Physics Important Questions Class 12 UP Board

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    Physics Important Questions Class 12 UP Board. We covered all the Physics Important Questions Class 12 UP Board in this post for free so that you can practice well for the exam.

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    Physics Important mcqs Class 12 UP Board for Students

    When a Light ray passes from a denser medium into a rarer medium, after refraction it

    a) bends towards the normal

    b) bends away from the normal

    c) continues straight without deviation

    d) depends on the nature of the denser medium

    Option b – bends away from the normal

    In a given medium, different colours of Light propagate with

    a) identical speeds

    b) different speeds

    c) steadily decreasing speeds

    d) steadily increasing speeds

    Option b – different speeds

    The Sun appears of its actual size when observed at noon mainly due to

    a) reflection of light by the Atmosphere

    b) normal incidence of sunlight through the Atmosphere, resulting in zero refraction angle

    c) polarization of light

    d) Diffraction of light

    Option b – normal incidence of sunlight through the Atmosphere, resulting in zero refraction angle

    When light travels from a rarer medium into a denser medium, the width of the wavefront

    a) decreases

    b) increases

    c) remains unchanged

    d) may either increase or decrease

    Option b – increases

    The ratio of the refractive index of orange light to that of green light in air is

    a) less than 1

    b) greater than 1

    c) equal to 1

    d) infinite

    Option a – less than 1

    The ratio of the refractive index of orange light to that of green light in glass is

    a) less than 1

    b) greater than 1

    c) equal to 1

    d) infinite

    Option a – less than 1

    For a transparent quartz crystal, the refractive index is maximum for

    a) green light

    b) yellow light

    c) red light

    d) violet light

    Option d – violet light

    Even in perfectly clear water, objects ahead are not seen sharply by a car driver mainly because

    a) light rays undergo scattering in water

    b) the focal length of the eye lens changes in water

    c) the reduced speed of light in water alters the ray path

    d) all of the above

    Option c – the reduced speed of light in water alters the ray path

    We covered all the Physics important Questions Class 12 UP Board above in this post for free so that you can practice well for the exam.

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