Class VII

Which of the following is a FALSE statement?
  1. Solid wastes such as tea leaves and soft toys should be thrown in dustbin
  2. Chemicals like paints and medicines should not be thrown in sink.
  3. Cooking oil should be thrown down in the wash basin.
  4. Polythene bags should not be thrown in the drains.
The light materials which float during waste water treatment is
  1. sludge
  2. scum
  3. sewerage
  4. biogas
Activate sludge is about ______ water
  1. 10%
  2. 25%
  3. 79%
  4. 97%
Contaminated water disease is
  1. gastroenteritis
  2. malaria
  3. flu
  4. none of these
: Which of the following is an example of low cost onsite sewage disposal system?
  1. septic tanks
  2. chemical toilets
  3. composting pits
  4. all of these
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