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10th Science The Human Eye and the Colourful World Important Question Paper

Published on: 03/12/2018

From the chapter The Human Eye and the Colourful World some of the important questions are covered in this questions paper.

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Questions:

Multiple Choice Question

5 x 1 = 5

Which of the following statement is correct?

(a)

A person with myopia can see distant objects clearly

(b)

A person with hypermetropia can see nearby objects clearly

(c)

A person with myopia can see nearby objects clearly

(d)

A person with hypermetropia cannot see distant objects clearly

The focal length of the eye lens increases when eye muscles

(a)

are relaxed and lens becomes thinner

(b)

contract and lens becomes thicker

(c)

are relaxed and lens becomes thicker

(d)

contract and lens becomes thinner

Twinkling of stars is due to atmospheric

(a)

dispersion of light by water droplets

(b)

refraction of light by different layers of varying refractive indices

(c)

scattering of light by dust particles

(d)

internal reflection of light by clouds

The change in focal length of eye lens is caused by action of

(a)

Pupil

(b)

Retina

(c)

Ciliary muscles

(d)

Iris

The human eye can focus objects at different distances by adjusting the focal length of the eye lens. This is due to

(a)

Presbyopia

(b)

Accommodation

(c)

Near sightedness

(d)

Far sightedness

Generic 2

8 x 2 = 16

Name the three common defects of vision. What are their causes? Name the type of lens used to correct each of them.

What is the function of optic nerve in the human eye?

What is the nature of image formed on the retina?

Give an example of optical phenomena which occurs in nature due to atmospheric refraction.

10.

Name the type of particles which act as prism in the formation of rainbow in the sky

11.

The sky appears dark instead of blue to an astronaut. State its reason.

12.

What is the difference in colours of the Sun observed during sunrise/sunset and noon? Give explanation for each

13.

Why do stars twinkle?

Generic 5

2 x 5 = 10

14.

(a)Write the function of each of the following parts of human eye:
cornea; iris; crystalline lins; ciliary muscles
(b)Millions of people of the developing countries of the work are suffering from corneal blindness. These persons can be cured by replacing the defective cornea with the cornea of a donated eye. A charitable society of your city has organised a campaign in your neighbourhood in order to create awareness about this fact. If you are asked to participate in this mission how would you contribute in this noble cause?
(i)State the objective of organising such campaigns.
(ii)List two arguments which you would give to motivate the people to donate their eyes after death.
(iii)List two values which are developed in the persons who actively participate and contribute in such programmes.

15.

(a)Explain the following terms used in relation to defects in vision and correction provided by them:
(i)Myopia (ii)Astigmatism
(iii)Bifocal lenses (iv)Far-sightedness.
(b)Why is the normal eye unable to focus on an object placed within 10cm from the eye?

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Answers Key:

Multiple Choice Question

5 x 1 = 5

(a)
are relaxed and lens becomes thinner

(b)
refraction of light by different layers of varying refractive indices

(b)
Accommodation

Generic 2

8 x 2 = 16

(i) Myopia :
Cause: Elongation of eyeball,
Type of lens used for correction:
Concave lens of suitable power.
(ii) Hypermetropia:
Cause: Shrinking of eyeball,
Type of lens used for correction:
Concave lens of suitable power.
(iii) Presbyopia:
Cause: Weakening of ciliary mucles,
Type of lens used for correction:
Bifocal lens.

It carries image formed on the retina to brain in the for of electrical signals

Real and inverted.

Twinkling of stars.

10.

The rain drops in the atmosphere act like many small prisms by splitting g the white light entering into it.

11.

The sky appears dark to the astronauts due to absence of atmosphere at very high altitudes.

12.

During sunrise/sunset, the looks reddish. This is because at this because at this stage, rays from the sun have to travel a much larger part of atmosphere. The red colour having largest wavelength is scattered the least.
At noon, the sun is nearly overhead. The sunlight has to pass through much smaller portion of earth's atmosphere the scattering is much less and the sun looks white.

13.

Stars twinkle due to atmospheric refraction of starlight. The starlight passes through different layers of atmospheric medium of gradually changing refractive index. So, it is refracted multiple times. As the apparent position of star and the physical condition of the earth's atmosphere are not constant the amount of starlight entering the eye flickers and gives a twinkling effect.

Generic 5

2 x 5 = 10

14.

(a) Functions of the following parts of human eye:
(i) Comea: Objects enters the eye through cornea.
(ii) Iris: Iris controls the size of the pupil.
(iii) Crystalline lens: It focuses the image of the object on the retina.
(iv) Ciliary muscles: Ciliary muscles hold the eye lens and change the thickness of eye lens while focussing.
(b) (i) Objective of such campaigns. To make people aware of corneal blindness and make them realise their duties towards the society by taking pledge for eye donation.
(ii) (a) One pair of eyes can give eyesight to two corneal blind persons and make them see this beautiful world.
(b) Our eyes can live even after our death. People belonging to all age groups, even people with medical conditions like cataract, diabetes, hypertension can donate their eyes.
(iii) Values developed in persons who actively participate in such programmes:
(a) Concern for others and social welfare.
(b) Responsible behaviour and awareness.

15.

(a) (i) Myopia: Short-sightedness is caused due to excessive is caused due to excessive curvature in cornea or elongation of eyeball. Image is formed before of the retina. So, a concave lens is used to correct it.
(ii) Astigmatism: The inability to focus the light n both vertical and horizontal lines is called astigmatism. It is caused due to varying curvature in lens both horizontally and vertically. It is corrected by using cylindrical lens.
(iii) Bifocal lenses: These are used to correct presbyopic eye. These contain lenses with upper concave and lower convex surface. Presbyopia arises with age.
(b) The focal length of the lens cannot be changed up to an extent that objects nearer than 25 cm can be viewed. So it is not able to focus for 10 cm.