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human Eye And coloful World

Total questions: 168

Worksheet time: 1hrs 29mins

Name
Class
Date
1.

The perpendicular line drawn from the surface of any surface is called as

a)

Normal

b)

Incident Ray

c)

Refracted ray

d)

Emergent ray

2.

A ray of white light enters the raindrop and undergoes __________ and __________ to form a spectrum.

a)

refraction; dispersion

b)

reflection; dispersion

c)

dispersion; diffraction

d)

scattering; dispersion

3.

The refraction of light passed by the Earth’s Atmosphere having air layers of varying __________ is called atmospheric refraction.

a)

optical densities

b)

densities

c)

volumes of air

d)

winds

4.

Statement: Blue light scatters more than red light during

a)

day time

b)

night time

c)

twilight

d)

none of the above

5.

Red light has

a)

longer wavelength

b)

shorter wavelength

c)

longer frequency

d)

none of the above

6.

One cannot see through the fog, because

a)

refractive index of the fog is very high

b)

fog absorbs light

c)

light is scattered by the droplets

d)

light suffers total reflection at droplets

7.

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 absorbed the most by smoke or fog

c)

is scattered the least by smoke or fog

d)

moves fastest in air

8.

Which of the following is a natural phenomenon which is caused by the dispersion of sunlight in the sky?

a)

Rainbow

b)

Twinkling of stars

c)

Advanced sunrise and delayed sunset

d)

Stars seem higher than they actually are

9.

Which of the following phenomena contributes significantly to the reddish appearance of the sun at sunrise or sunset?

a)

Dispersion of light

b)

Scattering of light

c)

Total internal reflection of light

d)

Reflection of light from the earth

View Answer

10.

The air layer of atmosphere whose temperature is less then the hot layer behave as optically

a)

denser medium

b)

rarer medium

c)

inactive medium

d)

either denser or rarer medium

11.

The deflection of light by minute particles and molecules of the atmosphere in all direction is called ____________ of light.

a)

scattering

b)

interference

c)

tyndell effect

d)

Reflection

12.

One cannot see through the fog, because

a)

refractive index of the fog is very high

b)

fog absorbs light

c)

light is scattered by the droplets

d)

light suffers total reflection at droplets

13.

Assertion: Planets do not twinkle

Reason: Light rays do not come from planet

a)

Assertion and reason are true. Reason is the correct explanation of Assertion

b)

Assertion and reason are false

c)

Assertion is false, but reason is true

d)

Assertion is true, but reason is false

14.

Assertion(A) : The phenomenon of scattering of light by the colloidal particles gives rise to Tyndall effect.

Reason (R): The colour of the scattered light depends on the size of the scattering particles.

a)

Both A and R are true and R is the correct explanation of A.

b)

Both A and R are true but R is not the correct explanation of A.

c)

A is true but R is false.

d)

A is false but R is true.

15.

Assertion(A) : A rainbow is sometimes seen in the sky in rainy season only when observer’s back is towards the Sun.

Reason (R) : Internal reflection in the water droplets cause dispersion and the final rays are in backward direction.

a)

Both A and R are true and R is the correct explanation of A.

b)

Both A and R are true but R is not the correct explanation of A.

c)

A is true but R is false.

d)

A is false but R is true.

16.

Which of the following is the best example of white light?

a)

Danger signals

b)

laser light

c)

sun light

d)

sodium lamp

17.

When white light enters a prism, it gets split into its constituent colours. This is due to

a)

different refractive index for different wavelength of each colour

b)

each colours has same velocity in the prism.

c)

prism material have high density.

d)

Scattering of light

18.

What is the time difference between actual sunset and apparent sunset ?

a)

2 seconds

b)

20 seconds

c)

2 minutes

d)

20 minutes

19.

IN CASE OF TOTAL INTERNAL REFLECTION LIGHT GOES FROM

a)

RARER TO DENSER MEDIUM

b)

DENSER TO RARER MEDIUM

c)

ONE MEDIUM TO ANOTHER HAVING SAME REFRACTIVE INDEX

d)

NONE OF THESE

20.

IN CASE OF TOTAL INTERNAL REFLECTION, ANGLE OF REFRACTION FOR CRITICAL ANGLE IS

a)

900

b)

00

c)

450

d)

DEPENDS ON THE MEDIUM

21.

SKY APPEARS —————- TO AN ASTRONAUT WHEN HE IS ON EARTH

a)

BLUE

b)

BLACK

c)

DARK

d)

VIOLET

22.

REFRACTION OF LIGHT TAKES PLACE IN GLASS SLAB

a)

2 TIMES

b)

ONCE ONLY

c)

3 TIMES

d)

4 TIMES

23.

The flickering of an object through turbulent stream of hot air rising above holi fire is seen because of the phenomenon of

a)

Reflection

b)

Dispersion

c)

Refraction

d)

Atmospheric Refraction

24.

Assertion: Refractive index of prism is different for different colors

Reason: The color that has higher speed deviates less and the color that has lesser speed deviates more.

a)

Assertion is true, Reason is true. Reason is a correct explanation for Assertion

b)

Assertion is true, Reason is true. Reason is not a correct explanation for Assertion

c)

Assertion is true, Reason is false

d)

Assertion is false, Reason is true

25.

THE ANGLE OF DEVIATION OF THE PRISM LIES

a)

OUTSIDE THE PRISM

b)

WITHIN THE PRISM

c)

ON THE PRISM

d)

BEHIND THE PRISM

26.

∠D\angle D  is called as

a)

Angle of incidence

b)

Angle of deviation

c)

Angle of dispersion

d)

Angle of refraction

27.

When white light passes through a prism,

a)

red bends more, violet bends least

b)

red bends least, violet bends most

c)

dispersion doesn't occur

d)

refraction doesn't occur

28.

The splitting of white light into the seven colors when it passes through a transparent material is called

a)

Refractrion

b)

Dispersion

c)

Reflection

d)

Diffraction

29.

A ray of white light enters the raindrop and undergoes __________ and __________ to form a rainbow.

a)

dispersion and internal reflection.

b)

reflection; dispersion

c)

dispersion; diffraction

d)

scattering; dispersion

30.

Red light has

a)

longer wavelength

b)

shorter wavelength

c)

longer frequency

d)

none of the above

31.

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 absorbed the most by smoke or fog

c)

is scattered the least by smoke or fog

d)

moves fastest in air

32.

Which of the following is a natural phenomenon which is caused by the dispersion of sunlight in the sky?

a)

Rainbow

b)

Twinkling of stars

c)

Advanced sunrise and delayed sunset

d)

Stars seem higher than they actually are

33.

When white light enters a prism, it gets split into its constituent colours. This is due to

a)

different refractive index for different wavelength of each colour

b)

each colours has same velocity in the prism.

c)

prism material have high density.

d)

Scattering of light

34.

The air layer of atmosphere whose temperature is less then the hot layer behave as optically

a)

denser medium

b)

rarer medium

c)

inactive medium

d)

either denser or rarer medium

35.

The deflection of light by minute particles and molecules of the atmosphere in all direction is called ____________ of light.

a)

scattering

b)

interference

c)

tyndell effect

d)

Reflection

36.

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

37.

Scattering of light by colloidal solution is known as

a)

Scattering

b)

Dispersion

c)

Tyndall effect

d)

Stability

38.

Color which is having maximum angle of deviation is

a)

Red

b)

Violet

c)

Green

d)

Yellow

39.

IN CASE OF TOTAL INTERNAL REFLECTION LIGHT GOES FROM

a)

RARER TO DENSER MEDIUM

b)

DENSER TO RARER MEDIUM

c)

ONE MEDIUM TO ANOTHER HAVING SAME REFRACTIVE INDEX

d)

NONE OF THESE

40.

PHENOMENON RESPONSIBLE FOR FORMATION OF RAINBOW

a)

REFRACTION

b)

DISPERSION

c)

TOTAL INTERNAL REFLECTION

d)

ALL THE ABOVE

41.

STARS TWINKLE BCOZ OF

a)

DISPERSION

b)

ATMOSPHERE REFRACTION

c)

REFLECTION

d)

SCATTERING

42.

SKY APPEARS —————- TO AN ASTRONAUT WHEN HE IS ON EARTH

a)

BLUE

b)

BLACK

c)

DARK

d)

VIOLET

43.

PHENOMENON OF SPLITTING OF WHITE LIGHT INTO ITS SEVEN CONSTITUENT COLOURS IS KNOWN AS

a)

SCATTERING

b)

DIFFRACTION

c)

DISPERSION

d)

REFRACTION

44.

IN CASE OF PRISM ANGLE OF DEVIATION DEPENDS ON

a)

WAVELENGTH

b)

REFRACTIVE INDEX

c)

ANGLE OF INCIDENCE

d)

ALL THE ABOVE

45.

Colour of the sun at sunrise and sunset

(a)  

46.

When a white light falls on a triangular prism, the colour of light which will deviate the least is

a)

violet

b)

green

c)

blue

d)

red

47.

Which of the following is the best example of white light?

a)

Danger signals

b)

laser light

c)

sun light

d)

sodium lamp

48.

Angle of the prism is (a)   degree

49.

The perpendicular line drawn from the surface of any surface is called as

a)

Normal

b)

Incident Ray

c)

Refracted ray

d)

Emergent ray

50.

Statement: Blue light scatters more than red light during

a)

day time

b)

night time

c)

twilight

d)

none of the above

51.

Refraction of light by the earth’s atmosphere due to variation in air density is called

a)

atmospheric reflection

b)

atmospheric dispersion

c)

atmospheric scattering

d)

atmospheric refraction

52.

Which of the following phenomena contributes significantly to the reddish appearance of the sun at sunrise or sunset?

a)

Dispersion of light

b)

Scattering of light

c)

Total internal reflection of light

d)

Reflection of light from the earth

View Answer

53.

Assertion: Planets do not twinkle

Reason: Light rays do not come from planet

a)

Assertion and reason are true. Reason is the correct explanation of Assertion

b)

Assertion and reason are false

c)

Assertion is false, but reason is true

d)

Assertion is true, but reason is false

54.

Advanced sunrise and delayed sunset is due to

a)

Scattering of light

b)

Atmospheric refraction

c)

dispersion of light

d)

reflection of light

55.

Assertion: Refractive index of prism is different for different colors

Reason: The color that has higher speed deviates less and the color that has lesser speed deviates more.

a)

Assertion is true, Reason is true. Reason is a correct explanation for Assertion

b)

Assertion is true, Reason is true. Reason is not a correct explanation for Assertion

c)

Assertion is true, Reason is false

d)

Assertion is false, Reason is true

56.

The perpendicular line drawn from the surface of any surface is called as

a)

Normal

b)

Incident Ray

c)

Refracted ray

d)

Emergent ray

57.

∠D\angle D  is called as

a)

Angle of incidence

b)

Angle of deviation

c)

Angle of dispersion

d)

Angle of refraction

58.

When white light passes through a prism,

a)

red bends more, violet bends least

b)

red bends least, violet bends most

c)

dispersion doesn't occur

d)

refraction doesn't occur

59.

Sunlight is white, it contains all the colors of the (a)   .

60.

The splitting of white light into the seven colors when it passes through a transparent material is called

a)

Refractrion

b)

Dispersion

c)

Reflection

d)

Diffraction

61.

A ray of white light enters the raindrop and undergoes __________ and __________ to form a spectrum.

a)

refraction; dispersion

b)

reflection; dispersion

c)

dispersion; diffraction

d)

scattering; dispersion

62.

The refraction of light passed by the Earth’s Atmosphere having air layers of varying __________ is called atmospheric refraction.

a)

optical densities

b)

densities

c)

volumes of air

d)

winds

63.

Stars are (a)   sources.

64.

Planets are (a)   sources

65.

The scattering of a beam of light is called

(a)  

66.

Statement: Blue light scatters more than red light during

a)

day time

b)

night time

c)

twilight

d)

none of the above

67.

Red light has

a)

longer wavelength

b)

shorter wavelength

c)

longer frequency

d)

none of the above

68.

When white light passes through a prism,

a)

red bends more, violet bends least

b)

red bends least, violet bends most

c)

dispersion doesn't occur

d)

refraction doesn't occur

69.

The splitting of white light into the seven colors when it passes through a transparent material is called

a)

Refractrion

b)

Dispersion

c)

Reflection

d)

Diffraction

70.

A ray of white light enters the raindrop and undergoes __________ and __________ to form a spectrum.

a)

refraction; dispersion

b)

reflection; dispersion

c)

dispersion; diffraction

d)

scattering; dispersion

71.

The refraction of light passed by the Earth’s Atmosphere having air layers of varying __________ is called atmospheric refraction.

a)

optical densities

b)

densities

c)

volumes of air

d)

winds

72.

Red light has

a)

longer wavelength

b)

shorter wavelength

c)

longer frequency

d)

none of the above

73.

When white light enters a prism, it gets split into its constituent colours. This is due to

a)

different refractive index for different wavelength of each colour

b)

each colours has same velocity in the prism.

c)

prism material have high density.

d)

Scattering of light

74.

The air layer of atmosphere whose temperature is less then the hot layer behave as optically

a)

denser medium

b)

rarer medium

c)

inactive medium

d)

either denser or rarer medium

75.

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)

moves fastest in air

b)

is absorbed the most by smoke or fog

c)

is scattered the least by smoke or fog

d)

is scattered the most by smoke or fog

76.
What is happening in this picture?
a)
The water is making the pencil bigger
b)
the water is refracting (bending) the pencil
c)
the water is refracting (bending) the light to make the pencil look bent
d)
light is being absorbed
77.

The deflection of light by minute particles and molecules of the atmosphere in all direction is called ____________ of light.

a)

scattering

b)

interference

c)

tyndell effect

d)

Reflection

78.

At noon the sun appears white as [NCERT Exemplar Problems]

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

79.

Scattering of light by colloidal solution is known as

a)

Scattering

b)

Dispersion

c)

Tyndall effect

d)

Stability

80.

The colored light that refracts most while passing through a prism is

a)

Red

b)

Yellow

c)

Blue

d)

Violet

81.

Refraction of light by the earth’s atmosphere due to variation in air density is called

a)

atmospheric reflection

b)

atmospheric dispersion

c)

atmospheric scattering

d)

atmospheric refraction

82.

One cannot see through the fog, because

a)

refractive index of the fog is very high

b)

fog absorbs light

c)

light is scattered by the droplets

d)

light suffers total reflection at droplets

83.

Which of the following phenomena contributes significantly to the reddish appearance of the sun at sunrise or sunset?

a)

Dispersion of light

b)

Scattering of light

c)

Total internal reflection of light

d)

Reflection of light from the earth

View Answer

84.

Assertion: Planets do not twinkle

Reason: Light rays do not come from planet

a)

Assertion and reason are true. Reason is the correct explanation of Assertion

b)

Assertion and reason are false

c)

Assertion is false, but reason is true

d)

Assertion is true, but reason is false

85.

∠D\angle D  is called as

a)

Angle of incidence

b)

Angle of deviation

c)

Angle of dispersion

d)

Angle of refraction

86.

Assertion(A) : The phenomenon of scattering of light by the colloidal particles gives rise to Tyndall effect.

Reason (R): The colour of the scattered light depends on the size of the scattering particles.

a)

Both A and R are true and R is the correct explanation of A.

b)

Both A and R are true but R is not the correct explanation of A.

c)

A is true but R is false.

d)

A is false but R is true.

87.

Assertion(A) : A rainbow is sometimes seen in the sky in rainy season only when observer’s back is towards the Sun.

Reason (R) : Internal reflection in the water droplets cause dispersion and the final rays are in backward direction.

a)

Both A and R are true and R is the correct explanation of A.

b)

Both A and R are true but R is not the correct explanation of A.

c)

A is true but R is false.

d)

A is false but R is true.

88.

The perpendicular line drawn from the surface of any surface is called as

a)

Normal

b)

Incident Ray

c)

Refracted ray

d)

Emergent ray

89.

∠D\angle D  is called as

a)

Angle of incidence

b)

Angle of deviation

c)

Angle of dispersion

d)

Angle of refraction

90.

When white light passes through a prism,

a)

red bends more, violet bends least

b)

red bends least, violet bends most

c)

dispersion doesn't occur

d)

refraction doesn't occur

91.

The splitting of white light into the seven colors when it passes through a transparent material is called

a)

Refractrion

b)

Dispersion

c)

Reflection

d)

Diffraction

92.

A ray of white light enters the raindrop and undergoes __________ and __________ to form a spectrum.

a)

refraction; dispersion

b)

reflection; dispersion

c)

dispersion; diffraction

d)

scattering; dispersion

93.

The refraction of light passed by the Earth’s Atmosphere having air layers of varying __________ is called atmospheric refraction.

a)

optical densities

b)

densities

c)

volumes of air

d)

winds

94.

The muscular diaphragm that controls the size of the pupil is

a)

cornea

b)

ciliary muscles

c)

iris

d)

retina

95.

Having two eyes facilitates in

A : Increasing the field of view

B : Bringing three-dimensional view

C : Developing the concept of distance/ size

Then the correct option is/are

a)

A only

b)

A and B only

c)

B only

d)

A, B and C

96.

The black opening between the aqueous humour and the lens is called

a)

retina

b)

iris

c)

cornea

d)

pupil

97.

Near and far points of a young person normal eye respectively are

a)

0 and infinity

b)

0 and 25 cm

c)

25 cm and infinity

d)

25 cm and 150 cm.

98.

The defect of vision in which the person is able to see distant object distinctly but cannot see nearby objects clearly is called

a)

Long-sightedness

b)

Far-sightedness

c)

Hypermetropia

d)

All above

99.

The ability of eye lens to adjust its focal length to form a sharp image of the object at varying distances on the retina is called

a)

Power of observation of the eye

b)

Power of adjustment of the eye

c)

Power of accommodation of the eye

d)

Power of enabling of the eye

100.

The image formed by retina of human eye is

a)

Real and inverted

b)

Virtual and inverted

c)

Virtual and erect

d)

Real and erect

101.

When white light enters a prism, it gets split into its constituent colours. This is due to

a)

different refractive index for different wavelength of each colour

b)

each colours has same velocity in the prism.

c)

prism material have high density.

d)

Scattering of light

102.

The air layer of atmosphere whose temperature is less then the hot layer behave as optically

a)

denser medium

b)

rarer medium

c)

inactive medium

d)

either denser or rarer medium

103.

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)

moves fastest in air

b)

is absorbed the most by smoke or fog

c)

is scattered the least by smoke or fog

d)

is scattered the most by smoke or fog

104.
What is happening in this picture?
a)
The water is making the pencil bigger
b)
the water is refracting (bending) the pencil
c)
the water is refracting (bending) the light to make the pencil look bent
d)
light is being absorbed
105.
Which of the following is the correct order in which light travels through the eye?  
a)
Cornea, Lens, Retina, Pupil, Optic Nerve
b)
Pupil, Cornea, Lens, Retina, Optic Nerve
c)
Cornea, Retina, Lens, Pupil, Optic Nerve
d)
Cornea, Pupil, Lens, Retina, Optic Nerve
106.

Which eye disease has blurred images and clouding of the lens?

a)

Myopia

b)

Pink Eye

c)

Cataracts

d)

Hypermyopia

107.

Bi-focal lens are required to correct

a)

presbyopia

b)

astigmatism

c)

coma

d)

myopia

108.

An image is formed on

a)

Iris

b)

Pupil

c)

Retina

d)

Cornea

109.

Light enters the eye through a thin membrane called the

a)

Iris

b)

Pupil

c)

Retina

d)

Cornea

110.

The shape of eye-ball is nearly _________________

a)

Elliptical

b)

Oval

c)

Circular

d)

Spherical

111.

Following controls and regulates the amount of light entering the eye

a)

Iris

b)

Pupil

c)

Retina

d)

Corena

112.

_________________ send signals to the brain

a)

Optical nerve

b)

Aqueous Humour

c)

Viterous humour

d)

Eye lens

113.

When the light is very bright, the diameter of pupil

a)

Expends

b)

Contract

c)

Remain same

d)

All of these

114.

When an object is placed closer to eye ____________

a)

the ciliary muscles contract

b)

curvature of the eye lens increases

c)

Eye lens become thicker

d)

All of the above

115.

To see an object comfortably and distinctly, we must hold it about _______ cm from our eyes.

a)

10

b)

25

c)

15

d)

infinity

116.

The ability of the eye lens to adjust its focal length is called

a)

Accommodation

b)

Accomplish

c)

Composition

d)

None of the above

117.

The farthest point upto which the eye can see objects clearly is ____________ for a normal eye.

a)

25 cm

b)

15 cm

c)

infinity

d)

1 km

118.

Following is far-sightedness

a)

Myopia

b)

Hypermetropia

c)

Presbyopia

d)

All of the above

119.

The person who is suffering from the following disease cannot donate eyes.

a)

diabetes

b)

asthma

c)

hypertension

d)

tetanus

120.

The person who is suffering from _____________ requires bi-focal lens.

a)

(a) Hypermetropia

b)

(b) Myopia

c)

both option(a) and (b)

d)

none of these

121.

Following is true for Hypermetropia

a)

It can be corrected by using a convex lens

b)

It may arise when focal length of eye lens is too long

c)

it may arise when eyeball has become too small

d)

all of above

122.

Having two eyes facilitates in

A: Increasing the field of view

B: Bringing three-dimensional view

C: Developing the concept of distance/size

Then the correct option is/are

a)

A only

b)

A and B only

c)

B only

d)

A,B and C

123.

the black opening between the aqueous humour and the lens is called

a)

retina

b)

iris

c)

cornea

d)

pupil

124.

The defect of vision in which the person is able to see distant object distinctly but cannot see nearby objects clearly is called

a)

far-sightedness

b)

near-sightedness

c)

presbyopia

d)

All of above

125.

Myopia and Hypermetropia can be corrected by

a)

Concave and plano-convex lens

b)

Concave and convex lens

c)

Convex and concave lens

d)

Plano-concave lens for both defects.

126.

The image formed on the retina of the human eye is

a)

virtual and inverted

b)

real and inverted

c)

virtual and erect

d)

real and erect

127.

When the light rays enters the eye, most of the refraction occurs at the

a)

crystalline lens

b)

outer surface of cornea

c)

iris

d)

pupil

128.

The muscular diaphragm that controls the size of the pupil is

a)

Cornea

b)

Ciliary muscles

c)

Iris

d)

Retina

129.

The image formed on the retina of the human eye is

a)

virtual and erect

b)

real and erect

c)

real and inverted

d)

virtual and inverted

130.

When white light enters a prism, it gets split into its constituent colours. This is due to

a)

different refractive index for different wavelength of each colour

b)

each colours has same velocity in the prism.

c)

prism material have high density.

d)

Scattering of light

131.

The air layer of atmosphere whose temperature is less then the hot layer behave as optically

a)

denser medium

b)

rarer medium

c)

inactive medium

d)

either denser or rarer medium

132.

The deflection of light by minute particles and molecules of the atmosphere in all direction is called ____________ of light.

a)

scattering

b)

interference

c)

tyndell effect

d)

Reflection

133.

At noon the sun appears white as [NCERT Exemplar Problems]

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

134.

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)

moves fastest in air

b)

is absorbed the most by smoke or fog

c)

is scattered the least by smoke or fog

d)

is scattered the most by smoke or fog

135.

When light rays enter the eye, most of the refraction occurs at the

a)

Pupil

b)

Iris

c)

outer surface of the cornea

d)

crystalline lens

136.

In human eye,image is formed on

a)

Iris

b)

Cornea

c)

Retina

d)

Lens

137.

Scattering of light by colloidal solution is known as

a)

Scattering

b)

Dispersion

c)

Tyndall effect

d)

Stability

138.

When white light enters a prism, it gets split into its constituent colours. This is due to

a)

different refractive index for different wavelength of each colour

b)

each colours has same velocity in the prism.

c)

prism material have high density.

d)

Scattering of light

139.

The deflection of light by minute particles and molecules of the atmosphere in all direction is called ____________ of light.

a)

scattering

b)

interference

c)

tyndell effect

d)

Reflection

140.

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)

moves fastest in air

b)

is absorbed the most by smoke or fog

c)

is scattered the least by smoke or fog

d)

is scattered the most by smoke or fog

141.

When a white light falls on a triangular prism, the colour of light which will deviate the least is

a)

violet

b)

green

c)

blue

d)

red

142.

Advanced sunrise and delayed sunset is due to

a)

Scattering of light

b)

Atmospheric refraction

c)

dispersion of light

d)

reflection of light

143.
Why does the lower part of the child appear so much different in size from the upper part?
a)
The light rays that travel through water and then into air are refracted.
b)
The light rays that travel through water and then into air are enlarged.
c)
The light rays that travel through air and then into water are reflected.
d)
The light rays that travel through air and then into water are reduced.
144.

What is the time difference between actual sunset and apparent sunset ?

a)

2 seconds

b)

20 seconds

c)

2 minutes

d)

20 minutes

145.

Which of the following is a natural phenomenon which is caused by the dispersion of sunlight in the sky?

a)

Rainbow

b)

Twinkling of stars

c)

Advanced sunrise and delayed sunset

d)

Stars seem higher than they actually are

146.

When white light passes through a prism,

a)

red bends more, violet bends least

b)

red bends least, violet bends most

c)

dispersion doesn't occur

d)

refraction doesn't occur

147.

The splitting of white light into the seven colors when it passes through a transparent material is called

a)

Refractrion

b)

Dispersion

c)

Reflection

d)

Diffraction

148.
What is happening in this picture?
a)
The water is making the pencil bigger
b)
the water is refracting (bending) the pencil
c)
the water is refracting (bending) the light to make the pencil look bent
d)
light is being absorbed
149.

Phenomenon of ............ happens in eyes.

a)

Reflection

b)

Refraction

c)

None of above

d)

Data Missing

150.
What gives the biggest part of the eye its shape?
a)
vitreous body
b)
rods
c)
pupil
d)
lens
151.

To correct fuzzy vision, many people use to wear:

a)

hats

b)

goggles

c)

glasses

d)

binoculars

152.
Which part of your eye would you consider to be the "great messanger"?
a)
retina
b)
optic nerve
c)
sclera
d)
blood vessels
153.
When an image hits the retina it is upside down. What flips it over so that it is right side up?
a)
lens
b)
retina
c)
optic nerve
d)
brain
154.
Which part is the colorful part of the eye?
a)
pupil
b)
iris
c)
cornea
d)
eyeball
155.

Which would you rather walk on barefoot if the sun is out all day long?

a)

grass

b)

black top

c)

sand at the beach

d)

concrete sidewalk

156.

When light hits an area and bounces back it is called:

a)

echo

b)

refraction

c)

reflection

d)

absorbing

157.

When light goes from one material(medium) to another it becomes bent, what term means bent?

a)

reflected

b)

refracted

c)

absorbed

d)

turned

158.

Why does the straw appear to be bent?

a)

light is reflected

b)

light is absorbed

c)

light is turned

d)

light is refracted

159.

When light passes from air to water, what does happen to the speed of the light?

a)

speeds up

b)

slows down

c)

stays the same

160.
Light has the lowest velocity in which medium?
flint glass n=1.70
barium glass n=1.60
crown glass n=1.523
water n=1.33
diamond n=2.45
a)
diamond
b)
water
c)
flint glass
d)
barium glass
161.
The point where the rays meet is known as....
a)
Fire
b)
the focal point
c)
refraction
d)
Plane of the lens
162.

............. is used to separate white light into colors.

a)

prism

b)

reflection

c)

sunlight

d)

spectrum

163.
What do water droplets in a rainbow act like?
a)
reflectors
b)
rays of light
c)
lasers
d)
prisms
164.
By passing light through a prism, you can tell ____________.
a)
that white light is made of different colors
b)
the weight of the prism
c)
the original source of light
d)
that blue light is brighter than white light
165.
What is the correct order of the colors of the rainbow?
a)
Red, Yellow, Orange, Blue, Indigo, Violet
b)
Red, Orange, Yellow, Green, Blue, Indigo, Violet
c)
Yellow, Orange, Red, Green, Blue, Violet, Indigo
166.

Materials that allow light to pass through them clearly are called transparent. Which of the following material is NOT transparent?

a)

window glass

b)

clean air

c)

a mirror

d)

water

167.

Which of following is an example of a translucent object?

a)

glass

b)

book

c)

opaque

d)

waxed paper

168.
Brightness of light is related to the amount of light being seen. The closer in distance to the source of light, the _________ the light appears.
a)
dimmer
b)
wavier
c)
darker
d)
brighter

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