Optics 1 Mark Creative Question Paper With Answer Key

10th Standard

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Science

Time : 00:20:00 Hrs
Total Marks : 15

     Multiple Choice Question

    15 x 1 = 15
  1. The path of light is ______

    (a)

    rays

    (b)

    point

    (c)

    lines

    (d)

    beam

  2. The group of rays is ______

    (a)

    lines

    (b)

    dots

    (c)

    beam

    (d)

    none of these

  3. The velocity of light is _______

    (a)

    3 x 10-8 ms-1

    (b)

    3 x 108  ms-1

    (c)

    3 x 108 km s-1

    (d)

    3 x 10-8 km s-1

  4. Velocity and wavelength of light are related by a relation

    (a)

    g-c⋋

    (b)

    \(\gamma =\frac { c }{ \lambda } \)

    (c)

    c=\(\gamma \)

    (d)

    both b & c

  5. Violet and red light ______ wavelengths.

    (a)

    lowest, highest

    (b)

    highest, lowest

    (c)

    same

    (d)

    standard

  6. We can see objects because of

    (a)

    reflection

    (b)

    refraction

    (c)

    transmission

    (d)

    diffraction

  7. _____ determines speed of light in a medium.

    (a)

    thickness

    (b)

    wavelength

    (c)

    refractive index

    (d)

    both b and c

  8. When light travels from rarer to denser medium, the refracted ray is ______  the normal.

    (a)

    bent away

    (b)

    along

    (c)

    bent towards

    (d)

    just grazes the surface of separation

  9. For air, the refractive index is

    (a)

    1

    (b)

    infinity

    (c)

    0

    (d)

    1

  10. When a ray of light travels from one medium to another, it bends. This phenomenon is called.

    (a)

    reflection

    (b)

    dispersion

    (c)

    refraction

    (d)

    interference

  11. The splitting up of white light into colours is called

    (a)

    reflection

    (b)

    refraction

    (c)

    scattering

    (d)

    dispersion

  12. On a rainy day, small oily films on water show brilliant colours. This is due to

    (a)

    scattering

    (b)

    dispersion

    (c)

    reflection

    (d)

    refraction

  13. Rainbow formation is due to _____ water droplets.

    (a)

    Ionisation

    (b)

    absorption of sunlight

    (c)

    reflection and refraction of sunlight

    (d)

    reflection of sunlight

  14. Red light is used in traffic signals because

    (a)

    It has highest wavelength

    (b)

    disperses least

    (c)

    red is symbol of danger

    (d)

    both a & b

  15. A star appears twinkling in the sky because of ______ by the atmosphere.

    (a)

    scattering of light

    (b)

    reflection of light

    (c)

    refraction of light

    (d)

    both a and b

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