CBSE Questions for Class 10 Physics Human Eye And Colorful World Quiz 9 - MCQExams.com

For a normal eye, the far point is at infinity and the near point of distinct vision is about $$25\ cm$$ in front of the eye. The cornea of the eye provides a converging power of about $$40$$ dioptres, and the least converging power of the eye - lens behind the cornea is about $$20$$ dioptres. From this rough data estimate the range of accommodation (i.e., the range of converging power of the eye-lens) of a normal eye.
  • $$10$$ to $$14\ D$$
  • $$20$$ to $$24\ D$$
  • $$28$$ to $$32\ D$$
  • $$14$$ to $$18\ D$$
The muscles of a normal eye are least strained when the eye is focused on an object .....
  • Far away from the eye 
  • Very close to the eye 
  • At about $$25$$ cm from the eye 
  • At about $$1$$ m from the eye 
Assertion: Blue colour of sky appears due to scattering of blue colour.
Reason: Blue colour has shortest wave length in visible spectrum.
  •  both assertion and reason are true and reason is the correct explanation of assertion
  •  both assertion and reason are true but the reason is not the correct explanation of assertion
  •  assertion is true but reason is false
  •  both the assertion and reason are false
  •  reason is true but assertion is false
Assertion: The setting sun appears to be red.
Reason: The scattering of light is directly proportional to the wavelength.
  • Both assertion and reason are true but the reason is the correct explanation of the assertion
  • Both assertion and reason are true but the reason is not the correct explanation of the assertion
  • Assertion is true but reason is false
  • Both the assertion and reason are false
  • Reason is true but assertion is false
Near point of an eye suffering from long-sightedness is:
  • less than 25cm
  • greater than 25cm
  • equal to 25cm
  • infinity
The sun appears red at the time of sun-rise and sun-set. This is because:
  • red colour is least scattered
  • red colour is most scattered
  • the sun is red in colour
  • our eyes can sense only red colour
Sky appears to be blue in clear atmosphere due to which property of light.
  • Scattering
  • Polarization
  • Diffraction
  • Dispersion
When white light is passed through two consecutive prisms, the resultant will be:
  • rainbow colors
  • white beam
  • no light
  • yellow light

The sky appears blue due to:

  • reflection of light
  • dispersion and scattering of light
  • total internal reflection of light
  • blue colour of water droplets
Match the columns:
i. convex lens    a. presbyopia
ii. concave lensb. cataract
iii. Artificial lensc. myopia
iv. focal lensd. hypermetropia
  • i-c,ii-d,iii-a,iv-b
  • i-d,ii-c,iii-b,iv-a
  • i-b,ii-c,iii-a,iv-d
  • i-a,ii-b-iii-d,iv-c
The refractive defects of the eye can be corrected by _____ :
  • Eye glasses
  • contact lenses
  • Surgical procedures
  • All of the above
Match the items in list-I with items in list-II and collect the correct answers from the codes given below the lists:
List-IList-II
I. MyopiaA. Bifocal lens
II. Hyper-metropiaB. Cylindrical lens
III. PresbyopiaC. Concave lens
IV. AstigmationD. Convex lens
  • I-D, II-C, III-A, IV-B
  • I-C,11-D,III-A, IV-B
  • I-B, II-D, III-A, IV-C
  • I-A, II-B, III-C, IV-D
Sodium lamps are used in foggy conditions because:
  • yellow light is scattered less by the fog particles
  • yellow light is scattered more by' the fog particles
  • yellow light is unaffected during its passage through the fog
  • Wavelength of yellow light is the mean of the visible part of the spectrum
A defect of vision caused due to excessive curvature of the cornea is:
  • myopia
  • hypermetropia
  • astigmatism
  • presbyopia
A person who is near sighted will have the most trouble reading
  • a newspaper in his hands
  • a mobile screen in front of him
  • a street sign across the street
  • the menu in a restaurant
If a person can see an object clearly when it is placed at about $$25 cm$$ away from him, he is suffering from:
  • astigmatism
  • none of these
  • myopia
  • hypermetropia
Long sightedness happens as:
  • ciliary muscles tighten
  • ciliary muscles weaken
  • eyeball size does not change
  • all the above happen
Bi-focal lens is required to correct:
  • cataract
  • astigmatism
  • myopia
  • presbyopia
A girl viewed an object and found that it is not clearly visible to her. It was found that the image was formed by her eye lens $$3cm$$ away from the pupil of her eyes.The girl can correct this defect by using a:
  • concave lens
  • convex lens
  • bi-focal lens
  • plano-convex lens
What is the black circular aperture in our eyes and why does it appear black?
  • The aperture is known as iris and it appears black as no light is reflected from it.
  • The aperture is known as the pupil and it appears black as all light is reflected from it.
  • The aperture is known as iris and it appears black as all light is reflected from it.
  • The aperture is known as the pupil and it appears black as no light is reflected from it.
Which of the following is not true for the eye lens?
  • It is composed of a fibrous, jelly-like material.
  • Its curvature can be modified to some extent by the ciliary muscles.
  • When the muscles are relaxed, the lens becomes thin.
  • When the muscles are relaxed, the lens becomes thick.
Match the columns
i. amount of light entering into eye controlled bya. rodes 
ii. colour sensing cells b. cones
iii.cells helping in vision in dim lightc. iris
iv. junction of optic nerve and retina d. blindspot
  • i-a,ii-b,iii-c,iv-d
  • i-d,ii-c,iii-b-iv-a
  • i-c,ii-b,iii-a,iv-d
  • i-b,ii-a,iii-c,iv-b
Fill up the blanks:
a) light sensitive screen of human eye..............
b) near sightedness is corrected by..................
c) hypermetropia is corrected by.................
d) range of vision for a normal eye............
  • a. retina
    b. concave lens
    c. convex lens
    d. $$25cm-$$infinity
  • a. cornea
    b. convex lens
    c. concave lens
    d. $$0-25cm$$
  • a. iris
    b. converging lens
    c. diverging lens
    d. $$0-$$infinity
  • a. sclera
    b. diverging lens
    c convex lens
    d. infinity
Which colour of light is scattered by very large particles?
  • Blue
  • Violet
  • Indigo
  • White
Fill in the blanks:
For a human eye lens, for nearby objects, focal length ____  while for far away objects  focal length ____ .
  • remains the same, decreases
  • increases, decreases
  • decreases, increases
  • increases, remains the same
Match the following
List IList II
1Adjustment of focal lengthaAccommodation
2Least distance of distinct visionbInfinity
3Farthest point of visibilityc25 cm
4Vision impairmentdCataract
  • 1-b, 2-c, 3-a, 4-d
  • 1-d, 2-c, 3-b, 4-a
  • 1-a, 2-c, 3-b, 4-d
  • 1-c, 2-a, 3-d, 4-b
Match the following
List IList II
1Change in curvaturea25 cm
2Relaxed ciliary musclesbCurvature of the lens decreases
3Thick lenscChange in focal length
4Near pointdFocal length increases
  • 1-b, 2-c, 3-a, 4-d
  • 1-c, 2-d, 3-b, 4-a
  • 1-a, 2-c, 3-b, 4-d
  • 1-c, 2-a, 3-d, 4-b
The minimum distance at which objects can be seen without any strain is 
  • $$25\ cm$$
  • Near point
  • Least distance of distinct vision
  • All of the above
The refractive defects of vision are
a. Myopia                     b. Cataract
c. Hypermetropia        d. Presbyopia
  • a and b
  • a, c and d
  • b and c
  • All of the above
Myopia can be corrected by using a _____.
  • Converging lens
  • Bifocal lens
  • Diverging lens
  • None of the above
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