GENERAL KNOWLEDGE | QUIZ | PHYSICS | 5 | QUESTIONS BASED ON PHYSICS | OPTIC FIBRES ARE MAINLY USED FOR WHICH OF THE FOLLOWING ? | WHO INVENTED BAKELITE? | THE BEST AND THE POOREST CONDUCTORS OF HEAT ARE RESPECTIVELY

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
 Ans: A.

22.     Who invented Bakelite?
      A. Charles Goodyear
      B. Leo Hendrik Baekeland
      C. Roy Plunkett
      D. Henry Ford
  Ans: B.

23.     Rocket engine works on the principle of
      A.  Newtons third law
      B.  Newtons first law
      C.  Newtons second law
      D.  None of these.
  Ans: A.

24.     Cyrogenic engines find application in
      A.  Rocket technology
      B.  Frost free refrigerators
      C.  Sub-marine propulsion
      D.  researches in superconductivity
  Ans: A.

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)
 Ans: A.