Human Eye and Colourful World Test

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Human Eye and Colourful World Test - 43

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Question 1
1 / -0

Match the following
List I List II
1 Change in curvature a 25 cm
2 Relaxed ciliary muscles b Curvature of the lens decreases
3 Thick lens c Change in focal length
4 Near point d Focal length increases

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

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

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

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

Solution

The change in the curvature of the eye lens can thus change its focal length to facilitate clear vision of close or far away objects. The ability of the eye lens to adjust its focal length is called accommodation. When the muscles are relaxed, the curvature decreases making the lens thin and the focal length increases. Similarly when the ciliary muscles contract the curvature of the eye lens decreases making them thicker, this decreases the focal length of the eye. For a young adult with normal vision, the near point is about 25 cm
Question 2
1 / -0

Bi-focal lens is required to correct:

A
cataract

B
astigmatism

C
myopia

D
presbyopia

Solution

Presbyopia is a defect of human eye. With this defect of vision, a person is unable to read or write comfortably. It is corrected by bifocal lens.
Question 3
1 / -0

Which of the following is not true for the eye lens?

A
It is composed of a fibrous, jelly-like material.

B
Its curvature can be modified to some extent by the ciliary muscles.

C
When the muscles are relaxed, the lens becomes thin.

D
When the muscles are relaxed, the lens becomes thick.

Solution

The eye lens is composed of fibrous, jelly-like material. Its curvature can be modified to some extent by the ciliary muscles. The change in the curvature of the eye lens can thus change its focal length. When the muscles are relaxed, the lens becomes thin. Thus option $$D$$ is incorrect.
Question 4
1 / -0

Which of the following adjustments are made by the eye to enable the clear vision of distant objects?

A
Relaxation of ciliary muscles

B
Thinning of the eye lens

C
Increasing the focal length

D
All of the above

Solution

The curvature of the eye lens can be modified to change its focal length to some extent by the ciliary muscles. When the muscles are relaxed, the curvature decreases making the lens thin and the focal length increase. This enables us to see distant objects clearly.
Question 5
1 / -0

The refractive defects of vision are
a. Myopia b. Cataract
c. Hypermetropia d. Presbyopia

A
a and b

B
a, c and d

C
b and c

D
All of the above

Solution

Sometimes, the eye may lose its power of accommodation. In such cases, the vision becomes blurred due to the refractive defects of the eye. Three common refractive defects of vision are myopia or near-sightedness, Hypermetropia or farsightedness and Presbyopia.
A cataract is a clouding of eye lenses. it is denser so eyes make blurred images on the retina.
Question 6
1 / -0

Match the following
List I List II
1 Aqueous humour a Forms inverted image on the retina
2 Vitreous humour b Spherical
3 Eyeball c Present between lens and retina
4 Crystalline lens d Present between lens and cornea

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

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

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

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

Solution

Aqueous humour is a transparent, gelatinous fluid similar to plasma. It is present between the lens and the cornea. Vitreous humour is also a clear gelatinous gel like fluid that fills the space between the lens and the retina. It helps in maintaining the shape of the retina by holding the retina in its place. The eyeball is approximately spherical in shape with a diameter of about 2.3 cm. The crystalline eye lens forms an inverted real image of the object on the retina, thus the correct matches are given in option $$B$$.
Question 7
1 / -0

Fill up the blanks:
a) light sensitive screen of human eye..............
b) near sightedness is corrected by..................
c) hypermetropia is corrected by.................
d) range of vision for a normal eye............

A
a. retina
b. concave lens
c. convex lens
d. $$25cm-$$infinity

B
a. cornea
b. convex lens
c. concave lens
d. $$0-25cm$$

C
a. iris
b. converging lens
c. diverging lens
d. $$0-$$infinity

D
a. sclera
b. diverging lens
c convex lens
d. infinity

Solution

The screen of eye is called the retina.It is a delicate membrane having enormous number of light sensitive cells or photo-receptors.
Myopia or, near sightedness is corrected by concave lens.
Hypermetropia or, far sightedness is corrected by convex lens.
Range of vision for normal eye is $$25cm$$ to infinity.
Question 8
1 / -0

The refractive defects of the eye can be corrected by _____ :

A
Eye glasses

B
contact lenses

C
Surgical procedures

D
All of the above

Solution

Sometimes, the eye may lose its power of accommodation. In such cases, the vision becomes blurred due to the refractive defects of the eye. These defects can be corrected by the use of suitable spherical lenses
.It is possible to correct the refractive defects of the eye (such as myopia and hypermetropia) by using contact lenses or by undergoing surgical procedures for example ,surgical treatment of the eye with lasers.
Question 9
1 / -0

Hypermetropia may arise due to _____:
a. Shrinking of the eyeball.
b. Elongation of eyeball.
c. Long focal length of the eye.
d. Excessive curvature of the eye lens.

A
b and c

B
a and c

C
a and d

D
b and d

Solution

Hypermetropia is a refractive defect of the eye in which the person is unable to see nearby objects clearly. The near point is farther away from the normal near point (25 cm). This happens because the light rays from a nearby object focus at a point behind the retina. Hypermetropia arises either because the focal length of the eye lens is too long which increases the near point, or the eyeball has become too small which makes it difficult to form the image at the retina.
Question 10
1 / -0

The condition occurring due to gradual decrease in power of accommodation because of ageing is called ____ .

A
Near-sightedness

B
Hypermetropia

C
Presbyopia

D
Cataract

Solution

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 is called Presbyopia. It arises due to the gradual weakening of the ciliary muscles and diminishing flexibility of the eye lens.

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Re-Attempt Weekly Quiz Competition

	List I		List II
1	Change in curvature	a	25 cm
2	Relaxed ciliary muscles	b	Curvature of the lens decreases
3	Thick lens	c	Change in focal length
4	Near point	d	Focal length increases

	List I		List II
1	Aqueous humour	a	Forms inverted image on the retina
2	Vitreous humour	b	Spherical
3	Eyeball	c	Present between lens and retina
4	Crystalline lens	d	Present between lens and cornea

Human Eye and Colourful World Test - 43

Result

Human Eye and Colourful World Test - 43

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Question 1

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

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

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

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

Solution

Question 2

cataract

astigmatism

myopia

presbyopia

Solution

Question 3

It is composed of a fibrous, jelly-like material.

Its curvature can be modified to some extent by the ciliary muscles.

When the muscles are relaxed, the lens becomes thin.

When the muscles are relaxed, the lens becomes thick.

Solution

Question 4

Relaxation of ciliary muscles

Thinning of the eye lens

Increasing the focal length

All of the above

Solution

Question 5

a and b

a, c and d

b and c

All of the above

Solution

Question 6

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

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

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

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

Solution

Question 7

a. retinab. concave lensc. convex lensd. $$25cm-$$infinity

a. corneab. convex lensc. concave lensd. $$0-25cm$$

a. irisb. converging lensc. diverging lensd. $$0-$$infinity

a. sclerab. diverging lensc convex lensd. infinity

Solution

Question 8

Eye glasses

contact lenses

Surgical procedures

All of the above

Solution

Question 9

b and c

a and c

a and d

b and d

Solution

Question 10

Near-sightedness

Hypermetropia

Presbyopia

Cataract

Solution

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a. retina
b. concave lens
c. convex lens
d. $$25cm-$$infinity

a. cornea
b. convex lens
c. concave lens
d. $$0-25cm$$

a. iris
b. converging lens
c. diverging lens
d. $$0-$$infinity

a. sclera
b. diverging lens
c convex lens
d. infinity