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16.
Optical fiber works on the principle of
  • A.
    total internal reflection
  • C.
    scattering
  • B.
    refraction
  • D.
    interference
  • Answer
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Answer : [A]
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17.
Cryogenic engines find application in
  • A.
    sub-marine propulsion
  • C.
    rocket technology
  • B.
    frost - free refrigerators
  • D.
    researches in superconductivity
  • Answer
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Answer : [C]
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18.
Domestic electric wiring is basically a
  • A.
    series connection
  • B.
    Parallel connection
  • C.
    combination of series and parallel connections
  • D.
    series connection within each room and parallel connection elsewhere
  • Answer
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Answer : [C]
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19.
Total internal reflection can take place when light travels from
  • A.
    Diamond to glass
  • C.
    Air to water
  • B.
    Water to glass
  • D.
    Air to glass
  • Answer
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Answer : [A]
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20.
A simple machine helps a person in doing
  • A.
    Less work
  • C.
    The same amount of work slowly
  • B.
    The same amount of work with lesser force
  • D.
    The same amount of work much faster
  • Answer
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Answer : [B]
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