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9th Science - Heat Model Question Paper

Heat Model Question Paper

9th Standard

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Science

Time : 01:00:00 Hrs
Total Marks : 50
    5 x 1 = 5

  1. The amount of heat required to raise the temperature through 10C is called_________

    (a)

    thermal energy

    (b)

    calorie

    (c)

    heat capacity

    (d)

    specific heat capacity

  2. The temperature at which a liquid gets converted into its vapour state is called its________

    (a)

    melting point

    (b)

    boiling point

    (c)

    dew point

    (d)

    freezing point

  3. Ice does not melt rapidly because of

    (a)

    high specific heat capacity

    (b)

    high latent of fusion

    (c)

    high heat capacity

    (d)

    high latent heat of fusion

  4. Which one of the following scales has lower fixed point at 0°C?

    (a)

    Kelvin scale

    (b)

    Fahrenheit scale

    (c)

    Celsius scale

    (d)

    All of these

  5. On a cold day, it is hard to open the lid of a tight container. But when you gently heat the neck you can easily open the lid. why?

    (a)

    On heating Glass expands and lid contracts

    (b)

    On heating lid expands more than the neck and thus slides easily

    (c)

    Neck becomes slippery on heating

    (d)

    Lid of the bottle cannot bear the heat.

    6. 5 x 2 = 10

  6. Heat gained by a body depends upon which factors?

  7. What is the other name of heat capacity?

  8. Define one calorie.

  9. Which factor determines the direction of flow of heat from one body to another?

  10. What is the minimum possible temperature? Is there also a maximum possible temperature?

    11. 5 x 3 = 15

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

  12. 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.

  13. 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

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

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

    16. 4 x 5 = 20

  16. Explain convection in daily life.

  17. How can you experimentally prove that water is a bad conductor of heat? How is it possible to heat water easily while cooking.

  18. Give some practical applications of specific latent heat of ice.

  19. Convert the following:
    (1) 1000F to 0C
    (2) 400C to Fahrenheit (0F)
    (3) 350C to Kelvin
    (4) 800K to 0C

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