Human Eye and Colourful World Test

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Human Eye and Colourful World Test - 34

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Weekly Quiz Competition

Question 1

1 / -0

Match column I with column II and select the correct answer using the codes given below:

	Column I		Column II
(A)	Myopia	(p)	The power of accommodation of the eye decreases with ageing
(B)	Hypermetropia	(q)	The focal length of the eye lens is too long
(C)	Presbyopia	(r)	The focal length of the eye lens is too small
(D)	Astigmatism	(s)	The eyes fail to distinguish horizontal and vertical lines at the same distance

(A) $$\rightarrow$$ r, (B) $$\rightarrow$$ q, (C) $$\rightarrow$$ p, (D) $$\rightarrow$$ s

(A) $$\rightarrow$$ p, (B) $$\rightarrow$$ r, (C) $$\rightarrow$$ s, (D) $$\rightarrow$$ q

(A) $$\rightarrow$$ s, (B) $$\rightarrow$$ p, (C) $$\rightarrow$$ r, (D) $$\rightarrow$$ q

(A) $$\rightarrow$$ q, (B) $$\rightarrow$$ r, (C) $$\rightarrow$$ p, (D) $$\rightarrow$$ s

Solution

Answer is A.

The right matches are given below.
$$A\rightarrow r$$,

Myopia is the defect of human eye in which the focal length of the eye lens is too small.
$$B\rightarrow q$$,

Hypermetropia is the defect of human eye in which the focal length of the eye lens is too long.
$$C\rightarrow p$$,

Presbyopia is the defect of human eye in which the power of accommodation of the eye decreases with ageing.
$$D\rightarrow s$$.

Astigmatism is the defect of human eye in which the eyes fail to distinguish horizontal and vertical lines at the same distance.
Hence, option A is correct.

Question 2
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Given is a diagram showing a defect of human eye.
Study it and answer the following questions :
Name the type of lens used to correct the defect.

A
$$Convex$$

B
$$Concave$$

C
$$Bifocal$$

D
All of the above can be used

Solution

According to the given diagram, the defect is hypermetropia. Hypermetropia means long-sightedness and is caused when the image of a nearby object is formed behind the retina. One needs to use a converging lens to correct this defect.
By placing a convex (plus powered) lens in front of a hypermetropic eye, the image is focused correctly on the retina.
Question 3
1 / -0

Name the defect shown in figure :

A
Myopia

B
Astigmatism

C
Hypermetropia

D
Presbyopia

Solution

$$ \bf{Hypermetropia} $$ or long-sightedness is a defect in the vision, in which the person can see distant objects clearly but cannot see the nearby objects distinctly.
The rays coming from an object placed at normal near point do not meet at the retina but at a point behind the retina.

Hence, the correct answer is OPTION C.
Question 4
1 / -0

Power of accomodation of eye implies:

A
Control intensity

B
Prevent internal reflection of light

C
Change of focal length of eye lens

D
All of the above

Solution

The ability of the eye to adjust its focal length is known as accommodation, the eye accommodates by assuming a lens shape of shorter focal length. Thus, option $$C$$ is correct.
Question 5
1 / -0

The speed of light will be minimum while passing through

A
Glass

B
Air

C
Water

D
Vacuum

Solution
Question 6
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For a normal eye, in case of an adult, the least distance of distinct vision is:

A
5 to 8 cm

B
10 to15 cm

C
20 to 25 cm

D
30 to 35 cm

Solution

The point nearest to the eye at which an object is distinctly visible is called the near point of the eye. The distance of the near point of the eye is called the least distance of distinct vision. It varies with age. For an infant it is 5 to 8 em, for an adult, it is 20 to 25 cm. If the object is held closer to the eye than this distance the image formed will be blurred and fuzzy.
Question 7
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The nature of image formed on the retina of human eye is:

A
Virtual and erect

B
Virtual and inverted

C
Real and erect

D
Real and inverted

Solution

The eye lens forms an inverted real image of the object on the retina.
Question 8
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The splitting of white light into its constituent colours by a triangular prism is called ________ .

A
Dispersion

B
Reflection

C
Refraction

D
Scattering

Solution

The white light is separated into its component colors - red, orange, yellow, green, blue, indigo and violet. The separation of visible light into its different colors is known as dispersion. On passing through the prism, each colour of light ray is refracted by a different amount and hence, white light is split into its component colours.
Question 9
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Blue colour of sky is due to :

A
dispersion of light

B
scattering of light

C
reflection of light

D
refraction of light

Solution

Hint:
Rayleigh Scattering Theory suggests that scattering of light is inversely proportional to fourth power of wavelength of light.

Correct Option is B.
Explanation for the correct answer:
$$\bullet$$ Dispersion of Light is a phenomenon in which white light is dispersed into seven colors, when passed through a glass prism. This phenomenon is the reason for formation of rainbow, not for blue color of sky. Option A is incorrect.
$$\bullet$$ Scattering of light is the phenomenon in which path of light gets deviated by striking and obstacle like dust particles. The particles present in our atmosphere are of very small size. Thus, they can deviate only that part of light whose wavelength is closer to their size.
$$\bullet$$ White light coming from Sun is made up of seven colors. Wavelength of Red color is the largest and that of violet and blue is the smallest. Thus, the violet and blue color are scattered most by these particles, thus the sky appears to be blue. Option B is correct.
$$\bullet$$ Reflection of light is the phenomenon in which light bounces back after striking a surface. And retraction of light is bend in path of light when it the medium of its propagation changes. They are not responsible for blue color of light Option C and D are incorrect.

Thus, only Option B is correct.
Question 10
1 / -0

The speed at which the light travels in vacuum is:

A
$$3\times {10}^{6}m/s$$

B
$$3\times {10}^{8}m/s$$

C
$$3\times {10}^{10}m/s$$

D
$$3\times {10}^{12}m/s$$

Solution

The speed of light in vacuum is $$3 \times 10^8 \ m/s.$$
Thus, option B is correct.

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Human Eye and Colourful World Test - 34

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Human Eye and Colourful World Test - 34

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Question 1

(A) $$\rightarrow$$ r, (B) $$\rightarrow$$ q, (C) $$\rightarrow$$ p, (D) $$\rightarrow$$ s

(A) $$\rightarrow$$ p, (B) $$\rightarrow$$ r, (C) $$\rightarrow$$ s, (D) $$\rightarrow$$ q

(A) $$\rightarrow$$ s, (B) $$\rightarrow$$ p, (C) $$\rightarrow$$ r, (D) $$\rightarrow$$ q

(A) $$\rightarrow$$ q, (B) $$\rightarrow$$ r, (C) $$\rightarrow$$ p, (D) $$\rightarrow$$ s

Solution

Question 2

$$Convex$$

$$Concave$$

$$Bifocal$$

All of the above can be used

Solution

Question 3

Myopia

Astigmatism

Hypermetropia

Presbyopia

Solution

Question 4

Control intensity

Prevent internal reflection of light

Change of focal length of eye lens

All of the above

Solution

Question 5

Glass

Air

Water

Vacuum

Solution

Question 6

5 to 8 cm

10 to15 cm

20 to 25 cm

30 to 35 cm

Solution

Question 7

Virtual and erect

Virtual and inverted

Real and erect

Real and inverted

Solution

Question 8

Dispersion

Reflection

Refraction

Scattering

Solution

Question 9

dispersion of light

scattering of light

reflection of light

refraction of light

Solution

Question 10

$$3\times {10}^{6}m/s$$

$$3\times {10}^{8}m/s$$

$$3\times {10}^{10}m/s$$

$$3\times {10}^{12}m/s$$

Solution

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