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141. Browning of paper in old books is caused by:
  A.  Frequent use
  B.  Oxidation of cellulose
  C.  Collection of dust
  D.  Lack of aeration
     
   
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142. In deep-sea diving, divers use of mixture of gases consisting of oxygen and:
  A.  Nitrogen
  B.  Hydrogen
  C.  Argon
  D.  Helium
     
   
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143. PH scale ranges from
  A.  0 - 7
  B.  8 - 14
  C.  10 - 14
  D.  >0 - 14
     
   
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144. When cathode rays strike a tartget of high atomic weight, they give rise to
  A.  α-rays
  B.  β and γ rays
  C.  X-rays
  D.  Positive rays
     
   
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145. Which one of the following elements exhibits the greatest tendency to lose electrons?
  A.  Fluorine
  B.  Lithium
  C.  Oxygen
  D.  Zinc
     
   
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146. Poison used for killing rats is:
  A.  Calcium phosphide (Ca3P2)
  B.  Magnesium nitride(Mg3N2)
  C.  Zinc phosphide(Zn3P2)
  D.  Magnesium Phosphide(Mg3P2)
     
   
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147. Antacid tablets consist of:
  A.  Hydroxices of sodium, magnesium and aluminium
  B.  Hydroxides of magnesium and sodium
  C.  Hydroxides of sodium and aluminium
  D.  Hydroxides of magnesium and aluminium
     
   
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148. The alkoloid naturally found in coffee, cocoa and cola nut is
  A.  Cocaine
  B.  Caffeine
  C.  Tannin
  D.  Morphine
     
   
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149. The chemical name of "Hypo" commonly used in photography is _____________________.
  A.  Sodium thiosulphate
  B.  Silver nitrate
  C.  Sodium nitrate
  D.  Silver iodide
     
   
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150. Concentration of a material which is lethal to 50% animal is called
  A.  NOAEL
  B.  LC50
  C.  LD50
  D.  ADI
     
   
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