General Science Gk Questions

DIRECTIONS : Objective Question on General Science.
21. How many colours the sunlight spectrum has?
  A.  3
  B.  4
  C.  5
  D.  7
22. Bar is the unit of
  A.  Current
  B.  Heat
  C.  Temperature
  D.  Atmospheric pressure
23. The group of metals Fe, Co, Ni may be the best called as
  A.  Rare metals
  B.  Alkaline metals
  C.  Main group metals
  D.  Transition metals
24. The tape of a tape recorder is coated with
  A.  Ferromagnetic powder
  B.  Mica
  C.  Zinc oxide
  D.  Copper sulphate
25. Which of the following is the fastest storing input/output device in a computer?
  A.  Magnetic floppy disc
  B.  Teletype writer
  C.  Teletype writer
  D.  None of these
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