Class VII

Composition of oxygen in clean air by volume is
  1. 20.95%
  2. 78%
  3. 0.90%
  4. 0.03%
Solid particles which are left on filter paper while filtration is called
  1. residue
  2. filtrate
  3. solvent
  4. solute
Oxygen rich air is used for
  1. scuba diving
  2. patients with breathing problems
  3. both a and b
  4. cancer treatment
A method which is used to separate, analyze or identify different components in mixture such as food, dyes and inks is called
  1. chromatography
  2. combustion
  3. spectroscopy
  4. Fractional distillation
Light bulbs are filled with
  1. helium
  2. neon
  3. argon
  4. hydrogen
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