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MCQs

Total Questions : 212 | Page 2 of 22 pages
Question 11. The filtering medium of trickling filters is coated with microbial flora, known as
  1.    zoological film
  2.    geological film
  3.    zooglocal film
  4.    none of these
 Discuss Question
Answer: Option C. -> zooglocal film
Answer: (c).zooglocal film
Question 12. Some cyanobacteria produce potent neurotoxins that, if ingested, will kill humans. These cyanobacteria are most likely to contaminate
  1.    water rich in organic carbon wastes but poor in phosphate
  2.    water that are anoxic
  3.    water rich in phosphate wastes but poor in organic carbon
  4.    none of the above
 Discuss Question
Answer: Option C. -> water rich in phosphate wastes but poor in organic carbon
Answer: (c).water rich in phosphate wastes but poor in organic carbon
Question 13. Advanced treatment is generally used to treat waste water to
  1.    remove coarse solids
  2.    remove settleable solids
  3.    reduce BOD
  4.    remove additional objectionable substances
 Discuss Question
Answer: Option D. -> remove additional objectionable substances
Answer: (d).remove additional objectionable substances
Question 14. The biogas production process takes place at the temperature
  1.    lesser than 25°C
  2.    25-40°C
  3.    45-60°C
  4.    all of these
 Discuss Question
Answer: Option D. -> all of these
Answer: (d).all of these
Question 15. Treatment of municipal water supplies is based upon
  1.    coagulation, filtration, chlorination
  2.    chlorination, filtration, coagulation
  3.    filtration, coagulation, chlorination
  4.    coagulation, chlorination, filtration
 Discuss Question
Answer: Option A. -> coagulation, filtration, chlorination
Answer: (a).coagulation, filtration, chlorination
Question 16. Composting is one of the oldest forms of disposal of waste. It is the natural process of decomposition of organic waste that yields manure or compost. One of the following is added to the compost to get better results?
  1.    Ants
  2.    Bugs
  3.    Snakes
  4.    Worms
 Discuss Question
Answer: Option D. -> Worms
Answer: (d).Worms
Question 17. Which of the following statement is not correct?
  1.    The use of 25-40°C temperatures allows the biogas production to be more stable
  2.    The use of 25-40°C temperatures does not destroy potentially harmful bacteria
  3.    The use of 25-40°C temperatures destroys potentially harmful bacteria
  4.    None of the above
 Discuss Question
Answer: Option C. -> The use of 25-40°C temperatures destroys potentially harmful bacteria
Answer: (c).The use of 25-40°C temperatures destroys potentially harmful bacteria
Question 18. Which of the following is generally not referred to the sewerage system?
  1.    Sanitary sewers
  2.    Storm sewers
  3.    Combined sewers
  4.    Solid sewers
 Discuss Question
Answer: Option D. -> Solid sewers
Answer: (d).Solid sewers
Question 19. Oxidation ponds are shallow ponds, generally designed at the depth of
  1.    2 to 40 feet
  2.    4 to 6 feet
  3.    1 to 3 feet
  4.    5 to 8 feet
 Discuss Question
Answer: Option A. -> 2 to 40 feet
Answer: (a).2 to 40 feet
Question 20. Which is not a form of biomass energy?
  1.    Incineration of solid waste
  2.    Composting to produce methane
  3.    Ethanol and methanol production for auto fuel
  4.    Photovoltaic production of hydrogen
 Discuss Question
Answer: Option D. -> Photovoltaic production of hydrogen
Answer: (d).Photovoltaic production of hydrogen

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