TEXAS WASTEWATER D CORE EXAM TEST QUESTIONS
AND SOLUTIONS RATED A+
✔✔Meter readers bring in operating revenue and profoundly impact _____ relations. -
✔✔Public
✔✔The federal regulator of drinking water is the _____. - ✔✔EPA
✔✔T/F: Duties of distribution operator include repairing leaks, making taps, flushing
mains, and taking radiological samples. - ✔✔False (Repair leaks, Make taps, Flush
mains, Operate pumps, Take *bacteriological* samples)
✔✔A service area has 1000 service connections. What can we estimate the population
of this service area to be? - ✔✔3,000 (multiply connections x 3)
✔✔T/F: The State must be notified after an existing facility is changed or after
construction of a new facility. - ✔✔False (must notify *before*)
✔✔T/F: A Class "D" license is valid for 2 years at ground and purchase water systems
with 250 connections or less. - ✔✔False (3 years)
✔✔T/F: The physical characteristics of water are color, taste, odor, temperature, and
turbidity. - ✔✔True
✔✔An alkaline or basic solution has a pH greater than ____. - ✔✔7
✔✔T/F: The terms mg/L and ppm are not interchangeable. - ✔✔False (they are
interchangeable)
✔✔Suspended solids in water cannot be filtered out. - ✔✔False (they can)
✔✔Solids, water hardness, pH and gases are ____ characteristics. - ✔✔Chemical
✔✔T/F: There are 2 hydrogen atoms and 1 oxygen atom in each water molecule. -
✔✔True
✔✔T/F: The State recommends a water pH of less than 7 to be maintained at all time. -
✔✔False (The state recommends a pH slightly greater than 7 and for the water to be
non-corrosive.)
✔✔T/F: Taste and odor can come from organisms such as vegetation, bacteria, and
algae, and from certain chemicals and metals. - ✔✔True
, ✔✔T/F: The deeper the well, the warmer the water. - ✔✔True
✔✔T/F: The threshold odor number (TON) relates to the number of dilutions needed for
the water to be tasteless. - ✔✔False (It reflects the number of dilutions needed for water
sample to be *odorless*)
✔✔One part per million or 1 mg/L means that for every ____ pounds of water there is
one pound of material in it. - ✔✔1 million
✔✔The State requires filtered water to be equal to or less than ____ turbidity units in at
least 95% of the monthly samples. - ✔✔0.3
✔✔The State recommends a TON of ___ or less. - ✔✔3
✔✔T/F: The State recommends 20 color units or less for a quality water. - ✔✔False
(The state recommends 15 units of color or less for drinking water.)
✔✔T/F: Examples of inorganic matter found in water include rock, sand, metals, and
minerals. - ✔✔True
✔✔T/F: The red color caused by iron is an example of suspended or apparent color and
it can be removed by filtration. - ✔✔True
✔✔Excessive calcium and _____ are the primary cause of hardness in water. -
✔✔Magnesium
✔✔T/F: The State recommends a maximum total dissolved solids content of 500 mg/L -
✔✔False (The state recommends that TDS not exceed 1000 mg/L)
✔✔There are 3 common gases found in water: methane, carbon dioxide, and
__________ ___________. - ✔✔hydrogen sulfide
✔✔T/F: Turbidity must be limited because it shelters and nourishes bacteria and
interferes with disinfection. - ✔✔True
✔✔T/F: Bleach or alcohol require less contact time than flaming to disinfect a faucet. -
✔✔False (flaming requires less contact time)
✔✔T/F: The "primary limits" refer to chemicals with maximum contaminant levels that
can be exceeded. - ✔✔False (refers to chemicals with maximum contaminant levels
(MCLs) that *CANNOT* be exceeded.)
AND SOLUTIONS RATED A+
✔✔Meter readers bring in operating revenue and profoundly impact _____ relations. -
✔✔Public
✔✔The federal regulator of drinking water is the _____. - ✔✔EPA
✔✔T/F: Duties of distribution operator include repairing leaks, making taps, flushing
mains, and taking radiological samples. - ✔✔False (Repair leaks, Make taps, Flush
mains, Operate pumps, Take *bacteriological* samples)
✔✔A service area has 1000 service connections. What can we estimate the population
of this service area to be? - ✔✔3,000 (multiply connections x 3)
✔✔T/F: The State must be notified after an existing facility is changed or after
construction of a new facility. - ✔✔False (must notify *before*)
✔✔T/F: A Class "D" license is valid for 2 years at ground and purchase water systems
with 250 connections or less. - ✔✔False (3 years)
✔✔T/F: The physical characteristics of water are color, taste, odor, temperature, and
turbidity. - ✔✔True
✔✔An alkaline or basic solution has a pH greater than ____. - ✔✔7
✔✔T/F: The terms mg/L and ppm are not interchangeable. - ✔✔False (they are
interchangeable)
✔✔Suspended solids in water cannot be filtered out. - ✔✔False (they can)
✔✔Solids, water hardness, pH and gases are ____ characteristics. - ✔✔Chemical
✔✔T/F: There are 2 hydrogen atoms and 1 oxygen atom in each water molecule. -
✔✔True
✔✔T/F: The State recommends a water pH of less than 7 to be maintained at all time. -
✔✔False (The state recommends a pH slightly greater than 7 and for the water to be
non-corrosive.)
✔✔T/F: Taste and odor can come from organisms such as vegetation, bacteria, and
algae, and from certain chemicals and metals. - ✔✔True
, ✔✔T/F: The deeper the well, the warmer the water. - ✔✔True
✔✔T/F: The threshold odor number (TON) relates to the number of dilutions needed for
the water to be tasteless. - ✔✔False (It reflects the number of dilutions needed for water
sample to be *odorless*)
✔✔One part per million or 1 mg/L means that for every ____ pounds of water there is
one pound of material in it. - ✔✔1 million
✔✔The State requires filtered water to be equal to or less than ____ turbidity units in at
least 95% of the monthly samples. - ✔✔0.3
✔✔The State recommends a TON of ___ or less. - ✔✔3
✔✔T/F: The State recommends 20 color units or less for a quality water. - ✔✔False
(The state recommends 15 units of color or less for drinking water.)
✔✔T/F: Examples of inorganic matter found in water include rock, sand, metals, and
minerals. - ✔✔True
✔✔T/F: The red color caused by iron is an example of suspended or apparent color and
it can be removed by filtration. - ✔✔True
✔✔Excessive calcium and _____ are the primary cause of hardness in water. -
✔✔Magnesium
✔✔T/F: The State recommends a maximum total dissolved solids content of 500 mg/L -
✔✔False (The state recommends that TDS not exceed 1000 mg/L)
✔✔There are 3 common gases found in water: methane, carbon dioxide, and
__________ ___________. - ✔✔hydrogen sulfide
✔✔T/F: Turbidity must be limited because it shelters and nourishes bacteria and
interferes with disinfection. - ✔✔True
✔✔T/F: Bleach or alcohol require less contact time than flaming to disinfect a faucet. -
✔✔False (flaming requires less contact time)
✔✔T/F: The "primary limits" refer to chemicals with maximum contaminant levels that
can be exceeded. - ✔✔False (refers to chemicals with maximum contaminant levels
(MCLs) that *CANNOT* be exceeded.)
