Drinking Water Treatment Practice Exam (OHIO Class 1)
Drinking Water Treatment Practice Exam
(OHIO Class 1) Questions and Answers
Question 1
Many sources of water are directly suitable for drinking purposes without treatment
True
False
Correct Answer
False
Question 2
Water treatment plant operators have the responsibility for the health and well-being
of the community they serve.
True
False
Correct Answer
True
Question 3
What is the purpose of coagulation-flocculation?
A. To control corrosion
B. To filter out suspended particles
C. To gather together fine, light particles to form floc to aid the sedimentation and
filtration processes.
D. To settle out larger suspended particles
Correct Answer
C. To gather together fine, light particles to form floc to aid the sedimentation and
filtration processes.
Page 1 of 17
, Drinking Water Treatment Practice Exam (OHIO Class 1)
Question 4
What is the purpose of filtration?
A. To control corrosion
B. To filter out suspended particles
C. To gather together fine, light particles to form floc to aid the sedimentation and
filtration processes.
D. To settle out larger suspended particles
Correct Answer
B. To filter out suspended particles
Question 5
What is the main purpose of a water treatment plant's intake structure?
A. To draw in water while preventing leaves and other debris from clogging or
damaging pumps
B. To ensure fish passage without undue harm to the fishery.
C. To provide a structure for housing the low head influent pumps.
D. To take in excess water from the raw water source
Correct Answer
A. To draw in water while preventing leaves and other debris from clogging or
damaging pumps
Question 6
Smaller sized particles, such as bacteria and fine clays and silts, readily settle out of
water
True
False
Correct Answer
False
Page 2 of 17
, Drinking Water Treatment Practice Exam (OHIO Class 1)
Question 7
Overdosing as well as underdosing of coagulants may lead to reduced solids removal
efficiency.
True
False
Correct Answer
True
Question 8
The maximum allowable level of turbidity in water is 0.5 NTU with a recommended
level of 0.1 NTU
True
False
Correct Answer
True
Question 9
What is alkalinity?
A. A laboratory procedure used to estimate the minimum or ideal coagulant dose
required to achieve certain water quality goals.
B. A process used to kill disease-causing organisms
C. A solution or liquid whose chemical make-up neutralizes acids or bases without a
great change in pH
D. The capacity of water to neutralize acids.
Correct Answer
D. The capacity of water to neutralize acids.
Page 3 of 17
Drinking Water Treatment Practice Exam
(OHIO Class 1) Questions and Answers
Question 1
Many sources of water are directly suitable for drinking purposes without treatment
True
False
Correct Answer
False
Question 2
Water treatment plant operators have the responsibility for the health and well-being
of the community they serve.
True
False
Correct Answer
True
Question 3
What is the purpose of coagulation-flocculation?
A. To control corrosion
B. To filter out suspended particles
C. To gather together fine, light particles to form floc to aid the sedimentation and
filtration processes.
D. To settle out larger suspended particles
Correct Answer
C. To gather together fine, light particles to form floc to aid the sedimentation and
filtration processes.
Page 1 of 17
, Drinking Water Treatment Practice Exam (OHIO Class 1)
Question 4
What is the purpose of filtration?
A. To control corrosion
B. To filter out suspended particles
C. To gather together fine, light particles to form floc to aid the sedimentation and
filtration processes.
D. To settle out larger suspended particles
Correct Answer
B. To filter out suspended particles
Question 5
What is the main purpose of a water treatment plant's intake structure?
A. To draw in water while preventing leaves and other debris from clogging or
damaging pumps
B. To ensure fish passage without undue harm to the fishery.
C. To provide a structure for housing the low head influent pumps.
D. To take in excess water from the raw water source
Correct Answer
A. To draw in water while preventing leaves and other debris from clogging or
damaging pumps
Question 6
Smaller sized particles, such as bacteria and fine clays and silts, readily settle out of
water
True
False
Correct Answer
False
Page 2 of 17
, Drinking Water Treatment Practice Exam (OHIO Class 1)
Question 7
Overdosing as well as underdosing of coagulants may lead to reduced solids removal
efficiency.
True
False
Correct Answer
True
Question 8
The maximum allowable level of turbidity in water is 0.5 NTU with a recommended
level of 0.1 NTU
True
False
Correct Answer
True
Question 9
What is alkalinity?
A. A laboratory procedure used to estimate the minimum or ideal coagulant dose
required to achieve certain water quality goals.
B. A process used to kill disease-causing organisms
C. A solution or liquid whose chemical make-up neutralizes acids or bases without a
great change in pH
D. The capacity of water to neutralize acids.
Correct Answer
D. The capacity of water to neutralize acids.
Page 3 of 17
