Tag: physics

Questions Related to physics

Match the column:


a. optic nerve i. coloured part of the eye
b. ciliary muscle ii. refracts light and focuses a real image on the back of eye
c. lens iii. it can increase or decrease the thickness of lens
d.iris iv. carries information to the brain about light that strikes the retina

physics the human eye and the colourful world human eye and its working what is inside our eyes? human eye and defects of vision

  1. a-i,b-iii,c-iv,d-ii

  2. a-ii,b-i,c-iv,d-iii

  3. a-iii,b-iv,c-i,d-ii

  4. a-iv,b-iii,c-ii,d-i

Show answer
Correct Option: D
Explanation:

Optic nerve carries information from retina to brain.

Iris is the coloured part of eye. It changes in size to vary the amount of light entering through the pupil.
The lens of the eye forms a real,inverted image of the object on the inner coat of the eye. The screen of eye is called the retina.Eye lens is a convex lens.
Ciliary muscle is a muscle surrounding the eye that can increase or decrease the curvature of lens.

Function of optic nerve in human eye:

physics the human eye and the colourful world human eye and its working what is inside our eyes? human eye and defects of vision

  1. Image is modified by the optic nerves

  2. Electric signals are generated on the retina are carried by the optic nerve to the brain

  3. Image brightness is reduced by the optic nerve

  4. All the above

Show answer
Correct Option: B
Explanation:

The light sensitive cells of the retina gets activated with the incidence of light and generates electric signals. The electric signals are sent to the brain by the optic nerve and the brain interprets the electric signals in such a way that we see an image which is erect and of the same size as the object.

When you enter a dim lighted room from sunlight at noon time.What is the change in size of pupil?

physics the human eye and the colourful world human eye and its working what is inside our eyes? human eye and defects of vision

  1. In the sunlight pupil contracts and after entering a dim lighted room the size of pupil increases.

  2. In dim light size of pupil decreases and in sunlight the pupil size increases

  3. Both  A and B can  occur.It depends on the size of eye

  4. No change in size of pupil

Show answer
Correct Option: A
Explanation:

In sunlight the size of pupil decreases but in dim light the pupil gets enlarged and thus lets more light into the eye.

Image forming light sensitive screen of the eye is known as __________ and it contains __________.

physics the human eye and the colourful world human eye and its working what is inside our eyes? human eye and defects of vision

  1. iris, blind spot

  2. cornea, blind spot

  3. retina, photoreceptors

  4. cornea, photoreceptors

Show answer
Correct Option: C
Explanation:

The lens of the eye forms a real, inverted image of the object on the inner coat of the eye. The screen of eye is called the retina. It is a delicate membrane having enormous number of light sensitive cells or photo-receptors, i.e rod and cone cells. 

What is the function of aqueous humour?

physics the human eye and the colourful world human eye and its working what is inside our eyes? human eye and defects of vision

  1. Helps in transmitting impulses to the brain

  2. Protect the eyeball from collapsing

  3. Keeps the cornea moist and give definite shape to the eyeball

  4. All

Show answer
Correct Option: C
Explanation:

Aqueous humour is present between cornea and eye lens. It keeps the cornea moist and maintains the shape of eye ball.

Which of the following is true for vitreous humour?
a. It is a clear gel like fluid.
b. It is present between the lens and the cornea.
c. It maintains the shape of the retina.
d. It provides nutrition to the eye.

physics the human eye and the colourful world human eye and its working what is inside our eyes? human eye and defects of vision

  1. a and b

  2. c and d

  3. a and c

  4. all of the above

Show answer
Correct Option: C
Explanation:

Vitreous humour is 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 it in its place.

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
physics the human eye and the colourful world human eye and its working what is inside our eyes? human eye and defects of vision

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

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

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

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

Show answer
Correct Option: B
Explanation:

Aqueous humour is a transparent, gelatinous fluid similar to plasma. It is present between the lens and the cornea. It helps in protection of the eye, provides nutrition to the eye, and allows exchange of gases & other substances between the eye & air. It also helps in maintaining the pressure in the eye. 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 provides the finer adjustment of focal length required to focus objects at different distances and forms an inverted real image of the object on the retina.

Which of the following statement is correct?

physics the human eye and the colourful world human eye and its working what is inside our eyes? human eye and defects of vision

  1. Vitreous fluid helps to maintain the shape of the retina

  2. Crystalline eye lens helps in focusing the image

  3. Aqueous humour helps to maintain the pressure in the eye

  4. All of the above

Show answer
Correct Option: D
Explanation:

Vitreous humour is 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 crystalline lens helps in finer adjustments of focal length required to focus objects at different distances and forms an inverted real image of the object on the retina. Aqueous humour is present between the lens and the cornea and helps in maintaining the pressure in the eye

Which part of the eye is a dark muscular diaphragm?

physics the human eye and the colourful world human eye and its working what is inside our eyes? human eye and defects of vision

  1. Iris

  2. Cornea

  3. Pupil

  4. Retina

Show answer
Correct Option: A
Explanation:

Iris is a dark muscular diaphragm that controls the size of the pupil. It is located behind the cornea.

The following properties belong to which part of the eye?
a. It is present between the lens and the cornea.
b. It acts as a protective layer.
c. It maintains the pressure of the eye and provides nutrition.

physics the human eye and the colourful world human eye and its working what is inside our eyes? human eye and defects of vision

  1. Iris.

  2. Aqueous humour

  3. Retina

  4. Vitreous humour

Show answer
Correct Option: B
Explanation:

Aqueous humour is a transparent, gelatinous fluid similar to plasma. It is present between the lens and the cornea. It helps in protection of the eye, provides nutrition to the eye, and allows exchange of gases & other substances between the eye & air. It also helps in maintaining the pressure in the eye.