| 1. | Near and far points of a young person normal eye respectively are ? | |
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25 cm and 150 cm
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25 cm and infinity
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0 and 25 cm
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0 and infinity
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Report Question| 2. | Which of the following statement is correct regarding the propagation of light of different colours of light in air ? | |
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Yellow lights moves with the mean speed as that of the red and the violet light.
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Blue light moves faster than green light
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All the colours of the white light move with the same speed
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Red light moves fastest
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| 3. | The least distance of distinct vision for a young adult with normal vision is ? | |
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25m
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20cm
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20m
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25cm
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| 4. | The deflection of light by minute particles and molecules of the atmosphere in all direction is called ____________ of light ? | |
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tyndell effect
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interference
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dispersion
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scattering
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| 5. | Consider the following statements and choose the incorrect one ? | |
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The dispersion of white light occurs because colours of white light travel at different speeds through the glass prism.
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The splitting up of white light into seven colours on passing through a transparent medium like a glass prism is called dispersion of light.
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The band of seven colours formed on a white screen, when a beam of white light is passes through a glass prism.
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All the above.
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| 6. | The amount of light entering the human eye is controlled by ? | |
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Iris
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Cornea
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Ciliary muscles
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Pupil
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| 7. | The __ colour is at the top and ____ colour is at the bottom of spectrum. ? | |
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Red, Blue
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Violet, red
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Red, Violet
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None
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| 8. | 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 ? | |
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moves fastest in air.
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is absorbed the most by smoke or fog.
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is scattered the most by smoke or fog.
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is scattered the least by smoke or fog.
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| 9. | The splitting of white light into different colours on passing through a prism is called ? | |
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deviation
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dispersion
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refraction
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reflection
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| 10. | One cannot see through the fog, because ? | |
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fog absorbs light
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light is scattered by the droplets
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light suffers total reflection at droplets
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refractive index of the fog is very high
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