CBSE Questions for Class 7 Biology Wastewater Story Quiz 5 - MCQExams.com

Last step in wastewater treatment is a ___________ process.
  • Biological
  • Physical
  • Mechanical
  • Chemical
A septic tank is a_______.
  • sedimentation tank
  • digestion tank
  • aeration tank
  • combination of sedimentation and digestion tank
In the waste water treatment plant (WWTP), air is pumped into water to
  • Support the growth of anaerobic bacteria
  • Support the growth of aerobic bacteria
  • Disinfect water
  • Throw human waste
Vermi-processing toilet is beneficial because
  • It reduces the diseases.
  • It increases soil fertility.
  • Both A and B.
  • It reduces electricity.
A natural disaster caused due to insufficient water for agriculture is called
  • flood
  • draught
  • famine
  • forest fire
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