Class D Water Operator exam questions|\ |\ |\ |\ |\ |\
with answers |\
What are some physical characteristics of water? -
|\ |\ |\ |\ |\ |\ |\ |\
CORRECT ANSWERS ✔✔Temperature, turbidity, color, |\ |\ |\ |\ |\
taste, odor |\
What are some chemical characteristics of water? -
|\ |\ |\ |\ |\ |\ |\ |\
CORRECT ANSWERS ✔✔Hardness, pH, solids, and gases |\ |\ |\ |\ |\ |\
What is turbidity? - CORRECT ANSWERS ✔✔the amount of
|\ |\ |\ |\ |\ |\ |\ |\
suspended matter, such as clay, silt, organic matter, and
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
microorganisms in water |\ |\
T/F Water is never found pure in nature. - CORRECT
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔True |\
Is turbidity more of a problem in groundwater or surface
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
water? - CORRECT ANSWERS ✔✔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. - CORRECT ANSWERS ✔✔0.3
|\ |\ |\ |\ |\ |\
,1
T/F True color is dissolved in water (in solution) and
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
cannot be removed by filtering. - CORRECT ANSWERS
|\ |\ |\ |\ |\ |\ |\ |\
✔✔True. Tea in water is an example of true color.
|\ |\ |\ |\ |\ |\ |\ |\ |\
Suspended color is called _______ color. - CORRECT
|\ |\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔apparent |\
Color above ______ units is objectionable in a public water
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
supply. - CORRECT ANSWERS ✔✔15 units
|\ |\ |\ |\ |\
A scale called the ________ measures odor. - CORRECT
|\ |\ |\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔Threshold Odor Number (TON) |\ |\ |\ |\
Odor greater than a scale of _______ is undesirable. -
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
CORRECT ANSWERS ✔✔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. - CORRECT ANSWERS ✔✔algae |\ |\ |\ |\
Chemical characteristics of water generally cannot be
|\ |\ |\ |\ |\ |\ |\
detected by sight, smell, or taste and must be
|\ |\ |\ |\ |\ |\ |\ |\ |\
, determined by __________. - CORRECT ANSWERS |\ |\ |\ |\ |\ |\
✔✔laboratory analysis |\
Chemical laboratory analysis must be sampled _______
|\ |\ |\ |\ |\ |\ |\
per year for surface water and normally _______ for
|\ |\ |\ |\ |\ |\ |\ |\ |\
groundwater. - CORRECT ANSWERS ✔✔once/year for |\ |\ |\ |\ |\ |\
surface water |\
once every three years for groundwater
|\ |\ |\ |\ |\
Water weighs ______ lbs/gal. - CORRECT ANSWERS
|\ |\ |\ |\ |\ |\ |\
✔✔8.34 lbs/gal |\
T/F
For water, 1 mg/L is equal to 1 part per million (ppm) by
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
weight. - CORRECT ANSWERS ✔✔True
|\ |\ |\ |\
Which two minerals mainly cause hardness in water? -
|\ |\ |\ |\ |\ |\ |\ |\ |\
CORRECT ANSWERS ✔✔Calcium and magnesium |\ |\ |\ |\
Is hardness more of a problem in groundwater or surface
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
water? - CORRECT ANSWERS ✔✔Groundwater
|\ |\ |\ |\
Water is considered hard when it exceeds _______. -
|\ |\ |\ |\ |\ |\ |\ |\ |\
CORRECT ANSWERS ✔✔100 mg/L of calcium carbonate
|\ |\ |\ |\ |\ |\
with answers |\
What are some physical characteristics of water? -
|\ |\ |\ |\ |\ |\ |\ |\
CORRECT ANSWERS ✔✔Temperature, turbidity, color, |\ |\ |\ |\ |\
taste, odor |\
What are some chemical characteristics of water? -
|\ |\ |\ |\ |\ |\ |\ |\
CORRECT ANSWERS ✔✔Hardness, pH, solids, and gases |\ |\ |\ |\ |\ |\
What is turbidity? - CORRECT ANSWERS ✔✔the amount of
|\ |\ |\ |\ |\ |\ |\ |\
suspended matter, such as clay, silt, organic matter, and
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
microorganisms in water |\ |\
T/F Water is never found pure in nature. - CORRECT
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔True |\
Is turbidity more of a problem in groundwater or surface
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
water? - CORRECT ANSWERS ✔✔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. - CORRECT ANSWERS ✔✔0.3
|\ |\ |\ |\ |\ |\
,1
T/F True color is dissolved in water (in solution) and
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
cannot be removed by filtering. - CORRECT ANSWERS
|\ |\ |\ |\ |\ |\ |\ |\
✔✔True. Tea in water is an example of true color.
|\ |\ |\ |\ |\ |\ |\ |\ |\
Suspended color is called _______ color. - CORRECT
|\ |\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔apparent |\
Color above ______ units is objectionable in a public water
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
supply. - CORRECT ANSWERS ✔✔15 units
|\ |\ |\ |\ |\
A scale called the ________ measures odor. - CORRECT
|\ |\ |\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔Threshold Odor Number (TON) |\ |\ |\ |\
Odor greater than a scale of _______ is undesirable. -
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
CORRECT ANSWERS ✔✔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. - CORRECT ANSWERS ✔✔algae |\ |\ |\ |\
Chemical characteristics of water generally cannot be
|\ |\ |\ |\ |\ |\ |\
detected by sight, smell, or taste and must be
|\ |\ |\ |\ |\ |\ |\ |\ |\
, determined by __________. - CORRECT ANSWERS |\ |\ |\ |\ |\ |\
✔✔laboratory analysis |\
Chemical laboratory analysis must be sampled _______
|\ |\ |\ |\ |\ |\ |\
per year for surface water and normally _______ for
|\ |\ |\ |\ |\ |\ |\ |\ |\
groundwater. - CORRECT ANSWERS ✔✔once/year for |\ |\ |\ |\ |\ |\
surface water |\
once every three years for groundwater
|\ |\ |\ |\ |\
Water weighs ______ lbs/gal. - CORRECT ANSWERS
|\ |\ |\ |\ |\ |\ |\
✔✔8.34 lbs/gal |\
T/F
For water, 1 mg/L is equal to 1 part per million (ppm) by
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
weight. - CORRECT ANSWERS ✔✔True
|\ |\ |\ |\
Which two minerals mainly cause hardness in water? -
|\ |\ |\ |\ |\ |\ |\ |\ |\
CORRECT ANSWERS ✔✔Calcium and magnesium |\ |\ |\ |\
Is hardness more of a problem in groundwater or surface
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
water? - CORRECT ANSWERS ✔✔Groundwater
|\ |\ |\ |\
Water is considered hard when it exceeds _______. -
|\ |\ |\ |\ |\ |\ |\ |\ |\
CORRECT ANSWERS ✔✔100 mg/L of calcium carbonate
|\ |\ |\ |\ |\ |\
