General Science Gk Questions

DIRECTIONS : Objective Question on General Science.
11. The hardest substance available on earth is
  A.  Platinum
  B.  Diamond
  C.  Coal
  D.  Gold
12. The average salinity of sea water is
  A.  20%
  B.  25%
  C.  30%
  D.  35%
13. Quartz crystals normally used in quartz clocks etc is chemically
  A.  Germanium oxide
  B.  Silicon dioxide
  C.  Sodium silicate
  D.  Carbon dioxide
14. The hydraulic brakes used in automobiles is a direct application of
  A.  Toricellian law
  B.  Archimedes principle
  C.  Bernoulli's theorem
  D.  Pascal's law
15. Nuclear fission is caused by the impact of
  A.  Proton
  B.  Electron
  C.  Neutron
  D.  Both A and B
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