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16.
Optical fiber works on the principle of
- A.total internal reflection
- C.scattering
- B.refraction
- D.interference
- Answer
- Report
Answer : [A]
17.
Cryogenic engines find application in
- A.sub-marine propulsion
- C.rocket technology
- B.frost - free refrigerators
- D.researches in superconductivity
- Answer
- Report
Answer : [C]
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
- Report
Answer : [C]
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
- Report
Answer : [A]
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
- Report
Answer : [B]
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