CBSE Class 10 Physics The Human Eye and The Colorful World Worksheet Set B

Read and download free pdf of CBSE Class 10 Physics The Human Eye and The Colorful World Worksheet Set B. Download printable Science Class 10 Worksheets in pdf format, CBSE Class 10 Science Chapter 11 The Human Eye and The Colourful World Worksheet has been prepared as per the latest syllabus and exam pattern issued by CBSE, NCERT and KVS. Also download free pdf Science Class 10 Assignments and practice them daily to get better marks in tests and exams for Class 10. Free chapter wise worksheets with answers have been designed by Class 10 teachers as per latest examination pattern

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

Class 10 Science students should refer to the following printable worksheet in Pdf in Class 10. This test paper with questions and solutions for Class 10 Science will be very useful for tests and exams and help you to score better marks

Class 10 Science Chapter 11 The Human Eye and The Colourful World Worksheet Pdf

Question. Colour of sky appears blue, due to the
(A) atmospheric refraction
(B) presence of plants in water
(C) scattering of light
(D) none of these
Answer. C

Question. Colour of sun appears white During the day time beacase
(A) Blue colour scatter most
(B) Red colour scatter most
(C) All colours of white light scattered away
(D) white colour is least scattered
Answer. C

Question. Red colour is used as danger sign as
(A) red colour scattered least by smoke
(B) red colour scattered most by smoke
(C) Red colour absorbs by the smoke
(D) red colour moves fast in air
Answer. A

Question. Phenomenon on which human eye is working-
(A) refraction
(B) reflection
(C) total internal refraction
(D) ciliary muscles
Answer. B

Question. Which colour of light refracts most when passes through a prism-
(A) yellow
(B) Red
(C) orange
(D) indigo
Answer. D

Question. Which of the following controls the amount of light entering the eye
(A) pupil
(B) iris
(C) cornea
(D) lens
Answer. B

Question. Which type of image formed on the retina of human eye
(A) Real and Inverted
(B) Virtual and Inverted
(C) real and erect
(D) virtual and erect
Answer. A

Question. The change of focal length of eye lens is caused by the action of the
(A) ciliary muscles
(B) iris
(C) cornea
(D) pupil
Answer. A

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 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

 

ASSERTION AND REASON BASED QUESTIONS 
Answer these questions selecting the appropriate option given below.
(A) Both A and R are true and R is correct explanation of A.
(B) Both A and R are true but R is not correct explanation of A.
(C) A true but R is false
(D) A false but R is true

Question. Assertion- A beam of white light gives a spectrum on passing through a prism.
Reason- Speed of light outside the prism is different from the speed of light inside the prism.
Answer. A

Question. Assertion- myopia is called far-slightness
Reason- myopia is corrected by using a concave lens in front of eye lens
Answer. D

Question. Assertion- by using Tyndall effect we can identify the colloidal solutions
Reason- In true solution the path of light is not visible.
Answer. A

Question. Assertion- atmospheric refraction is responsible for advance sunrise and delayed sunset.
Reason- This is happening due to the temperature difference between the layers of air.
Answer. A

Question. Assertion- cataract can be corrected by using bi-focal lens.
Reason – The crystalline lens of old peoples become milky and cloudy; this is due to the age of person.
Answer. D


Case study-based Questions- 

When a ray of light incident on a prism it will split in seven colours that is called dispersion of light. A prism is a transparent refracting body bounded by plane faces which are inclined to each other at a particular angle called angle of prism denoted by A . When a ray of light passes through a prism, it suffers refraction twice and hence the ray deviates through a certain angle from its original path. The angle between the incident ray and emergent ray is called angle of deviation.

Question. For which colour the angle of deviation is minimum?
A. Red
B. Blue
C. Violet
D. Yellow
Answer. A

Question. When a white light falls on a prism, the ray at its surface suffers:
(A) Refraction only
(B) dispersion only
(C) deviation only
(D) all of above
Answer. D

Question. In nature, dispersion of light is happening in
(A) Blue colour of sky
(B) Formation of rainbow
(C) Twinkling of stars
(D) advance sunrise
Answer. B

Question. The cause of dispersion of light is –
(A) All colours of light travel with the speed more than the speed of light
(B) All colours have different angle of deviation
(C) All the colours of light do not travel with same speed
(D) All the colours have same wavelength
Answer. C

Question. The following diagram, the path of a ray of light passing through a glass prism is shown below.

CBSE-Class-10-Physics-The-Human-Eye-and-The-Colorful-World

In this diagram, the angle of incidence, the angle of emergence and the angle of deviation respectively, are
(a) X, R and T
(b) Y, Q and T
(c) X, Q and P
(d) Y, Q and P
Answer. D

 
Very Short Answer
 
Question. What is blind spot? 
Answer: A blind spot is a small area of the retina insensitive to light where the optic nerve leaves the eye.
 
Question. Which color light has the maximum speed in the glass prism? 
Answer: Red color light has the maximum speed in the glass prism.
 
Question. What is stereoscopic vision? 
Answer: Stereoscopic vision is a three-dimensional vision produced by the fusion of two slightly different views of a scene on each retina.
 
Question. Which color light has the least speed in glass prism? 
Answer: Violet color light has the least speed in the glass prism.
 
Question. What is scattering of light?
Answer: Scattering of lights means to throw light in the various random directions.
 
Question. Name the type of particles which act as prisms in the formation of rainbow in the sky. 
Answer: The rain drops in the atmosphere act like many small prisms. As white sunlight enters and leaves these raindrops, the white light splits into an arch of seven colours of rainbow.
 
Question. What is Tyndall effect? 
Answer: The scattering of a beam of light is called the Tyndall effect. Tyndall effect can be observed when sunlight passes through the canopy of a dense forest. In a dense forest, the mist contains tiny droplets of water, which act as particles of colloid dispersed in air.
 
Question. State one function of pupil in human eye. 
Answer: The amount of light entering the eye can be controlled by the pupil. If the intensity of outside light is low, then the pupil expands to allow more light to enter the eye. On the other hand, if outside intensity of light is high, then the pupil contracts so that less light enters the eye.
 
Question. Why does the sky appear dark instead of blue to an astronaut?
Answer: There is no atmosphere containing air in space to scatter sunlight. As there is no scattering of light in space, the scattered light does not reach the eyes and the sky appears dark instead of blue to an astronaut in outer space.
 
Question. Why does a ray of light while passing through a prism, bend towards its base?
Answer: When a ray of light passes through a prism, it under goes refraction twice. First from rarer to denser medium of glass, it bends towards normal which is towards the base of the prism. Second time from denser to rarer medium, i.e., glass to air, it bends away from the normal, i.e., towards the base of the prism.
 
Question. In the experiment to trace the path of a ray of light through a triangular glass prism,
(i) a student is asked to draw the boundary of prism on the paper, why?
(ii) if the angle of incidence is 30°, what can be the measure of angle of emergence at the minimum deviation condition of the prism?
Answer: (i) It ensures that prism is always kept within this boundary during the experiment.
(ii) At the minimum deviation condition, ∴ Angle of Emergence = Angle of Incidence –e = –i = 30°
 
Question. In the experiment to trace the path of a ray of light through a triangular glass prism,
(i) if the emergent ray makes an angle of 35° with the second face of prism, then what is the angle of emergence?
(ii) can the angle of deviation be zero and why?
Answer: (i) The angle of emergence –e = 90° – 35° = 55°
(ii) No, because at the second refracting surface of the prism, ray of light moves from denser to rarer medium; it bends away from the normal, i.e., bends towards the base of the prism.
 
Question. A student cannot see a chart hanging on a wall placed at a distance of 3 m from him. Name the defect of vision he is suffering from. How can it be corrected? Draw ray diagrams for the (i) defect of vision and also (ii) for its correction. 
Answer: If a student cannot see the object clearly placed at a distance of 3 m from him then he is suffering from Myopia or Short Sightedness.
Ray diagrams for the (i) defect of vision and (ii) for its correction:
 
Question. When we place a glass prism in the path of a narrow beam of white light, a spectrum is obtained.
What happens when a second identical prism is placed in an inverted position with respect to the first prism?
Answer: Second prism recombines the spectrum obtained by the first prism. So, from the other side of the second prism, a beam of white light is again obtained as shown in figure given below:
 

Short Answer Questions

 

Question. A narrow beam PQ of white light is passing through a glass prism ABC as shown in the diagram.
(i) Write the name and cause of the phenomenon observed.
(ii) Where else in nature is this phenomenon observed?
(iii) Based on this observation, state the conclusion which can be drawn about the constituents of white light.
Answer: (i) The phenomenon of splitting of white light into seven colours on passing through a glass-prism is called dispersion of light. The dispersion of white light occurs because colours of white light travel at different speeds through the glass prism.
(ii) Formation of rainbow is an example of dispersion of white light in nature.
(iii) The formation of spectrum of seven colours shows that white light is made up of lights of seven different colours mixed together. That is, white light is a mixture of seven colours (or seven coloured lights), i.e., red, orange, yellow, green, blue, indigo and violet.

Question. With the help of a labelled diagram, explain why the sun appears reddish at the sunrise and the sunset.
Answer: At the time of sunrise and sunset when the sun is near the horizon, the sunlight has to travel the greatest distance through the atmosphere to reach us. During the long journey of sunlight, most of the shorter wavelength blue-colour present in it is scattered out and away from our line of sight so, the light reaching us directly from the rising sun or setting sun consists mainly of longer wavelength red colour due to which the sun appears red. Due to the same reason, the sky surrounding the rising sun and setting sun also appears red. Thus, at sunrise and sunrise, the sun itself as well as the surrounding sky appear red.

Question. Why does the sun appear reddish early in the morning? Will this phenomenon be observed by an observer on the moon? Justify your answer with a reason. 
Answer: The sun at sunrise (early in the morning) is located near the horizon of the earth. Light from the sun near the horizon has to pass through thick layers of air and a large distance through the earth’s atmosphere before reaching our eyes. Near the horizon, most of the blue light rays with shorter wavelength are scattered away by the particles in the atmosphere. Therefore, the light that reaches our eyes is the red light of longer wavelengths. This gives rise to the reddish appearance of the sun.
This phenomenon will not be observed by an observer on the moon because there is no atmosphere on the moon to scatter light.

Question. State the cause of dispersion of white light passing through a glass prism. How did Newton show that white light of Sun contains seven colours using two identical glass prisms. Draw a ray diagram to show the path of light when two identical glass prisms are arranged together in inverted position with respect to each other and a narrow beam of white light is allowed to fall obliquely on one of the focus of the first prism.
Answer: • White light is a mixture of lights of seven colours, red, orange, yellow, green, blue, indigo and violet.
The dispersion of white light occurs because colours of white light travel at different speeds through the glass prism. The amount of refraction depends on the speed of coloured light in glass.
• When white light consisting of seven colours falls on a glass prism, each colour in it is refracted by a different angle, with the result that seven colours are spread out to form a spectrum. The red light bends the least, while violet bends the most.
Newton’s experiment with two identical prisms:
• When a beam of white light is passed through a glass prism, a band of seven colours is formed on a white screen. This band of seven colours is called spectrum of white light.
• Newton showed that the seven coloured lights of the spectrum can be recombined to give back white light.
• First he tried to split the colours of the spectrum of white light using a prism.
• He then placed a second identical prism in an inverted position with respect to the first prism. This allowed all the colours of the spectrum to pass through the second prism. He found a beam of white light emerging from the other side of the second prism.

Question. Explain with the help of a diagram, how we are able to observe the sunrise about two minutes before the Sun gets above the horizon. 
Answer: The Sun can be seen about two minutes before sunrise because when the Sun is slightly below the horizon, the Sun’s light coming from less dense air to more dense air is refracted downwards as it passes through the atmosphere. Thus due to this atmospheric refraction, the Sun appears to be raised above the horizon when actually it is slightly below the horizon.

Question. (a) What are the values of (i) near point and (ii) far point of vision of a normal adult person?
(b) A student has difficulty in reading the blackboard while sitting in the last row. What could be his defect of vision? Draw a ray diagram to illustrate this defect of vision. 
Answer: (a) (i) The nearest point up to which the eye can see an object clearly without any strain is called the near point of the eye. The near point of a normal human eye is at a distance of 25 cm from the eye.
(ii) The farthest point from the eye at which an object can be seen clearly is known as the far point of the eye. The far point of a normal human eye is at infinity.
(b) This defect of vision is called myopia. 

Question. Draw a diagram to show the dispersion of white light by a glass prism. What is the cause of this dispersion? 
Answer: • The splitting up of white light into seven colours on passing through a transparent medium like a glass prism is called dispersion of light.
• We get different colours of light when white light is passed through a glass prism because white light is a mixture of lights of seven colours: red, orange, yellow, green, blue, indigo and violet. The dispersion of light occurs because the angle of refraction (or angle of bending) of lights of different colours is different when passing through the glass prism.

Question. (a) What is meant by the dispersion of white light? Draw a diagram to show dispersion of white light by the glass prism.
(b) Explain why the planets do not twinkle but the stars twinkle. 
Answer: (a) Dispersion of light. The splitting of white light into its component colours on passing through a prism is called dispersion of light.
(b) The planets are much closer to the earth. A planet can be considered as a collection of large number of point-sized sources of light. So the total variation in the amount of light entering our eye from all the individual point-sized sources will average out to zero thereby nullifying the twinkling effect.
On the other hand, stars twinkle because stars are point-sized sources of energy therefore the continuously changing atmosphere causes atmospheric refraction which causes variation in light.

Question. (a) What is meant by the power of accommodation of an eye?
(b) A person with a myopic eye cannot see objects beyond 1.2 m directly. What should be the type of the corrective lens used? What would be its power?
Answer: (a) The ability of an eye to focus the distant objects as well as the nearby objects on the retina by changing the focal length or converging power of its lens is called power of accommodation. A normal eye has a power of accommodation which enables objects as far as infinity and as close as 25 cm to be focussed on the retina.
(b) Myopic eye
v = 1.2 m = –120 cm; u = ∞ (infinity); P of the corrective lens = ?
By Lens formula, 
1/v - 1/u = 1/f ⇒ 1/-120 - 1/∞ = 1/f
-1/120 - 0 = 1/f (∴ 1/∞ = 0) ⇒ -1/120 = 1/f
∴ f = –120 cm
Thus the corrective lens for the above defect is concave lens (as focal length has –ve sign) of focal length of 120 cm.
P = 1/f (in metres) = 1 x 100 /-120 = –0.83 D

Question. Why does the Sun appear reddish early in the morning?
Answer: The Sun at sunrise (early in the morning) is near the horizon. Light from the Sun near the horizon has to pass through thick layers of air and a large distance through the earth’s atmosphere before reaching our eyes. Near the horizon, most of the blue-light of shorter wavelengths are scattered away by the particles.
Therefore, the light that reaches our eyes is of longer wavelengths, i.e., red light. This gives rise to the reddish appearance of the Sun.

Question. Why is a normal eye not able to see clearly the objects placed closer than 25 cm?
Answer: The maximum accommodation of a normal eye is reached when the object is at a distance of 25 cm from the eye. The focal length of the eye lens cannot be adjusted below this minimum limit. The rays coming from the objects which are at a distance less than 25 cm are not focussed at the retina and the image of the object appears blurred. Thus, the image cannot be seen clearly.

Question. A person needs a lens of power –5.5 dioptres for correcting his distant vision. For correcting his near vision he needs a lens of power +1.5 dioptre. What is the focal length of the lens required for correcting
(i) distant vision, and (ii) near vision?
Answer: (i) Power, P = –5.5 D, Focal length, f = ?
P = 1/f or –5.5 = 1/f ∴ f = 1/-5.5m = – 0.18 m
Negative sign indicates that the lens is concave.
(ii) Power, P = +1.5 D Focal length, f = ?
P = 1/f or +1.5 = 1/f ∴ f =f = 1/+1.5m = +0.67 m
Positive sign indicates that the lens is convex.

Question. Why do stars twinkle?
Answer: The twinkling of a star is due to atmospheric refraction of starlight. The atmospheric refraction occurs in a medium of gradually changing refractive index. Since the atmosphere bends starlight towards the normal, the apparent position of the star is slightly different from its actual position. This apparent position of the star is not stationary, but keeps on changing slightly, as the physical conditions of the earth’s atmosphere are not stationary. Since the stars are very distant, they act as point-sized sources of light.
As the path of rays of light coming from the star goes on varying slightly, the apparent position of the star fluctuates and the amount of starlight entering the eye flickers—the star sometimes appears brighter, and at some other time, fainter, which is the twinkling effect.

Question. Due to gradual weakening of ciliary muscles and diminishing flexibility of the eye lens a certain defect of vision arises. Write the name of this defect. Name the type of lens required by such persons to improve the vision. Explain the structure and function of such a lens.
Answer: The defect of this vision is called Presbyopia. Bifocal lens is used for the correction of this defect. The upper part of this lens is concave and the lower part of the lens is Convex lens. The upper part of the lens is used to see the distant objects clearly and lower part of this lens is used to see the nearby objects clearly.

 

Long Answer Questions

 

Question. A student is unable to see clearly the words written on the blackboard placed at a distance of approximately 4 m from him.
Name the defect of vision the boy is suffering from. Explain the method of correcting this defect. Draw ray diagram for the: 
(i) defect of vision and also (ii) for its correction.
Answer: • As the student is unable to see clearly the words written on the blackboard at a distance of 4 m, the student is suffering from myopia or near-sightedness.
• This defect is corrected by using spectacles fitted with concave lens of suitable focal length is used.
The image is allowed to form at the retina by using a concave lens of suitable power.

Question. (a) Write the function of each of the following parts of human eye: cornea; iris; crystalline lens; ciliary muscles
(b) Millions of people of the developing countries of the world 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. 
Answer: (a) Functions of the following parts of human eye:
(i) Cornea. The front part of the eye is called cornea. It is made up of a transparent substance. The light coming from objects enters the eye through cornea.
(ii) Iris. This is a flat, coloured, ring-shaped membrane behind the cornea. Pupil is a hole in the middle of the iris. Iris controls the size of the pupil.
(iii) Crystalline lens. Eye lens is a convex lens which focuses the image of the object on the retina.
(iv) Ciliary muscles. Ciliary muscles hold the eye lens and changes the thickness of eye-lens while focussing the objects placed at different distances from the eye.
(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) • One pair of eyes can give eyesight to two corneal blind persons (each getting one eye), and make them see this beautiful world.
• 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.

Question. What is atmospheric refraction? Use this phenomenon to explain the following natural events.
(a) Advanced sun-rise and delayed sun-set
Answer: Atmospheric refraction. The refraction of light caused by the earth’s atmosphere having air layers of varying optical densities is called atmospheric refraction.
(a) Advanced sun-rise and delayed sun-set. The Sun can be seen about two minutes before sunrise because when the Sun is slightly below the horizon, the Sun’s light coming from less dense air to more dense air is refracted downwards as it passes through the atmosphere. Thus due to this atmospheric refraction, the Sun appears to be raised above the horizon when actually it is slightly below the horizon.
It is also due to atmospheric refraction that we can still see the sun for about 2 minutes even after the Sun has set below the horizon. At sunset, the apparent position of the sun is visible to us and not the actual position because of the bending of light rays effect.
So, the time from sunrise to sunset is lengthened by about 2 + 2 = 4 minutes because of atmospheric refraction.

Question. What is meant by scattering of light? Use this phenomenon to explain why the clear sky appears blue or the sun appears reddish at sunrise. 
Answer: Scattering of light is the phenomenon to throw light in various random directions. Light is scattered when it falls on various types of suspended particles in its path. The colour of the scattered light depends on the size of the scattering particles in the atmosphere.
— The larger particles of dust and water droplets present in the atmosphere scatter the light of longer wavelengths due to which the scattered light appears white.
— The extremely minute particles such as air molecules present in the atmosphere scatter mainly blue light present in the white sunlight.
Colour of the sky appears blue. The molecules of air and other fine particles in the atmosphere have a size smaller than the wavelength of visible light. So these particles scatter more effectively the light rays of shorter wavelength at the blue end than light of longer wavelength at the red end. When the scattered blue light enters our eyes, it gives us the feeling of a blue sky. Colour of the sun appears red at sunrise and sunset. The sun at sunrise and sunset is very near to the horizon, and near the horizon most of the blue light of shorter wave-lengths is scattered away by the particles in the atmosphere. Therefore, the light that reaches our eyes is of longer wavelengths that gives rise to the reddish appearance of the sun.

Question. Write the importance of ciliary muscles in the human eye. Name the defect of vision that arises due to gradual weakening of the ciliary muscles in old age. What type of lenses are required by the persons suffering from this defect to see the objects clearly?
Akshay, sitting in the last row in his class, could not see clearly the words written on the blackboard. When the teacher noticed it, he announced if any student sitting in the front row could volunteer to exchange his seat with Akshay. Salman immediately agreed to exchange his seat with Akshay. He could now see the words written on the blackboard clearly. The teacher thought it fit to send the message to Akshay’s parents advising them to get his eyesight checked. In the context of the above event, answer the following questions: 
Which defect of vision is Akshay suffering from? Which type of lens is used to correct this defect?
Answer: Importance of ciliary muscles. The focal length of eye lens can be changed by changing its shape by the action of ciliary muscles. Ciliary muscles modify the curvature of the eye lens to enable the eye to focus objects at varying distances. In old age, ciliary muscles become weak and the eye lens become inflexible. As a result, the eye loses its power of accommodation. Because of this, an old person cannot see the nearby objects clearly. This leads to the defect called presbyopia. Bifocal lenses are required by the persons suffering from presbyopia in which upper part consists of a concave lens for distant vision and the lower part consists of a convex lens used to see nearby objects.
Akshay is suffering from myopia or near sightedness. Myopia is corrected by using spectacles containing concave lenses. The concave lens used for correcting myopia should be of such a focal length that it produces a virtual image of the distant object (lying at infinity) at the far point of the myopic eye.

 
 
Click below to download practice worksheet for CBSE Class 10 Physics The Human Eye and The Colorful World  Worksheet Set B
 
Chapter 06 Life Processes
CBSE Class 10 Biology Excretion Set A
CBSE Class 10 Biology Excretion Set B
CBSE Class 10 Biology Excretion Set C
CBSE Class 10 Biology Heterotrophic Nutrition Worksheet Set A
CBSE Class 10 Biology Heterotrophic Nutrition Worksheet Set B
CBSE Class 10 Biology Life Processes Nutrition In Animals Worksheet
CBSE Class 10 Biology Life Processes Nutrition In Plants Worksheet
CBSE Class 10 Biology Life Processes Nutrition Worksheet Set A
CBSE Class 10 Biology Life Processes Nutrition Worksheet Set B
CBSE Class 10 Biology Life Processes Nutrition Worksheet Set C
CBSE Class 10 Biology Life Processes Nutrition Worksheet Set D
CBSE Class 10 Biology Life Processes Reference Materials Worksheet
CBSE Class 10 Biology Life Processes Respiration In Animals Worksheet
CBSE Class 10 Biology Life Processes Respiration Worksheet Set A
CBSE Class 10 Biology Life Processes Respiration Worksheet Set B
CBSE Class 10 Biology Life Processes Respiration Worksheet Set C
CBSE Class 10 Biology Life Processes Respiration Worksheet Set D
CBSE Class 10 Biology Life Processes Transporation Worksheet Set A
CBSE Class 10 Biology Life Processes Transporation Worksheet Set B
CBSE Class 10 Biology Life Processes Transporation Worksheet Set C
CBSE Class 10 Biology Life Processes Transporation Worksheet Set D
CBSE Class 10 Biology Life Processes Worksheet
CBSE Class 10 Biology Life Processes Worksheet Set A
CBSE Class 10 Biology Life Processes Worksheet Set B
CBSE Class 10 Biology Life Processes Worksheet Set C
CBSE Class 10 Biology Life Processes Worksheet Set D
CBSE Class 10 Biology Life Processes Worksheet Set E
Chapter 09 Heredity and Evolution
CBSE Class 10 Biology Heredity And Evolution Set D
Chapter 13 Magnetic Effects of Electric Current
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