Class VII

Purification and removal of bacteria, solid materials and other impurities from used water is classified as
  1. distillation
  2. cloud seeding
  3. reclamation
  4. membrane filtration
Percentage of Earth surface which is covered by oceans and seas is
  1. 50%
  2. 65%
  3. 85%
  4. 97%
Supplies of freshwater is reduced by
  1. air pollution
  2. water pollution
  3. noise pollution
  4. both a and c
Contaminated rainwater is result of
  1. higher soil moisture
  2. poor sewerage system
  3. air pollution
  4. noise pollution
Higher level of floods and droughts are led by
  1. sand storms
  2. lower precipitation
  3. higher precipitation
  4. none of the above
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