Lesson 5.1.2

5.1.2 Solid, liquid and gas Quiz: OCR Physics, Unit 4

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 5.1.2, Solid, liquid and gas: 20 multiple choice questions for the OCR Physics (H156), Unit 4: Newtonian world and astrophysics, written with Revision Ninja.

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The 20 questions

  1. According to the kinetic model, how are gas molecules arranged and moving?

    • Far apart randomly
    • Vibrating in place
    • Tightly packed randomly
    • Close in grid

  2. What model describes matter as small particles in continuous random motion?

    • Wave model
    • Atomic model
    • Continuous model
    • Kinetic model

  3. What key idea does Brownian motion provide direct experimental evidence for?

    • Nuclear decay
    • Random molecular motion
    • Gravitational attraction
    • Electrostatic repulsion

  4. In a smoke cell, why do smoke particles display random motion?

    • Air molecule collisions
    • Thermal convection currents
    • Light radiation pressure
    • Electrostatic repulsion

  5. Internal energy is defined as the sum of random potential energy and which other energy?

    • Translational momentum
    • Macroscopic kinetic energy
    • Random kinetic energy
    • Gravitational potential energy

  6. When the temperature of a body rises, its internal energy:

    • becomes zero
    • increases
    • stays the same
    • decreases

  7. What happens to internal energy as a substance melts at constant temperature?

    • Stays constant
    • Decreases
    • Drops to zero
    • Increases

  8. Which type of motion do atoms exhibit in a solid lattice?

    • Rotational
    • Stationary
    • Vibrating
    • Translational

  9. How do particles move relative to each other in a liquid?

    • Remain static
    • Slide past
    • Move freely
    • Vibrate fixed

  10. What is assumed about forces between ideal gas molecules between collisions?

    • Strongly attractive
    • Negligible
    • Infinitely large
    • Strongly repulsive

  11. How are particles arranged in a liquid compared to a solid?

    • Disordered far
    • Ordered close
    • Ordered far
    • Disordered close

  12. What change causes the Brownian motion of smoke particles to become more vigorous?

    • Decreasing air pressure
    • Decreasing air temperature
    • Increasing air temperature
    • Increasing smoke mass

  13. Why do gases have a much lower density than solids?

    • Lower average speed
    • Smaller molecular radius
    • Large molecular spacing
    • Smaller atomic mass

  14. Absolute temperature is directly proportional to which molecular property?

    • Maximum potential energy
    • Total internal energy
    • Mean kinetic energy
    • Total potential energy

  15. Which molecules are most likely to escape a liquid during evaporation?

    • Highest kinetic energy
    • Lowest kinetic energy
    • Highest potential energy
    • Lowest potential energy

  16. Why does rapid compression of a gas cause its temperature to rise?

    • Molecules gain kinetic energy
    • Potential energy decreases
    • Volume increases
    • Molecules lose mass

  17. What causes molecules in a gas to have a distribution of speeds?

    • Equal masses
    • Uniform forces
    • Fixed temperatures
    • Random collisions

  18. Why are gases much more compressible than liquids?

    • Smaller particle mass
    • Large molecular spacing
    • Lower absolute temperature
    • Weaker individual molecules

  19. During a change of phase at constant temperature, energy supplied increases which quantity?

    • Molecular potential energy
    • Molecular kinetic energy
    • Substance temperature
    • Average particle speed

  20. What causes the pressure exerted by a gas on container walls?

    • Molecular collisions
    • Gravitational pull
    • Thermal expansion
    • Intermolecular repulsion

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