Human Eye and Colourful World Test

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Human Eye and Colourful World Test - 41

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Weekly Quiz Competition

Question 1
1 / -0

Assertion: The setting sun appears to be red.
Reason: The scattering of light is directly proportional to the wavelength.

A
Both assertion and reason are true but the reason is the correct explanation of the assertion

B
Both assertion and reason are true but the reason is not the correct explanation of the assertion

C
Assertion is true but reason is false

D
Both the assertion and reason are false

E
Reason is true but assertion is false

Solution

The setting sun appears to be red because red light which has the greatest wavelength is least scattered and reaches our eyes the most. Other wavelengths are scattered to the longest extent. The scattering of light is inversely proportional to the wavelength. So, the reason given is wrong.
Question 2
1 / -0

The sun appears red at the time of sun-rise and sun-set. This is because:

A
red colour is least scattered

B
red colour is most scattered

C
the sun is red in colour

D
our eyes can sense only red colour

Solution

Among the constituent colours of white light, red has the longest wavelength and hence least frequency. Scattering is inversely proportional to wavelength .As a result, red is least scattered among all colours. So, red colour reaches our eyes while all other colours scatter away during sun-rise and sun-set.
Question 3
1 / -0

Sky appears to be blue in clear atmosphere due to which property of light.

A
Scattering

B
Polarization

C
Diffraction

D
Dispersion

Solution

A clear cloudless daytime sky is blue because molecules in the air scatter blue light from the sun more than they scatter red light. because blue light has a wavelength that is the same size as the particle in the air.
Question 4
1 / -0

When white light is passed through two consecutive prisms, the resultant will be:

A
rainbow colors

B
white beam

C
no light

D
yellow light

Solution

When white light passes through the first prism, the emergent light disperses into rainbow colours. Then these rays pass through the second prism and combine into white light.
Question 5
1 / -0

The sky appears blue due to:

A
reflection of light

B
dispersion and scattering of light

C
total internal reflection of light

D
blue colour of water droplets
Question 6
1 / -0

Match the items in list-I with items in list-II and collect the correct answers from the codes given below the lists:
List-I List-II
I. Myopia A. Bifocal lens
II. Hyper-metropia B. Cylindrical lens
III. Presbyopia C. Concave lens
IV. Astigmation D. Convex lens

A
I-D, II-C, III-A, IV-B

B
I-C,11-D,III-A, IV-B

C
I-B, II-D, III-A, IV-C

D
I-A, II-B, III-C, IV-D

Solution

Myopia or short sightedness is inability to see distant objects clearly -
It is corrected by Diverging lens (Concave)

Hyper-metropia or long sightedness is inability to see nearby objects clearly- It is corrected by Converging lens (convex)

Presbyopia -Presbyopia is the gradual loss of your eyes' ability (due to aging) to focus on nearby objects- It is corrected by Bifocal lenses

Astigmation -Astigmatism is a type of refractive error in which the eye does not focus light evenly on the retina,It is corrected by - Cylindrical lenses.
thus,
I - C
II - D
III - A
IV - B

Option B is correct.
Question 7
1 / -0

Sodium lamps are used in foggy conditions because:

A
yellow light is scattered less by the fog particles

B
yellow light is scattered more by' the fog particles

C
yellow light is unaffected during its passage through the fog

D
Wavelength of yellow light is the mean of the visible part of the spectrum

Solution

The higher the wavelength the lesser the scattering. Yellow light has higher wavelength so it is least likely to be scattered among all colours in the visible region (except red & orange). So this light is visible from long distance even when there is foggy weather.
Question 8
1 / -0

A defect of vision caused due to excessive curvature of the cornea is:

A
myopia

B
hypermetropia

C
astigmatism

D
presbyopia

Solution

Myopia is an eye defect in which one can see objects near to him clearly, but objects farther away are blurry. Myopia is caused due to excessive curvature of the cornea or more elongation of the eyeball.
Question 9
1 / -0

A person who is near sighted will have the most trouble reading

A
a newspaper in his hands

B
a mobile screen in front of him

C
a street sign across the street

D
the menu in a restaurant

Solution

A near-sighted person is able to see the near objects clearly but is not able to see the objects which are far from the eyes. In this defect, the image of the far object is formed in front of the retina.
Thus, the person will not have any problem reading a newspaper, watching a mobile screen, or reading the menu card in a restaurant. But the person can not see a street sign clearly as it is located far from him.
Question 10
1 / -0

If a person can see an object clearly when it is placed at about $$25 cm$$ away from him, he is suffering from:

A
myopia

B
hypermetropia

C
astigmatism

D
none of these

Solution

Minimum distance at which objects can be seen most distinctly is called the least distance of distinct vision or near point of eye. It is $$25cm$$ for a young adult with normal eye.

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Re-Attempt Weekly Quiz Competition

List-I	List-II
I. Myopia	A. Bifocal lens
II. Hyper-metropia	B. Cylindrical lens
III. Presbyopia	C. Concave lens
IV. Astigmation	D. Convex lens

Human Eye and Colourful World Test - 41

Result

Human Eye and Colourful World Test - 41

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SHARING IS CARING

Question 1

Both assertion and reason are true but the reason is the correct explanation of the assertion

Both assertion and reason are true but the reason is not the correct explanation of the assertion

Assertion is true but reason is false

Both the assertion and reason are false

Reason is true but assertion is false

Solution

Question 2

red colour is least scattered

red colour is most scattered

the sun is red in colour

our eyes can sense only red colour

Solution

Question 3

Scattering

Polarization

Diffraction

Dispersion

Solution

Question 4

rainbow colors

white beam

no light

yellow light

Solution

Question 5

reflection of light

dispersion and scattering of light

total internal reflection of light

blue colour of water droplets

Question 6

I-D, II-C, III-A, IV-B

I-C,11-D,III-A, IV-B

I-B, II-D, III-A, IV-C

I-A, II-B, III-C, IV-D

Solution

Question 7

yellow light is scattered less by the fog particles

yellow light is scattered more by' the fog particles

yellow light is unaffected during its passage through the fog

Wavelength of yellow light is the mean of the visible part of the spectrum

Solution

Question 8

myopia

hypermetropia

astigmatism

presbyopia

Solution

Question 9

a newspaper in his hands

a mobile screen in front of him

a street sign across the street

the menu in a restaurant

Solution

Question 10

myopia

hypermetropia

astigmatism

none of these

Solution

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