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SCIENCE (X) THE HUMAN EYE AND THE COLOURFUL WORLD |
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MULTIPLE CHOICE QUESTIONS
(MCQs) |
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1 |
The apparent flattening of the Sun's disc at sunrise and sunset is
due to (a) dispersion of light (b) scattering of light (c) atmospheric refraction of light (d) tyndall effect. |
1 |
|
2 |
Blue colour of clear sky is due to (a) refraction of light (b) reflection of light (c) absorption of light (d) scattering of light. |
1 |
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3 |
Which of the following statements is not true for scattering of
light? (a) Colour of the scattered light depends on the size of particles of
the atmosphere. (b) Red light is least scattered in the atmosphere. (c) Scattering of light takes place as various colours of white light
travel with different speed in air. (d) The fine particles in the atmospheric air scatter the blue light
more strongly than red. So the scattered blue light enters our eyes. |
1 |
|
4 |
When a beam of white light passes through a region having very fine
dust particles, the colour of light mainly scattered in that region is (a) red (b) orange (c) blue (d) yellow |
1 |
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5 |
The phenomena of light involved in the formation of rainbow are (a) refraction, reflection and dispersion (b) refraction, dispersion and internal reflection (c) reflection, dispersion and internal reflection (d) refraction, dispersion, scattering and total internal reflection |
1 |
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6 |
When a narrow beam of white light passes through a glass prism it
splits into its component colours? This phenomenon is called (a) diffusion of light (b) total reflection of light (c) scattering of light (d) dispersion of light. |
1 |
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7 |
In human eye the part which allows light to enter into the eye is (a) Retina (b) Pupil (c) Eye lens (d) Cornea |
1 |
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8 |
The lens system of human eye forms an image on a light sensitive
screen, which is called as (a) cornea (b) ciliary muscles (c) optic nerves (d) retina |
1 |
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9 |
Person suffering from cataract has (a) elongated eyeball (b) excessive curvature of eye lens (c) weakened ciliary muscles (d) opaque eye lens. |
1 |
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10 |
When light enters the atmosphere it strikes on extremely fine
particles, which deflect the rays of light in all possible directions, this
is due to (a) reflection of light (b) atmospheric refraction (c) scattering of light (d) dispersion of light |
1 |
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ASSERTION AND REASON QUESTIONS
(a) Both Assertion (A) and
Reason (R) are true and Reason (R) is the correct explanation of the
Assertion (A). (b) Both Assertion (A) and
Reason (R) are true and Reason (R) is not the correct explanation of the
Assertion (A). (c) Assertion (A) is true, and
Reason (R) is false. (d) Assertion (A) is false,
and Reason (R) True. |
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11 |
Assertion: A beam of white light gives a spectrum on passing through
a hollow prism. Reason: Speed of light outside the prism is different as the speed of
light inside the prism. |
1 |
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12 |
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. |
1 |
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13 |
Assertion (A): Sky appears blue in the day time. Reason (R): White light is composed of seven colours. |
1 |
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14 |
Assertion (A): The rainbow is a natural spectrum of sunlight in the
sky. Reason (R): Rainbow is formed in the sky when the sun is overhead and
water droplets are also present in air. |
1 |
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VERY SHORT ANSWER QUESTIONS |
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15 |
Define the term power of accommodation. Write the modification in the
curvature of the eye lens which enables us to see the nearby objects clearly? |
2 |
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16 |
Draw a labelled diagram to show (i) dispersion of a beam of white
light and (ii) formation of a rainbow. |
2 |
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17 |
Explain why the planets do not twinkle. |
2 |
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18 |
The colour of clear sky from the earth appears blue but from the
space it appears black. Why? |
2 |
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19 |
Name the phenomenon of light responsible for Tyndall effect. Write an
event where this phenomenon can be observed. |
2 |
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SHORT ANSWER TYPE QUESTIONS |
|
20 |
Write about power of accommodation of human eye. Explain why the
image distance in the eye does not change when we change the distance of an
object from the eye? |
3 |
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21 |
Trace the sequence of events which occur when a bright light is
focused on your eyes. |
3 |
|
22 |
Differentiate between a glass slab and a glass prism. What happens when
a narrow beam of (i) a monochromatic light and (ii) white light passes through (a) glass slab and (b) glass prism? |
3 |
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23 |
Define the term dispersion of white light. State the colour which
bends (i) the most, (ii) the least while passing through a glass prism. Draw a diagram to
show the dispersion of white light. |
3 |
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24 |
What is dispersion of white light? State its cause Draw a diagram to
show dispersion of a beam of white light by a glass prism. |
3 |
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25 |
Why is Tyndall effect shown by colloidal particles? State four
instance of observing the Tyndall effect. |
3 |
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26 |
Define the term power of accommodation of human eye. What happens to
the image distance in the eye when we increase the distance of an object from
the eye? Name and explain the role of the part of human eye responsible for
it in this case. |
3 |
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LONG ANSWER TYPE QUESTIONS |
|
27 |
A student is unable to see clearly the words written on the black
board placed at a distance of approximately 3 m from him. Name the defect of
vision the boy is suffering from. State the possible causes of this defect
and explain the method of correcting it. |
5 |
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28 |
(a) What is dispersion of white light? State its cause. (b) "Rainbow is an example of dispersion of sunlight."
Justify this statement by explaining, with the help of a labelled diagram,
the formation of a rainbow in the sky. List two essential conditions for
observing a rainbow. |
5 |
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29 |
a) Why do the component colours of incident white light split into a
spectrum while passing through a glass prism? Explain. (b) Draw a labelled ray diagram to show the formation of a rainbow |
5 |
|
30 |
a) With the help of diagram explain Isaac Newton's experiment that
led to the idea that the sunlight is made up of seven colours. (b) What is atmospheric refraction? List two natural phenomena based
on atmospheric refraction. |
5 |
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31 |
Explain the structure and functioning of the human eye. How are we
able to see nearby as well as distant objects? |
5 |
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32 |
State the function of each of the following parts of the human eye: (i) Cornea (ii) Iris (iii) Pupil (iv) Retin |
5 |
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33 |
Write the function of each of the following parts of human eye: (i) Cornea (ii) Iris (iii) Crystalline lens (iv) Ciliary muscles |
5 |
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CASE BASED STUDY QUESTIONS |
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34 |
READ THE FOLLOWING PASSAGE AND
ANSWER THE FOLLOWING QUESTIONS: A student notices that the apparent position of a star appears to
twinkle while that of the planets does not. His teacher tells him that this
is due to atmospheric refraction. 1. What is atmospheric refraction? 2. Why do stars appear to twinkle but not planets? 3. Why can we see the sun a few minutes before it rises and even
after it sets? 4. Which layer of the atmosphere causes refraction of light? 5. Explain why the sun appears flattened during sunrise and sunset. |
4 |
|
35 |
READ THE FOLLOWING PASSAGE AND
ANSWER THE FOLLOWING QUESTIONS: One evening, Neha notices that the sky appears reddish-orange during
sunset. Her teacher explains that this is due to scattering of sunlight by
particles in the atmosphere. 1. What is the cause of the reddish colour of the sky during sunrise
and sunset? 2. Which colour of light is scattered the most and which the least? 3. Why does the sky appear blue during the day? 4. What would happen if there were no atmosphere? 5. Name the phenomenon responsible for the twinkling of stars. |
4 |
|
36 |
READ THE FOLLOWING PASSAGE AND
ANSWER THE FOLLOWING QUESTIONS: A student reads her book in dim light for long hours. She notices
that her vision becomes slightly blurred. The doctor tells her that her eye
muscles are strained due to improper focusing. 1. Name the part of the eye that controls the size of the pupil. 2. Which part of the eye focuses the light rays on the retina? 3. What is the function of the iris? 4. Why should we avoid reading in dim light? 5. What is the near point of a normal human eye? |
4 |
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37 |
READ THE FOLLOWING PASSAGE AND
ANSWER THE FOLLOWING QUESTIONS: A 15-year-old boy, Arjun, is unable to read the blackboard clearly
from the last bench in his class, but he can read his book easily. His eye
test report shows that the image of distant objects is formed in front of the
retina. The doctor advises him to use a lens of power –1.5 D. 1. Name the defect of vision Arjun is suffering from. 2. What is the cause of this defect? 3. Which type of lens is used to correct it? 4. What is the focal length of the lens used by Arjun? 5. Name another defect of vision and the type of lens used to correct
it. |
4 |
FOLLOW THE INSTRUCTIONS FOR DOWNLOAD THIS ASSIGNMENT:
1. SEARCH WWW.SCIENCEARENA.IN
2. OPEN EDUCATION AND RESOURCES IN MENU BAR.
3. SINGLE CLICK DOWNLOAD AVAILABLE IN DOWNLAOD SECTION.
https://www.sciencearena.in/p/education-resources.html