Olympiad – Class X – Science - Phy - The Human Eye and the Colourful World

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Question - 1

Which of the following colours combine in different proportions to form all the colours of light that we see around us?
i. Red
iii. Blue
ii. Green
iv. Yellow

  • A
  • B
  • C
  • D

Question - 2

How long does the impression of an image remain on the human brain?

  • A 1/4th to 1/8th of a second
  • B 1/16th to 1/20th of a second
  • C 1/20th to 1/24th of a second
  • D 1/6th to 1/1Oth of a second

Question - 3

What is the average refractive index of the material of the lens in our eyes?

  • A 1.396
  • B 1.196
  • C 1.296
  • D 1.496

Question - 4

Which of the following can correct the refractive defects in human eyes?

  • A Contact lenses
  • B Laser treatment
  • C Spectacles
  • D All of the above

Question - 5

Which of the following is/are the primary function(s) of the human eyes?

  • A It makes adjustments to allow appropriate amount of light into the eyes
  • B It bends the light rays to form a sharp image.
  • C It collects and sends information to the brain for further processing
  • D All of the above

Question - 6

The blind spot on the retina has

  • A numerous nerve endings
  • B no nerve endings
  • C few nerve endings
  • D nerve endings which increase in number as age advances.

Question - 7

A man suffering from myopia cannot see the objects distinctly at a distance greater than 2 m.Which lens is required to correct the defect?

  • A -2 D
  • B +2 D
  • C -0.5 D
  • D +0.5 D

Question - 8

How is myopia caused in human beings?

  • A Due to old age
  • B Due to a change in focal length
  • C Due to the shortening of the eye ball
  • D Due to the elongation of the eye ball

Question - 9

What does the colour of a star indicate?

  • A It's weight
  • B It's distance
  • C It's temperature
  • D It's size

Question - 10

Which colour of light travels with a minimum speed in glass?

  • A Blue
  • B Green
  • C Violet
  • D Red