chemistry based questions
DIRECTIONS : Questions based on Chemistry.
51. A polymeric substance used to make parachute is
  A.  Rayon
  B.  Viscose
  C.  Cotton
  D.  Terylene
52. Carbon occurs in nature in the purest form as
  A.  Diamond
  B.  Graphite
  C.  Carbon black
  D.  Coal

53. Which of the following substance is highly plastic?
  A.  Quartz
  B.  Mica
  C.  Clay
  D.  Granite
54. Which one among the following is used as a moderator in nuclear reactors?
  A.  Ozone
  B.  Heavy hydrogen
  C.  Heavy water
  D.  Hydrogen peroxide
55. Who discovered radioactivity?
  A.  Marie Curie
  B.  Roentgen
  C.  John Dalton
  D.  Henri Becquerel