Term 2 Heat Three Marks Questions

9th Standard

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Science

Time : 00:45:00 Hrs
Total Marks : 30
    10 x 3 = 30
  1. How does the water kept in an earthen pot remain cool?

  2. Define specific latent heat capacity

  3. What could be the final temperature of a mixture of 100 g of water at 90ºC and 600g of water at 20ºC.

  4. Why are burns caused by steam more painful than those caused by boiling water at the same temperature?

  5. What is the amount of heat required to raise the temperature of 5 kg of iron from 30°C to 130°C? Specific heat capacity of iron = 483 Jkg-1C-1.

  6. Calculate the amount of heat required to convert 200g of ice at 00C into water at 00C Specific latent heat of fusion of ice = 336 Jg-1

  7. 2875 J of heat is required to melt 115 g of lead at its melting point. Calculate the specific latent heat capacity of fusion of lead.

  8. What will be the final temperature it 1,68,000 J of heat is absorbed by 2 kg of water at 30°C?

  9. A metal ball of heat capacity 50J/0C loses 2000 J of heat. By how much will its temperature fall?

  10. How much boiling water at 100ºC is needed to melt 2kg of ice so that the mixture which is all water is at 0ºC?

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