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    Subject
    Physics

    Class

    ICSE Class 12

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    ISC Class 12 Physics Solved Question Paper 2008

    Multiple Choice QuestionsShort Answer Type

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    11. What will be the effect, if any, on the fringe width in Young’s double slit experiment if red light is used in place of violet light ?

    Fringe width is given by —

    straight B space equals space λD over straight d

    Triangle width is directly proportional to the wavelength of light used.

    So,

    λred > λvoilet

    Therefore, 


    straight beta subscript red space greater than thin space straight beta subscript violet
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    12. How will you identify experimentally whether a given beam of light is plane polarised or unpolarised ?
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    13. An intensity of illumination of 5 lux is required at a distance of 10 m from an electric lamp. What must be the luminous intensity of the lamp ?
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    14. What is the main reason for axial chromatic aberration in the formation of images by a lens ?
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    15. What is the angle of refraction made by a ray of light inside a regular i.e., an equilateral glass prism in the minimum deviation case ?
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    16. Photo electric threshold frequency of an alkali metal is 5.0 x 1014 Hz. Calculate the work function of this metal.
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    17. What conclusion can be drawn from G.P. Thomson’s experiment ?
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    18.

    Half life of a certain radioactive substance is 13.86 days. What is the value of its disintegration constant?

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    19. What is the source of energy of stars ?
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    20.

    Identify the logic gate whose truth table is given below and draw its logic symbol.


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