Mathematics, Science

5th -

10thgrade

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CRT 8 (CBSE BOARD)

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15 questions

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  • 1. Fill in the Blank
    1 minute
    1 pt

    Refractive index of diamond with respect to glass is 1.6 and the absolute refractive index of glass is 1.5. Find out the absolute refractive index of diamond.

  • 2. Multiple Choice
    3 minutes
    1 pt

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

    – 15 cm

    – 30 cm

    – 45 cm

    – 60 cm

  • 3. Multiple Choice
    2 minutes
    1 pt

    Rays from Sun converge at a point 25 cm in front of a concave mirror. Where should an object be placed so that size of its image is equal to the size of the object?

    25 cm in front of the mirror

    50 cm in front of the mirror

    between 25 cm and 50 cm in front of the mirror

    more than 50 cm in front of the mirror

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