Class D Water Operator Exam Questions With Verified Answers
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Course
Water Operator
Institution
Water Operator
Class D Water Operator Exam Questions
With Verified Answers
What are some physical characteristics of water? - answerTemperature, turbidity, color, taste,
odor
What are some chemical characteristics of water? - answerHardness, pH, solids, and gases
What is turbidity? - answerthe amount of susp...
Class D Water Operator Exam Questions
With Verified Answers
What are some physical characteristics of water? - answer✔Temperature, turbidity, color, taste,
odor
What are some chemical characteristics of water? - answer✔Hardness, pH, solids, and gases
What is turbidity? - answer✔the amount of suspended matter, such as clay, silt, organic matter,
and microorganisms in water
T/F Water is never found pure in nature. - answer✔True
Is turbidity more of a problem in groundwater or surface water? - answer✔Surface water
A system's filtered water must be _______ Nephelometric Turbidity Units (NTU) or less in at
least 95% of the measurements taken each month, and no sample can exceed _____ NTU. -
answer✔0.3
1
T/F True color is dissolved in water (in solution) and cannot be removed by filtering. -
answer✔True. Tea in water is an example of true color.
Suspended color is called _______ color. - answer✔apparent
Color above ______ units is objectionable in a public water supply. - answer✔15 units
A scale called the ________ measures odor. - answer✔Threshold Odor Number (TON)
Odor greater than a scale of _______ is undesirable. - answer✔3
Taste and odors in water result from _______, bacteria, decaying organic matter, gases, and
chemicals such as manganese, zinc, copper, iron, magnesium, sodium, and potassium. -
answer✔algae
Chemical characteristics of water generally cannot be detected by sight, smell, or taste and must
be determined by __________. - answer✔laboratory analysis
Chemical laboratory analysis must be sampled _______ per year for surface water and normally
_______ for groundwater. - answer✔once/year for surface water
once every three years for groundwater
Water weighs ______ lbs/gal. - answer✔8.34 lbs/gal
T/F
For water, 1 mg/L is equal to 1 part per million (ppm) by weight. - answer✔True
Which two minerals mainly cause hardness in water? - answer✔Calcium and magnesium
Is hardness more of a problem in groundwater or surface water? - answer✔Groundwater
Water is considered hard when it exceeds _______. - answer✔100 mg/L of calcium carbonate
The pH scale ranges from _____ to _____. - answer✔0 to 14
On the pH scale:
0 to <7 is ______.
7 is _______.
>7 to 14 is ______. - answer✔Acidic
Neutral
Basic or alkaline
Sulfuric, hydrochloric, and nitric acids can be used to ______ pH.
Caustic, lime, or soda ash can be used to ______ pH. - answer✔Lower
Raise
Suspended solids can be removed by ________. - answer✔Filtration
Can dissolved solids be removed by filtration? - answer✔No
Total dissolved solids should not exceed________. - answer✔1000 mg/L
What are three common gasses found in water? - answer✔Hydrogen sulfide, carbon dioxide, and
methane
Excess ________ can cause blue baby syndrome. - answer✔Nitrogen or Nitrates
What is the major source of nitrogen into drinking water? - answer✔Fertilizer and animal waste
carried by rainwater runoff
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