PMT 108 PRINCIPLES OF WATER TEST 1
QUESTIONS AND ANSWERS 100%
VERIFIED LATEST UPDATE 2025
, How should petri dishes be stored in the HPC incubation process? - ANSWER- Invert
Petri Dish
- Stack no more than 4 high
- Not touching any other stacks or sides and top of incubator
What term describes: A chemical or physical process that kills microorganisms such as
bacteria, viruses and protozoa? - ANSWERDisinfectant
Which DPD tablet is used to find: TAC? - ANSWER#4
What are the components of the LaMotte Kit? - ANSWER- Chlorine color comparator
(0.1- 1-0 mg/l)
- Chlorine color comparator (1.0-6.0 mg/l)
- pH color comparator (6.8-8.2 mg/l)
- Tablets: DPD #1 ,2, 3, 4 and phenol red
- Tablet crusher
- Test tube, glass and cap, fragile, marked at 10mL
What does the quanti-tray system contain? - ANSWER- IDEXX Sample Bottle: 100 mL
- Colilert reagent
- Quanti- Tray
- IDEXX Quanti- Tray sealer plus
Which HPC method is most often used in swimming pools? - ANSWERMembrane filter
method
What is the de-chlorninating agent found in the sample container? - ANSWERSodium
thiosulfate (Na2S2O3)
What are some factors that need to be considered when selecting a water source? -
ANSWER- Sources of pollution
- Hydrological studies
- Proposed intake
- Water uses identified for the particular water source by responsible government
agencies
What term describes: A physical separation sufficient to prevent backflow between the
free- flowing discharge end of a potable water system outlet and any other system? -
ANSWERAir Gap
QUESTIONS AND ANSWERS 100%
VERIFIED LATEST UPDATE 2025
, How should petri dishes be stored in the HPC incubation process? - ANSWER- Invert
Petri Dish
- Stack no more than 4 high
- Not touching any other stacks or sides and top of incubator
What term describes: A chemical or physical process that kills microorganisms such as
bacteria, viruses and protozoa? - ANSWERDisinfectant
Which DPD tablet is used to find: TAC? - ANSWER#4
What are the components of the LaMotte Kit? - ANSWER- Chlorine color comparator
(0.1- 1-0 mg/l)
- Chlorine color comparator (1.0-6.0 mg/l)
- pH color comparator (6.8-8.2 mg/l)
- Tablets: DPD #1 ,2, 3, 4 and phenol red
- Tablet crusher
- Test tube, glass and cap, fragile, marked at 10mL
What does the quanti-tray system contain? - ANSWER- IDEXX Sample Bottle: 100 mL
- Colilert reagent
- Quanti- Tray
- IDEXX Quanti- Tray sealer plus
Which HPC method is most often used in swimming pools? - ANSWERMembrane filter
method
What is the de-chlorninating agent found in the sample container? - ANSWERSodium
thiosulfate (Na2S2O3)
What are some factors that need to be considered when selecting a water source? -
ANSWER- Sources of pollution
- Hydrological studies
- Proposed intake
- Water uses identified for the particular water source by responsible government
agencies
What term describes: A physical separation sufficient to prevent backflow between the
free- flowing discharge end of a potable water system outlet and any other system? -
ANSWERAir Gap
