Multiple Choice Questions

The Human Eye and the Colourful World

Updated for CBSE 2027
Board Exam Preparation
118+ Practice Questions
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Practice Questions with Answers

Total 118 questions available

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Q. 1
A student of class 10, is not able to see clearly the black board Question when seated at a distance of 5 m from the board, the defect he is suffering from is
A
Cornea
B
Astigmatism
C
Myopia
D
Presbyopia
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Q. 2
Bi-focal lens are required to correct
A
presbyopia
B
myopia
C
coma
D
astigmatism
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Q. 3
The fluid between the retina and eye is called
A
Aqueous humour
B
Angle of dispersion
C
vitreous humour
D
Angle of deviation
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Q. 4
What causes the Sun to appear red at sunrise and sunset?
A
Lesser scattering of red light
B
Greater scattering of red light
C
Greater absorption of red light
D
Lesser absorption of red light
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Q. 5
If a person can see a doll at the far distance, but he cannot read the newspaper in his hands. What lens should he wear to make correct his eyesight?
A
Bi-focal lens
B
Prism
C
Convex lens
D
Concave lens
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Q. 6
The power of lens being +4 D, suggests that it is :
A
Concave lens
B
none
C
Plane convex lens
D
Convex lens
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Q. 7
The persistence of vision for the human eye is :
A
1/10th of a sec nd
B
1/10th of a second
C
1/16th of a second
D
1/6th of a second
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Q. 8
The passage through which tears pass is :
A
Eyeball
B
Cornea
C
Tear gland
D
Tear duct
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Q. 9
What affects the amount of scattering of light?
A
Temperature of the atmosphere
B
Intensity of light
C
Wavelength of light
D
Altitude of the observer
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Q. 10
Why does the Sun appear red at sunrise and sunset?
A
Due to reflection of red light
B
Due to absorption of red light
C
Due to refraction of light
D
Due to scattering of light
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Q. 11
Human eye acts like a -------.
A
Endoscope
B
Microscope
C
Telescope
D
Camera
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Q. 12
Which color of light has the maximum speed in glass?
A
Blue
B
Red
C
Violet
D
Green
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Q. 13
The splitting of white light into different colours on passing through a prism is called:
A
deviation
B
dispersion
C
refraction
D
reflection
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Q. 14
At a particular minimum angle of deviation, the prism is under :
A
Inclined at 45degrees w.r.t base of prism
B
Minimum deviation position
C
Minimum or maximum deviation position
D
Maximum deviation position
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Q. 15
A person cannot see the distant objects clearly (though he can see the nearby objects clearly). He is suffering from the defect of vision called:
A
Presbyopia
B
Myopia
C
Cataract
D
Lens
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Q. 16
The layer of the eye which can be compared to the photographic film in a camera is
A
Retina
B
Cornea
C
Eyelid
D
Iris
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Q. 17
The near point and the far point are determined with regards to the function of which part of the eye?
A
Ciliary muscles
B
Eye-ball
C
Retina
D
Pupil
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Q. 18
Which of the following is the correct order of wavelength?
A
Yellow> Green> Violet
B
Red> Green> Yellow
C
Red> Yellow> Orange
D
Orange>Yellow>Green
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Q. 19
Which color of light has the lowest speed in glass?
A
Blue
B
Red
C
Violet
D
Green
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Q. 20
The defect of vision in which a person cannot see the distant objects clearly but can see nearby objects clearly is called:
A
hypermetropia
B
bifocal eye
C
myopia
D
presbyopia
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Q. 21
What is atmospheric refraction?
A
Bending of light within the Earth's core
B
Bending of light through the Earth's atmosphere
C
Reflection of light off the Earth's surface
D
Absorption of light by the Earth's atmosphere
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Q. 22
What determines the color of scattered light?
A
Intensity of light
B
Temperature of the atmosphere
C
Size of the particles
D
Distance traveled by light
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Q. 23
Ability of combination of dual vision of eyes is called :
A
Binocular vision
B
Bright vision
C
Dim vision
D
Concave vision
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Q. 24
When white light enters a glass prism from air, the angle of deviation is least for:
A
blue light
B
violet light
C
yellow light
D
red light
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Q. 25
How does the bending of light vary with the wavelength?
A
No relationship between wavelength and bending
B
Higher wavelength leads to greater bending
C
Higher wavelength leads to lesser bending
D
Bending is independent of wavelength
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Q. 26
In absence of atmosphere the colour of the sky appears:
A
Black
B
Blue
C
Red
D
Yellow
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Q. 27
What is the relationship between the wavelength of light and the refractive index of a material?
A
Exponential
B
Directly proportional
C
Inversely proportional
D
No relationship
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Q. 28
When white light enters a glass prism from air, the angle of deviation is maximum for:
A
red light
B
violet light
C
blue light
D
yellow light
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Q. 29
The light sensitive cell present on retina and is sensitive to the intensity of light is:
A
rods
B
cones
C
none of these
D
both rods and cones
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Q. 30
The least distance of distinct vision for a young adult with normal vision is about :
A
2.5 m
B
25 m
C
2.5 cm
D
25 cm
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Q. 31
The variation of focal length to form a sharp image on the retina is called ----.
A
Long-sightedness
B
Sutter
C
Accommodation
D
Far-sightedness
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Q. 32
The phenomenon responsible for working of human eye is
A
reflection
B
Refraction
C
Power of accommodation
D
Persistence of vision
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Q. 33
What is the phenomenon called when light is spread by air molecules?
A
Scattering
B
Reflection
C
Refraction
D
Absorption
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Q. 34
The angle between two refracting surfaces of prism is :
A
Deviation
B
Emergence
C
Incidence
D
Prism
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Q. 35
What determines the visibility of the path of sunlight in a dark room?
A
Presence of air molecules
B
Size of the room
C
Temperature of the room
D
Scattering of sunlight by dust particles
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Q. 36
The sky appears dark to passengers flying at very high altitudes mainly because :
A
Scattering of light is not enough at such heights.
B
There is no atmosphere at great heights.
C
The size of molecules is smaller than the wavelength of visible light.
D
The light gets scattered towards the earth.
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Q. 37
The splitting of white light into different colours on passing through a prism is called
A
dispersion
B
reflection
C
Maxwell
D
Faraday
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Q. 38
The medical condition in which the lens of the eye of a person becomes progressively cloudy resulting in blurred vision is called:
A
presbyopia
B
myopia
C
cataract
D
hypermetropia
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Q. 39
Twinkling of stars is due to:
A
atmospheric refraction of starlight
B
dispersion of light by water drops
C
scattering of light by dust particles
D
reflection of light by clouds
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Q. 40
The defect caused by the weakening of ciliary muscles is:
A
Astigmatism
B
Myopia
C
Presbyopia
D
Hypermetropia
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Q. 41
At noon, the Sun appears white as:
A
red colour is scattered the most
B
blue colour is scattered the most
C
all the colours of the white light are scattered away
D
light is least scattered
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Q. 42
The colour of sky is blue during day time, red during sunset and black at night. This is due to
A
Atmospheric refraction
B
Scattering of light
C
Small particles present in atmosphere
D
All of the above.
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Q. 43
The colour of the sky is blue during the day time and red during sunset and black at night due to:
A
Small particles present in the atmosphere
B
Scattering of light
C
Atmospheric refraction
D
All of the above
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Q. 44
What phenomenon causes the oval appearance of the sun at sunrise and sunset?
A
Atmospheric reflection
B
Atmospheric absorption
C
Atmospheric refraction
D
Atmospheric dispersion
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Q. 45
When a ray passes through a prism ______.
A
It bends towards the base
B
Persistence of vision
C
It remain parallel to a base
D
Power of accommodation
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Q. 46
How does the refractive index of a material affect the bending of light?
A
Refractive index does not affect bending
B
Higher refractive index leads to more bending
C
Lower refractive index leads to more bending
D
Refractive index affects only the speed of light
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Q. 47
The light-sensitive cell present on the retina and is sensitive to the intensity of light is :
A
Both rods and cones
B
Cones
C
None of these
D
Rods
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Q. 48
Due to atmospheric refraction, the apparent length of the day.
A
Decreases
B
Increases
C
Remains same
D
None of these
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Q. 49
For a young adult with normal vision the far point is :
A
2.5Km
B
20Km
C
25Km
D
Infinity
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Q. 50
The defect of the eye in which the eyeball becomes too long is
A
Virtual and inverted
B
myopia
C
hypermetropia
D
Virtual and erect
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Q. 51
The phenomenon of light responsible for the working of human eye is :
A
Persistence of vision
B
Power of accommodation
C
Refraction
D
Reflection
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Q. 52
The part of eye that is a messenger of electrochemical signals from eye to brain is called :
A
Eyelash
B
Eyelid
C
Iris
D
Optic nerve
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Q. 53
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
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Q. 54
The image on the retina remains for 1/16th of sec. This is called as:
A
Persistence of vision
B
Both a and b
C
Accomodation
D
None
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Q. 55
Which of the following colours is least scattered by fog, dust or smoke :
A
Yellow
B
Red
C
Violet
D
Blue
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Q. 56
When a person is myopic, he/ she can clearly see
A
Neither nearby nor far off objects
B
only far off objects
C
both nearby and far off objects
D
Only nearby objects
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Q. 57
The image formed by retina of human eye is :
A
Increases
B
Permanent
C
temporary
D
Blurred
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Q. 58
The colour of sky is blue during day time, red during sunset and black at night. This is due to
A
Atmospheric refraction
B
Scattering of light
C
All of the above.
D
Small particles present in atmosphere
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Q. 59
Which colour which has maximum frequency?
A
Green
B
Yellow
C
Violet
D
Blue
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Q. 60
How do different colors of light travel in a transparent medium like glass or water?
A
At different speeds depending on the wavelength
B
At the same speed for all wavelengths
C
Faster than in a vacuum
D
Slower than in a vacuum
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Q. 61
The amount of light entering the human eye is controlled by:
A
Iris
B
Cornea
C
Pupil
D
Ciliary muscles
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Q. 62
Why do stars appear higher in the sky than they actually are?
A
Due to atmospheric reflection
B
Due to atmospheric absorption
C
Due to atmospheric refraction
D
Due to atmospheric diffraction
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Q. 63
The sun appears oval-shaped or flattened due to:
A
Dispersion
B
Scattering
C
Atmospheric reflection
D
Atmospheric refraction
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Q. 64
Twinkling of stars is due to atmospheric
A
scattering of light by dust particles
B
internal reflection of light by clouds.
C
dispersion of light by water droplets
D
refraction of light by different layers of varying refractive indices
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Q. 65
A rainbow is always formed in a direction
A
Concave lens
B
Plane convex lens
C
Below the sun
D
Opposite to the sun
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Q. 66
The muscular diaphragm that controls the sides of pupil is :
A
Critical angle
B
Iris
C
Retina
D
Can be differentiated
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Q. 67
The defect of vision in which a person is able to see nearby objects clearly, but not far objects is called:
A
Long-sightedness or Hypermetropia
B
Cataract
C
Astigmatism
D
Short-sightedness or myopia
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Q. 68
Which part of the eye refracts light entering the eye from external objects?
A
cornea
B
Retina
C
Lens
D
None
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Q. 69
The defect in which a person is able to see far objects clearly but not nearby objects is called
A
cataract
B
Long sightedness or Hypermetropia
C
Astigmatism
D
Short sightedness or myopia
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Q. 70
What effect does atmospheric refraction have on sunrise and sunset?
A
Reduced duration of sunrise and sunset
B
No effect on sunrise and sunset
C
Delayed sunrise and advanced sunset
D
Advanced sunrise and delayed sunset
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Q. 71
Which of the following is the correct order of speed of light in glass?
A
Violet>Green>Red
B
Red>Green>Blue
C
Green> Red> Blue
D
Blue> Green> Red
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Q. 72
Hypermetropia can be corrected by:
A
Plano-concave lens
B
Concave lens
C
Plano-convex lens
D
Convex lens
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Q. 73
In a vacuum, how do different colors of white light travel?
A
At different speeds depending on the wavelength
B
Slower than in a transparent medium
C
At the same speed for all wavelengths
D
Faster than in a transparent medium
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Q. 74
What does the refractive index of a material vary with?
A
Pressure
B
Color of light
C
Temperature
D
Density
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Q. 75
The change in focal length of an eye lens is caused by the action of the :
A
Iris
B
Ciliary muscles
C
Retina
D
Pupil
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Q. 76
What causes the sky to appear blue?
A
Scattering of light
B
Reflection of blue light
C
Absorption of blue light
D
Refraction of light
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Q. 77
The near-point of a hypermetropic eye is more than 25 cm away.
Reason: Hypermetropia is corrected using spectacles containing concave lenses.
A
A is true but R is false.
B
Both A and R are true and R is the correct explanation of (a)
C
Both A and R are true but R is not the correct explanation of (a)
D
Both A and R are false.
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Q. 78
The light sensitive cell present on retina and is sensitive to the intensity of light is :
A
Both cone and rod cells
B
cones
C
Rod cell
D
None
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Q. 79
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
It goes undeviated
B
It remain parallel to a base
C
is scattered the least by smoke or fog.
D
is scattered the most by smoke or fog.
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Q. 80
When looking at nearby objects the muscles ____ the eye lens so as to __ its focal length.
A
Expands, increase
B
Compresses, decreases
C
Expands, decrease
D
Compresses, increases
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Q. 81
A transparent refracting material which is bounded by two plane refracting surfaces is :
A
Glass slab
B
Retina
C
Cornea
D
Prism
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Q. 82
Long sightedness is caused by eyeball being too short. It can be corrected by :
A
Plane mirror
B
Using convergent lens
C
Divergent lens
D
None
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Q. 83
The part of the eye where optic nerve enters the eye is
A
Choroid
B
Sclera
C
Retina
D
Blind spot
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Q. 84
What determines the color of the scattered light when sunlight enters the Earth's atmosphere?
A
Composition of the atmosphere
B
Wavelength of the light
C
Density of the atmosphere
D
Intensity of the light
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Q. 85
The change in focal length of human eye is caused due to –
A
cataract
B
Cornea
C
Ciliary muscles
D
presbyopia
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Q. 86
When white light enters a prism, it gets split into its constituent colours. This is due to
A
Scattering of light
B
each colours has same velocity in the prism.
C
different refractive index for different wavelength of each colour
D
prism material have high density.
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Q. 87
The persistence of vision for human eye is-
A
1/16th of a sec
B
1/6th of a sec
C
2/16th of a sec
D
1/26th of a sec
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Q. 88
The human eye can focus objects at different distances by adjusting the focal length of the eye lens. This is due to
A
accommodation
B
near-sightedness
C
far-sightedness
D
presbyopia
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Q. 89
Which of the following statements is correct regarding the propagation of light of different colours of white light in air?
A
Minimum or maximum deviation position
B
All the colours of the white light move with the same speed.
C
Red light moves fastest.
D
Inclined at 45degrees w.r.t base of prism
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Q. 90
The coloured light that refracts most while passing through a prism is :
A
Red
B
Yellow
C
Violet
D
Blue
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Q. 91
The image formed by the retina of the human eye is:
A
Real and inverted
B
Real and erect
C
Virtual and erect
D
Virtual and inverted
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Q. 92
The part of the eyes refracts light entering the eye from external objects ?
A
Pupil
B
Cornea
C
Lens
D
Iris
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Q. 93
The image formed by retina of human eye is :
A
Real and erect
B
Virtual and erect
C
Real and inverted
D
Virtual and inverted
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Q. 94
The __ colour is at the top and ____ colour is at the bottom of spectrum.
A
Red, Yello
B
Violet, red
C
Blue ,red
D
Violet,red
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Q. 95
The value of least distance of distinct vision for a normal human eye is
A
45cm
B
35cm
C
55cm
D
4.5cm
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Q. 96
The change in focal length of the eye to focus the image of objects at varying distances is done by the action of
A
Eyelash
B
Ciliary muscle
C
Cornea
D
Eyelid
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Q. 97
Sunlight is a mixture of __ visible colours
A
7
B
6
C
none
D
8
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Q. 98
Who discovered the experiments with glass prism that white light consists of seven colours
A
Newton
B
Faraday
C
Young
D
Maxwell
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Q. 99
When the muscles are relaxed, the eye lens is ______ and the distant objects can be seen clearly.
A
Thin
B
Deviation
C
Inclined
D
Thick
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Q. 100
Having two eyes facilities :
A
Developing concept of distance
B
Increasing the field view
C
Three dimensional view
D
All
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Q. 101
The least distance of distinct vision for a young adult with normal vision is about
A
25 cm.
B
0.25 cm.
C
2.5 cm.
D
25 m.
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Q. 102
Image formed in normal eye of human is:
A
Increases
B
beyond retina
C
on retina
D
None
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Q. 103
Astigmatism occurs when the cornea does not have a truly spherical shape. The defect can be cured by :
A
Plane convex lens
B
Cylindrical shape
C
Concave lens
D
Convex lens
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Q. 104
The coloured light that reflects most while passing through a prism is :
A
Green
B
Blue
C
Violet
D
yellow
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Q. 105
The defect caused by the weakening of ciliary muscles is
A
Hypermetropia
B
Convex lens
C
Presbyopia
D
Glass slab
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Q. 106
What happens to the speed of light of different colors in a vacuum?
A
They slow down
B
They travel at different speeds
C
They travel at the same speed
D
They accelerate
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Q. 107
When sunlight enters a dark room through a fine hole, what makes its path visible?
A
Refraction
B
Reflection
C
Absorption
D
Scattering
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Q. 108
Myopia can be corrected by using
A
Plano- concave lens
B
Convex lens
C
Concave lens
D
Glass slab
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Q. 109
Which color of light bends the least in a transparent medium like glass?
A
Blue
B
Red
C
Violet
D
Green
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Q. 110
Blue colour of the sky is due to the phenomenon of:
A
Refracts light
B
Dispersion of light
C
Scattering of light
D
Scatters light
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Q. 111
Which color of light tends to scatter more?
A
Blue
B
Red
C
Violet
D
Green
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Q. 112
The eye lens contains a liquid called :
A
refraction
B
Peroxide
C
Aqueous humour
D
deviation
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Q. 113
The value of least distance of distinct vision for a normal human eye is ________ .
A
25 cm
B
35 cm
C
70 cm
D
45 cm
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Q. 114
Which optical phenomenon can be explained by atmospheric refraction?
A
Twinkling of stars
B
Rainbow formation
C
Mirage formation
D
Polarization of light
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Q. 115
Which of the following phenomenon contributes significantly to the reddish appearance of the sun at sunrise or sunset?
A
Total internal Reflection
B
Reflection of light from the earth
C
Ciliary muscles
D
Cornea
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Q. 116
At noon, the Sun appears white as
A
red colour is scattered the most
B
light is least scattered
C
Behind retina
D
On retina
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Q. 117
Apparent position of the stars appears raised due to:
A
Reflection of light
B
Scattering of light
C
Dispersion of light
D
Atmospheric refraction
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Q. 118
The change in focal length of an eye lens is caused by the action of the
A
cones
B
None
C
iris.
D
ciliary muscles.
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