Light English Medium Free Online Test 1 Mark Questions 2020-2021

9th Standard

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Science

Time : 00:20:00 Hrs
Total Marks : 20

    Part A

    10 x 1 = 10
  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. The focal length of a concave mirror is 5cm. Its radius of curvature is

    (a)

    5 cm

    (b)

    10 cm

    (c)

    2.5 cm

  4. The speed of light is maximum in

    (a)

    vacuum

    (b)

    glass

    (c)

    diamond

  5. Which of the following statements about total internal reflection is true?

    (a)

    angle of incidence should be greater than critical angle

    (b)

    light must travel from a medium of higher refractive index to a medium of lower refractive index

    (c)

    both (a) and (b)

  6. Mirrors having spherical surface of reflection are __________________

    (a)

    plane mirror

    (b)

    lenses

    (c)

    spherical mirrors

    (d)

    prism

  7. The mirror that diverge the light rays is______________________

    (a)

    concave

    (b)

    convex

    (c)

    plane

    (d)

    None of these

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

    (a)

    centre of curvafure

    (b)

    focus

    (c)

    pole

    (d)

    radius of curvature

  9. The radius of curvature of the spherical mirror is equal to __________________

    (a)

    focal length

    (b)

    twice the focal length

    (c)

    thrice the focal length ,:

    (d)

    half of the focal length

  10. To form a real image -________________mirror is required.

    (a)

    parallel

    (b)

    plane

    (c)

    convex

    (d)

    concave

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