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Free download in PDF Human Eye and Colourful World Multiple Choice Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
(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
(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
(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
(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
(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
(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
(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
(16)
The broad wavelength range of visible spectrum is-
[A]
4000-8000A
[B]
2000-4000A
[C]
10000-20000A
[D]
None of the above
(17)
Which colour suffers least deviation on passing through a prism?
[A]
Red
[B]
Violet
[C]
Indigo
[D]
All of the Above
(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
(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
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