Human Eye and Colourful World Test

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Human Eye and Colourful World Test - 44

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following statements are true for presbyopia?

A
Decreased power of accommodation

B
Weak ciliary muscles and reduced flexibility of eye lens

C
Usually occurs with increasing age

D
All of the above

Solution

In Presbyopia, the power of accommodation of the eye gradually decreases with age. For most people, the near point moves further away from 25cm. Sometimes, a person may suffer from both myopia and hypermetropia. This defect arises due to the gradual weakening of the ciliary muscles and diminishing flexibility of the eye lens.

So option A, B, C are correct. The answer is option D.
Question 2
1 / -0

Myopia may arise due to ____ .

a. Elongation of eyeball
b. Shrinking of the eyeball
c. Long focal length of the eye
d. Increased curvature of the eye lens

A
a and b

B
b and c

C
c and d

D
a and d

Solution

A person with myopia can see nearby objects clearly but cannot see distant objects distinctly. A person with this defect has the far point nearer than infinity. In a myopic eye, the image of a distant object is formed in front of the retina and not at the retina itself either because of the excessive curvature of the eye lens or elongation of the eyeball.
Question 3
1 / -0

How does concave lens correct myopia?

A
Increases the curvature of the eye lens

B
Forms the image of the object at the retina

C
Decreases the elongation of the eyeball

D
All of the above

Solution

A person with myopia cannot see distant objects clearly since the far point for that person is nearer than infinity. Such a person may see clearly up to a distance of a few meters. In this condition, the image of a distant object is formed in front of the retina and not at the retina itself. A concave lens of suitable power will bring the image back on to the retina and thus the defect is corrected.
Question 4
1 / -0

Myopia can be corrected by using a _____.

A
Converging lens

B
Bifocal lens

C
Diverging lens

D
None of the above

Solution

In a myopic eye, the image of a distant object is formed in front of the retina and not at the retina itself. This defect can be corrected with the help of a concave or diverging lens of suitable power as it will bring the image back on the retina.
Question 5
1 / -0

Which of the following statements are true for hypermetropia?
a. The near point is farther away from 25cm.
b. The image of the object is formed behind the retina.
c. It arises due to decreased power of accommodation.
d. It can be corrected by the diverging lens.

A
$$b$$ and $$c$$

B
$$c$$ and $$d$$

C
$$a$$ and $$b$$

D
$$a$$ and $$d$$

Solution

A person with hypermetropia can see distant objects clearly but cannot see nearby objects distinctly. The near point, for the person, is farther away from the normal near point $$(25\ cm)$$. This is because the light rays from a nearby object are the focus at a point behind the retina either because the focal length of the eye lens is too long or the eyeball has become too small. It can be corrected by the converging lens.
Question 6
1 / -0

Match the following:

List I List II
1 Myopia a Corrects far vision
2 Hypermetropia b Weakening of ciliary muscles
3 Presbyopia c Corrects near vision
4 Concave lens d Near sightedness
5 Convex lens e Far sightedness

A
1-b, 2-c, 3-a, 4-d, 5-e

B
1-d, 2-e, 3-b, 4-a, 5-c

C
1-a, 2-c, 3-e, 4-d, 5-b

D
1-c, 2-e, 3-d, 4-b, 5-a

Solution

Three common refractive defects of vision are myopia or near-sightedness, Hypermetropia or far-sightedness and Presbyopia. A person with myopia cannot see distant objects distinctly. In a myopic eye, the image of a distant object is formed in front of the retina and not at the retina itself. This defect can be corrected with the help of a concave lens of suitable power as it will bring the image back on to the retina. A person with hypermetropia cannot see nearby objects clearly. The near point is farther away from the 25 cm. This defect occurs because the image of the object is formed at a point behind the retina. This defect can be corrected by using a convex lens of appropriate power as it provides the additional focusing power required for forming the image at the retina. Presbyopia occurs due to decrease in the power of accommodation of the eye usually because of ageing which causes gradual weakening of the ciliary muscles and diminishes flexibility of the eye lens. Sometimes, a person may suffer from both myopia and hypermetropia. It can be corrected with the help of bifocal lenses.
Question 7
1 / -0

Presbyopia can be corrected with the help of _____ .

A
Bifocal lens

B
Diverging lens

C
Convex lens

D
All of the above

Solution

Presbyopia occurs due to gradual decrease in the power of accommodation of the eye with ageing. It arises due to the gradual weakening of the ciliary muscles and diminishing flexibility of the eye lens. The person may suffer from both myopia and hypermetropia. Such people often require bifocal lenses which consist of both concave and convex lenses. The upper portion consists of a concave lens which facilitates distant vision. The lower part is a convex lens which facilitates near vision.
Question 8
1 / -0

The phenomenon of scattering of light by fine particles is called _____ :

A
Snell's law

B
Dispersion effect

C
Law of refraction

D
Tyndall effect

Solution

The earth's atmosphere is a heterogeneous mixture of minute particles like smoke, tiny water droplets, suspended particles of dust, and molecules of air. When a beam of light strikes such fine particles, the path of the beam becomes visible. This phenomenon of scattering of light by such kinds of colloidal particles is called Tyndall effect.
Question 9
1 / -0

Which colour of light is scattered by very large particles?

A
Blue

B
Violet

C
Indigo

D
White

Solution

Scattering of light is the phenomenon in which light rays get deviated from their straight path on striking an obstacle like dust or gas molecules, water vapors, etc. Fine particles scatter light of shorter wavelength and larger particles scatter light of longer wavelength. However, if the size of the scattering particles is large enough, then, the scattered light may even appear white.
Question 10
1 / -0

Larger particles scatter light at the ____ end of the spectrum.

A
Blue

B
Green

C
Violet

D
Red

Solution

Larger particles scatter light at the red end of the spectrum. Because amount of scattering decreases with increase in wavelength.

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Re-Attempt Weekly Quiz Competition

	List I		List II
1	Myopia	a	Corrects far vision
2	Hypermetropia	b	Weakening of ciliary muscles
3	Presbyopia	c	Corrects near vision
4	Concave lens	d	Near sightedness
5	Convex lens	e	Far sightedness

Human Eye and Colourful World Test - 44

Result

Human Eye and Colourful World Test - 44

Score

-

Rank

-

SHARING IS CARING

Question 1

Decreased power of accommodation

Weak ciliary muscles and reduced flexibility of eye lens

Usually occurs with increasing age

All of the above

Solution

Question 2

a and b

b and c

c and d

a and d

Solution

Question 3

Increases the curvature of the eye lens

Forms the image of the object at the retina

Decreases the elongation of the eyeball

All of the above

Solution

Question 4

Converging lens

Bifocal lens

Diverging lens

None of the above

Solution

Question 5

$$b$$ and $$c$$

$$c$$ and $$d$$

$$a$$ and $$b$$

$$a$$ and $$d$$

Solution

Question 6

1-b, 2-c, 3-a, 4-d, 5-e

1-d, 2-e, 3-b, 4-a, 5-c

1-a, 2-c, 3-e, 4-d, 5-b

1-c, 2-e, 3-d, 4-b, 5-a

Solution

Question 7

Bifocal lens

Diverging lens

Convex lens

All of the above

Solution

Question 8

Snell's law

Dispersion effect

Law of refraction

Tyndall effect

Solution

Question 9

Blue

Violet

Indigo

White

Solution

Question 10

Blue

Green

Violet

Red

Solution

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