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1000 Waste Water Engineering
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Q.1
What is Waste Water Engineering?
a) use of engineering approaches to enhance the cleanliness of human populations
b) removing and disposing of human waste
c) providing safe drinking water
d) all of the mentioned
Q.2
How is Chemical Oxygen Demand (COD) calculated?
a) Waste water is oxidised chemically using strontium in acid solutions
b) Waste water is oxidised chemically using bromine in acid solutions
c) Waste water is oxidised chemically using dichromate in acid solutions
d) Waste water is oxidised chemically using sodium in acid solutions
Q.3
Which of the following is the next step after water abstraction in waste water treatment?
a) Treatment
b) Supply to consumers
c) Supply to receiving body
d) Combine with stormwater
Q.4
Which of the following type of treatment methods are used for municipal and industrial waste waters?
a) Main stream
b) Slow rate
c) Overflow
d) Rapid infiltration
Q.5
What is the minimum diameter of pipes used for drainage of waste water?
a) 105 mm
b) 50 mm
c) 100 mm
d) 75 mm
Q.6
Which of the following type of waste water treatment process is used for treating waste water or industrial waste water using aeration and biological flocs?
a) Biological aeration
b) Anaerobic digestion
c) Active sludge process
d) Aeration
Q.7
Which of the following is called as the waste water from different sources like bathrooms, kitchens, and washbasins?
a) Discharge
b) Sullage
c) Garbage
d) Sewage
Q.8
What is the waste water flow in a sewer system during the periods of dry weather with minimum infiltration called?
a) Wet flow
b) Dry flow
c) Dry weather flow
d) Wet weather flow
Q.9
What percentage of solids does waste water contain?
a) 0.1%
b) 1%
c) 0.5%
d) 5%
Q.10
When alum is added to the waste water containing calcium ions which compound is formed as a precipitate?
a) Al2 (SO4)3
b) CaCO3
c) Al(OH)3
d) Ca(OH)2
Q.11
What is the lowest waste water flow in hospitals?
a) 40 lpcd
b) 900 lpcd
c) 700 lpcd
d) 50 gpcd
Q.12
How many forms of nitrogen are present in waste water?
a) 5
b) 4
c) 3
d) 2
Q.13
Which of the following water carriage system is used in urban cities like Bangalore?
a) Partially separate system
b) Partially combined system
c) Combined system
d) Separate system
Q.14
Assume in a sample of waste water aroundTSS is removed by primary sedimentation without chemical addition. Calculate the mass of TSS removed for the following data.
a) 132 kg/d
b) 100 kg/d
c) 102 kg/d
d) 130 kg/d
Q.15
Which of the following is the controlled application of waste water onto the land surface to achieve a specified level of treatment?
a) Soil treatment
b) Land treatment
c) Waste water treatment
d) Water treatment
Q.16
Advanced waste water sludge constitutes which of the following?
a) Chemical and biological solids
b) Biological solids
c) Settlable solids
d) Chemical sludge
Q.17
What is the maximum concentration of total solids present in waste water?
a) 850 mg/L
b) 1200 mg/ L
c) 720 mg/L
d) 350 mg/L
Q.18
Which of the following tends to resist conventional methods of waste water treatment?
a) Refractory organics
b) Priority pollutants
c) Suspended solids
d) Nutrients
Q.19
Which of the following waste water constituents are removed by chemical immobilization?
a) Suspended solids
b) Metals
c) Phosphorus
d) BOD
Q.20
Which of the following represents the heavier inert matter in waste water?
a) Screens
b) Grit
c) Debris
d) Waste
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