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General Knowledge :: Physics

  1. What is refractive index ?

  2. A.

     It is defined as the ratio of speed of light in the medium to the speed of light in vacuum.

    B.

     It is defined as the product of speed of light in medium and in vacuum.

    C.

     It is defined as the ratio of speed of light in vacuum to the speed of light in the medium.

    D.

     None of above


  3. A star appears twinkling in the sky because of

  4. A.

     Scattering of light by atmosphere

    B.

     Reflection of light by atmosphere

    C.

     Refraction of light by atmosphere

    D.

     Diffraction of light by atmosphere


  5. What type of lens is used in a magnifying glass

  6. A.

     Concave

    B.

     Plano-concave

    C.

     Convex

    D.

     None of the above


  7. Time of exposure required for taking photograph of an object depends upon the

  8. A.

     Brightness of the object

    B.

     Skill of photographer

    C.

     Proximity of object

    D.

     Size of the object


  9. A concave lens always forms

  10. A.

     A real image

    B.

     A virtual image

    C.

     An image type which depends on object characteristics

    D.

     An image type which depends on lens curvature


  11. A concave lens always forms an image which is

  12. A.

     Real and erect

    B.

     Virtual and erect

    C.

     Real and inverted

    D.

     Virtual and inverted


  13. Which one of the following determines the sharpness of image in a camera ?

  14. A.

     The aperture

    B.

     The exposure time

    C.

     The focal length of the lens

    D.

     Size of the camera


  15. Dioptre is the unit of

  16. A.

     Power of a lens

    B.

     Focal length of a lens

    C.

     Light intensity

    D.

     Sound intensity


  17. The part of the eye having the largest refractive index is :

  18. A.

     Cornea

    B.

     Aqueous humor

    C.

     Lens

    D.

     Vitreous humor


  19. Vehicles use ________ to see the objects coming from behind.

  20. A.

     Concave lens

    B.

     Convex lens

    C.

     Convex mirror

    D.

     Concave mirror