HKDSE (Hong Kong) · Physics

Heat and Gases

18 practice questions, each with the answer and an explanation.

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Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.

All 18 questions

  1. How much energy is needed to raise the temperature of 4 kg of water by 10 °C? (Specific heat capacity of water = 4200 J/kg °C)
  2. How much energy is needed to raise the temperature of 0.5 kg of water by 40 °C? (Specific heat capacity of water = 4200 J/kg °C)
  3. How much energy is needed to raise the temperature of 0.5 kg of water by 20 °C? (Specific heat capacity of water = 4200 J/kg °C)
  4. How much energy is needed to raise the temperature of 0.5 kg of water by 60 °C? (Specific heat capacity of water = 4200 J/kg °C)
  5. How much energy is needed to raise the temperature of 3 kg of water by 10 °C? (Specific heat capacity of water = 4200 J/kg °C)
  6. The specific latent heat of fusion of ice is 336 000 J/kg. How much energy is needed to melt 2 kg of ice at 0 °C?
  7. The specific latent heat of fusion of ice is 336 000 J/kg. How much energy is needed to melt 0.2 kg of ice at 0 °C?
  8. The specific latent heat of fusion of ice is 336 000 J/kg. How much energy is needed to melt 0.5 kg of ice at 0 °C?
  9. A fixed mass of gas at constant temperature has volume 12 cm at 300 kPa. The volume is reduced to 4 cm. What is the new pressure?
  10. A fixed mass of gas at constant temperature has volume 6 cm at 200 kPa. The volume is reduced to 2 cm. What is the new pressure?
  11. A fixed mass of gas at constant temperature has volume 12 cm at 100 kPa. The volume is reduced to 4 cm. What is the new pressure?
  12. A fixed mass of gas at constant temperature has volume 20 cm at 400 kPa. The volume is reduced to 5 cm. What is the new pressure?
  13. A sealed rigid container holds gas at 127 °C and 200 kPa. The gas is heated to 327 °C. What is the new pressure?
  14. A sealed rigid container holds gas at 27 °C and 200 kPa. The gas is heated to 327 °C. What is the new pressure?
  15. A sealed rigid container holds gas at 127 °C and 100 kPa. The gas is heated to 327 °C. What is the new pressure?
  16. A sealed rigid container holds gas at 127 °C and 200 kPa. The gas is heated to 227 °C. What is the new pressure?
  17. Which change takes place when a gas in a sealed container is heated at constant volume?
  18. On a day when the air temperature is 30 °C, why does a metal spoon feel colder than a wooden spoon at the same temperature?

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