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9th Standard Science - Heat Model Question Paper Sep-25 , 2019

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9th Standard Science - Heat Model Question Paper

Heat Model Question Paper

9th Standard

    Reg.No. :
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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 in

    (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

  6. During day time, air blows from________________to_____________

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    sea to land

  7. ___________is a process just reverse of melting

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    Freezing

  8. __________ is the degree of hotness or coldness of a body.

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    Temperature

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

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    Expansion

  10. 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.

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    convection currents

    11. 5 x 1 = 5

  11. Heat

    12. (1)

    4.2 J/g0C

  12. m x s x t

    13. (2)

    336 J/g

  13. Boiling point of water

    14. (3)

    1 millennium

  14. Latent heat of fusion of ice

    15. (4)

    Form of energy

  15. Specific heat capacity of water

    16. (5)

    Heat gained or lost when there is no change of state
    4 x 2 = 8

  16. 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)

  17. Define latent heat of fusion?

  18. Define one calorie.

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

    20. 4 x 3 = 12

  20. Define conduction.

  21. Differentiate convection and radiation

  22. Define thermal capacity.

    23. 3 x 5 = 15

  23. Explain convection in daily life.

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

  25. Give the difference between heat and temperature.

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