Lesson 3.6.2.1

3.6.2.1 Thermal energy transfer Quiz: AQA Physics, Unit 6

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 3.6.2.1, Thermal energy transfer: 20 multiple choice questions for the AQA Physics (7408), Unit 6: Further mechanics and thermal physics (A-level only), written with Revision Ninja.

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The 20 questions

  1. What is internal energy the sum of for particles in a body?

    • Kinetic and thermal
    • Potential and chemical
    • Gravitational and kinetic
    • Kinetic and potential

  2. The energy needed to change the temperature of a substance is given by:

    • Q = m c delta theta
    • Q = m l delta theta
    • Q = m c / delta theta
    • Q = c delta theta / m

  3. The energy needed for a change of state is given by:

    • Q = m c
    • Q = m delta theta / l
    • Q = m l
    • Q = l / m

  4. Which process increases the internal energy of a system?

    • Freezing the system
    • System doing work
    • Cooling the system
    • Heating the system

  5. During a phase change at constant temperature, which particle energy store changes?

    • Kinetic energy
    • Potential energy
    • Thermal energy
    • Rotational energy

  6. Specific heat capacity is energy needed per unit mass to raise temperature by what amount?

    • 0 K
    • 100 K
    • 273 K
    • 1 K

  7. The SI unit of specific latent heat is:

    • J kg^-1
    • W kg^-1
    • J kg
    • J kg^-1 K^-1

  8. Water (c = 4200 J kg^-1 K^-1) of mass 2.0 kg is heated through 10 K. How much energy is needed?

    • 420 kJ
    • 8.4 kJ
    • 84 kJ
    • 42 kJ

  9. Ice of mass 0.50 kg melts with specific latent heat 3.3 x 10^5 J kg^-1. How much energy is needed?

    • 16.5 kJ
    • 165 kJ
    • 33 kJ
    • 660 kJ

  10. A 2.0 kW heater supplies energy to 2.0 kg of water (c = 4200 J kg^-1 K^-1) and raises its temperature by 10 K. Ignoring losses, how long does this take?

    • 420 s
    • 4.2 s
    • 42 s
    • 168 s

  11. A 0.20 kg aluminium block (c = 900 J kg^-1 K^-1) cools by 15 K. How much energy does it release?

    • 0.27 kJ
    • 27 kJ
    • 2.7 kJ
    • 13.5 kJ

  12. A 0.30 kg mass of water boils at 100 degrees Celsius, with specific latent heat of vaporisation 2.26 x 10^6 J kg^-1. How much energy is needed?

    • about 68 kJ
    • about 680 kJ
    • about 7.5 MJ
    • about 6.8 kJ

  13. Water flows at 0.50 kg per second and is heated from 15 degrees to 35 degrees Celsius. What power is needed?

    • 8.4 kW
    • 420 kW
    • 42 kW
    • 4.2 kW

  14. A 500 W heater supplies a substance at a constant rate for 200 s during melting. How much energy does it supply?

    • 400 kJ
    • 2.5 kJ
    • 100 kJ
    • 10 kJ

  15. A 0.20 kg mass of hot water at 80 degrees Celsius is mixed with 0.30 kg of cold water at 20 degrees Celsius. Ignoring heat losses, what is the final temperature?

    • 40 degrees Celsius
    • 44 degrees Celsius
    • 60 degrees Celsius
    • 50 degrees Celsius

  16. What feature appears on a temperature-time graph while a pure substance is melting?

    • Exponential curve
    • Horizontal plateau
    • Steep positive slope
    • Vertical line

  17. A 0.50 kg metal block at 90 degrees Celsius is dropped into 0.40 kg of water at 20 degrees Celsius. The final temperature is 30 degrees Celsius. What is the specific heat capacity of the metal?

    • 4200 J kg^-1 K^-1
    • 140 J kg^-1 K^-1
    • 560 J kg^-1 K^-1
    • 2240 J kg^-1 K^-1

  18. A 1.5 kW heater runs for 5 minutes, and all its energy heats water from 20 degrees to 100 degrees Celsius. What mass of water is heated?

    • about 1.3 kg
    • about 0.25 kg
    • about 0.5 kg
    • about 6.7 kg

  19. What quantity of energy is required to change the state of 1 kg of substance without temperature change?

    • Specific heat capacity
    • Specific latent heat
    • Work done
    • Internal energy

  20. During solidification at constant temperature, what happens to particle potential energy?

    • It drops to zero
    • It stays constant
    • It increases
    • It decreases

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