Q.1
Which of the following process is employed to gain sufficient head for the waste water?
  • a) Fermentation
  • b) Oxidation
  • c) Screening
  • d) Pumping
Q.2
Which of the following is the most commonly used coagulant?
  • a) Ferric sulphate
  • b) Coal
  • c) Alum
  • d) Limestone
Q.3
Which of the following waste water treatment plant may or may not need the screens?
  • a) Industrial
  • b) Sewage
  • c) Chemical
  • d) Domestic
Q.4
Which of the following is the product obtained when a coagulant is mixed with waste water?
  • a) Floc
  • b) Grit
  • c) Acid
  • d) Sediments
Q.5
What is the waste water called after physical and biological removal of solids?
  • a) Secondary treated water
  • b) Secondary treated waste water
  • c) Primary effluent
  • d) Primary treated water
Q.6
What is the amount of phosphorus present in municipal waste water?
  • a) 5-20 mg/L
  • b) 4-12 mg/L
  • c) 2-8 mg/L
  • d) 1-2 mg/L
Q.7
How does the waste water enter the reactor?
  • a) Top and side
  • b) Side
  • c) Bottom
  • d) Top
Q.8
Which of the following is the common indicator organism used in the evaluation of waste water?
  • a) Total coliform
  • b) Fecal coliform
  • c) Algae
  • d) E. coli
Q.9
What is the minimum percentage of solids in waste water?
  • a) 60 %
  • b) 50 %
  • c) 30 %
  • d) 40 %
Q.10
What is the colour of septic waste water?
  • a) Light brown
  • b) Dark brown
  • c) Black
  • d) Grey
Q.11
Which of the following is constructed outside the building to carry waste water discharge?
  • a) S. trap
  • b) Gully trap
  • c) Floor trap
  • d) P. trap
Q.12
What is the waste water from kitchen sinks called?
  • a) Brown water
  • b) Yellow water
  • c) Black water
  • d) Grey water
Q.13
Which of the following waste water does not contain sewage?
  • a) Sewerage
  • b) Grey water
  • c) Sullage
  • d) Sewage
Q.14
What is the term used for the reuse of sewage sludge?
  • a) Biosolids
  • b) Potential solids
  • c) Manure
  • d) Solids
Q.15
Which of the following is required to transport storm water runoff from roofs, parking lots, streets, and highways to a point of discharge?
  • a) Waste water sewers
  • b) Water sewers
  • c) Storm sewers
  • d) Sanitary sewers
Q.16
What is the upflow velocity considered for an UASB while treating domestic waste water?
  • a) 1-2 m/h
  • b) 0.8-1 m/h
  • c) 3-4 m/h
  • d) 2-3 m/h
Q.17
What is the hydraulic loading rate in m2/m3/h of a cloth disc filter assumed while designing it?
  • a) 2-4
  • b) 1-2
  • c) 10-20
  • d) 0.1-0.27
Q.18
What is the hydraulic loading rate in m2/m3/h of a disc filter assumed while designing it?
  • a) 2.5-8.3
  • b) 0.02-0.083
  • c) 8.3-10
  • d) 0.25-0.83
Q.19
What is the function of two tanks provided in septic tank systems?
  • a) Store large amount of effluent
  • b) Divide black and grey water
  • c) Divide waste water and water
  • d) Divide solids and liquid
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