Class VIII

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
Glass is made of the mixture of
  1. quartz and mica
  2. sand and silicates
  3. salt and quartz
  4. sand and salt
Wood is the main raw material for the manufacture of
  1. paint
  2. paper
  3. ink
  4. gun powder
Optic fibres are mainly used for which of the following?
  1. Musical instruments
  2. Food industry
  3. Weaving
  4. Communication
Which type of fire extinguisher is used for petroleum fire?
  1. Powder type
  2. Liquid type
  3. Soda acid type
  4. Foam type
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