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  1. Hot water is poured simultaneously in four metallic tumblers painted outside with different points. After some time the water will be found to have cooled most in the tumbler painted.

  2. A.

     Rough white

    B.

     Rough black

    C.

     Shining white

    D.

     Shining black

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  3. Which of the following criterion is used for any metal to be used as a cooking material ?

  4. A.

     More specific heat

    B.

     More thermal conductivity

    C.

     Less thermal conductivity

    D.

     Less electrical conductivity

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  5. Heat from the sun reaches earth by the process of

  6. A.

     Conduction

    B.

     Convection

    C.

     Radiation

    D.

     All of the above

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  7. Ocean currents are an example of

  8. A.

     Convection

    B.

     Conduction

    C.

     Insulation

    D.

     Radiation

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  9. What type of heat transfer is boiling water?

  10. A.

     Radiation

    B.

     Conduction

    C.

     Convection

    D.

     None of the above

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  11. Ventilators are provided near the ceiling of the room because

  12. A.

     The exhaled warmer air rises up and goes out

    B.

     These provide cross ventilation in the room

    C.

     These provide some sunlight in the room

    D.

     These do not look nice in the lower part

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  13. Wollen clothes keep the body warm because

  14. A.

     Wool increases the temperature of the body

    B.

     Wool is a bad conductor

    C.

     Wool absorbs radiant heat from outer objects

    D.

     Wool rejects heat from the outer objects

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  15. Plants are dried up in winter due to frost because

  16. A.

     Evaporation does not take place

    B.

     Photosynthesis does not take place at such low temperature

    C.

     Respiration does not take place at low temperature

    D.

     There is mechanical loss of tissues and drought condition prevails

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  17. A cup of hot coffee is placed on a metal table in a room. By which of the following methods does it lose heat?

  18. A.

     Conduction and convection only

    B.

     Conduction and radiation only

    C.

     Convection and radiation only

    D.

     Conduction, convection and radiation

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  19. In general, which is the cause of a land breeze?

  20. A.

     Pressure

    B.

     Heat

    C.

     Temperature

    D.

     None of the above

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