Light - One Mark Questions

9th Standard

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Science

Time : 00:30:00 Hrs
Total Marks : 20
    10 x 1 = 10
  1. The field of view * is maximum for ________ 

    (a)

    plane mirror

    (b)

    concave mirror

    (c)

    convex mirror

  2. When a ray of light passes from one medium to another medium, refraction takes place when angle of incidence is

    (a)

    0o

    (b)

    45o

    (c)

    90o

  3. _________ is used as reflectors in torchligh

    (a)

    concave mirror

    (b)

    convex mirror

    (c)

    plane mirror

  4. The focal length of a concave mirror is 5cm. Its radius of curvature is

    (a)

    5 cm

    (b)

    10 cm

    (c)

    2.5 cm

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

    (a)

    Reflected

    (b)

    deviated and dispersed

    (c)

    only deviated

  6. Mirrors having spherical surface of reflection are __________________

    (a)

    plane mirror

    (b)

    lenses

    (c)

    spherical mirrors

    (d)

    prism

  7. A spherical mirror which has reflecting curved inward surface is ____________________mirror

    (a)

    concave

    (b)

    convex

    (c)

    plano concave

    (d)

    plano convex

  8. The mirror that diverge the light rays is______________________

    (a)

    concave

    (b)

    convex

    (c)

    plane

    (d)

    None of these

  9. The centre of the sphere, of which a spherical mirror is a part is called ______________________

    (a)

    pole

    (b)

    radius of curvature

    (c)

    focus

    (d)

    centre of curvature

  10. The centre of the reflecting surface of a spherical mirror is _____________________

    (a)

    centre of curvafure

    (b)

    focus

    (c)

    pole

    (d)

    radius of curvature

  11. 5 x 1 = 5
  12. In going from a rarer to denser medium, the ray of light bends _________

    ()

      towards the normal

  13. The ratio of sine of the angle of incidence to the sine of  _________ is a constant

    ()

      Infraction

  14. The mirror used in search light is ________ .

    ()

      Concave

  15. Light travels in the form of _____________________________

    ()

    electro magnetic waves

  16. The branch of optics that treats light as rays is named ray optics or_________________________

    ()

    geometrical optics

  17. 5 x 1 = 5
  18. The angle of deviation depends on the refractive index of the glass

    (a) True
    (b) False
  19. If a ray of light passes obliquely from one medium to another, it does not suffer any deviation.

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

    (a) True
    (b) False
  21. Mirror equation is \(\frac { 1 }{ f } =\frac { 1 }{ u } -\frac { 1 }{ v } \)

    (a) True
    (b) False
  22. In sign conversion for spherical mirrors the object is always placed on the right side of the mirror.

    (a) True
    (b) False

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