WATER NUGGETS PRACTICE TEST QUESTIONS &
ANSWERS
5% - Answers - What percentage of solids sludge is produced in the precipitative
softening plant?
Have a volume of 100mL and the initial incubation period is 24hrs at 35 degrees Celsius
- Answers - HPC and Coliform tests are the same because they both?
170-180 Degrees Fahrenheit - Answers - A chlorine evaporator maintains a water bath
at?
2 to 3 gpm/ft2 - Answers - What is the filtration flow rate through a manganese
greensand pressure filter at 10 degrees Celsius?
10 Years - Answers - Records of chemical analyses should be kept for?
Algae - Answers - What is dissolved air flotation good for removing?
Inorganic - Answers - Impurities found in water that do not come from plants or
animals are
Removal by filtration and inactivation by disinfection - Answers - Under the Surface
Water Treatment Rule a multiple barrier treatment consists of
Carryover from the Sedimentation Basin - Answers - An increase in filter media head
loss could be an indicator of?
Launder - Answers - What is used as part of a sedimentation basin to allow a
controlled flow of the supernatant to be collected and directed to the filter beds?
Gram Negative - Answers - Coliform bacteria are classified as?
Sand or other material from the aquifer entering the well pump - Answers - What could
be the reason for reduced pump flow, deteriorating pump impellers, plugging Needle
Valves, and clogging PRV and Surge Control Valves?
Sonic Flow - Answers - What is the simplest chlorine gas feeder for controlling chlorine
gas flow?
0.5 mg/L - Answers - Every 1.0 mg/L of alum consumes what amount of alkalinity
during the formation of floc particles?
Gypsum - Answers - What is calcium sulfate also known as?
,HOCI & OCI- - Answers - What are the chemical symbols for hypochlorous acid and
hypochlorite ions?
Aluminum Hydroxide - Answers - With coagulation reactions when alum is used, the
specific insoluble floc formed is a precipitate of?
0.1 to 2.0% - Answers - In alum sludge, what is typically the percentage of solid
material?
2,000 ppm - Answers - Even a low concentration of ammonia gas can be fatal to
humans if it is at least?
4.0-6.0 - Answers - For alum coagulation of color, what is the correct pH?
Cryptosporidium - Answers - What organism can escape coagulation and then pass
through a granular filter?
4.0 Degrees Celsius - Answers - At what temperature does the maximum density of
water occur?
Requires regeneration with potassium permanganate 1 hour soak with 60 grams
KMnO4/ft3 - Answers - Virgin Greensand...
Does not regenerate
Requires regeneration with potassium permanganate 2 hour soak with 30 grams
KMnO4/ft3
Requires regeneration with potassium permanganate 3 hour soak with 80 grams
KMnO4/ft3
Requires regeneration with potassium permanganate 1 hour soak with 60 grams
KMnO4/ft3
500 CFU - Answers - A coliform sample is considered invalid and a new sample must
be taken within 24hrs if the HPC count is above?
larger - Answers - Protozoa are ______ than bacteria which are larger than viruses.
24 and 48hrs at 35 degrees Celsius - Answers - When doing coliform analysis use the
presence-absence method, a sample should be incubated for?
Lagoons - Answers - For lime-soda ash softening plants, what is the most economical
sludge disposal method?
Remove Debris - Answers - Bar screens are used to?
, Several Seconds - Answers - Typically, how long is the flash mixing time in the
coagulation process?
Cryptosporidium Parvum - Answers - Which is the most persistent protozoa?
Trapezoid
Cryptosporidium Parvum
Giardia
Cryptocurrency Parvum
Tier I - Answers - A system that fails to collect water samples in their distribution
system would fall under which public notification system?
Less than 0.1 NTUs - Answers - If a rapid gravity filter is well operated, the finished
water will have?
Fluoride - Answers - What is the only MCL that varies with the temperature?
Are best controlled by filtration followed by disinfection - Answers - The organism that
causes Giardiasis
Easily taken care of with chlorine
Are only a concern if there are animals drinking from your source water
Are best controlled by filtration followed by disinfection
Are too small to be filtered
Calcium - Answers - The injection of fluoride should be as far away as possible from
any chemical containing?
Nanofiltration - Answers - What is a similar process to reverse osmosis that uses lower
pressures without removing all mineral content?
5 ntu - Answers - Turbidity in the drinking water system can not exceed?
The addition of an acid to lower pH before coagulation - Answers - What is the best
addition for water that is highly colored due to organic matter?
To Remove Pathogens - Answers - What is the most important reason to reduce
turbidity?
ANSWERS
5% - Answers - What percentage of solids sludge is produced in the precipitative
softening plant?
Have a volume of 100mL and the initial incubation period is 24hrs at 35 degrees Celsius
- Answers - HPC and Coliform tests are the same because they both?
170-180 Degrees Fahrenheit - Answers - A chlorine evaporator maintains a water bath
at?
2 to 3 gpm/ft2 - Answers - What is the filtration flow rate through a manganese
greensand pressure filter at 10 degrees Celsius?
10 Years - Answers - Records of chemical analyses should be kept for?
Algae - Answers - What is dissolved air flotation good for removing?
Inorganic - Answers - Impurities found in water that do not come from plants or
animals are
Removal by filtration and inactivation by disinfection - Answers - Under the Surface
Water Treatment Rule a multiple barrier treatment consists of
Carryover from the Sedimentation Basin - Answers - An increase in filter media head
loss could be an indicator of?
Launder - Answers - What is used as part of a sedimentation basin to allow a
controlled flow of the supernatant to be collected and directed to the filter beds?
Gram Negative - Answers - Coliform bacteria are classified as?
Sand or other material from the aquifer entering the well pump - Answers - What could
be the reason for reduced pump flow, deteriorating pump impellers, plugging Needle
Valves, and clogging PRV and Surge Control Valves?
Sonic Flow - Answers - What is the simplest chlorine gas feeder for controlling chlorine
gas flow?
0.5 mg/L - Answers - Every 1.0 mg/L of alum consumes what amount of alkalinity
during the formation of floc particles?
Gypsum - Answers - What is calcium sulfate also known as?
,HOCI & OCI- - Answers - What are the chemical symbols for hypochlorous acid and
hypochlorite ions?
Aluminum Hydroxide - Answers - With coagulation reactions when alum is used, the
specific insoluble floc formed is a precipitate of?
0.1 to 2.0% - Answers - In alum sludge, what is typically the percentage of solid
material?
2,000 ppm - Answers - Even a low concentration of ammonia gas can be fatal to
humans if it is at least?
4.0-6.0 - Answers - For alum coagulation of color, what is the correct pH?
Cryptosporidium - Answers - What organism can escape coagulation and then pass
through a granular filter?
4.0 Degrees Celsius - Answers - At what temperature does the maximum density of
water occur?
Requires regeneration with potassium permanganate 1 hour soak with 60 grams
KMnO4/ft3 - Answers - Virgin Greensand...
Does not regenerate
Requires regeneration with potassium permanganate 2 hour soak with 30 grams
KMnO4/ft3
Requires regeneration with potassium permanganate 3 hour soak with 80 grams
KMnO4/ft3
Requires regeneration with potassium permanganate 1 hour soak with 60 grams
KMnO4/ft3
500 CFU - Answers - A coliform sample is considered invalid and a new sample must
be taken within 24hrs if the HPC count is above?
larger - Answers - Protozoa are ______ than bacteria which are larger than viruses.
24 and 48hrs at 35 degrees Celsius - Answers - When doing coliform analysis use the
presence-absence method, a sample should be incubated for?
Lagoons - Answers - For lime-soda ash softening plants, what is the most economical
sludge disposal method?
Remove Debris - Answers - Bar screens are used to?
, Several Seconds - Answers - Typically, how long is the flash mixing time in the
coagulation process?
Cryptosporidium Parvum - Answers - Which is the most persistent protozoa?
Trapezoid
Cryptosporidium Parvum
Giardia
Cryptocurrency Parvum
Tier I - Answers - A system that fails to collect water samples in their distribution
system would fall under which public notification system?
Less than 0.1 NTUs - Answers - If a rapid gravity filter is well operated, the finished
water will have?
Fluoride - Answers - What is the only MCL that varies with the temperature?
Are best controlled by filtration followed by disinfection - Answers - The organism that
causes Giardiasis
Easily taken care of with chlorine
Are only a concern if there are animals drinking from your source water
Are best controlled by filtration followed by disinfection
Are too small to be filtered
Calcium - Answers - The injection of fluoride should be as far away as possible from
any chemical containing?
Nanofiltration - Answers - What is a similar process to reverse osmosis that uses lower
pressures without removing all mineral content?
5 ntu - Answers - Turbidity in the drinking water system can not exceed?
The addition of an acid to lower pH before coagulation - Answers - What is the best
addition for water that is highly colored due to organic matter?
To Remove Pathogens - Answers - What is the most important reason to reduce
turbidity?
