PMT 108 PRINCIPLES OF WATER
TEST 1 QUESTIONS WITH 100%
CORRECT ANSWERS
What term describes: Backflow resulting from negative pressures in the distributions
pipes of potable water systems - Answer- Back- siphonage
Which step in solving a waterborne disease outbreak:
- Test hypothesis by obtaining additional information to confirm or refute their validity
- Find controls; perosn who had the same exposure but remained well - Answer-
Evaluate hypothesis
Which step in solving a waterborne disease outbreak:
- Attempts to identifies additional cases
- Confirms the existence of an outbreak - Answer- Define and identify cases
Which step in solving a waterborne disease outbreak:
- Receives complaints
- Based on disease trends in the community, determine whether there is a higher than
the expected number of cases in the community
- Ensure the complaints fit the definition of a waterborne disease outbreak - Answer-
Established the existence of an outbreak
Which step in solving a waterborne disease outbreak:
- Assembles materials
- Establishes teams - Answer- Prepare for field work
What are some sanitary standards for water storage? - Answer- - Overflows must be
located with their tops six inches above grade
- Bottom of the tank must be higher than the water table or flood water, designed for a
minimum of eight feet
- The ground around the tank must be sloped away from the tank to provide drainage
How would one remove surplus chlorine from the super chlorination method? - Answer-
With:
- Sulfur Dioxide (SO2)
- Aeration
- Activated carbon
, Which method of chlorination: Application of chlorine in greater concentrations than are
needed to afford acceptable bactericidal efficiency? - Answer- Super Chlorination
Which method of chlorination: Also refers to the application of chlorine to produce the
desired total chlorine residual without reference to the relative amounts of free or
combined chlorine present? - Answer- Marginal Chlorinating
Which method of chlorination: Initial chlorine demand has been satisfied, but some
oxdizable substances remain? - Answer- Marginal chlorinating
What are some disinfectants classified under Chlorine (Cl)? - Answer- - Sodium
Hypochlorite (NaOCl)
- Chloramines
What are different types of disinfectants? - Answer- - Ozone (O3)
- Chlorine (Cl)
What are qualities of an approved disinfectant? - Answer- - Use in water before water
enters the distribution system to ensure that pathogenic microbes are destroyed
- Residual concentrations can be maintained to guard against biological contamination
in the water distribution system
What is the time requirement for collecting and analyzing for a sample that is
refrigerated? - Answer- 6 hours
What is the time requirement for collecting and analyzing for a sample that is NOT
refrigerated? - Answer- 1 hour
When should color matching be completed once the tablet has been added? - Answer-
1 minute
How should positive samples analyzed with coliert be disposed of? - Answer- - Open
each tube/ vessel and add household liquid bleach up to the top of the tube/ vessel
- Cap tightly and mix
- Let Stand 20 minutes
- Pour contents down the sink and flush with water
- Dispose of the tube/vessel
How long are samples incubated and at what temp? - Answer- 24 hours at 35° C
When are colilert results definitive? - Answer- 24-48 hours
Determine the results of the following water sample: Less yellow than the comparator -
Answer- - Sample may be incubated for an additional 4 hours
- if color does not intensify, sample is negative
TEST 1 QUESTIONS WITH 100%
CORRECT ANSWERS
What term describes: Backflow resulting from negative pressures in the distributions
pipes of potable water systems - Answer- Back- siphonage
Which step in solving a waterborne disease outbreak:
- Test hypothesis by obtaining additional information to confirm or refute their validity
- Find controls; perosn who had the same exposure but remained well - Answer-
Evaluate hypothesis
Which step in solving a waterborne disease outbreak:
- Attempts to identifies additional cases
- Confirms the existence of an outbreak - Answer- Define and identify cases
Which step in solving a waterborne disease outbreak:
- Receives complaints
- Based on disease trends in the community, determine whether there is a higher than
the expected number of cases in the community
- Ensure the complaints fit the definition of a waterborne disease outbreak - Answer-
Established the existence of an outbreak
Which step in solving a waterborne disease outbreak:
- Assembles materials
- Establishes teams - Answer- Prepare for field work
What are some sanitary standards for water storage? - Answer- - Overflows must be
located with their tops six inches above grade
- Bottom of the tank must be higher than the water table or flood water, designed for a
minimum of eight feet
- The ground around the tank must be sloped away from the tank to provide drainage
How would one remove surplus chlorine from the super chlorination method? - Answer-
With:
- Sulfur Dioxide (SO2)
- Aeration
- Activated carbon
, Which method of chlorination: Application of chlorine in greater concentrations than are
needed to afford acceptable bactericidal efficiency? - Answer- Super Chlorination
Which method of chlorination: Also refers to the application of chlorine to produce the
desired total chlorine residual without reference to the relative amounts of free or
combined chlorine present? - Answer- Marginal Chlorinating
Which method of chlorination: Initial chlorine demand has been satisfied, but some
oxdizable substances remain? - Answer- Marginal chlorinating
What are some disinfectants classified under Chlorine (Cl)? - Answer- - Sodium
Hypochlorite (NaOCl)
- Chloramines
What are different types of disinfectants? - Answer- - Ozone (O3)
- Chlorine (Cl)
What are qualities of an approved disinfectant? - Answer- - Use in water before water
enters the distribution system to ensure that pathogenic microbes are destroyed
- Residual concentrations can be maintained to guard against biological contamination
in the water distribution system
What is the time requirement for collecting and analyzing for a sample that is
refrigerated? - Answer- 6 hours
What is the time requirement for collecting and analyzing for a sample that is NOT
refrigerated? - Answer- 1 hour
When should color matching be completed once the tablet has been added? - Answer-
1 minute
How should positive samples analyzed with coliert be disposed of? - Answer- - Open
each tube/ vessel and add household liquid bleach up to the top of the tube/ vessel
- Cap tightly and mix
- Let Stand 20 minutes
- Pour contents down the sink and flush with water
- Dispose of the tube/vessel
How long are samples incubated and at what temp? - Answer- 24 hours at 35° C
When are colilert results definitive? - Answer- 24-48 hours
Determine the results of the following water sample: Less yellow than the comparator -
Answer- - Sample may be incubated for an additional 4 hours
- if color does not intensify, sample is negative
