Optics One Mark

10th Standard EM

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Science

Time : 00:45:00 Hrs
Total Marks : 30
    10 x 1 = 10
  1. The refractive index of four substances A, B, C and D are 1.31, 1.43, 1.33, 2.4 respectively. The speed of light is maximum in

    (a)

    A

    (b)

    B

    (c)

    C

    (d)

    D

  2. In a myopic eye, the image of the object is formed

    (a)

    behind the retina

    (b)

    on the retina

    (c)

    in front of the retina

    (d)

    on the blind spot

  3. The eye defect ‘presbyopia’ can be corrected by

    (a)

    convex lens

    (b)

    concave lens

    (c)

    convex mirror

    (d)

    Bi focal lenses

  4. If VB, VG, VR be the velocity of blue, green and red light respectively in a glass prism, then which of the following statement gives the correct relation?

    (a)

    VB = VG = VR

    (b)

    VB > VG >VR

    (c)

    VB < VG < VR

    (d)

    VB < VG > VR

  5. The path of light is ______

    (a)

    rays

    (b)

    point

    (c)

    lines

    (d)

    beam

  6. The group of rays is ______

    (a)

    lines

    (b)

    dots

    (c)

    beam

    (d)

    none ofthese

  7. The velocity of light is _______

    (a)

    3x 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

  8. 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

  9. If the energy of the incident and scattered beam of light are same, then it is called ______ scattering

    (a)

    Ray light

    (b)

    Inelastic

    (c)

    Mie

    (d)

    Elastic

  10. The scattering of light by colloidal particles is _____  scattering.

    (a)

    Ray light

    (b)

    Mie

    (c)

    Raman

    (d)

    Tyndall

  11. 10 x 1 = 10
  12. The refractive index of a transparent medium is always greater than__________

    ()

    one

  13. If the energy of incident beam and the scattered beam are same, then the scattering of light is called as________scattering.

    ()

    elastic

  14. Amount of light entering into the eye is controlled by________

    ()

    Iris

  15. Blue and green light has different _____ and ______

    ()

    wavelength, frequency

  16. Refraction is due to difference in _____ of light in different media.

    ()

    velocity

  17. Angle of refraction is _____ for red and _____ for violet.

    ()

    smallest, highest

  18. 1D is equal to _______

    ()

    1 m-1

  19. ______ tough membrane protects the internal parts of the eye.

    ()

    sclera

  20. Ciliary muscles help to change _____ of the eye lens according to the position of the object.

    ()

    focal length

  21. The focal length of the eye lens is adjusted by ______

    ()

    ciliary muscles

  22. 10 x 1 = 10
  23. Ciliary muscles

  24. (1)

    Reflection

  25. Hypermetropia

  26. (2)

    near point moves away

  27. Object which give out light

  28. (3)

    highest frequency

  29. Object which emit their own light

  30. (4)

    Dispersion

  31. violet light

  32. (5)

    Luminous

  33. red light

  34. (6)

    Scattering of light

  35. Deviation of ray

  36. (7)

    source

  37. Objects can be seen

  38. (8)

    Refraction

  39. Splitting up of colours

  40. (9)

    highest wavelength

  41. Blue colour of the sea

  42. (10)

    Power accommodation

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