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Heat Model Question Paper

8th Standard EM

    Reg.No. :
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Science

Time : 00:45:00 Hrs
Total Marks : 30
    3 x 1 = 3
  1. Heat is a form of ________.

    (a)

    electrical energy

    (b)

    gravitational energy

    (c)

    thermal energy

    (d)

    None of these

  2. If you apply equal amount of heat to a solid, liquid and gas individually, which of the following will have more expansion?

    (a)

    Solid

    (b)

    Liquid

    (c)

    Gas

    (d)

    All of them

  3. Conduction is the heat transfer which takes place in a____________.

    (a)

    solid

    (b)

    liquid

    (c)

    gas

    (d)

    All of them

  4. 4 x 1 = 4
  5. A calorimeter is a device used to measure the________.

    ()

      

  6. _______ is defined as the amount of heat required to raise the temperature of 1kg of a substance by 1°C.

    ()

       

  7. The process of converting a substance from gas to solid is called_________.

    ()

      

  8. If the temperature of a liquid in a container is decreased, then the interatomic distance will ___________.

    ()

      

  9. 4 x 1 = 4
  10. The applied heat energy can be realized as an increase in the average kinetic energy of the molecules.

    (a) True
    (b) False
  11. The process of converting a substance from solid to gas is called condensation.

    (a) True
    (b) False
  12. Convection is the process by which the thermal energy flows in solids.

    (a) True
    (b) False
  13. In a thermos flask, the silvered walls reflect and radiate the heat to the outside.

    (a) True
    (b) False
  14. 4 x 2 = 8
  15. What are the effects of heat?

  16. Name three types of heat transfer

  17. Write a note on convection.

  18. Define one calorie

  19. 2 x 3 = 6
  20. Write a note on thermostat.

  21. Explain the working of thermos flask.

  22. 1 x 5 = 5
  23. Why does the bottom of a lake not freeze in severe winter even when the surface is all frozen?

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