CBSE Class 10 Science Human Eye And Colorful World Worksheet

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Worksheet for Class 10 Science Chapter 11 Human Eye and Colourful World

Class 10 Science students should refer to the following printable worksheet in Pdf for Chapter 11 Human Eye and Colourful World in Class 10. This test paper with questions and answers for Class 10 will be very useful for exams and help you to score good marks

Class 10 Science Worksheet for Chapter 11 Human Eye and Colourful World

Question. The danger signals installed at the top of tall buildings are red in color. These can be easily seen from a distance because among all other colors, the red light
(a) Is scattered the most by smoke or fog.
(b) Is scattered the least by smoke or fog.
(c) Is absorbed the most by smoke or fog.
(d) Moves fastest in air.
Answer :  B

Question. The clear sky appears blue because
(а) blue light gets absorbed in the atmosphere.
(b) Ultraviolet radiations are absorbed in the atmosphere.
(c) Violet and blue lights get scattered more than lights of all other colors by the atmosphere.
(d) light of all other colors is scattered more than the violet and blue color lights by the atmosphere.
Answer :  C

Question. A student is observing the diagram showing the path of a ray of light passing through a glass prism. He would find that for all angles of incidence the ray of light bends:
(а) towards the normal while entering into the prism and away from the normal while emerging out of the prism
(b) away from the normal while entering into the prism and towards the normal while emerging out of the prism.
(c) Away from the normal while entering as well as while emerging out of the prism.
(d) Towards the normal while entering as well as while emerging out of the prism.
Answer :  A

Question. Which of the following phenomena of light are involved in the formation of a rainbow?
(a) Reflection, refraction and dispersion
(b) Refraction, dispersion and total internal reflection
(c) Refraction, dispersion and internal reflection
(d) Dispersion, scattering and total internal reflection
Answer :  C

Question. The bluish color of water in deep sea is due to
(a) the presence of algae and other plants found in water
(b) reflection of sky in water
(c) scattering of light
(d) absorption of light by the sea.
Answer :  C

Question. The change in focal length of an eye lens is caused by the action of the    
(a) pupil
(b) retina
(c) ciliary muscles
(d) iris
Answer : C

Question. 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
Answer : B

Question. The human eye forms the image of an object at its    
(a) cornea
(b) iris
(c) pupil
(d) retina

Answer : D

Question. The least distance of distinct vision for a young adult with normal vision is about   
(a) 25 m
(b) 2.5 cm
(c) 25 cm
(d) 2.5 m
Answer : C

Question. Which of the following phenomena is not the result of total internal reflection? 
(a) Looming
(b) Sparkles of the diamond
(c) Mirage
(d) Twinkling of stars
Answer :  C
 
Question. Phenomenon responsible for twinkling of stars- 
(a) Atmospheric refraction
(b) Internal refraction
(c) None of these
(d) Regular refraction.
Answer :  A
Explanation: Twinkling of stars is due to atmospheric refraction. Distant star acts like a point source of light. When the starlight enters the earth’s atmosphere it undergoes refraction continuously, due to changing refractive index i.e. from Rarer to denser medium. It bends towards the normal successively, hence the amount of light enters our eyes fluctuates sometime bright and sometime faint. 
 
Question. Find the incorrect statement 
(a) Large sized particles scatter light of longer wavelengths
(b) Presbyopia occurs due to weakening of ciliary muscles
(c) Sun is visible 2 minutes after sunrise and 2 minutes before sunset
(d) Refractive index of glass for violet colour is more than that for red colour
Answer :  C
Explanation: Advance Sunrise and delayed sunset: This is due to atmospheric refraction. Because of this sun is visible about 2 minutes earlier than actual sunrise and about 2 minutes after the actual sun set. 
 
 

Assertion and Reason

DIRECTION : In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:
(a) Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
(b) Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
(c) Assertion (A) is true but reason (R) is false.
(d) Assertion (A) is false but reason (R) is true.
(e) Both Assertion and Reason are false.

Question. Assertion : The sky looks dark and black instead of blue in outer space.
Reason : No atmosphere containing air in the outer space to scatter sunlight.
Answer : A

Question. Assertion : The optical instruments are used to increase the size of the image of the object.
Reason : The optical instruments are used increase the visual angle.
Answer : D

Question. Assertion : Hypermetropia is the defect of the eye in which only farther objects are seen.
Reason : Hypermetropia is corrected by using converging lens.
Answer : B

Question. Assertion : A normal human eye can clearly see all the objects beyond certain minimum distance.
Reason : The human eye has capacity of adjusting the focal length of eye lens.
Answer : A

Question. Assertion : Rainbow is an example of the dispersion of sunlight by the water droplets.
Reason : Light of shorter wavelength is scattered much more than light of larger wavelength.
Answer : B

Question. Assertion : Thin prisms do not deviate light much.
Reason : Thin prism have small angle A and hence, Dm = [(μ - 1)A]
, where μ is the refractive index of prism w.r.t. medium 1.
Answer : A

Question. Assertion : Myopia is due to the increased converging power of the eye lens.
Reason : Myopia can be corrected by using spectacles made from concave lenses.
Answer : B

Question. Assertion : A normal human eye can clearly see all the objects beyond a certain minimum distance.
Reason : The human eye has the capacity to adjust suitable the focal length of its lens to a certain extent.
Answer : B

Question. Assertion : The optical instruments are used to increase the size of the image of the object.
Reason : The optical instruments are used to increase the visual angle.
Answer : D

Question. Assertion : A white light on passing through prism splits into its component colours as such that the red light emerges nearest to the base of the prism.
Reason : Wavelength of red light is more than other component colours and hence, red light deviates least.
Answer : D

Question. Assertion : The resolving power of a telescope is more if the diameter of the objective lens is more.
Reason : Objective lens of large diameter coileds more light.
Answer : A

Question. Assertion : The twinkling of stars is due to the fact that refractive index of the earth’s atmosphere fluctuates.
Reason : In cold countries, the phenomenon of looming (i.e., ship appears in the sky) takes place, because refractive index of air decreases with height.
Answer : B

 

Very Short Answer type Questions

Question. Why is a normal eye not able to see clearly the objects placed closer than 25 cm?
Answer : Ciliary muscles can contract the lens of human eye to a certain limit because of which a person with normal vision can see the nearby objects clearly only if placed at 25 cm but if the object is placed closer to the eye than it cannot see the objects clearly.

Question. What is meant by power of accommodation of the eye?
Answer : The ability of the eye to focus the distant objects as well as the nearby objects on the retina by changing the focal length of the eye lens is called power of accommodation.

Question. Why do stars twinkle?
Answer : Stars twinkle due to atmospheric refraction of light from the stars and changing density of air around the earth.

Question. A student has difficulty reading the blackboard while sitting in the last row. What could be the defect the child is suffering from? How can it be corrected? 
Answer : A student is suffering with the eye defect named myopia, in this defect person can see nearby objects clearly but cannot see far off objects distinctly. It can be corrected by using concave lens.

Question. Why does the sun appear reddish early in the morning?
Answer : When the sun rises early in the morning (or set in the evening), the light from sun travels through the thicker layer of air and larger distance of the atmosphere surrounding the earth. Hence the blue light scatters the most but red light does not scatters and reaches our eyes.

Question. What is the far point and near point of the human eye with normal vision?
Answer : The far point is infinity and the near point is 25 cm of the human eye with normal vision.

Question. What happens to the image distance in the eye when we increase the distance of an object from the eye?
Answer : The image distance in the eye remains the same. On increasing the distance of an object from the eye, the focal length of the eyes changes due to ciliary muscles which helps an eye to focus the object image on retina.

Question. Explain why the planets do not twinkle.
Answer : Planets are much closer to earth and behave like extended source.

Question. A person with a myopic eye cannot see objects beyond 1.2 m distinctly. What should be the type of the corrective lens used to restore proper vision?
Answer : A person with a myopic eye can use concave lens to restore proper vision.

Question. Why does the sky appear dark instead of blue to an astronaut?
Answer : In space there are no particles, air, gases, water droplets etc., present to scatter the light. So when the astronauts look at the sky in the space, there is no light entering our eyes, hence it appears dark 

 

Short Answer type Questions

Question. Name the three phenomenon of light responsible for the formation of rainbow in the sky.
Answer : Refraction, dispersion and internal reflection of light.

Question. Which component of white light is least scattered by fog or smoke? 
Answer : The component of white light which is least scattered by fog or smoke is red color.
 
Question. Which liquid is filled in the space between eye lens and retina? 
Answer : The liquid present between the eye lens and retina is vitreous humour. 
 
Question. What is meant by scattering of light? Mention the factor on which it depends. Explain, why the colour of the clear sky is blue? An astronaut in space finds sky to be dark. Explain reason for this observation. 
Answer :  i. Scattering occurs when a light ray passes through an imperfect medium (medium which have particles in it, which act as scatterer) and get deflected from its straight path and scatters in many directions.
The colour of scattered light depends on the size of scattering particles and wavelength of light.
Im-37
 
ii. The size of particles in the atmosphere is smaller than the wavelength of visible light, so they are more effective in scattering the light of shorter wavelengths, i.e. blue light. Thus, sky appears blue during the day.
iii. For an astronaut, sky appears dark because there is no scattering of light in space due to absence of particles.
 
 
Question. a. What is myopia? State the two causes of myopia. With the help of labelled ray diagrams show
i. the eye defect myopia
ii. correction of myopia using a lens.
b. Why is the normal eye unable to focus on an object placed within 10 cm from the eye? 
Answer :  a. Myopia is the defect of the eye vision due to which a person can see the near by objects clearly but cannot see the far objects so distinctly.
Causes of myopia: Myopia is caused due to:
i. the elongation of the eyeball.
ii. decrease in the focal length of the eye lens.
Im-38
Im-39
Myopia can be corrected by using a concave lens of suitable focal length in the spectacles of such a person.
b. The ability of the eye lens to adjust its focal length is called power of accommodation. However, the focal length of the eye lens cannot be decreased below a certain limit. The maximum accommodation of a normal eye is reached
when the object is at a distance of 25 cm from the eyes. Thus, the normal eye is unable to focus an object placed within 10 cm from the eye because the nearest distance of distinct vison for a normal eye is 25cm. 
 
 
Question. Describe Newton's disc experiment to show that white light is composed of seven spectrum colours. Why seven colours combine to give almost white but not perfectly white ? 
Answer :  Newton's colour disc: White light consists of seven colours. This can easily be proved byNewton's colour disc. A circular disc of cardboard is painted with coloured radial bands. Order of these colours and their relative widths are the same as in the
spectrum of sunlight. On rotating disc rapidly about its centre, all the colours blend and a sensation of almost white light is produced on the retina due to persistence of vision.
Im-40
Since we have used pigment colours instead of spectrum colours, the disc will not appear pure white but will give a dull appearance. Pigment colours are not pure colours and hence due to impurities, the appearance of the disc is grayish instead of perfectly white.

 

More Important Questions For Human Eyes And Colourful World

Question. Nitin and his four friends were sitting on his roof on a pleasant day. All of them were enjoying Ludo. Suddenly Aryu saw seven colors in the sky. He jumped with joy and shouted “Look, there is an Indradhanush in the sky”. Then Nitin explained all about the rainbow. After that every one clapped for him.
(a) What information is given by Nitin to his friends about a rainbow?
(b) Is it possible to obtain rainbow phenomenon on the earth?
(c) Which term is used for the seven colors of the rainbow?
Answer :
(a) Rainbow is a natural phenomenon in which an arch of seven colors visible in the sky is produced by the dispersion of white sunlight by raindrops in the atmosphere. Each raindrop acts as a tiny glass prism splitting the sunlight into seven colors.
(b) Yes, in daily life, when white light of the Sun is passed through a glass prism, it splits into seven colors.
(c) The band of seven colors obtained by the splitting of white light is called spectrum.
(d) The red color appears at the top of the rainbow whereas violet color appears at its bottom.

 

Question. (a) Draw a ray diagram to explain the term angle of deviation.
(b) Why do the component colors of incident white light split into a spectrum while passing through a glass prism, explain.
(c) Draw a labeled ray diagram to show the formation of a rainbow.
Answer :  (a) Angle of deviation is the angle between extended incident ray and extended emergent ray through a prism.
PQ = Incident Ray
RS = Emergent Ray
∠D = Angle of Deviation
(b) The incident white light splits into a seven colored spectrum as speed of different colored light waves is different when these pass through the prism.

Class 10 Science Human Eyes And Colourful World_6

1 Mark Questions

Q.1. What is the defect from which the eye shown in the figure suffers?

Q.2. The image of an object near the eye is being formed at I, as shown. Name the defect from which the eye suffers.

Q.3. Complete the given diagram for a corrected myopic eye. Where are the far point and the near point for such an eye?

Q.4. Complete the given fig. for a hypermetropic eye. Mark the near point and the far point of such an eye.

Q.5. In fig below, three cases of a ray of light passing through a prism. Which of these rays is suffering minimum deviation ?

Q.6. Figure shows a ray of white light suffering dispersion. Correct the diagram if you feel it needs correction and redraw it.

Q.7. What is meant by power of accommodation of the eye ?

Q.8. What is the far point and near point of the human eye with normal vision?

Q.9. A student has difficulty reading the blackboard while sitting in the last row.

What could be the defect the child is suffering from? How can it be corrected?

Q.10. Why is a normal eye not able to see clearly the objects placed closer than 25 cm?

Q.11. What happens to the image distance in the eye when we increase the distance of an object from the eye?

Q.12. Why does the sky appear dark instead of blue to an astronaut?

Q.13. Name the essential parts of human eye.

Q.14. What is cornea?

Q.15. Which liquid fills the space behind the cornea?

Q.16. What is iris?

Q.17. Which part of the eye controls the amount of light entering the eye?

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