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Light Test - 22

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Light Test - 22
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  • Question 1
    1 / -0
    Which of the following is not included under optical aids?
    Solution
    Optical aids are instruments that are used for improving vision. Optical aids include bifocal lenses, contact lenses, tinted lenses, magnifiers etc. 

    Hence, options A,B,C all are included under optical aids.
    So, the correct option is D.

  • Question 2
    1 / -0
    Braille system is categorized under:
    Solution
    Non optical aids include tactual aids and auditory aids. Tactual aids use sense of touch. Braille system is a kind of tactual aid.

  • Question 3
    1 / -0
    Braille system is commonly used for:
    Solution
    Braille system is used for mathematics, scientific notations, and languages. It makes up the letters of alphabets, numbers, punctuation marks, etc.

  • Question 4
    1 / -0
    The most effective resource for visually challenged person is _______ .
    Solution
    Telescopic  aids or lenses can help to correct the vision or are used to rectify visual limitations. While Braille system can be used for visually challenged persons to read and write.
  • Question 5
    1 / -0
    Read the statements and mark the correct one about the braille system:
    i. It has 63 dot patterns, and 64 characters including word space
    ii. through Braille system, visually challenged people can only read the languages.
    iii. It is a coded language based on logical system
    Solution
    Many languages(foreign,Indian )can be read using the Braille system. Braille system has 63 dot patterns or characters. Each character represents a letter, a combination of letters, a common word or a grammatical sign. A possible combination is no dots at all, which makes up for word space.
  • Question 6
    1 / -0
    The present system of Braille was adopted in :
    Solution
    Braille system was published in 1821 and present system of Braille was adopted in 1932.
  • Question 7
    1 / -0
    When was Braille system first published?
    Solution
    Braille system developed by Louis Braille was published in 1821.
  • Question 8
    1 / -0
    Braille system is used for :
    Solution
    Braille system is used by visually challenged people for reading and writing. Braille characters are embossed in lines on paper and read by passing the fingers lightly over the manuscript.
  • Question 9
    1 / -0
    If the light entering a kaleidoscope be green in colour, will there be any change in the pattern?
    Solution
    The pattern created inside a kaleidoscope depends on multiple reflections of the light. The reflection of light does not depend on its colour. Hence the pattern has nothing to do with the colour of the light.
  • Question 10
    1 / -0
    Reflection can occur on
    Solution
    When light rays strike the surface of a material, there are two possible things that may be possible.
    i) Apart from the part that is absorbed, most of the light rays are reflected completely and no light ray passes through the material. This happens when the material is opaque.
    ii) The light rays are partially reflected, partially refracted, and partially absorbed when the material is translucent and transparent.
    Therefore, reflection occurs whenever the light rays strike a surface, be it transparent, translucent or opaque.
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