Class VII

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
Activate sludge is about ______ water
  1. 10%
  2. 25%
  3. 79%
  4. 97%
Which microbe is used to decompose sludge into bio gas?
  1. gaseous
  2. anaerobic bacteria
  3. algae
  4. fungi
Sewage is a _______ waste which causes which causes water and soil pollution.
  1. solid
  2. liquid
  3. gaseous
  4. all of these
The light materials which float during waste water treatment is
  1. sludge
  2. scum
  3. sewerage
  4. biogas
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