NCERT Book Class 10th SCIENCE MCQ
Chapter 10 : Human Eye and Colourful World
Multiple-Choice Questions (MCQs) with Answers
1. Light-sensitive cells in the human eye are found in:
a) Cornea
b) Retina
c) Iris
d) Pupil
Answer: b) Retina
2. The amount of light entering the eye is controlled by the:
a) Lens
b) Pupil
c) Ciliary muscles
d) Retina
Answer: b) Pupil
3. The lens of the human eye is:
a) Convex lens
b) Concave lens
c) Plano-concave lens
d) Bifocal lens
Answer: a) Convex lens
4. The muscles that adjust the focal length of the eye lens are:
a) Iris
b) Ciliary muscles
c) Cells of the retina
d) Cornea
Answer: b) Ciliary muscles
5. The image of an object in the eye is formed on the:
a) Cornea
b) Retina
c) Iris
d) Lens
Answer: b) Retina
6. The nature of the image formed on the retina is:
a) Virtual and erect
b) Real and inverted
c) Virtual and inverted
d) Real and erect
Answer: b) Real and inverted
7. The range of accommodation of the human eye is:
a) 10 cm to 20 cm
b) 25 cm to infinity
c) 2.5 cm to 25 cm
d) 25 cm to 50 cm
Answer: b) 25 cm to infinity
8. The minimum distance for clear vision for a normal eye is:
a) 25 cm
b) 50 cm
c) 10 cm
d) 100 cm
Answer: a) 25 cm
9. In myopiathe image is formed:
a) Behind the retina
b) Exactly on the retina
c) In front of the retina
d) On the lens
Answer: c) In front of the retina
10. The lens used to correct myopia is:
a) Convex lens
b) Concave lens
c) Bifocal lens
d) Plano-convex lens
Answer: b) Concave lens
11. In hypermetropiathe image is formed:
a) Behind the retina
b) Exactly on the retina
c) In front of the retina
d) On the cornea
Answer: a) Behind the retina
12. The lens used to correct hypermetropia is:
a) Concave lens
b) Convex lens
c) Cylindrical lens
d) Plane lens
Answer: b) Convex lens
13. Presbyopia is related to:
a) Reduced flexibility of the lens
b) Clouding of the cornea
c) Damage to the retina
d) Constriction of the pupil
Answer: a) Reduced flexibility of the lens
14. Astigmatism is caused by:
a) Irregular curvature of the cornea
b) Cloudiness of the lens
c) Damage to the retina
d) Expansion of the pupil
Answer: a) Irregular curvature of the cornea
15. Which defect makes it difficult to see both near and far objects clearly?
a) Myopia
b) Hypermetropia
c) Presbyopia
d) Astigmatism
Answer: c) Presbyopia
16. The sky appears blue due to:
a) Reflection of light
b) Scattering of light
c) Refraction of light
d) Diffraction of light
Answer: b) Scattering of light
17. The Sun appears red during sunrise and sunset because:
a) Red light undergoes the least scattering
b) Blue light undergoes the maximum scattering
c) Presence of dust particles in the atmosphere
d) Sun’s rays travel obliquely
Answer: a) Red light undergoes the least scattering
18. Tyndall effect is related to:
a) Scattering of light
b) Reflection of light
c) Refraction of light
d) Diffraction of light
Answer: a) Scattering of light
19. Atmospheric scattering of light causes:
a) The sky to appear blue
b) The Sun to appear red during sunrise
c) Formation of a rainbow
d) All of the above
Answer: d) All of the above
20. Rainbow formation is caused by:
a) Reflection of light
b) Refraction and scattering of light
c) Diffraction of light
d) Polarization of light
Answer: b) Refraction and scattering of light
21. Dispersion of white light is achieved by using:
a) Lens
b) Mirror
c) Prism
d) Spherical mirror
Answer: c) Prism
22. In the spectrum obtained by dispersion of white light, the most deviated color is:
a) Red
b) Yellow
c) Blue
d) Violet
Answer: d) Violet
23. The spectrum of white light contains how many colors?
a) 5
b) 6
c) 7
d) 8
Answer: c) 7 (Violet, Indigo, Blue, Green, Yellow, Orange, Red)
24. In the dispersion of white light, the least deviated color is:
a) Red
b) Blue
c) Green
d) Yellow
Answer:a) Red
25. Which color is at the top of a rainbow?
a) Red
b) Blue
c) Green
d) Yellow
Answer: a) Red
26. Cataract is related to which part of the eye?
a) Cornea
b) Eye lens
c) Retina
d) Iris
Answer: b) Eye lens
27. Light-sensitive cells in the retina are:
a) Cones and rods
b) Only cones
c) Only rods
d) Neurons
Answer: a) Cones and rods
28. Cone cells are responsible for:
a) Color vision
b) Vision in dim light
c) Only black-and-white vision
d) Understanding light intensity
Answer: a) Color vision
29. Rod cells are responsible for:
a) Color vision
b) Vision in dim light
c) Vision for red light only
d) Determining the direction of light
Answer: b) Vision in dim light
30. Blindness occurs when the image of an object is not formed on which part of the eye?
a) Cornea
b) Retina
c) Pupil
d) Iris
Answer: b) Retina
31. The process of adjusting the focal length of the eye lens to see objects clearly is called:
a) Accommodation
b) Reflection
c) Refraction
d) Dispersion
Answer: a) Accommodation
32. Which part of the human eye provides the color to the eyes?
a) Cornea
b) Iris
c) Retina
d) Pupil
Answer: b) Iris
33. In eye donation, which part of the eye is donated?
a) Entire eye
b) Only cornea
c) Only retina
d) Eye lens
Answer: b) Only cornea
34. In sunlight, which color has the maximum wavelength?
a) Violet
b) Blue
c) Red
d) Green
Answer: c) Red
35. In sunlight, which color has the minimum wavelength?
a) Violet
b) Blue
c) Red
d) Yellow
Answer: a) Violet
36. If a person’s near point is 50 cm, what defect might they have?
a) Myopia
b) Hypermetropia
c) Presbyopia
d) Astigmatism
Answer: b) Hypermetropia
37. If a person’s far point is less than infinity, what defect might they have?
a) Myopia
b) Hypermetropia
c) Presbyopia
d) Astigmatism
Answer: a) Myopia
38. Although the image formed on the retina is inverted, objects appear upright because:
a) The brain inverts the image
b) The eye lens inverts the image
c) The cornea inverts the image
d) The retina inverts the image
Answer: a) The brain inverts the image
39. Which of the following is not a component of white light?
a) Red
b) Green
c) Pink
d) Blue
Answer: c) Pink
40. The phenomenon of dispersion of light was first demonstrated by:
a) Isaac Newton
b) Galileo
c) Einstein
d) Thomas Edison
Answer: a) Isaac Newton
41. The lens of the human eye functions like:
a) A convex lens
b) A concave lens
c) A plane mirror
d) A concave mirror
Answer: a) A convex lens
42. The image formed in the eye is:
a) Virtual, upright, and small
b) Real, inverted, and small
c) Virtual, inverted, and large
d) Real, upright, and large
Answer: b) Real, inverted, and small
43. Light first falls on which part of the eye?
a) Retina
b) Cornea
c) Lens
d) Iris
Answer: b) Cornea
44. Which muscles contract or relax to focus an object in the eye?
a) Iris
b) Ciliary muscles
c) Retinal cells
d) Pupil
Answer: b) Ciliary muscles
45. Which visual defect is associated with old age?
a) Myopia
b) Hypermetropia
c) Presbyopia
d) Astigmatism
Answer: c) Presbyopia
46. Which part controls the amount of light entering the eye?
a) Cornea
b) Pupil
c) Lens
d) Retina
Answer: b) Pupil
47. Decreasing the focal length of the eye lens helps in viewing:
a) Distant objects
b) Nearby objects
c) The lens becoming concave
d) The lens becoming flat
Answer: b) Nearby objects
48. What type of lens is used to correct myopia?
a) Convex lens
b) Concave lens
c) Cylindrical lens
d) None of these
Answer: b) Concave lens
49. Hypermetropia can be corrected by using:
a) Convex lens
b) Concave lens
c) Cylindrical lens
d) Plane mirror
Answer: a) Convex lens
50. The splitting of white light into its component colors is called:
a) Reflection
b) Refraction
c) Dispersion
d) Scattering
Answer: c) Dispersion
51. The band of colors obtained from dispersion is called:
a) Spectrum
b) Shadow
c) Diffraction pattern
d) Rainbow
Answer: a) Spectrum
52. The red end of the spectrum corresponds to:
a) Higher frequency and higher wavelength
b) Lower frequency and higher wavelength
c) Higher frequency and lower wavelength
d) Lower frequency and lower wavelength
Answer: b) Lower frequency and higher wavelength
53. The violet end of the spectrum corresponds to:
a) Higher frequency and higher wavelength
b) Lower frequency and higher wavelength
c) Higher frequency and lower wavelength
d) Lower frequency and lower wavelength
Answer: c) Higher frequency and lower wavelength
54. In dispersion, the angle of deviation is maximum for:
a) Red light
b) Violet light
c) Green light
d) Yellow light
Answer: b) Violet light
55. The phenomenon responsible for the twinkling of stars is:
a) Refraction of light
b) Scattering of light
c) Atmospheric refraction of light
d) Reflection of light
Answer: c) Atmospheric refraction of light
56. The reason for the advanced sunrise and delayed sunset is:
a) Scattering of light
b) Atmospheric refraction
c) Dispersion of light
d) Reflection of light
Answer: b) Atmospheric refraction
57. Which color deviates the least during dispersion through a prism?
a) Violet
b) Blue
c) Green
d) Red
Answer: d) Red
58. Which color deviates the most during dispersion through a prism?
a) Violet
b) Blue
c) Green
d) Red
Answer : a) Violet
59. The defect of vision in which a person cannot distinguish certain colors is called:
a) Myopia
b) Hypermetropia
c) Color blindness
d) Presbyopia
Answer: c) Color blindness
60. Which part of the eye focuses light rays on the retina?
a) Iris
b) Cornea
c) Lens
d) Pupil
Answer: c) Lens
61. The far point of a normal human eye is:
a) 25 cm
b) 50 cm
c) Infinity
d) 100 cm
Answer: c) Infinity
62. The near point of a normal human eye is:
a) 10 cm
b) 25 cm
c) 50 cm
d) 100 cm
Answer: b) 25 cm
63. What happens when light enters from air into glass?
a) It bends away from the normal
b) It bends towards the normal
c) It does not bend
d) It is reflected
Answer: b) It bends towards the normal
64. Which phenomenon of light is responsible for the blue color of the sky?
a) Dispersion
b) Scattering
c) Reflection
d) Refraction
Answer: b) Scattering
65. Which phenomenon causes the red color of the Sun at sunrise and sunset?
a) Dispersion
b) Reflection
c) Scattering
d) Refraction
Answer: c) Scattering
66. A person with myopia cannot see:
a) Distant objects clearly
b) Nearby objects clearly
c) Objects in dim light
d) Colors distinctly
Answer: a) Distant objects clearly
67. A person with hypermetropia cannot see:
a) Distant objects clearly
b) Nearby objects clearly
c) Objects in bright light
d) Colors distinctly
Answer: b) Nearby objects clearly
68. The twinkling of stars is due to:
a) Dispersion of light
b) Reflection of light
c) Scattering of light
d) Atmospheric refraction
Answer: d) Atmospheric refraction
69. The human eye can sense light in the wavelength range of approximately:
a) 200-400 nm
b) 400-700 nm
c) 700-900 nm
d) 900-1100 nm
Answer: b) 400-700 nm
70. Cataract is a condition that causes:
a) Myopia
b) Blindness
c) Blurred vision due to clouding of the eye lens
d) Loss of peripheral vision
Answer: c) Blurred vision due to clouding of the eye lens
71. The part of the human eye that controls the size of the pupil is:
a) Cornea
b) Retina
c) Iris
d) Lens
Answer: c) Iris
72. A person with presbyopia requires:
a) Concave lenses
b) Convex lenses
c) Bifocal lenses
d) Cylindrical lenses
Answer: c) Bifocal lenses
73. The power of a lens is measured in:
a) Meter
b) Diopter
c) Candela
d) Lux
Answer: b) Diopter
74. The ability of the eye lens to change its focal length is called:
a) Refraction
b) Accommodation
c) Dispersion
d) Scattering
Answer: b) Accommodation
75. Rainbow formation involves:
a) Refraction, reflection, and dispersion
b) Reflection and scattering
c) Dispersion and scattering
d) Scattering and diffraction
Answer: a) Refraction, reflection, and dispersion