Physics General Knowledge Questions and Answers

17. A device used to measure current is
  A.  Ammeter
  B.  Altimeter
  C.  Barometer
  D.  Galvanometer
Answer
Ans: A
Ammeter
18. What is the unit for measuring the pitch or frequency of sound?
  A.  Decible
  B.  Coulomb
  C.  Cycles
  D.  Hum
Answer
Ans: A
Decible
19. Which of the following is used as a moderator in nuclear reactor?
  A.  Graphite
  B.  Radium
  C.  Thorium
  D.  Ordinary water
Answer
Ans: A
Graphite
20. The light is a
  A.  Longitudinal wave
  B.  Transverse wave
  C.  Both
  D.  None of these
Answer
Ans: B
Transverse wave
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