6.3.2.2 Temperature changes in a system and specific heat capacity Quiz: AQA Combined Science, Unit 20

The 20 questions

1. What is the equation for change in thermal energy?

   • half mv squared
   • mc delta-theta
   • mL
   • mgh

2. What is the unit of specific heat capacity?

   • kg/J degrees C
   • J/degrees C
   • J/kg
   • J/kg degrees C

3. What is the unit for specific heat capacity?

   • J/kg °C
   • J/kg
   • W/kg °C
   • J/°C

4. Which quantity is NOT needed to calculate thermal energy change?

   • Mass
   • Specific heat capacity
   • Volume
   • Temperature change

5. What does the symbol delta-theta represent?

   • Temperature change
   • Latent heat
   • Thermal energy
   • Specific heat capacity

6. In which unit is change in thermal energy measured?

   • Kelvin
   • Watt
   • Newton
   • Joule

7. If mass doubles at constant specific heat capacity, what happens to energy change?

   • It stays constant
   • It quadruples
   • It doubles
   • It halves

8. When can the equation change in thermal energy = mc delta-theta be used?

   • During freezing
   • During boiling
   • During melting
   • Within one state

9. How much energy is needed to heat 0.5 kg of water (c = 4200 J/kg degrees C) by 20 degrees C?

   • 8400 J
   • 42 000 J
   • 4200 J
   • 420 000 J

10. How much energy heats 2 kg of aluminium (c = 900 J/kg degrees C) by 10 degrees C?

    • 1800 J
    • 18 000 J
    • 9000 J
    • 180 000 J

11. A 3 kg block receives 27 000 J and warms by 15 degrees C. What is its specific heat capacity?

    • 6000 J/kg degrees C
    • 300 J/kg degrees C
    • 600 J/kg degrees C
    • 1200 J/kg degrees C

12. A 0.2 kg metal with c = 400 J/kg degrees C receives 8000 J. What is its temperature rise?

    • 100 degrees C
    • 40 degrees C
    • 20 degrees C
    • 200 degrees C

13. Which substances warm up faster when given identical energy?

    • Lower specific heat capacity
    • Denser materials
    • Larger mass substances
    • Higher specific heat capacity

14. A 1.5 kg oil sample warms by 40 degrees C when it receives 60 000 J. What is its specific heat capacity?

    • 1000 J/kg degrees C
    • 100 J/kg degrees C
    • 400 J/kg degrees C
    • 2000 J/kg degrees C

15. How much energy is needed to heat 2 kg of water (c = 4200 J/kg degrees C) from 15 degrees C to 35 degrees C?

    • 84 000 J
    • 42 000 J
    • 336 000 J
    • 168 000 J

16. Is c = 4200 J/kg degrees Celsius consistent with heating 0.25 kg by 40 degrees C using 42 000 J?

    • Insufficient data
    • No, too high
    • No, too low
    • Yes, it matches

17. Why does water require a lot of energy per kilogram to warm up?

    • High thermal conductivity
    • Low specific heat capacity
    • High specific heat capacity
    • Low density

18. A 0.4 kg liquid receives 3360 J to rise from 20 degrees C to 45 degrees C. What is its specific heat capacity?

    • 84 J/kg degrees C
    • 8400 J/kg degrees C
    • 3360 J/kg degrees C
    • 336 J/kg degrees C

19. A 1 kg block with c = 500 J/kg degrees C receives 200 W for 120 s with no energy lost. What is its temperature rise?

    • 48 degrees C
    • 0.48 degrees C
    • 96 degrees C
    • 24 degrees C

20. A 2 kg block with c = 400 J/kg degrees C cools by 10 degrees C. What is its change in thermal energy?

    • -800 J
    • 8000 J
    • -80 000 J
    • -8000 J

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