Physics

10th

grade

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CBSE PHYSICS

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20 questions

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  • 1. Multiple Choice
    1 minute
    1 pt

    The bluish colour of water in deep sea is due to:

    The presence of algae and other plants found in water

    Reflection of the sky in water

    Scattering of light

    Absorption of light by the sea

  • 2. Multiple Choice
    1 minute
    1 pt

    The layer of atmosphere whose temperature is less than that of hotter layer behaves as an optically

    Denser medium

    Rarer medium

    Inactive medium

    Either denser or rarer medium

  • 3. Multiple Choice
    1 minute
    1 pt

    A 10 mm long awl pin is placed vertically in front of a concave mirror. A 5 mm long image of the awl pin is formed at 30 cm in front of the mirror. The focal length of this mirror is

    30 cm

    20 cm

    40cm

    60 cm

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