Geography General knowledge Questions

DIRECTIONS : Objective Question on Geography.
13. The Grand Canyon is located on the
  A.  Niger River
  B.  Rhine River
  C.  Tapi River
  D.  Colorado River
14. Where are extensive prairies situated?
  A.  Australia
  B.  South America
  C.  Central America
  D.  North America
15. Diamond is chemically
  A.  Pure carbon
  B.  A mixture of calcium and magnesium phosphates
  C.  A pure form of sand
  D.  A mixture of metal carbonates
16. Which of the following is the strongest force?
  A.  Nuclear force
  B.  Electromagnetic forces
  C.  Atomic force
  D.  Gravitational forces
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