Class XI

Which of the following is the lightest metal?
  1. Mercury
  2. Lithium
  3. Lead
  4. . Silver
The filament of an electric bulb is made of
  1. tungsten
  2. nichrome
  3. graphite
  4. iron
Production of chlorofluorocarbons (CFC) gas which is proposed to be banned in India, is used in which of the following domestic products?
  1. Television
  2. . Refrigerator
  3. Tube light
  4. Cooking gas
Amalgams are
  1. highly coloured alloys
  2. alloys which contain mercury as one of the contents
  3. alloys which have great resistance to abrasion
  4. . alloys which contain carbon
The main constituents of pearls are
  1. calcium oxide and ammonium chloride
  2. . calcium carbonate and magnesium carbonate
  3. . aragonite and conchiolin
  4. ammonium sulphate and sodium carbonate
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