Human Eye and Colourful World MCQs | Human Eye and Colourful World Multiple Choice Questions and Answers

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Questions
1 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

Answer: ─0.5 D
2 At noon the sun appears white as
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

Answer: light is least scattered
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3 Twinkling of stars is due to atmospheric
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 None of the above

Answer: refraction of light by different layers of varying refractive indices
4 The clear sky appears blue, because
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

Answer: violet and blue lights get scattered more than lights of all other colours by the atmosphere
5 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
A is scattered the most by smoke or fog
B is scattered the least by smoke or fog
C is absorbed the most by smoke or fog
D moves fastest in air

Answer: is scattered the least by smoke or fog
6 The bluish colour of water in deep sea is due to
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

Answer: scattering of light
7 When light rays enter the eye, most of the refraction occurs at the
A crystalline lens
B outer surface of the cornea
C iris
D pupil

Answer: outer surface of the cornea
8 Which of the following statements is correct?
A A person with myopia can see distant objects clearly
B A person with hypermetropia can see nearby objects clearly
C A person with myopia can see nearby objects clearly
D A person with hypermetropia cannot see distant objects clearly

Answer: A person with myopia can see nearby objects clearly
9 The change in the focal length of human eye is caused due to
A Ciliary muscles
B Pupil
C Cornea
D Iris

Answer: Ciliary muscles
10 The least distance of distinct vision for a young adult with normal vision is
A 25 m
B 20 m
C 25 cm
D 20 cm

Answer: 25 cm
11 The persistence of vision for human eye is
A 1/10th of a second
B 1/16th of a second
C 1/6th of the second
D 1/18th of a second

Answer: 1/16th of a second
12 The part of the eyes refracts light entering the eye from external objects?
A Lens
B Cornea
C Iris
D Pupil

Answer: Cornea
13 When we enter a cinema hall, we cannot see properly for a short time. This is because-
A Pupil does not open
B Pupil does not close
C Adjustment of size of pupil takes some time
D None of these above

Answer: Adjustment of size of pupil takes some time
14 The property of persistence of vision is used in-
A Short sightedness
B Long sightedness
C Cinematography
D Colour vision

Answer: Cinematography
15 A concave lens of suitable focal length is used for correcting a-
A Myopic eye
B Hypermetropic eye
C Both a and b
D None of the above

Answer: Myopic eye
16 The broad wavelength range of visible spectrum is-
A 4000-8000A
B 2000-4000A
C 10000-20000A
D None of the above

Answer: 4000-8000A
17 Which colour suffers least deviation on passing through a prism?
A Red
B Violet
C Indigo
D All of the Above

Answer: Red
18 Blue colour of sky is due to-
A Scattering of light
B Reflection of light
C Refraction of light
D All of the above

Answer: Scattering of light
19 A human eye can focus objects at different distances by adjusting the focal length of the eye lens. This is due to –
A Persistence of vision
B Near sightedness
C Accommodation
D Far sightedness

Answer: Accommodation
20 The change of focal length of an eye lens to focus the image of objects at varying distances is done by the action of the -
A Pupil
B Retina
C Ciliary muscles
D Blind spot

Answer: Ciliary muscles
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