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

Which of the following adjustments are made by the eye to enable the clear vision of distant objects?
  • Relaxation of ciliary muscles
  • Thinning of the eye lens
  • Increasing the focal length
  • All of the above
Match the following:

List IList II
1MyopiaaCorrects far vision
2HypermetropiabWeakening of ciliary muscles
3PresbyopiacCorrects near vision
4Concave lensdNear sightedness
5Convex lenseFar sightedness
  • 1-b, 2-c, 3-a, 4-d, 5-e
  • 1-d, 2-e, 3-b, 4-a, 5-c
  • 1-a, 2-c, 3-e, 4-d, 5-b
  • 1-c, 2-e, 3-d, 4-b, 5-a
Match the following
List IList II
1Aqueous humouraForms inverted image on the retina
2Vitreous humourbSpherical
3EyeballcPresent between lens and retina
4Crystalline lensdPresent between lens and cornea
  • 1-b, 2-c, 3-a, 4-d
  • 1-d, 2-c, 3-b, 4-a
  • 1-d, 2-a, 3-c, 4-b
  • 1-a, 2-d, 3-b, 4-c
Larger particles scatter light at the ____ end of the spectrum.
  • Blue
  • Green
  • Violet
  • Red
Myopia may arise due to ____ .

a. Elongation of eyeball
b. Shrinking of the eyeball
c. Long focal length of the eye
d. Increased curvature of the eye lens
  • a and b
  • b and c
  • c and d
  • a and d
Hypermetropia may arise due to _____:
a. Shrinking of the eyeball.
b. Elongation of eyeball.
c. Long focal length of the eye.
d. Excessive curvature of the eye lens.
  • b and c
  • a and c
  • a and d
  • b and d
Which of the following statements are true for presbyopia?
  • Decreased power of accommodation
  • Weak ciliary muscles and reduced flexibility of eye lens
  • Usually occurs with increasing age
  • All of the above
Why do high rise buildings have a red light on the top of the building?
  • Red light is the least scattered by fine particles
  • Red light can be easily spotted by the pilot
  • Both A and B
  • None 
The condition occurring due to gradual decrease in power of accommodation because of ageing is called ____ .
  • Near-sightedness
  • Hypermetropia
  • Presbyopia
  • Cataract
How does concave lens correct myopia?
  • Increases the curvature of the eye lens
  • Forms the image of the object at the retina
  • Decreases the elongation of the eyeball
  • All of the above
Which of the following statements are true for hypermetropia?
a. The near point is farther away from 25cm.
b. The image of the object is formed behind the retina.
c. It arises due to decreased power of accommodation.
d. It can be corrected by the diverging lens.
  • $$b$$ and $$c$$
  • $$c$$ and $$d$$
  • $$a$$ and $$b$$
  • $$a$$ and $$d$$
The following conditions are seen in which defect of vision?
a. The vision is clear up to a distance of few meters
b. It may occur due to elongation of eyeball
c. The image of the object is formed in front of the retina
  • Myopia
  • Cataract
  • Presbyopia
  • Hypermetropia
Presbyopia can be corrected with the help of _____ .
  • Bifocal lens
  • Diverging lens
  • Convex lens
  • All of the above
Why does sun appear reddish at sunrise and sunset?
  • Near the horizon it passes through thick layers of atmosphere having larger particles
  • Sunlight travels longer distance at sunrise and sunset
  • Both A and B
  • None of the above
The phenomenon of scattering of light by fine particles is called _____ :
  • Snell's law
  • Dispersion effect
  • Law of refraction
  • Tyndall effect
The phenomenon of dispersion proves that:
  • white light is made up of seven constituent colours
  • light moves in a straight line
  • light passes through a transparent medium
  • light does not pass through an opaque medium and absence of light causes shadow
Very fine particles mainly scatter _____ light.
  • Blue
  • White
  • Red
  • Violet
During dispersion through prism, red light travels fastest and violet travels slowest of all the seven colours. As a result:
  • red bends the least and violet bends the most
  • red bends the most and violet bends the least
  • both red and violet bend the least of all colours
  • both red and violet bend the most of all colours
In the context of scattering
Fine particles : ____ wavelength : : large particles : _____ wavelength
  • Long, short
  • Short, long
  • Visible, infrared
  • None of these
Which of the following are examples of scattering of light?
  • Blue color of the sky
  • Reddening of the sun at sunrise and sunset
  • Color of water in deep seas and oceans
  • All of the above
The color of scattered light depends on ____ of the scattering particles.
  • shape
  • material
  • size
  • all of the above
Why does the sky appear blue?
  • The color of water is reflected on the sky
  • Fine particles in the atmosphere scatter light of shorter wavelength
  • The water molecules in the atmosphere makes the sky appear blue
  • None of these
Maximum and minimum scattering in visible range are respectively:
  • Violet and red
  • Red and violet
  • Blue and green
  • None of the above
Very fine particles scatter:
  • Blue light
  • Red light
  • Green light
  • White Light
Scattering of light is defined as:
  • Splitting of light into its component colours
  • Deflection of light in different directions when light is incident on extremely small particles
  • Bending of light on change of medium
  • reversal of light direction from a shiny surface
Why are danger signals Red Coloured
  • Human eye is most sensitive to red colour
  • Red light is scattered most by the atmosphere
  • Red light is scattered least by the atmosphere
  • Red is a terrifying colour
In a beaker containing colloidal solution of sodium thiosulphate and a drop of con. sulphuric acid, light observed from side of beaker is:
  • Blue
  • Red
  • Green
  • Yellow
Alternate inverted prisms are placed in series. Choose correct options.
  • Even number of prisms does not produce a spectrum
  • Odd number of prisms produce a spectrum
  • More the number of prisms, less is the intensity of emergent ray/spectrum
  • All of above
Why astronauts see dark sky in space unlike blue sky on earth:
  • There is no day in space
  • Light is not scattered in space since there are no particles present
  • Light is reflected back from the body of the astronaut
  • Light is absorbed by the space
Why sky appears reddish orange at sunrise or sunset?
  • Sunlight suffers dispersion and only reddish light reach our eyes
  • Sunlight experiences different degree of refraction due to change in density during night
  • Sunlight has to travel longer path and blue light is scattered away, while red and yellow light is scattered least
  • The reflection of earth's surface from horizon produces reddish orange colour
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