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Human Eye and Colourful World Test - 17

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Human Eye and Colourful World Test - 17
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Weekly Quiz Competition
  • Question 1
    1 / -0

    A student sitting on the last bench can read the letters written on the blackboard but is not able to read the letters written in his text book. Which of the following statements is correct?

    Solution

    In hypermetropia the near point of eye moves away from 25cm. Due to this, the person needs to keep a book at more than 25 cm to read it properly.

     

  • Question 2
    1 / -0

    At noon the sun appears white as

    Solution

    Sky will appear dark in case of option ‘a’. It will appear blue in case of option ‘c’ and will appear red in case of option ‘d’.

     

  • Question 3
    1 / -0

    Which of the following phenomena of light are involved in the formation of a rainbow?

    Solution

    Dispersion results in white light getting segregated into its component colours. Refraction bends the incident light to an angle that is causes internal reflection; and finally rainbow is formed.

     

  • Question 4
    1 / -0

    Twinkling of stars is due to atmospheric

    Solution

    Due to refraction of light by different layers of varying refractive indices, the apparent position of source of light keeps on changing. Due to this, stars appear to twinkle.

     

  • Question 5
    1 / -0

    The clear sky appears blue because

    Solution

    Violet and blue light get scattered more than lights of all other colours by the atmosphere

     

  • Question 6
    1 / -0

    Which of the following statements is correct regarding the propagation of light of different colours of white light in air?

    Solution

    Since the refractive index of air is 1, so all the colours of the white light move with the same speed.

     

  • Question 7
    1 / -0

    The danger signals installed at the top of tall buildings are red in colour. These can be easily seen from a distance because among all other colours, the red light

    Solution

    Red light is scattered the least by smoke or fog.

     

  • Question 8
    1 / -0

    Which of the following phenomena contributes significantly to the reddish appearance of the sun at sunrise or sunset?

    Solution

    Red colour scatters the least and hence travels the farthest. During sunset or sunrise, light has to travel a longer distance to reach us. Hence, only red light reaches to us and the sky appears reddish.

     

  • Question 9
    1 / -0

    The bluish colour of water in deep sea is due to

    Solution

    Water is colourless. Its colour appears to be same as the object reflected by it

     

  • Question 10
    1 / -0

    When light rays enter the eye, most of the refraction occurs at the

  • Question 11
    1 / -0

    The focal length of the eye lens increases when eye muscles

    Solution

    Ciliary muscles relaxes which increases the focal length of eye lens.

     

  • Question 12
    1 / -0

    Which of the following statement is correct?

    Solution

    This is the reason; myopia is also known as near sightedness.

     

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