Mcq - Human Eye 32401j

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THE HUMAN EYE AND THE COLOURFUL WORLD – MULTIPLE CHOICE QUESTIONS 1. For a young adult with normal vision, the least distinct vision is about. a. 10 cm b. 15 cm c. 25 cm d. 25 m 2. The human eye can focus objects at different distance by adjusting the focal length of the eye lens. This due to. a. Presbyopia c. Near-sightedness b. Accommodation d. Far-sightedness 3. Which of the following colours is least scattered by fog or smoke? a. Red b. Yellow c. Blue d. violet 4. The human eye forms the image of an object at its. a. Iris b. Cornea c. Pupil d. retina 5. The change in focal length of an eye lens is caused by the action of the. a. Iris c. Retina b. Pupil d. Ciliary muscles 6. The sunlight is predominantly a mixture of visible colours. a. 5 b. 6 c. 7 d. None of these 7. The effect of the glass prism is only to separate the seven colours of. a. White light c. Light from a bulb b. Sun light d. All the above 8. The colour is at the top and colour is at the bottom of the spectrum. a. Red, violet c. Violet, red b. Red, blue d. None of these 9. Who discovered by his experiments with glass prisms that white light consists of seven prisms? a. Newton c. Maxwell b. Faraday d. young 10. Which of the following figures correctly, represent the age of white light through a prism?

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Q’ W

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o y

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Prism Prism

Glass slab Prism

a. Growth of membrane c. Cloudy image b. Milky image d. Weakening of ciliary muscles 51. A person cannot see distinctly any object placed beyond 40 cm from his eye. The power of the lens required to correct the problem is. a. -0.5 dioptre c. 0.5 dioptre b. -2.5 dioptre d. 0.025 dioptre 52. Ships are floating in space in cold places. This phenomenon is called. a. Mirage c. Looming b. Refraction d. Dispersion 53. The photographic film equivalent of our eye is. a. Iris c. Retina b. Pupil d. Ciliary muscle 54. Bi-focal lens are required to correct. a. Astigmatism c. Myopia b. Coma d. Presbyopia 55. When white light enters a plane of inverted prisms, the emerge light is rich of. a. Blue c. Red b. Violet d. white 56. On the surface of moon, Rainbows. a. Are never formed c. Are seen with inverted colours b. Are formed d. Are of two kinds 57. Total internal reflection as phenomena is useful in various optical instruments as. a. It requires only a pair of media c. It is based on refraction b. It is a simple reflection d. It does not lead to loss of energy 58. Twinkle of stars is due to A: refraction in atmosphere B: Atmospheric variation The correct statement is a. ‘A’ only c. Both ‘A’ and ‘B’ b. ‘B’ only d. Neither ‘A’ nor ‘B’ 59. The phenomena responsible for the light of SUN to stay beyond sunset is. a. Total internal reflection c. Scattering b. Refraction d. Dispersion 60. A laser/(Red) light is allowed through one vertical face of a glass slab. The light received on the opposite face is. a. Scattered c. Displaced b. Dispersed d. None of these 61. Image formed in a Myopic eye is. a. Before this iris c. Beyond the retina b. Before the retina d. On the cilliary muscles 62. Deviation of red colour is less in comparison to blue as the refractive index. c. μy= μr a. μv> μr b. μr> μv d. none of these 63. Astigmatic eye has problem in viewing images uniformly on the lines? a. Left and right c. Up and down b. Front and back d. Horizontal and vertical 64. A hypermetropic person has a least distance of distinct vision of 40 cm. the power of lens required for him is. a. -1.5 D c. -2.5 D b. +1.5 D d. +2.5 D 65. A ray of light of wavelength λ undergoes scattering proportional to. a. λ 4 c. 1/ λ4 2 b. λ d. λ-2

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66. With age near point and far point recedes due to A: weakening of ciliary muscles B: Reducing ability to change the focal length a. ‘A’ is correct c. Both ‘A’ and ‘B’ are correct b. ‘B’ is correct d. Neither ‘A’ and ‘B’ is correct 67. The number of frames to be projected per second for a good motion picture. a. 8 b. 16 c. 24 d. 28 68. Explosion on the surface of moon is not heard on the surface of earth as. a. The sound is faint c. The energy released is less b. There is no atmosphere in moon d. More light than sound is released 69. The black opening between the aqueous hum our and the lens is called? a. Retina c. Cornea b. Iris d. pupil 70. Focal length of relaxed eye is. a. 7.5 cm c. 2.5 cm b. 10 cm d. 25 cm 71. The odd phenomenon out of the following is. a. Blue of sky c. Twinkle stars b. Reddish sun d. White to glass 72. In which of the following cases will total internal reflection not take place? a. Glass to water c. Water to air b. Glass to air d. Water to glass 73. Tyndall effect is a. c. Scattering a. Reflection b. Refraction d. Total internal reflection 74. Concave lens is a. a. Converging lens c. Sometimes converges, sometimes diverges b. Diverging lens d. Diverges only the parallel beams 75. Combination (in ) of a convex and concave lens is a. A convex lens c. A slab b. A concave lens d. May be concave , a convex or a slab 76. Path of light through a solution is visible clearly. So the solution is. a. True c. Suspension b. Colloidal d. dancing

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