The Human Eye and the Colourful World MCQ Quiz

30 questions

1. The eye focuses light onto the

   1. cornea
   2. retina
   3. iris
   4. pupil

2. The ability of the eye lens to change focal length is

   1. reflection
   2. accommodation
   3. refraction
   4. dispersion

3. The part controlling the amount of light entering the eye is the

   1. retina
   2. iris/pupil
   3. cornea
   4. lens

4. The least distance of distinct vision for a normal eye is

   1. 10 cm
   2. 25 cm
   3. 50 cm
   4. 1 m

5. The far point of a normal eye is at

   1. 25 cm
   2. 1 m
   3. 10 m
   4. infinity

6. Myopia is

   1. short-sightedness
   2. long-sightedness
   3. old-age vision
   4. colour blindness

7. Myopia is corrected using a

   1. convex lens
   2. concave lens
   3. cylindrical lens
   4. bifocal lens

8. In myopia, the image forms

   1. on the retina
   2. in front of the retina
   3. behind the retina
   4. on the cornea

9. Hypermetropia is

   1. short-sightedness
   2. far-sightedness
   3. astigmatism
   4. presbyopia

10. Hypermetropia is corrected using a

    1. concave lens
    2. convex lens
    3. prism
    4. plane glass

11. In hypermetropia, the image forms

    1. on the retina
    2. in front of the retina
    3. behind the retina
    4. on the iris

12. Presbyopia is corrected using

    1. concave lens
    2. convex lens
    3. bifocal lens
    4. prism

13. Splitting of white light into its colours is

    1. reflection
    2. dispersion
    3. refraction
    4. scattering

14. The sequence of colours in a spectrum is

    1. VIBGYOR
    2. ROYGBIV order given as
    3. both correct
    4. white

15. In a prism, the colour that bends the most is

    1. red
    2. violet
    3. yellow
    4. green

16. In a prism, the colour that bends the least is

    1. violet
    2. red
    3. blue
    4. green

17. Twinkling of stars is due to

    1. dispersion
    2. atmospheric refraction
    3. reflection
    4. scattering

18. The blue colour of the clear sky is due to

    1. reflection
    2. scattering of light
    3. dispersion
    4. absorption

19. The phenomenon of scattering of light by colloidal particles is the

    1. Doppler effect
    2. Tyndall effect
    3. Raman effect
    4. photoelectric effect

20. The muscles that change the curvature of the eye lens are

    1. iris
    2. ciliary muscles
    3. retina
    4. cornea

21. Assertion: The sky appears blue. Reason: Blue light of shorter wavelength is scattered more than red.

    1. Both true, R explains A
    2. Both true, R not explanation
    3. A true, R false
    4. A false, R true

22. Light-sensitive cells of the retina are

    1. rods and cones
    2. ciliary cells
    3. iris cells
    4. corneal cells

23. Cone cells are sensitive to

    1. dim light
    2. bright light and colour
    3. UV only
    4. sound

24. The most refraction of light entering the eye occurs at the

    1. lens
    2. cornea
    3. retina
    4. pupil

25. A person needing a −2 D lens suffers from

    1. hypermetropia
    2. myopia
    3. presbyopia
    4. astigmatism

26. A person needing a +2 D lens suffers from

    1. myopia
    2. hypermetropia
    3. colour blindness
    4. cataract

27. Danger signals are red because red light

    1. scatters least/travels farthest
    2. scatters most
    3. disperses most
    4. reflects least

28. White light passing through a prism without dispersion happens when

    1. one prism used
    2. two identical inverted prisms used
    3. glass is thick
    4. angle is large

29. Refractive index of the eye lens is adjusted by changing its

    1. position
    2. curvature
    3. colour
    4. size of pupil

30. Cloudy/milky eye lens in old age is

    1. myopia
    2. cataract
    3. hypermetropia
    4. astigmatism

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