Class VII

Nitrogen helps in making of nitrogen based
  1. plants
  2. fertilizers
  3. seeds
  4. trees
Light bulbs are filled with
  1. helium
  2. neon
  3. argon
  4. hydrogen
Perfume industry obtain fragrant plants oil using technique
  1. reverse osmosis
  2. distillation
  3. filtration
  4. heating
Iron fillings can be separated from iron and Sulphur mixture by
  1. heating
  2. filtration
  3. magnetic attraction
  4. all of them
Composition of oxygen in clean air by volume is
  1. 20.95%
  2. 78%
  3. 0.90%
  4. 0.03%
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