Class VII

Activate sludge is about ______ water
  1. 10%
  2. 25%
  3. 79%
  4. 97%
Waste water from houses, buildings and other areas is called
  1. Waste water
  2. Sewage
  3. Seepage
  4. Aquarium waste
Which microbe is used to decompose sludge into bio gas?
  1. gaseous
  2. anaerobic bacteria
  3. algae
  4. fungi
Waste chemicals and harmful metals like mercury make water
  1. green
  2. stale
  3. stagnant
  4. poisonous
The light materials which float during waste water treatment is
  1. sludge
  2. scum
  3. sewerage
  4. biogas
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