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71. Which one of the following is used to restore the colour of old oil paintings?
  A.  Ozone
  B.  Hydrogen peroxide
  C.  Barium peroxide
  D.  Sodium peroxide
     
   
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72. Milk is a natural
  A.  Emulsion
  B.  Solution
  C.  Mixture
  D.  Suspension
     
   
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73. A polymeric substance used to make parachute is
  A.  Rayon
  B.  Terylene
  C.  Cotton
  D.  Viscose
     
   
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74. Drinking soda is
  A.  Alkaline
  B.  Neutral
  C.  Acidic
  D.  Oxidant
     
   
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75. Among the following iron ores.the highest percentage of iron content is found in -
  A.  Magnetite
  B.  Haemetite
  C.  Limnonite
  D.  None of these
     
   
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76. Pasteurisation of milk means -
  A.  Heating of milk to above 72°
  B.  Cooling of milk to about 62°C
  C.  Heating of milk to above 62°C
  D.  Cooling of milk to about 10°
     
   
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77. Impure camphor is purified by
  A.  Steam distilation
  B.  Fractional crystallisation
  C.  Fractional distillation
  D.  Sublimation
     
   
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78. Type metal used in printing press is an alloy of
  A.  lead and copper
  B.  lead and antimony
  C.  lead and bismuth
  D.  lead and zinc
     
   
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79. Sour taste of 'Coca Cola' is due to the presence of
  A.  phosphoric acid
  B.  acetic acid
  C.  hydrochloric acid
  D.  formic acid
     
   
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80. The acid rain destroys vegetations because it contains
  A.  Nitric acid
  B.  ozone
  C.  sulphuric acid
  D.  carbon monoxide
     
   
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