Human Eye and Colourful World Test

Result

Human Eye and Colourful World Test - 20

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Weekly Quiz Competition

Question 1
1 / -0

How are we able to see both the nearby and the distant objects clearly?

A
By changing the focal length of the eye lens.

B
By changing the size of the eye lens.

C
By changing the power of the eye lens.

D
None of these.

Solution

Human eye is able to see nearby and distant objects clearly by changing the focal length of the eye lens, This availability of eyes is called power of accommodation. Thus, option $$A$$ is correct.
Question 2
1 / -0

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

A
Crystalline lens

B
Outer surface of the cornea

C
Iris

D
Pupil

Solution

Cornea is the transparent spherical part of the eye covering the iris and pupil. When an object appears in front of the eye, the rays from the object enter through this transparent cornea and refraction occurs at the outer surface. thus, option $$B$$ is correct.
Question 3
1 / -0

The far point of a myopic eye is 250 cm. The correcting lens should be a

A
diverging lens of focal length 250 cm

B
converging lens of focal length 250 cm

C
diverging lens of focal length 125 cm

D
converging lens of focal length 125 cm

Solution

$$u = -\infty $$

$$ v = -250 cm$$

$$\dfrac{1}{v}-\dfrac{1}{u}= \dfrac{1}{f}$$

$$(-\dfrac{1}{\infty}-\dfrac{1}{250})= \dfrac{1}{f}$$

$$f= -250cm$$

The correcting lens of focal length $$250 cm$$, since myopic eye is corrected by using a concave lens (which is a diverging lens) of suitable power, thus option $$A$$ is correct.
Question 4
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What are the colours of the Sun observed most during sunrise/sunset and noon?

A
white and red

B
reddish and orange

C
yellow and reddish

D
orange and blue

Solution

During sunrise and sunset the sun rays have to pass through a larger distance and also a greater thickness of air since it is low in the sky. At these positions, the sky looks orange-red colour because photons of red and orange light are least scattered through the atmosphere and are able to reach our eyes.
Question 5
1 / -0

A man cannot see clearly the objects beyond a distance of 20 cm from his eyes. To see distant objects clearly the kind of lenses and its focal length must be

A
100 cm convex

B
100 cm concave

C
20 cm convex

D
20 cm concave

Solution

$$u= +20cm$$

$$v= \infty $$

$$\dfrac{1}{v}-\dfrac{1}{u}= \dfrac{1}{f}$$

$$\dfrac{1}{\infty }-\dfrac{1}{+20}= \dfrac{1}{f}$$

$$f=-20\ cm$$
Question 6
1 / -0

A hollow glass prism gives

A
a dim spectrum

B
bright spectrum

C
no spectrum

D
only continuous spectrum

Solution

A hollow glass prism does not give any spectrum because it does not have any medium inside it is hollow from inside so white light can not split in vacuum because in vacuum all colors light travel with same speed hence they do not split and no spectrum is observed.
Question 7
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In the figure of the human eye, the cornea is represented by the letter :

A
A

B
B

C
C

D
D

Solution

On the front surface of the eye is the circle-shaped cornea. We can't see a person's cornea the way we can see the colored part of the eye behind it. The cornea is like a clear window that focuses light into the eye.
Hence, option C represents cornea.
Question 8
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Eye lens contains a watery liquid called:

A
Aqueous humour

B
Peroxide

C
Vitreous humour

D
None of these

Solution

Eye lens contains a watery liquid called the aqueous humour. Its major functions are immunity, nutrition, maintaining spherical shape and maintaining the required refractive index. Thus, option $$A$$ is correct.
Question 9
1 / -0

Red light is used as danger signal because it is:

A
Accepted as symbol

B
Pleasing to the eye

C
Sensitive to the eye

D
Has high wavelength

Solution

Red light is used as danger signal because it is having high wavelength, less scattering ,hence can travel larger distances.
Question 10
1 / -0

Long-sightedness : Hypermetropia
Short-sightedness :

A
Myopia

B
Focussing

C
Astigmatism

D
Accommodation

Solution

Long sightedness is also known as Hypermetropia and short sightedness is also known as Myopia.

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Re-Attempt Weekly Quiz Competition

Human Eye and Colourful World Test - 20

Result

Human Eye and Colourful World Test - 20

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SHARING IS CARING

Question 1

By changing the focal length of the eye lens.

By changing the size of the eye lens.

By changing the power of the eye lens.

None of these.

Solution

Question 2

Crystalline lens

Outer surface of the cornea

Iris

Pupil

Solution

Question 3

diverging lens of focal length 250 cm

converging lens of focal length 250 cm

diverging lens of focal length 125 cm

converging lens of focal length 125 cm

Solution

Question 4

white and red

reddish and orange

yellow and reddish

orange and blue

Solution

Question 5

100 cm convex

100 cm concave

20 cm convex

20 cm concave

Solution

Question 6

a dim spectrum

bright spectrum

no spectrum

only continuous spectrum

Solution

Question 7

A

B

C

D

Solution

Question 8

Aqueous humour

Peroxide

Vitreous humour

None of these

Solution

Question 9

Accepted as symbol

Pleasing to the eye

Sensitive to the eye

Has high wavelength

Solution

Question 10

Myopia

Focussing

Astigmatism

Accommodation

Solution

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