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131. Philosopher's wool is chemically
  A.  Aluminium oxide
  B.  Magnesium oxide
  C.  Zinc oxide
  D.  Calcium oxide
     
   
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132. Chloroform can be used as
  A.  Analgesic
  B.  Antibiotic
  C.  Antimalarial
  D.  Anaesthetic
     
   
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133. 'Aerosol' is
  A.  Suspended solid particles in air
  B.  Pollutant gas, present in air
  C.  Microbes,present in air
  D.  Green house gas present in air
     
   
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134. Which among the following is found in chlorophyll?
  A.  Ca2+
  B.  Mg2+
  C.  Fe2+
  D.  Al3+
     
   
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135. The fat of a common mussel secretes a sticky glue that can be used to make heart implants.The unique chemical compound present in the glue is:
  A.  Amino phenyl alanine
  B.  Hydroxy phenyl alanine
  C.  Phenyl alanine
  D.  Dihydroxy phenyl alanine
     
   
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136. When a metal is heated in a flame, the electrons absorbs energy and jump to higher energy state.On coming back to the lower energy siate,they emit light, which we can observe in
  A.  Emission spectra
  B.  Absorption spectra
  C.  Raman spectra
  D.  Fluroscence
     
   
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137. Ethanol containing 5% water is known as:
  A.  Dilute alchol
  B.  Power alchol
  C.  Rectified spirit
  D.  Absolute alchol
     
   
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138. The chemical formula of the laughing gas is
  A.  NO
  B.  N2O
  C.  NO2
  D.  N2O3
     
   
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139. Ultraviolet rays can be used in water treatment as
  A.  Flocculator
  B.  Precipitator
  C.  Hydrolyser
  D.  Disinfectant
     
   
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140. The open "Sigrees" or coal stoves often require fanning to substain burning because of
  A.  accumulation of smoke and dust over the sigrees
  B.  lack of oxygen in the surrouding of sigrees
  C.  tendency of carbon dioxide to form a layer along with dust smoke
  D.  interrupted release of moisture form the material
     
   
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