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91. Which metal is extracted from sea water?
  A.  Potassium
  B.  Aluminium
  C.  Magnesium
  D.  Beryllium
     
   
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92. Percenage of carbon in steel ranges from
  A.  4.5 to 5.0%
  B.  3.5 to 4.5%
  C.  1.5 ot 3.5%
  D.  0.1 to 1.5%
     
   
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93. Helium gas is used in gas baloons instead of hydrogen gas because it is
  A.  non -combustible
  B.  more abudant than hydrogen
  C.  Lighter than hydrogen
  D.  more stable
     
   
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94. Ruby and sapphire are oxides of
  A.  copper
  B.  aluminium
  C.  iron
  D.  tin
     
   
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95. The gas which turns into liquid at the lowest temperature among the following is
  A.  nitrogen
  B.  oxygen
  C.  helium
  D.  hydrogen
     
   
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96. In nuclear reactors,graphite is used as a/an
  A.  moderator
  B.  lubricant
  C.  fuel
  D.  insulator
     
   
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97. Sea water can be purified by the process of
  A.  filtration
  B.  evaporation
  C.  distillation
  D.  fractional distillation
     
   
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98. The compound to which h2 does not add is
  A.  Biphenyl ethylene
  B.  Tetraphenyl ethylene
  C.  Tetra-a- naphthyethylene
  D.  Tetra-9-phenanthrylethylene
     
   
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99. Ammonial is a mixture of
  A.  aluminium powder and potasium nitrate
  B.  aluminium powder and ammonium chloride
  C.  aluminium powder and ammonium sulphate
  D.  aluminium powder and ammonium nitrate
     
   
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100. Candle is a mixture
  A.  Higher fatty acids
  B.  Bees wax and stearic acid
  C.  Paraffin wax and stearic acid
  D.  Bees wax and paraffin wax
     
   
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