Class VIII

Which type of fire extinguisher is used for petroleum fire?
  1. Powder type
  2. Liquid type
  3. Soda acid type
  4. Foam type
Gypsum is added to cement clinker to
  1. increase the tensile strength of cement
  2. decrease the rate of setting of cement
  3. facilitate the formation of colloidal gel
  4. bind the particles of calcium silicate
Detergents used for cleaning clothes and utensils contain?
  1. bicarbonates
  2. bismuthates
  3. sulphonates
  4. nitrates
The major ingredient of leather is
  1. collagen
  2. carbohydrate
  3. polymer
  4. nucleic acid
Which of the following is used for removing air bubbles from glass during its manufacture?
  1. Arsenous oxide
  2. Potassium carbonate
  3. Soda ash
  4. Feldspar
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