# MCQ Question for Class 10 Science Chapter 11 Human Eye and Colourful World with Answer

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## MCQ Question for Class 10 Science Chapter 11 Human Eye and Colourful World with Answer

1. The muscular diaphragm that controls the size of the pupil is
(a) cornea
(b) ciliary muscles
(c) iris
(d) retina

2. Having two eyes facilitates in
A : Increasing the field of view
B : Bringing three-dimensional view
C : Developing the concept of distance/ size
Then the correct option is/are
(a) A only
(b) A and B only
(c) B only
(d) A, B and C

3. The black opening between the aqueous humour and the lens is called
(a) retina
(b) iris
(c) cornea
(d) pupil

4. Near and far points of a young person normal eye respectively are
(a) 0 and infinity
(b) 0 and 25 cm
(c) 25 cm and infinity
(d) 25 cm and 150 cm.

5. The defect of vision in which the person is able to see distant object distinctly but cannot see nearby objects clearly is called
(a) Long-sightedness
(b) Far-sightedness
(c) Hypermetropia
(d) All above

Human Eye And Colourful World Class 10 MCQ Question 6. The ability of eye lens to adjust its focal length to form a sharp image of the object at varying distances on the retina is called
(a) Power of observation of the eye
(b) Power of adjustment of the eye
(c) Power of accommodation of the eye
(d) Power of enabling of the eye

7. Myopia and hypermetropia can be corrected by
(a) Concave and plano-convex lens
(b) Concave and convex lens
(c) Convex and concave lens
(d) Plano-concave lens for both defects.

8. Bi-focal lens are required to correct
(a) astigmatism
(b) coma
(c) myopia
(d) presbyopia

9. The defective eye of a person has near point 0.5 m and point 3 m. The power far corrective lens required for
(i) reading purpose and
(ii) seeing distant objects, respectively are:
(a) 0.5 D and +3D
(b) +2D and – $$\frac{1}{3}$$ D
(c) – 2D and + $$\frac{1}{3}$$D
(d) 0.5 D and-3.0 D

10. The image formed on the retina of the human eye is
(a) virtual and inverted
(b) real and inverted
(c) real and erect
(d) virtual and erect

11. When white light enters a prism, it gets split into its constituent colours. This is due to
(a) different refractive index for different wavelength of each colour
(b) each colours has same velocity in the prism.
(c) prism material have high density.
(d) Scattering of light

12. The air layer of atmosphere whose temperature is less then the hot layer behave as optically
(a) denser medium
(b) rarer medium
(c) inactive medium
(d) either denser or rarer medium

13. Refraction of light by the earth’s atmosphere due to variation in air density is called
(a) atmospheric reflection
(b) atmospheric dispersion
(c) atmospheric scattering
(d) atmospheric refraction

14. The deflection of light by minute particles and molecules of the atmosphere in all direction is called ____________ of light.
(a) dispersion
(b) scattering
(c) interference
(d) tyndell effect

15. One cannot see through the fog, because
(a) refractive index of the fog is very high
(b) light suffers total reflection at droplets
(c) fog absorbs light
(d) light is scattered by the droplets

16. A person cannot see distinctly objects kept beyond 2 m. This defect can be corrected by using a lens of power [NCERT Exemplar Problems]
(a) + 0.5 D
(b) – 0.5 D
(c) + 0.2 D
(d) – 0.2 D

17. A prism ABC (with BC as base) is placed in different orientations. A narrow beam of white light is incident on the prism as shown in figure. In which of the following cases, after dispersion, the third colour from the top corresponds to the colour of the sky? [NCERT Exemplar Problems]

18. At noon the sun appears white as [NCERT Exemplar Problems]
(a) light is least scattered
(b) all the colours of the white light are scattered away
(c) blue colour is scattered the most
(d) red colour is scattered the most

19. Twinkling of stars is due to atmospheric [NCERT Exemplar Problems]
(a) dispersion of light by water droplets
(b) refraction of light by different layers of varying refractive indices
(c) scattering of light by dust particles
(d) internal reflection of light by clouds.

20. The clear sky appears blue because [NCERT Exemplar Problems]
(a) blue light gets absorbed in the atmosphere.
(b) ultraviolet radiations are absorbed in the atmosphere.
(c) violet and blue lights get scattered more than lights of all other colours by the atmosphere.
(d) light of all other colours is scattered more than the violet and blue colour lights by the atmosphere.

MCQ On Human Eye With Answers Pdf Question 21. The danger signals installed at the top of tall buildings are red in colour. These can be easily seen from a distance because among all other colours, the red light [NCERT Exemplar Problems]
(a) is scattered the most by smoke or fog
(b) is scattered the least by smoke or fog
(b) is absorbed the most by smoke or fog
(c) moves fastest in air

22. The bluish colour of water in deep sea is due to [NCERT Exemplar Problems]
(a) the presence of algae and other plants found in water
(b) reflection of sky in water
(c) scattering of light
(d) absorption of light by the sea

23. When light rays enter the eye, most of the refraction occurs at the [NCERT Exemplar Problems]
(a) crystalline lens
(b) outer surface of the cornea
(c) iris
(d) pupil

24. The focal length of the eye lens increases when eye muscles [NCERT Exemplar Problems]
(a) are relaxed and lens becomes thinner
(b) contract and lens becomes thicker
(c) are relaxed and lens becomes thicker
(d) contract and lens becomes thinner

Multiple Choice Questions And Answers On Human Eye Question (Q25 to Q30): In the following Questions, the Assertion and Reason have been put forward. Read the statements carefully and choose the correct alternative from the following:
(a) Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion.
(b) The Assertion and the Reason are correct but the Reason is not the correct explanation of the Assertion.
(c) Assertion is true but the Reason is false.
(d) The statement of the Assertion is false but the Reason is true.
25. Assertion: Blind spot is a small area of the retina which is insensitive to light where the optic nerve leaves the eye.
Reason: There are no rods or cones present at the junction of optic nerve and retina in the eye.

26. Assertion: The near-point of a hypermetropic eye is more than 25 cm away.
Reason: Hypermetropia is corrected using spectacles containing concave lenses.

27. Assertion: Myopia is the defect of vision in which a person cannot see the distant objects clearly.
Reason: This due to eye-ball being too short.

28. Assertion: Concave mirrors are used as reflectors in torches, vehicle head-lights and in search lights.
Reason: When an object is placed beyond the centre of curvature of a concave mirror, the image formed is real and inverted.

Human Eye And Colourful World MCQ Question 29. Assertion: The light emerges from a parallel-sided glass slab in a direction perpendicular with that in which enters the glass slab.
Reason: The perpendicular distance between the original path of incident ray and emergent ray coming out of glass slab is called lateral displacement of the emergent ray of light.

30. Assertion: When a pencil is partly immersed in water and held obliquely to the surface, the pencil appears to bend at the water surface.
Reason: The apparent bending of the pencil is due to the refraction of light when it passes from water to air.

31. The least distance of distinct vision for a nor¬mal eye is
(a) infinity
(b) 25 cm
(c) 2.5 cm
(d) 25 m

32. A person cannot see distinctly objects kept beyond 2 m. This defect can be corrected by using a lens of power
(a) +0.5 D
(b) -0.5 D
(c) +0.2 D
(d) -0.2 D

MCQs On Human Eye And Colourful World Question 33. The defect of vision in which a person cannot see the distant objects clearly but can see nearby objects clearly is called
(a) myopia
(b) hypermetropia
(c) presbyopia
(d) bifocal eye

34. The splitting of white light into different colours on passing through a prism is called
(a) reflection
(b) refraction
(c) dispersion
(d) deviation

35. At noon, the Sun appears white as
(a) blue colour is scattered the most
(b) red colour is scattered the most
(c) light is least scattered
(d) all the colours of the white light are scattered away

36. Twinkling of stars is due to
(a) reflection of light by clouds
(b) scattering of light by dust particles
(c) dispersion of light by water drops
(d) atmospheric refraction of starlight

37. When white light enters a glass prism from air, the angle of deviation is least for
(a) blue light
(b) yellow light
(c) violet light
(d) red light

38. When white light enters a glass prism from air, the angle of deviation is maximum for
(a) blue light
(b) yellow light
(c) red light
(d) violet light

MCQ Questions On Human Eye And Colourful World Pdf 39. The amount of light entering the eye can be controlled by the
(a) iris
(b) pupil
(c) cornea
(d) ciliary muscles

40. What type of image is formed by the eye lens on the retina?
(a) Real and erect
(b) Virtual and inverted
(c) Real and inverted
(d) Virtual and erect

41. The medical condition in which the lens of the eye of a person becomes progressively cloudy resulting in blurred vision is called
(a) myopia
(b) hypermetropia
(c) presbyopia
(d) cataract

42. The defect of the eye in which the eyeball becomes too long is
(a) myopia
(b) hypermetropia
(c) presbyopia
(d) cataract

43. The defect of vision in which the image of nearby objects is formed behind the retina, is
(a) myopia
(b) short-sightedness
(c) hypermetropia
(d) presbyopia

44. Which of the following is a natural phenomenon which is caused by the dispersion of sunlight in the sky?
(a) Twinkling of stars
(b) Stars seem higher than they actually are
(c) Advanced sunrise and delayed sunset
(d) Rainbow

Objectives Questions On Human Eye And The Colourful World 45.
Name the scientist who was the first to use a glass prism to obtain the spectrum of sunlight.
(a) Isaac Newton
(b) Einstein
(c) Kepler
(d) Hans Christian Oersted

46. Very fine particles scatter more of ____________ colour.

Human Eye Class 10 MCQ Question 47.
Red light is used for signals as it is ____________ scattered.

48. Bi-focal lens is used to correct ____________ refractive error.

49. Hypermetropic eye is corrected by using ____________ lens.

50. When light falls at critical angle on the surface of a rarer medium while coming from a denser medium, the refracting angle is ____________ .

51. The dispersion of white light occurs because colours of white light at different ____________ through the glass prism.

52. 28 frames are projected per second in motion picture. [True/False]

53. Myopia is caused due to excessive curvature in cornea. [True/False]

54. A lens of higher focal length has less power. [True/False]

55. Power of accommodation for a normal eye is 4 dioptre. [True/False]

56. The optical nerves carry signals to the brain. [True/False]

57. Match Column I with Column II.

(i) → (D)
(ii) → (C)
(iii) → (A)
(iv) → (B)

58. In a human eye, name the following parts:
(a) a thin membrane which allows light to enter the eye.
(b) the muscles which help in changing the focal length of eye lens.

(a) Cornea
(b) Ciliary muscles

59. Name the part of our eyes that helps us to focus near and distant objects in quick succession.

Answer: Ciliary muscles help in changing the focal length of the eye lens.

60. In which direction, the near point of hypermetropic eye is shifted from the normal near point?

Answer: The near point of hypermetropic eye is shifted farther away from the normal near point.

61. Name the part responsible for the power of accommodation of the human eye.
Or
Name the component of eye that is responsible for the adjustment of eye lens? [DoE]

62. A person suffering from an eye defect uses lenses of power ID. Name the defect he is suffering from and the nature of lens used.

Answer: Hypermetropia; convex lens.

63. What is the nature of eye lens of human eye and that of the image formed at the retina of the eye by it?

Answer: The nature of eye lens in human eye is convex nature of the image formed on the retina by it is real, inverted and diminished.

64. Mention the role of optic nerve in the human eye.

Answer: Role of optic nerve in human eye: It transmits the visual information in the form of electrical signal generated at retina to the brain.

65. What is the other name of old hypermetropia?

Fill in the Blanks

1. The ability of the eye to focus both near and distant objects, by adjusting its focal length, is called the ……….. of the eye.
2. ……….. of light causes the blue colour of sky and reddening of the Sun at sunrise and sunset.
3. Most of the refraction of light rays entering the eye occurs at the outer surface of the ……….. .
4. Due to the greater converging power of the eye lens in a myopic eye, the image of distant object is formed ……….. the retina.
5. A person suffering from both myopia and hypermetropia uses ……….. leases.