Class "C" Water Exam Questions With
100% Correct Solutions | Update 2026
Calcium Hypochlorite - A common chemical used in the disenfection of a
small water supply is-
A Cross Connection - A physical connection between a potable water
supply and a house well would be-
Demand - The amount of Chlorine in mg/L that is used by reacting with iron,
organics, or bacteria is called?
Greenish Yellow color
Heavier than air
Pungent, Penetrating odor
Corrosive - All of the following are Physical characteristics of Chlorine gas-
Solution feed pump - Which of the following would be considered a part of a
hypo-chlorinator system?
Flow measuring device - According to state requirements, all public water
supply wells should be provided with a raised concrete sealing block,
screened vents and-
The difference in static and pumping levels - The drawdown of a water well
is determined by-
If it is more acidic or base - The pH of water indicates-
0-14 - The pH of water is expressed by a scale of numbers ranging from-
7.0 - Water that is considered neutral is expressed on the pH scale at-
, Use of an approved, sterile container - Which of the following is a required
step in collecting a routine distribution sample for bacteriological testing?
Turbidity - Sand filtration will remove which of the following from surface
water?
Taste and Odor control - Activated Carbon is used in a Surface Water Plant
primarily for?
Alum and Ferric Chloride - Which of the following chemical(s) are
commonly used as coagulants in surface water treatment?
Screened Vents
An approved locking roof hatch
An overflow pipe with hinged flap device
Annual inspection and maintenance as needed - Ground storage tanks are
required to be provided with which of the following?
Painting
Cathodic protection
Water stabilization - An elevated storage tank should be protected against
corrosion by-
35 psi - A public water supply system should maintain residual pressure of
20 psi and a minimum normal operating pressure of-
50 mg/L - Before a new or repaired water line is placed into service, it must
be properly disinfected by providing a chlorine dosage of _____ and proper
detention time.
Aquifers - Water bearing formations beneath the earth's surface that are
used as a source of water for public water supplies are-
Determine water levels in the well - The purpose of an air line on a well is-
Reduce the amount of sand pumped - The mesh size is an important
feature of a well screen because property sized openings should-
100% Correct Solutions | Update 2026
Calcium Hypochlorite - A common chemical used in the disenfection of a
small water supply is-
A Cross Connection - A physical connection between a potable water
supply and a house well would be-
Demand - The amount of Chlorine in mg/L that is used by reacting with iron,
organics, or bacteria is called?
Greenish Yellow color
Heavier than air
Pungent, Penetrating odor
Corrosive - All of the following are Physical characteristics of Chlorine gas-
Solution feed pump - Which of the following would be considered a part of a
hypo-chlorinator system?
Flow measuring device - According to state requirements, all public water
supply wells should be provided with a raised concrete sealing block,
screened vents and-
The difference in static and pumping levels - The drawdown of a water well
is determined by-
If it is more acidic or base - The pH of water indicates-
0-14 - The pH of water is expressed by a scale of numbers ranging from-
7.0 - Water that is considered neutral is expressed on the pH scale at-
, Use of an approved, sterile container - Which of the following is a required
step in collecting a routine distribution sample for bacteriological testing?
Turbidity - Sand filtration will remove which of the following from surface
water?
Taste and Odor control - Activated Carbon is used in a Surface Water Plant
primarily for?
Alum and Ferric Chloride - Which of the following chemical(s) are
commonly used as coagulants in surface water treatment?
Screened Vents
An approved locking roof hatch
An overflow pipe with hinged flap device
Annual inspection and maintenance as needed - Ground storage tanks are
required to be provided with which of the following?
Painting
Cathodic protection
Water stabilization - An elevated storage tank should be protected against
corrosion by-
35 psi - A public water supply system should maintain residual pressure of
20 psi and a minimum normal operating pressure of-
50 mg/L - Before a new or repaired water line is placed into service, it must
be properly disinfected by providing a chlorine dosage of _____ and proper
detention time.
Aquifers - Water bearing formations beneath the earth's surface that are
used as a source of water for public water supplies are-
Determine water levels in the well - The purpose of an air line on a well is-
Reduce the amount of sand pumped - The mesh size is an important
feature of a well screen because property sized openings should-
