Class VIII

Paper is manufactured by
  1. Wood and resin
  2. Wood, sodium and bleaching powder
  3. Wood, calcium, hydrogen sulphite and resin
  4. Wood and bleaching powder
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
What are the soaps?
  1. Salts of silicates
  2. Mixture of glycerol and alcohols
  3. Sodium or potassium salts of heavier fatty acids
  4. Esters of heavy fatty acids
Detergents used for cleaning clothes and utensils contain?
  1. bicarbonates
  2. bismuthates
  3. sulphonates
  4. nitrates
Optic fibres are mainly used for which of the following?
  1. Musical instruments
  2. Food industry
  3. Weaving
  4. Communication
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