Human Eye and Colourful World Test

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Human Eye and Colourful World Test - 21

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Weekly Quiz Competition

Question 1
1 / -0

The eye consists of a screen called ______ on which the light rays are focused.

A
Retina

B
Iris

C
Pupil

D
None of these

Solution

The eye consists of a screen called retina on which the light rays are focussed and an image is formed. Thus, option $$A$$ is correct.
Question 2
1 / -0

Cornea is a transparent spherical structure which :

A
Reflects light

B
Scatters light

C
Refracts light

D
None of these

Solution

The cornea is the transparent front part of the eye that covers the iris, pupil and anterior chamber. The cornea, with the anterior chamber and lens, refracts light, with the cornea accounting for approximately two-thirds of the eye's total optical power. Thus, option $$C$$ is correct.
Question 3
1 / -0

Our eye lens is held in position by :

A
Rods and cones

B
Iris and pupil

C
Ciliary muscles

D
None of these

Solution

The ciliary muscle is found in the middle layer of eye. It helps to change the shape of the lens within the eye and holds it in position. Thus, option $$C$$ is correct
Question 4
1 / -0

Blue colour of sky is due to:

A
scattering.

B
absorption.

C
reflection.

D
refraction.

Solution

Blue light is scattered the most. Hence, as sunlight travels the earth, most of the blue colour is scattered and hence spread. This causes the sky to appear blue in the day.
Question 5
1 / -0

A parallel beam of light falling on the eye gets focused on the retina because of refractions at :

A
the cornea

B
the crystalline lens

C
the vitreous humor

D
various surfaces in the eye

Solution

A parallel beam of light falling on the eye gets focused on the retina because of refractions at the crystalline lens. However, most of the refraction for the light rays entering the eye occurs at the outer surface of the cornea. The crystalline lens provides the finer adjustment of the focal length required to focus objects at different distances on the retina.

So we can say that the focusing of the image exactly on the retina is mainly due to the refraction at the crystalline lens.
Question 6
1 / -0

Image on the retina remains for:

A
20 s

B
10 s

C
$$\dfrac {1}{100}s$$

D
$$\dfrac {1}{16}s$$

Solution

Image on the retina remains for $$\dfrac{1}{16} \ sec$$, thus option $$D$$ is correct.
Question 7
1 / -0

Change in focal length of an eye-lens to focus the image of the object at varying distances is done by the action of:

A
Pupil

B
Ciliary muscles

C
Retina

D
Blind spot

Solution

The ciliary muscles change the focal length of the eye lens to focus objects at variable distances.
Question 8
1 / -0

A series of fast-moving still pictures can create an illusion of movement because:

A
The eye can focus on very rapidly changing pictures

B
The eye is quicker than the brain

C
The eye can separate two images only when the interval of separation between them is one-sixteenth of a second

D
The optical cortex can see through the rapidly moving images

Solution

The impression of an image does not vanish immediately from the retina. It persists there for about one-sixteenth of a second. So, if still images of a moving object are flashed on the eye at a rate faster than 16 per second, then the eye perceives this object as moving.
Question 9
1 / -0

Fill in the blank spaces by choosing the correct words from the list given below:
List : yellow spot, principal focus, less, shutter, more.
The small but very light sensitive area on the retina is called __________.

A
yellow spot

B
principal focus

C
shutter

D
none of the above

Solution

Yellow spot
Yellow spot is near the center of the retina and a highly pigmented area which is very sensitive to light.
Question 10
1 / -0

Name the colour of white light which is deviated the least, on passing through a prism.

A
Red

B
Violet

C
Blue

D
Orange

Solution

Red light has the minimum refractive index and maximum speed when travelling through a medium since it has the longest wavelength. Thus, it bends least upon incidence and has minimum deviation for the incident ray.

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Re-Attempt Weekly Quiz Competition

Human Eye and Colourful World Test - 21

Result

Human Eye and Colourful World Test - 21

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SHARING IS CARING

Question 1

Retina

Iris

Pupil

None of these

Solution

Question 2

Reflects light

Scatters light

Refracts light

None of these

Solution

Question 3

Rods and cones

Iris and pupil

Ciliary muscles

None of these

Solution

Question 4

scattering.

absorption.

reflection.

refraction.

Solution

Question 5

the cornea

the crystalline lens

the vitreous humor

various surfaces in the eye

Solution

Question 6

20 s

10 s

$$\dfrac {1}{100}s$$

$$\dfrac {1}{16}s$$

Solution

Question 7

Pupil

Ciliary muscles

Retina

Blind spot

Solution

Question 8

The eye can focus on very rapidly changing pictures

The eye is quicker than the brain

The eye can separate two images only when the interval of separation between them is one-sixteenth of a second

The optical cortex can see through the rapidly moving images

Solution

Question 9

yellow spot

principal focus

shutter

none of the above

Solution

Question 10

Red

Violet

Blue

Orange

Solution

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