Light Important Questions

9th Standard

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Science

Time : 01:00:00 Hrs
Total Marks : 50
    5 x 1 = 5
  1. The field of view * is maximum for ________ 

    (a)

    plane mirror

    (b)

    concave mirror

    (c)

    convex mirror

  2. _________ is used as reflectors in torchligh

    (a)

    concave mirror

    (b)

    convex mirror

    (c)

    plane mirror

  3. When a beam of white light passes through a prism it gets

    (a)

    Reflected

    (b)

    deviated and dispersed

    (c)

    only deviated

  4. A real and enlarged image can be obtained by using a

    (a)

    convex mirror

    (b)

    plane mirror

    (c)

    concave mirror

  5. Mirrors having spherical surface of reflection are __________________

    (a)

    plane mirror

    (b)

    lenses

    (c)

    spherical mirrors

    (d)

    prism

  6. 5 x 1 = 5
  7. In going from a rarer to denser medium, the ray of light bends _________

    ()

      towards the normal

  8. The mirror used in search light is ________ .

    ()

      Concave

  9. The radius of curvature of a concave mirror whose focal length is 5cm is  ________

    ()

      

  10. A negative sign in the value of magnification indicates that the image is________

    ()

      real

  11. Light travels in the form of _____________________________

    ()

    electro magnetic waves

  12. 4 x 1 = 4
  13. The angle of deviation depends on the refractive index of the glass

    (a) True
    (b) False
  14. If the object is at infinity in front of a convex mirror the image is formed at infinity.

    (a) True
    (b) False
  15. The reason for brilliance of diamonds is mainly due to total internal reflection of light.

    (a) True
    (b) False
  16. Optical fibres are extensively used for transmitting audio and video signals through short distance.

    (a) True
    (b) False
  17. 5 x 1 = 5
  18. Ratio of height of image to height of object.

  19. (1)

    Surgery

  20. Mirage

  21. (2)

    concave mirror

  22. At focus F

  23. (3)

    At F - Highly Diminished, Real, inverted

  24. At infinity

  25. (4)

    convex mirror

  26. Optical fibres

  27. (5)

    Infinity - Highly Magnified, Real, inverted

    2 x 2 = 4
  28. Assertion: For observing the traffic at a hairpin bend in mountain paths a plane mirror is preferred over convex mirror and concave mirror.
    Reason: A convex mirror has a much larger field of view than a plane mirror or a concave mirror.

  29. Assertion: A ray of light from an object successively bends away from the normal and undergo total internal reflection.
    Reason: If the angle of reflection for the air near the ground reduces the critical angle.

  30. 7 x 2 = 14
  31. Give two examples of transparent medium that are denser than air

  32. Name the mirror(s) that can give (i) an erect and enlarged image, (ii) same sized, inverted image

  33. Copy this figure in your answer book and show the direction of the light ray after reflection

  34. What is speed of light in vacuum? Who first measured the speed of light?

  35. What is a concave mirror?

  36. What is convex mirror?

  37. What is real image?

  38. 1 x 3 = 3
  39. Write the spherical mirror formula and explain the meaning of each symbol used in it.

  40. 2 x 5 = 10
  41. Find the size, nature and position of image formed when an object of size 1 cm is placed at a distance of 15 cm from a concave mirror of focal length 10 cm.

  42. State and verify laws of refraction using a glass slab

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