Lesson 6.3.3.1

6.3.3.1 Particle motion in gases Quiz: AQA Combined Science, Unit 20

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 6.3.3.1, Particle motion in gases: 20 multiple choice questions for the AQA GCSE Combined Science (8464), Unit 20: Particle model of matter, written with Revision Ninja.

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The 20 questions

  1. What kind of motion do the molecules of a gas have?

    • Constant random motion.
    • Circular orbits only.
    • A regular lattice.
    • Fixed positions.

  2. The temperature of a gas is directly related to which property of its molecules?

    • Total potential energy
    • Total volume
    • Average mass
    • Average kinetic energy

  3. If the temperature of a fixed-volume gas rises, what happens to its pressure?

    • Decreases
    • Increases
    • Stays constant
    • Drops to zero

  4. What directly causes the pressure exerted by a confined gas?

    • Particle-particle bonding
    • Magnetic attraction
    • Particle wall collisions
    • Gravitational pull

  5. In the temperature-pressure relation for a gas, which quantity is kept constant?

    • Pressure
    • Volume
    • Number of collisions
    • Temperature

  6. What happens to gas molecules when the temperature of the gas increases?

    • Mass increases
    • Kinetic energy increases
    • Volume decreases
    • Density increases

  7. Why is a sealed aerosol can dangerous when left in a hot car?

    • Volume increases
    • Pressure increases
    • Mass increases
    • Gravity increases

  8. Which term describes the motion of gas molecules in a container?

    • Circular
    • Stationary
    • Fixed
    • Random

  9. If a gas sample speeds up, which property changes?

    • Atomic number
    • Chemical formula
    • Kinetic energy
    • Mass

  10. A gas at constant volume is cooled. What happens to its pressure?

    • Doubles
    • Increases
    • Decreases
    • Stays constant

  11. When a gas is heated at constant volume, how do particle collisions change?

    • More frequent and forceful
    • More frequent and weaker
    • Less frequent and stronger
    • Less frequent and forceful

  12. Why does a gas expand to fill its entire container?

    • Strong attraction
    • Fixed positions
    • High density
    • Random motion

  13. Between two sealed containers of the same gas at the same volume, the hotter one has what?

    • Higher pressure.
    • Lower mass.
    • The same pressure.
    • Lower pressure.

  14. What shape is a pressure-temperature graph for a fixed-volume gas?

    • Straight line
    • Horizontal line
    • U-shaped curve
    • S-shaped wave

  15. Why does water boil at a lower temperature at high altitudes?

    • Lower gravity
    • Lower pressure
    • Higher pressure
    • Higher density

  16. When a gas at constant volume is heated, what rises first?

    • Volume
    • Mass
    • Density
    • Temperature

  17. What does the temperature of a gas relate directly to?

    • Particle volume
    • Average kinetic energy
    • Particle mass
    • Total potential energy

  18. Which quantity stays unchanged when gas molecules speed up inside a fixed container?

    • Rate of collisions
    • Volume
    • Temperature
    • Pressure

  19. If a gas molecule's speed is halved, what happens to its kinetic energy?

    • Halved
    • Quartered
    • Unchanged
    • Doubled

  20. What motion do gas molecules exhibit in a sealed container?

    • Uniform circular motion
    • Ordered linear flow
    • Stationary vibration
    • Constant random motion

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