Physics

physics questions
DIRECTIONS : Questions based on Physics.
21. Optic fibres are mainly used for which of the following ?
  A.  Communication
  B.  Weaving
  C.  Musical instruments
  D.  Food industry
22. Who invented Bakelite?
  A. Charles Goodyear
  B. Leo Hendrik Baekeland
  C. Roy Plunkett
  D. Henry Ford

23. Rocket engine works on the principle of
  A.  Newtons third law
  B.  Newtons first law
  C.  Newtons second law
  D.  None of these.
24. Cyrogenic engines find application in
  A.  Rocket technology
  B.  Frost free refrigerators
  C.  Sub-marine propulsion
  D.  researches in superconductivity
25. The best and the poorest conductors of heat are respectively
  A.  Silver(AG) and lead(PB)
  B.  Copper(CU)andaluminium(AL)
  C.  Silver(AG)andgold(AU)
  D.  Copper(CU)andgold(AU)
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