Multiple Choice Questions
The Human Eye and the Colourful World
Practice Questions with Answers
Total 118 questions available
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
CorneaB
AstigmatismC
MyopiaD
PresbyopiaClick an option to check your answer
Q. 2
Bi-focal lens are required to correct
A
presbyopiaB
myopiaC
comaD
astigmatismClick an option to check your answer
Q. 3
The fluid between the retina and eye is called
A
Aqueous humourB
Angle of dispersionC
vitreous humourD
Angle of deviationClick an option to check your answer
Q. 4
What causes the Sun to appear red at sunrise and sunset?
A
Lesser scattering of red lightB
Greater scattering of red lightC
Greater absorption of red lightD
Lesser absorption of red lightClick an option to check your answer
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 lensB
PrismC
Convex lensD
Concave lensClick an option to check your answer
Q. 6
The power of lens being +4 D, suggests that it is :
A
Concave lensB
noneC
Plane convex lensD
Convex lensClick an option to check your answer
Q. 7
The persistence of vision for the human eye is :
A
1/10th of a sec ndB
1/10th of a secondC
1/16th of a secondD
1/6th of a secondClick an option to check your answer
Q. 8
The passage through which tears pass is :
A
EyeballB
CorneaC
Tear glandD
Tear ductClick an option to check your answer
Q. 9
What affects the amount of scattering of light?
A
Temperature of the atmosphereB
Intensity of lightC
Wavelength of lightD
Altitude of the observerClick an option to check your answer
Q. 10
Why does the Sun appear red at sunrise and sunset?
A
Due to reflection of red lightB
Due to absorption of red lightC
Due to refraction of lightD
Due to scattering of lightClick an option to check your answer
Q. 11
Human eye acts like a -------.
A
EndoscopeB
MicroscopeC
TelescopeD
CameraClick an option to check your answer
Q. 12
Which color of light has the maximum speed in glass?
A
BlueB
RedC
VioletD
GreenClick an option to check your answer
Q. 13
The splitting of white light into different colours
on passing through a prism is called:
A
deviationB
dispersionC
refractionD
reflectionClick an option to check your answer
Q. 14
At a particular minimum angle of deviation, the prism is under :
A
Inclined at 45degrees w.r.t base of prismB
Minimum deviation positionC
Minimum or maximum deviation positionD
Maximum deviation positionClick an option to check your answer
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
PresbyopiaB
MyopiaC
CataractD
LensClick an option to check your answer
Q. 16
The layer of the eye which can be compared to the photographic film in a camera is
A
RetinaB
CorneaC
EyelidD
IrisClick an option to check your answer
Q. 17
The near point and the far point are determined
with regards to the function of which part of the
eye?
A
Ciliary musclesB
Eye-ballC
RetinaD
PupilClick an option to check your answer
Q. 18
Which of the following is the correct order of wavelength?
A
Yellow> Green> VioletB
Red> Green> YellowC
Red> Yellow> OrangeD
Orange>Yellow>GreenClick an option to check your answer
Q. 19
Which color of light has the lowest speed in glass?
A
BlueB
RedC
VioletD
GreenClick an option to check your answer
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
hypermetropiaB
bifocal eyeC
myopiaD
presbyopiaClick an option to check your answer
Q. 21
What is atmospheric refraction?
A
Bending of light within the Earth's coreB
Bending of light through the Earth's atmosphereC
Reflection of light off the Earth's surfaceD
Absorption of light by the Earth's atmosphereClick an option to check your answer
Q. 22
What determines the color of scattered light?
A
Intensity of lightB
Temperature of the atmosphereC
Size of the particlesD
Distance traveled by lightClick an option to check your answer
Q. 23
Ability of combination of dual vision of eyes is called :
A
Binocular visionB
Bright visionC
Dim visionD
Concave visionClick an option to check your answer
Q. 24
When white light enters a glass prism from air,
the angle of deviation is least for:
A
blue lightB
violet lightC
yellow lightD
red lightClick an option to check your answer
Q. 25
How does the bending of light vary with the wavelength?
A
No relationship between wavelength and bendingB
Higher wavelength leads to greater bendingC
Higher wavelength leads to lesser bendingD
Bending is independent of wavelengthClick an option to check your answer
Q. 26
In absence of atmosphere the colour of the sky appears:
A
BlackB
BlueC
RedD
YellowClick an option to check your answer
Q. 27
What is the relationship between the wavelength of light and the refractive index of a material?
A
ExponentialB
Directly proportionalC
Inversely proportionalD
No relationshipClick an option to check your answer
Q. 28
When white light enters a glass prism from air,
the angle of deviation is maximum for:
A
red lightB
violet lightC
blue lightD
yellow lightClick an option to check your answer
Q. 29
The light sensitive cell present on retina and is sensitive to the intensity of light is:
A
rodsB
conesC
none of theseD
both rods and conesClick an option to check your answer
Q. 30
The least distance of distinct vision for a young
adult with normal vision is about :
A
2.5 mB
25 mC
2.5 cmD
25 cmClick an option to check your answer
Q. 31
The variation of focal length to form a sharp image on the retina is called ----.
A
Long-sightednessB
SutterC
AccommodationD
Far-sightednessClick an option to check your answer
Q. 32
The phenomenon responsible for working of human eye is
A
reflectionB
RefractionC
Power of accommodationD
Persistence of visionClick an option to check your answer
Q. 33
What is the phenomenon called when light is spread by air molecules?
A
ScatteringB
ReflectionC
RefractionD
AbsorptionClick an option to check your answer
Q. 34
The angle between two refracting surfaces of prism is :
A
DeviationB
EmergenceC
IncidenceD
PrismClick an option to check your answer
Q. 35
What determines the visibility of the path of sunlight in a dark room?
A
Presence of air moleculesB
Size of the roomC
Temperature of the roomD
Scattering of sunlight by dust particlesClick an option to check your answer
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.Click an option to check your answer
Q. 37
The splitting of white light into different colours on passing through a prism is called
A
dispersionB
reflectionC
MaxwellD
FaradayClick an option to check your answer
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
presbyopiaB
myopiaC
cataractD
hypermetropiaClick an option to check your answer
Q. 39
Twinkling of stars is due to:
A
atmospheric refraction of starlightB
dispersion of light by water dropsC
scattering of light by dust particlesD
reflection of light by cloudsClick an option to check your answer
Q. 40
The defect caused by the weakening of ciliary
muscles is:
A
AstigmatismB
MyopiaC
PresbyopiaD
HypermetropiaClick an option to check your answer
Q. 41
At noon, the Sun appears white as:
A
red colour is scattered the mostB
blue colour is scattered the mostC
all the colours of the white light are scattered awayD
light is least scatteredClick an option to check your answer
Q. 42
The colour of sky is blue during day time, red during sunset and black at night. This is due to
A
Atmospheric refractionB
Scattering of lightC
Small particles present in atmosphereD
All of the above.Click an option to check your answer
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 atmosphereB
Scattering of lightC
Atmospheric refractionD
All of the aboveClick an option to check your answer
Q. 44
What phenomenon causes the oval appearance of the sun at sunrise and sunset?
A
Atmospheric reflectionB
Atmospheric absorptionC
Atmospheric refractionD
Atmospheric dispersionClick an option to check your answer
Q. 45
When a ray passes through a prism ______.
A
It bends towards the baseB
Persistence of visionC
It remain parallel to a baseD
Power of accommodationClick an option to check your answer
Q. 46
How does the refractive index of a material affect the bending of light?
A
Refractive index does not affect bendingB
Higher refractive index leads to more bendingC
Lower refractive index leads to more bendingD
Refractive index affects only the speed of lightClick an option to check your answer
Q. 47
The light-sensitive cell present on the retina and
is sensitive to the intensity of light is :
A
Both rods and conesB
ConesC
None of theseD
RodsClick an option to check your answer
Q. 48
Due to atmospheric refraction, the apparent length of the day.
A
DecreasesB
IncreasesC
Remains sameD
None of theseClick an option to check your answer
Q. 49
For a young adult with normal vision the far point is :
A
2.5KmB
20KmC
25KmD
InfinityClick an option to check your answer
Q. 50
The defect of the eye in which the eyeball becomes too long is
A
Virtual and invertedB
myopiaC
hypermetropiaD
Virtual and erectClick an option to check your answer
Q. 51
The phenomenon of light responsible for the working of human eye is :
A
Persistence of visionB
Power of accommodationC
RefractionD
ReflectionClick an option to check your answer
Q. 52
The part of eye that is a messenger of electrochemical signals from eye to brain is called :
A
EyelashB
EyelidC
IrisD
Optic nerveClick an option to check your answer
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 DB
, + 0.5 DC
- 0.2 DD
,= 0.2 DClick an option to check your answer
Q. 54
The image on the retina remains for 1/16th of sec. This is called as:
A
Persistence of visionB
Both a and bC
AccomodationD
NoneClick an option to check your answer
Q. 55
Which of the following colours is least scattered by fog, dust or smoke :
A
YellowB
RedC
VioletD
BlueClick an option to check your answer
Q. 56
When a person is myopic, he/ she can clearly see
A
Neither nearby nor far off objectsB
only far off objectsC
both nearby and far off objectsD
Only nearby objectsClick an option to check your answer
Q. 57
The image formed by retina of human eye is :
A
IncreasesB
PermanentC
temporaryD
BlurredClick an option to check your answer
Q. 58
The colour of sky is blue during day time, red during sunset and black at night. This is due to
A
Atmospheric refractionB
Scattering of lightC
All of the above.D
Small particles present in atmosphereClick an option to check your answer
Q. 59
Which colour which has maximum frequency?
A
GreenB
YellowC
VioletD
BlueClick an option to check your answer
Q. 60
How do different colors of light travel in a transparent medium like glass or water?
A
At different speeds depending on the wavelengthB
At the same speed for all wavelengthsC
Faster than in a vacuumD
Slower than in a vacuumClick an option to check your answer
Q. 61
The amount of light entering the human eye is controlled by:
A
IrisB
CorneaC
PupilD
Ciliary musclesClick an option to check your answer
Q. 62
Why do stars appear higher in the sky than they actually are?
A
Due to atmospheric reflectionB
Due to atmospheric absorptionC
Due to atmospheric refractionD
Due to atmospheric diffractionClick an option to check your answer
Q. 63
The sun appears oval-shaped or flattened due to:
A
DispersionB
ScatteringC
Atmospheric reflectionD
Atmospheric refractionClick an option to check your answer
Q. 64
Twinkling of stars is due to atmospheric
A
scattering of light by dust particlesB
internal reflection of light by clouds.C
dispersion of light by water dropletsD
refraction of light by different layers of varying refractive indicesClick an option to check your answer
Q. 65
A rainbow is always formed in a direction
A
Concave lensB
Plane convex lensC
Below the sunD
Opposite to the sunClick an option to check your answer
Q. 66
The muscular diaphragm that controls the sides of pupil is :
A
Critical angleB
IrisC
RetinaD
Can be differentiatedClick an option to check your answer
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 HypermetropiaB
CataractC
AstigmatismD
Short-sightedness or myopiaClick an option to check your answer
Q. 68
Which part of the eye refracts light entering the eye from external objects?
A
corneaB
RetinaC
LensD
NoneClick an option to check your answer
Q. 69
The defect in which a person is able to see far objects clearly but not nearby objects is called
A
cataractB
Long sightedness or HypermetropiaC
AstigmatismD
Short sightedness or myopiaClick an option to check your answer
Q. 70
What effect does atmospheric refraction have on sunrise and sunset?
A
Reduced duration of sunrise and sunsetB
No effect on sunrise and sunsetC
Delayed sunrise and advanced sunsetD
Advanced sunrise and delayed sunsetClick an option to check your answer
Q. 71
Which of the following is the correct order of speed of light in glass?
A
Violet>Green>RedB
Red>Green>BlueC
Green> Red> BlueD
Blue> Green> RedClick an option to check your answer
Q. 72
Hypermetropia can be corrected by:
A
Plano-concave lensB
Concave lensC
Plano-convex lensD
Convex lensClick an option to check your answer
Q. 73
In a vacuum, how do different colors of white light travel?
A
At different speeds depending on the wavelengthB
Slower than in a transparent mediumC
At the same speed for all wavelengthsD
Faster than in a transparent mediumClick an option to check your answer
Q. 74
What does the refractive index of a material vary with?
A
PressureB
Color of lightC
TemperatureD
DensityClick an option to check your answer
Q. 75
The change in focal length of an eye lens is caused
by the action of the :
A
IrisB
Ciliary musclesC
RetinaD
PupilClick an option to check your answer
Q. 76
What causes the sky to appear blue?
A
Scattering of lightB
Reflection of blue lightC
Absorption of blue lightD
Refraction of lightClick an option to check your answer
Q. 77
The near-point of a hypermetropic eye is more than 25 cm away.
Reason: Hypermetropia is corrected using spectacles containing concave lenses.
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.Click an option to check your answer
Q. 78
The light sensitive cell present on retina and is sensitive to the intensity of light is :
A
Both cone and rod cellsB
conesC
Rod cellD
NoneClick an option to check your answer
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 undeviatedB
It remain parallel to a baseC
is scattered the least by smoke or fog.D
is scattered the most by smoke or fog.Click an option to check your answer
Q. 80
When looking at nearby objects the muscles ____ the eye lens so as to __ its focal length.
A
Expands, increaseB
Compresses, decreasesC
Expands, decreaseD
Compresses, increasesClick an option to check your answer
Q. 81
A transparent refracting material which is bounded by two plane refracting surfaces is :
A
Glass slabB
RetinaC
CorneaD
PrismClick an option to check your answer
Q. 82
Long sightedness is caused by eyeball being too short. It can be corrected by :
A
Plane mirrorB
Using convergent lensC
Divergent lensD
NoneClick an option to check your answer
Q. 83
The part of the eye where optic nerve enters the eye is
A
ChoroidB
ScleraC
RetinaD
Blind spotClick an option to check your answer
Q. 84
What determines the color of the scattered light when sunlight enters the Earth's atmosphere?
A
Composition of the atmosphereB
Wavelength of the lightC
Density of the atmosphereD
Intensity of the lightClick an option to check your answer
Q. 85
The change in focal length of human eye is caused due to –
A
cataractB
CorneaC
Ciliary musclesD
presbyopiaClick an option to check your answer
Q. 86
When white light enters a prism, it gets split into its constituent colours. This is due to
A
Scattering of lightB
each colours has same velocity in the prism.C
different refractive index for different wavelength of each colourD
prism material have high density.Click an option to check your answer
Q. 87
The persistence of vision for human eye is-
A
1/16th of a secB
1/6th of a secC
2/16th of a secD
1/26th of a secClick an option to check your answer
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
accommodationB
near-sightednessC
far-sightednessD
presbyopiaClick an option to check your answer
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 positionB
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 prismClick an option to check your answer
Q. 90
The coloured light that refracts most while
passing through a prism is :
A
RedB
YellowC
VioletD
BlueClick an option to check your answer
Q. 91
The image formed by the retina of the human eye
is:
A
Real and invertedB
Real and erectC
Virtual and erectD
Virtual and invertedClick an option to check your answer
Q. 92
The part of the eyes refracts light entering the eye
from external objects ?
A
PupilB
CorneaC
LensD
IrisClick an option to check your answer
Q. 93
The image formed by retina of human eye is :
A
Real and erectB
Virtual and erectC
Real and invertedD
Virtual and invertedClick an option to check your answer
Q. 94
The __ colour is at the top and ____ colour is at the bottom of spectrum.
A
Red, YelloB
Violet, redC
Blue ,redD
Violet,redClick an option to check your answer
Q. 95
The value of least distance of distinct vision for a normal human eye is
A
45cmB
35cmC
55cmD
4.5cmClick an option to check your answer
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
EyelashB
Ciliary muscleC
CorneaD
EyelidClick an option to check your answer
Q. 97
Sunlight is a mixture of __ visible colours
A
7B
6C
noneD
8Click an option to check your answer
Q. 98
Who discovered the experiments with glass prism that white light consists of seven colours
A
NewtonB
FaradayC
YoungD
MaxwellClick an option to check your answer
Q. 99
When the muscles are relaxed, the eye lens is ______ and the distant objects can be seen clearly.
A
ThinB
DeviationC
InclinedD
ThickClick an option to check your answer
Q. 100
Having two eyes facilities :
A
Developing concept of distanceB
Increasing the field viewC
Three dimensional viewD
AllClick an option to check your answer
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.Click an option to check your answer
Q. 102
Image formed in normal eye of human is:
A
IncreasesB
beyond retinaC
on retinaD
NoneClick an option to check your answer
Q. 103
Astigmatism occurs when the cornea does not have a truly spherical shape. The defect can be cured by :
A
Plane convex lensB
Cylindrical shapeC
Concave lensD
Convex lensClick an option to check your answer
Q. 104
The coloured light that reflects most while passing through a prism is :
A
GreenB
BlueC
VioletD
yellowClick an option to check your answer
Q. 105
The defect caused by the weakening of ciliary muscles is
A
HypermetropiaB
Convex lensC
PresbyopiaD
Glass slabClick an option to check your answer
Q. 106
What happens to the speed of light of different colors in a vacuum?
A
They slow downB
They travel at different speedsC
They travel at the same speedD
They accelerateClick an option to check your answer
Q. 107
When sunlight enters a dark room through a fine hole, what makes its path visible?
A
RefractionB
ReflectionC
AbsorptionD
ScatteringClick an option to check your answer
Q. 108
Myopia can be corrected by using
A
Plano- concave lensB
Convex lensC
Concave lensD
Glass slabClick an option to check your answer
Q. 109
Which color of light bends the least in a transparent medium like glass?
A
BlueB
RedC
VioletD
GreenClick an option to check your answer
Q. 110
Blue colour of the sky is due to the phenomenon of:
A
Refracts lightB
Dispersion of lightC
Scattering of lightD
Scatters lightClick an option to check your answer
Q. 111
Which color of light tends to scatter more?
A
BlueB
RedC
VioletD
GreenClick an option to check your answer
Q. 112
The eye lens contains a liquid called :
A
refractionB
PeroxideC
Aqueous humourD
deviationClick an option to check your answer
Q. 113
The value of least distance of distinct vision for a
normal human eye is ________ .
A
25 cmB
35 cmC
70 cmD
45 cmClick an option to check your answer
Q. 114
Which optical phenomenon can be explained by atmospheric refraction?
A
Twinkling of starsB
Rainbow formationC
Mirage formationD
Polarization of lightClick an option to check your answer
Q. 115
Which of the following phenomenon contributes significantly to the reddish appearance of the sun at sunrise or sunset?
A
Total internal ReflectionB
Reflection of light from the earthC
Ciliary musclesD
CorneaClick an option to check your answer
Q. 116
At noon, the Sun appears white as
A
red colour is scattered the mostB
light is least scatteredC
Behind retinaD
On retinaClick an option to check your answer
Q. 117
Apparent position of the stars appears raised due to:
A
Reflection of lightB
Scattering of lightC
Dispersion of lightD
Atmospheric refractionClick an option to check your answer
Q. 118
The change in focal length of an eye lens is caused by the action of the
A
conesB
NoneC
iris.D
ciliary muscles.Click an option to check your answer
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