distributed. It is the force per unit area exerted by the gas molecules colliding with the container walls.

  12. Q12. Which property of the gas molecules is primarily responsible for the pressure exerted by the gas on the walls of the container?

    • Athe momentum transferred during collisions
    • Bthe potential energy of the molecules
    • Cthe mass of the molecules
    • Dthe random motion of the molecules
    Show answer & explanation

    Correct answer: A — the momentum transferred during collisions

    Pressure arises from the continuous bombardment of the walls by the molecules. This impact results in momentum transfer, which manifests as macroscopic pressure.

  13. Q13. For a fixed amount of gas at constant temperature, if the volume of the container is doubled, the pressure inside the container will:

    • Aremain the same
    • Bbe halved
    • Cbe quadrupled
    • Dbe doubled
    Show answer & explanation

    Correct answer: B — be halved

    According to Boyle's law (at constant T and n), Pressure is inversely proportional to Volume (P ∝ 1/V). Doubling the volume halves the pressure.

  14. Q14. Pressure exerted by a gas on the walls of a container is due to:

    • Acollisions of gas molecules with the walls
    • Bpotential energy of the gas
    • Cgravitational force on the walls
    • Dnet force acting on the walls
    Show answer & explanation

    Correct answer: A — collisions of gas molecules with the walls

    Pressure in gases arises from the continuous, random collisions of the gas molecules with the inner walls of the container.

  15. Q15. In the kinetic theory of gases, the pressure exerted by the gas is primarily due to:

    • AThe force exerted by gas molecules colliding with the walls of the container
    • BThe internal energy of the gas
    • CThe potential energy stored in the gas molecules
    • DThe net momentum of the gas molecules
    Show answer & explanation

    Correct answer: A — The force exerted by gas molecules colliding with the walls of the container

    Pressure in gases arises from the continuous bombardment and collisions of the gas molecules with the walls of the container.

Keep going — practice on Padhai Karlo

Padhai Karlo gives you unlimited NEET practice: chapter-wise questions, timed quizzes, and full mock tests with an All-India Rank — free to start.

Get the free Android app →

More Kinetic Theory of Gases topics

← All Kinetic Theory of Gases practice