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  1. Heat from the Sun reaches the Earth by

    2. A.

     Reflection
    B.

     Conduction
    C.

     Radiation
    D.

     Convection

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  2. Heat transfer by conduction occurs when molecules

    3. A.

     Collide
    B.

     Combine
    C.

     Heated
    D.

     None of the above

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  3. A body absorbs heat most if it is

    4. A.

     Black and rough
    B.

     Black and smooth
    C.

     White and rough
    D.

     White and smooth

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  4. A black body can absorb radiations of :

    5. A.

     Lower wavelengths only
    B.

     Intermediate wavelengths only
    C.

     Higher wavelengths only
    D.

     All wavelengths

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  5. The cover of a solar cooker is made of glass because

    6. A.

     It absorbs sun's rays
    B.

     It reflects sun's rays
    C.

     It retains the heat inside by the green house effect
    D.

     It rediates heat better than metals

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  6. The base of an electric iron is brightly polished mainly

    7. A.

     To make it smooth and frictionless
    B.

     To make it rust-proof
    C.

     To reduce heat loss by radiation
    D.

     To make it more durable

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  7. A stone floor feels cold to the bare feet but a carpet on the same floor feels warm. This is because

    8. A.

     The floor and carpet are at different temperatures
    B.

     The stone conveys the heat away from the feet more rapidly than the carpet
    C.

     The carpet is a better conductor of heat than the stone
    D.

     The human body maintains a constant temperature

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  8. Global warming is expected to result in

    9. A.

     Increase in level of sea
    B.

     Change in crop pattern
    C.

     Change in coast line
    D.

     All of the above

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  9. Why two thin shirts can keep us warmer than a single thick shirt in winter ?

    10. A.

     Two thin shirts become thicker so prevent transmission of heat
    B.

     Air layer between two shirts works as good conductor
    C.

     Air layer between two shirts behaves like insulating media
    D.

     No radiation of heat takes place

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  10. Sun's heat reaches us by

    11. A.

     Conduction
    B.

     Convection
    C.

     Radiation
    D.

     Reflection

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