Human Eye and Colourful World Test

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Human Eye and Colourful World Test - 33

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Weekly Quiz Competition

Question 1
1 / -0

When objects at different distance are seen by the eye, which of the following remain constant?

A
The focal length of the eye-lens.

B
The object- distance from the eye-lens.

C
The radii of curvature of the eye-lens.

D
The image-distance from the eye-lens.

Solution

The image distance from the eye-lens remains the same as it is always formed on the retina. Thus, option $$D$$ is correct.
Question 2
1 / -0

The distance of the eye-lens from the retina is $$x$$. For a normal eye, the maximum focal length of the eye-lens

A
$$= x$$

B
$$< x$$

C
$$> x$$

D
$$= 2x$$

Solution

Focal length of normal eye lens is equal to the distance between eye-lens and retina i.e, $$x$$ so that all rays converges on retina after passing through eye-lens, thus option $$A$$ is correct.
Question 3
1 / -0

The eye forms a real and inverted image of an object on the retina. If the eye lens is defective, the image of objects may be formed in front of or behind the retina. Persons in whom the image is formed in front of the retina are not able to see the distant objects clearly while if the image is formed behind the retina the person is not able to see a near object clearly. The latter kind of people is said to be longsighted.
Persons suffering from myopia cannot see clearly the

A
Distant objects

B
Near objects

C
Spherical objects

D
Neither near nor distant

Solution

Persons suffering from myopia cannot see distant objects.
Nearsightedness (myopia) is a common vision condition in which you can see objects near to you clearly, but objects farther away are blurry. It occurs when the shape of your eye causes light rays to bend (refract) incorrectly, focusing images in front of your retina instead of on your retina.
Question 4
1 / -0

A person A can clearly see object between 25 cm and 200 cm. Which of the following may represent the range of clear vision for a person B having muscles stronger than A, but all other parameter of eye identical to that of A?

A
25 cm to 200 cm

B
18 cm to 200 cm

C
25 cm to 300 cm

D
18 cm to 300 cm

Solution

Stronger muscles would allow the person to contract the lens more than a normal person, increasing the radius of curvature.
This would increase the focus of the convex lens, and the person would be able to see closer objects more clearly.
However when looking at the far objects, the person B can do nothing more than person A to relax the muscles and decrease the focal length , hence the most distant object visible for both of them would be same.
Question 5
1 / -0

What characteristic property of light is responsible for the blue colour of the sky?

A
Interference

B
Diffraction

C
Scattering

D
Dispersion

Solution

A clear cloudless day-time sky is blue because molecules in the air scatter blue light from the sun more than they scatter red light. When we look towards the sun at sunset, we see red and orange colors because the blue light has been scattered out and away from the line of sight.
Hence, scattering is the characteristic property of light which is responsible for the blue colour of the sky.
Question 6
1 / -0

Fill in the blank spaces by choosing the correct word.
A prism is a piece of transparent material having three rectangular surfaces and .......... triangular surfaces.

A
$$three$$

B
$$two$$

C
$$four$$

D
$$one$$

Solution

A prism is a piece of transparent material bounded by three rectangular surfaces forming a triangle. The opaque surface is called the base. The other two surfaces are transparent and are called refracting surfaces. The angle between the two refracting surfaces is called the angle of the prism.
Hence, a prism is a piece of transparent material having three rectangular surfaces and two triangular surfaces.
Question 7
1 / -0

During dispersion of white light by a prism, the red colour deviates :

A
most

B
least

C
normally

D
can't say

Solution

As seen in diagram red deviates the least.
During dispersion of white light by a prism, different colors travel with different speed hence they split in prism.Red travels the faster while violet travels slowest so Red is on top and violet is at bottom.
Question 8
1 / -0

An astronaut in a spaceship the sky appears black due to:

A
Absence of atmosphere in his neighbourhood

B
Light from the sky is absorbed by the medium surrounding him

C
The fact at the height, sky radiations are only in the infra-red and the ultraviolet region

D
None of these

Solution

To an astronaut it will appear as black.On earth we see the blue sky due to presence of atmosphere. Atmosphere refracts light ray coming from the sun and we see the colour of sky.In space, due to the absence of the atmosphere the light rays do not refract and reach the astronomer's eyes therefore it appears black.
Question 9
1 / -0

The power of spectacle for myopic eye is :

A
negative

B
positive

C
both positive and negative

D
none of the above

Solution

The power of spectacle for myopic eye is negative as concave lens is used for correction.
Question 10
1 / -0

The image of an object is formed behind __________ in hypermetropia.

A
retina

B
cornea

C
rods

D
none of the above

Solution

Hypermetropia is a defect in the vision of some people which is caused due to flattening of the eyeball.
The retina is a part of the eyeball on the back side. It behaves like a screen on which the image of the object we are viewing is formed.
In hypermetropia, the eyeball comes closer than where it is supposed to be. Hence the image is formed behind the retina.

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Re-Attempt Weekly Quiz Competition

Human Eye and Colourful World Test - 33

Result

Human Eye and Colourful World Test - 33

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SHARING IS CARING

Question 1

The focal length of the eye-lens.

The object- distance from the eye-lens.

The radii of curvature of the eye-lens.

The image-distance from the eye-lens.

Solution

Question 2

$$= x$$

$$< x$$

$$> x$$

$$= 2x$$

Solution

Question 3

Distant objects

Near objects

Spherical objects

Neither near nor distant

Solution

Question 4

25 cm to 200 cm

18 cm to 200 cm

25 cm to 300 cm

18 cm to 300 cm

Solution

Question 5

Interference

Diffraction

Scattering

Dispersion

Solution

Question 6

$$three$$

$$two$$

$$four$$

$$one$$

Solution

Question 7

most

least

normally

can't say

Solution

Question 8

Absence of atmosphere in his neighbourhood

Light from the sky is absorbed by the medium surrounding him

The fact at the height, sky radiations are only in the infra-red and the ultraviolet region

None of these

Solution

Question 9

negative

positive

both positive and negative

none of the above

Solution

Question 10

retina

cornea

rods

none of the above

Solution

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