CBSE  /  Class 7  /  Science  /  Wastewater Story

  • 1. 
    Which one of the following is a quality of wastewater?

  • Foul smell
  • Bad taste
  • Dirty look
  • All of these

  • 2. 
    Period 2005-2015 is being celebrated as the international decade for action on

  • water for life
  • education for all
  • global war
  • terrorism

  • 3. 
    In sewerage manholes are located at every

  • 20-25 m
  • 50-60 m
  • 90-100 m
  • 100-110 m

  • 4. 
    Which one of the following is a step in wastewater treatment?

  • Aeration
  • Filtration
  • Chlorination
  • All of these

  • 5. 
    Sludge in separate tanks is decomposed to get biogas by

  • yeasts
  • aerobic bacteria
  • anaerobic bacteria
  • none of these

  • 6. 
    Which one of the following is used in vermi-processing toilet?

  • Earthworm
  • Cockroach
  • Both of these
  • None of these

  • 7. 
    Sewage is mainly a

  • liquid waste
  • Solid waste
  • gaseous waste
  • Mixture of solid and gas

  • 8. 
    Which of the following is/are products of wastewater treatment?

  • Biogas
  • Sludge
  • Both Biogas and sludge
  • Aerator

  • 9. 
    Open drain system is a breeding place for which of the following:

  • Files
  • Mosquitoes
  • Organisms which cause diseases
  • All of these

  • 10. 
    Which of the following is not a source of waste water?

  • Sewers
  • Homes
  • Industries
  • Hospitals
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