Heat Model Question Paper

9th Standard

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Science

Time : 01:30:00 Hrs
Total Marks : 50
    5 x 1 = 5
  1. Calorie is the unit of

    (a)

    heat

    (b)

    work

    (c)

    temperature

    (d)

    food

  2. The specific heat capacity of water is

    (a)

    4200 Jkg-1K-1

    (b)

    420 Jg-1K-1

    (c)

    0.42 Jg-1K-1

    (d)

    4.2 Jkg-1K-1

  3. A device in which the loss of heat due to conduction, convection and radiation is minimized is

    (a)

    Solar cell

    (b)

    Solar cooker

    (c)

    Thermometer

    (d)

    Thermos flask

  4. 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

  5. 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

  6. 5 x 1 = 5
  7. During day time, air blows from________________to_____________

    ()

    sea to land

  8. ___________is a process just reverse of melting

    ()

    Freezing

  9. _____________is the degree of hotness or coldness ofa body.

    ()

    Temperature

  10. ______________is greater for liquids than for solids and maximum in case of gases.

    ()

    Expansion

  11. Black marks appearing on the ceiling above a lamp or fan caused by dust being carried upwards in air __________ produced by hot lamp or the running fan.

    ()

    convection currents

  12. 5 x 1 = 5
  13. Heat

  14. (1)

    1 millennium

  15. m x s x t

  16. (2)

    Form of energy

  17. Boiling point of water

  18. (3)

    Heat gained or lost when there is no change of state

  19. Latent heat of fusion of ice

  20. (4)

    4.2 J/g0C

  21. Specific heat capacity of water

  22. (5)

    336 J/g

    4 x 2 = 8
  23. What is the heat in joules required to raise the temperature of 25 grams of water from 0ºC to 100ºC? What is the heat in Calories?
    (Specific heat of water = 4.18 J/gºC)

  24. Define latent heat of fusion?

  25. Define one calorie.

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

  27. 4 x 3 = 12
  28. Define conduction

  29. Differentiate convection and radiation

  30. Define thermal capacity.

  31. How much heat energy is required to melt 5 kg of ice? (Specic latent heat of ice = 336 Jg-1)

  32. 3 x 5 = 15
  33. Explain convection in daily life.

  34. What are the changes of state in water? Explain.

  35. Give the difference between heat and temperature.

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