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Human Eye and Colourful World Test - 24

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Human Eye and Colourful World Test - 24
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Weekly Quiz Competition
  • Question 1
    1 / -0
    Transparent front part of eye is:
    Solution
    Light enters the eye through a curved front surface known as cornea. It is transparent in nature.
  • Question 2
    1 / -0
    What are the changes in ciliary muscle when nearby objects and distant objects are viewed?
    Solution
    The change in the curvature of the eye lens can thus change its focal length. When the muscles are relaxed, the lens becomes thin. Thus, its focal length increases. This enables us to see distant objects clearly. When you are looking at objects closer to the eye, the ciliary muscles contract. This increases the curvature of the eye lens. The eye lens then becomes thicker. Consequently, the focal length of the eye lens decreases. This enables us to see nearby objects clearly. 
  • Question 3
    1 / -0
    The part of human eye which is sensitive to red, blue and green light is:
    Solution
    The retina is the screen of an eye. Photo-receptors like rods and cones are present on the retina. So it is sensitive to different colors.
  • Question 4
    1 / -0
    Aqueous humour is a _________ and  vitreous humour is a _________.
    Solution
    The space between the cornea and the eye lens is filled with a viscous liquid called aqueous humor and the space between the eye lens and retina contains a transparent jelly called vitreous humor, thus option $$D$$ is correct.
  • Question 5
    1 / -0
    Shape of eye ball is:
    Solution
    Human eyeball is spherical in shape. Its diameter is varies as $$2.1 \ cm-2.7 \ cm$$, hence option $$B$$ is correct.

  • Question 6
    1 / -0
    Which part of eye is responsible for its characteristic colour
    Solution
    Iris may be pigmented and is thus responsible for the characteristic colour of the eye, hence option $$B$$ is correct.
  • Question 7
    1 / -0
    The power of accommodation is achieved by by changing:
    Solution
    By changing the curvature of the lens and its focal length, the image of nearby or distant objects can be made to form on the retina. This is called the power of accommodation.
  • Question 8
    1 / -0
    Variable focal length of eye is responsible for:
    Solution
    Power of accommodation of human eye is the ability of the eye to observe distinctly the objects situated at widely different distances from the eye. This is made possible by the adjustment of the focal length of the eye lens by the action of ciliary muscles holding the lens.
  • Question 9
    1 / -0
    Image forming light sensitive screen of the eye is known as __________ and it contains __________.
    Solution
    The lens of the eye forms a real, inverted image of the object on the inner coat of the eye. The screen of eye is called the retina. It is a delicate membrane having enormous number of light sensitive cells or photo-receptors, i.e rod and cone cells. 
  • Question 10
    1 / -0
    What is the function of aqueous humour?
    Solution
    Aqueous humour is present between cornea and eye lens. It keeps the cornea moist and maintains the shape of eye ball.
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