Level II Wastewater Treatment Practice Test questions with
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verified detailed answers || ||
What is the most common reason wastewater would contain intermittent amounts of
|| || || || || || || || || || || ||
detritus? _______ : || || ||
a) Industrial discharges
|| ||
b) Commercial discharges
|| ||
c) Residential discharges
|| ||
d) Storm events
|| ||
d) Storm events
|| ||
Combined systems contain wastewater from both:
|| || || || ||
a) Domestic and commercial wastewater
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b) Sanitary wastewater
|| ||
c) Sanitary wastewater and surface runoff
|| || || || ||
d) Surface runoff
|| ||
c) Sanitary wastewater and surface runoff
|| || || || ||
In general, wastewater is what percentage solids content?
|| || || || || || ||
a) 1.0%
||
b) 0.7%
||
c) 0.5%
||
d) 0.1%
||
d) 0.1%
||
In general, wastewater is what percentage suspended solids content?
|| || || || || || || ||
a) 25%
||
b) 30%
||
,c) 35%||
d) 40% ||
b) 30% ||
Aerobic bacteria will only reproduce in an environment with only:
|| || || || || || || || ||
a) Free or dissolved nitrates
|| || || ||
b) Free or dissolved phosphates
|| || || ||
c) Free or dissolved carbon dioxide
|| || || || ||
d) Free or dissolved oxygen
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d) Free or dissolved oxygen
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Anaerobic bacteria will only reproduce in an environment that lacks:
|| || || || || || || || ||
a) Free or dissolved nitrates
|| || || ||
b) Free or dissolved phosphates
|| || || ||
c) Free or dissolved carbon dioxide
|| || || || ||
d) Free or dissolved oxygen
|| || || ||
d) Free or dissolved oxygen
|| || || ||
Biochemical oxygen demand (BOD) test incubates for a time of: || || || || || || || || ||
a) 24 hours
|| ||
b) 2 days
|| ||
c) 5 days
|| ||
d) 7 days
|| ||
c) 5 days
|| ||
"The biochemical oxygen demand (BOD5) determines the amount of biodegradable organic
|| || || || || || || || || || ||
material in wastewater by measuring the oxygen consumed by micro-organisms in
|| || || || || || || || || || ||
decomposing the waste. The test is done by measuring the dissolved oxygen concentration
|| || || || || || || || || || || || ||
of a sample before and after incubation under standard conditions (usually in the dark, for
|| || || || || || || || || || || || || || ||
5 days at 20oC). The BOD5 standard sample bottles are 300mL volume and the samples can
|| || || || || || || || || || || || || || || ||
be preserved in a refrigerator at 4oC for up to a maximum holding time of 2 days."
|| || || || || || || || || || || || || || || ||
, Biochemical oxygen demand (BOD) test incubates at a temperature of: startup. || || || || || || || || || ||
a) 20 oC
|| ||
b) 21 oC
|| ||
c) 25 oC
|| ||
d) 30 oC
|| ||
a) 20 oC
|| ||
"The biochemical oxygen demand (BOD5) determines the amount of biodegradable organic
|| || || || || || || || || || ||
material in wastewater by measuring the oxygen consumed by micro-organisms in
|| || || || || || || || || || ||
decomposing the waste. The test is done by measuring the dissolved oxygen concentration || || || || || || || || || || || || ||
of a sample before and after incubation under standard conditions (usually in the dark, for
|| || || || || || || || || || || || || || ||
5 days at 20oC). The BOD5 standard sample bottles are 300mL volume and the samples can
|| || || || || || || || || || || || || || || ||
be preserved in a refrigerator at 4oC for up to a maximum holding time of 2 days."
|| || || || || || || || || || || || || || || ||
An Imhoff cone measures:
|| || ||
a) Clarity of the wastewater
|| || || ||
b) Volume of settleable solids
|| || || ||
c) Depth of sludge in a clarifier
|| || || || || ||
d) Floc carry over to next process
|| || || || || ||
b) Volume of settleable solids
|| || || ||
The major gas produced in digesters is:
|| || || || || ||
a) Hydrogen
||
b) Hydrogen sulphide
|| ||
c) Methane
||
d) Carbon dioxide
|| ||
c) Methane
||
What is the angle of the bars on a manually cleaned bar screen?
|| || || || || || || || || || || ||
a) 25 o
|| ||
b) 30 o|| ||
|| || || || || || || ||
verified detailed answers || ||
What is the most common reason wastewater would contain intermittent amounts of
|| || || || || || || || || || || ||
detritus? _______ : || || ||
a) Industrial discharges
|| ||
b) Commercial discharges
|| ||
c) Residential discharges
|| ||
d) Storm events
|| ||
d) Storm events
|| ||
Combined systems contain wastewater from both:
|| || || || ||
a) Domestic and commercial wastewater
|| || || ||
b) Sanitary wastewater
|| ||
c) Sanitary wastewater and surface runoff
|| || || || ||
d) Surface runoff
|| ||
c) Sanitary wastewater and surface runoff
|| || || || ||
In general, wastewater is what percentage solids content?
|| || || || || || ||
a) 1.0%
||
b) 0.7%
||
c) 0.5%
||
d) 0.1%
||
d) 0.1%
||
In general, wastewater is what percentage suspended solids content?
|| || || || || || || ||
a) 25%
||
b) 30%
||
,c) 35%||
d) 40% ||
b) 30% ||
Aerobic bacteria will only reproduce in an environment with only:
|| || || || || || || || ||
a) Free or dissolved nitrates
|| || || ||
b) Free or dissolved phosphates
|| || || ||
c) Free or dissolved carbon dioxide
|| || || || ||
d) Free or dissolved oxygen
|| || || ||
d) Free or dissolved oxygen
|| || || ||
Anaerobic bacteria will only reproduce in an environment that lacks:
|| || || || || || || || ||
a) Free or dissolved nitrates
|| || || ||
b) Free or dissolved phosphates
|| || || ||
c) Free or dissolved carbon dioxide
|| || || || ||
d) Free or dissolved oxygen
|| || || ||
d) Free or dissolved oxygen
|| || || ||
Biochemical oxygen demand (BOD) test incubates for a time of: || || || || || || || || ||
a) 24 hours
|| ||
b) 2 days
|| ||
c) 5 days
|| ||
d) 7 days
|| ||
c) 5 days
|| ||
"The biochemical oxygen demand (BOD5) determines the amount of biodegradable organic
|| || || || || || || || || || ||
material in wastewater by measuring the oxygen consumed by micro-organisms in
|| || || || || || || || || || ||
decomposing the waste. The test is done by measuring the dissolved oxygen concentration
|| || || || || || || || || || || || ||
of a sample before and after incubation under standard conditions (usually in the dark, for
|| || || || || || || || || || || || || || ||
5 days at 20oC). The BOD5 standard sample bottles are 300mL volume and the samples can
|| || || || || || || || || || || || || || || ||
be preserved in a refrigerator at 4oC for up to a maximum holding time of 2 days."
|| || || || || || || || || || || || || || || ||
, Biochemical oxygen demand (BOD) test incubates at a temperature of: startup. || || || || || || || || || ||
a) 20 oC
|| ||
b) 21 oC
|| ||
c) 25 oC
|| ||
d) 30 oC
|| ||
a) 20 oC
|| ||
"The biochemical oxygen demand (BOD5) determines the amount of biodegradable organic
|| || || || || || || || || || ||
material in wastewater by measuring the oxygen consumed by micro-organisms in
|| || || || || || || || || || ||
decomposing the waste. The test is done by measuring the dissolved oxygen concentration || || || || || || || || || || || || ||
of a sample before and after incubation under standard conditions (usually in the dark, for
|| || || || || || || || || || || || || || ||
5 days at 20oC). The BOD5 standard sample bottles are 300mL volume and the samples can
|| || || || || || || || || || || || || || || ||
be preserved in a refrigerator at 4oC for up to a maximum holding time of 2 days."
|| || || || || || || || || || || || || || || ||
An Imhoff cone measures:
|| || ||
a) Clarity of the wastewater
|| || || ||
b) Volume of settleable solids
|| || || ||
c) Depth of sludge in a clarifier
|| || || || || ||
d) Floc carry over to next process
|| || || || || ||
b) Volume of settleable solids
|| || || ||
The major gas produced in digesters is:
|| || || || || ||
a) Hydrogen
||
b) Hydrogen sulphide
|| ||
c) Methane
||
d) Carbon dioxide
|| ||
c) Methane
||
What is the angle of the bars on a manually cleaned bar screen?
|| || || || || || || || || || || ||
a) 25 o
|| ||
b) 30 o|| ||
