WATER NUGGETS PRACTICE EXAM QUESTIONS &
ANSWERS
What chemical may encourage growth of algae and microorganisms? - Answers - Zinc
Orthophosphates
What does a high pH favor the formation of? ** - Answers - Total Trihalomethanes
What is the best type of salt to use in the regeneration of ion exchange softener resin?**
- Answers - Rock salt or pellet type salt
Free chlorine residual values are based on contact time of at least? - Answers - 10
mins
Evaporated water in the earth's atmosphere will condense to form? - Answers - cloud
formations
What conditions in a gravity filter will be produced when there is a larger particle size
and less dense anthracite media?** - Answers - Longer filter runs and a greater
filtration rate
By what factor does the hydrogen ion concentration change when the pH changes from
8.0 to 9.0? - Answers - 10
What tests are performed most frequently in drinking water systems? - Answers -
Turbidity and Coliform Bacteria
What is the most important reason to reduce turbidity? - Answers - remove pathogens
When should polyphosphates used for sequestration of iron and manganese from a well
be injected? - Answers - Right After the Water Leaves the Well
When responding to a chlorine gas leak, the responder should have a SCBA and a?** -
Answers - Level A suit
Waterborne diseases like typhoid and cholera are caused by?** - Answers - Bacteria
What type of polar bonds are between the hydrogen atoms and the oxygen atom in
water?** - Answers - covalent bonds
Dissolved-Air flotation is particularly good for? - Answers - Removing algae
What is the MCL for THM's? - Answers - 0.080 mg/L or 80 ppb
, One of the ways an optimum coagulant dosage can be established is? - Answers -
Performing a jar test
Who can declare the vulnerability of a water source?** - Answers - 1. A contractor or
consultant
2. The state
3. The water purveyor
What will cause reverse osmosis membranes to compact faster? - Answers - high
pressure
Current regulations require that water treatment wastes be monitored? - Answers -
Daily
What water rights are acquired from diverting a water source and then putting it to
beneficial use? ** - Answers - appropriative
What happens when there is high algae growth in a reservoir? - Answers - DO and pH
Increase while CO2 Decrease
What is measured to determine total alkalinity? ** - Answers - Amount of acid required
to change the pH into the 3.7-4.8 range
What is the most efficient process for the removal of nitrate and nitrate? ** - Answers -
anion exchange
Ion exchange processes can typically be used for direct groundwater treatment as long
as turbidity and what else have levels that are not excessive? - Answers - Iron
What chemical oxidant is most effective in reducing the concentration of taste and odor
compounds caused by actinomycetes species? - Answers - Peroxone
Manganese is rarely found in surface waters above a concentration of? ** - Answers -
1.0 mg/L
What are the chemical symbols for hypochlorous acid and hypochlorite ions? - Answers
- HOCI & OCI-
Improper backwashing of the filter media can lead to? - Answers - Mud ball formation
The size of Giardia in the trophozoite stage is approximately? - Answers - 10-15 um
Turbidity particles will settle more quickly and uniformly in a sedimentation basin when
there is?** - Answers - No short circuiting
ANSWERS
What chemical may encourage growth of algae and microorganisms? - Answers - Zinc
Orthophosphates
What does a high pH favor the formation of? ** - Answers - Total Trihalomethanes
What is the best type of salt to use in the regeneration of ion exchange softener resin?**
- Answers - Rock salt or pellet type salt
Free chlorine residual values are based on contact time of at least? - Answers - 10
mins
Evaporated water in the earth's atmosphere will condense to form? - Answers - cloud
formations
What conditions in a gravity filter will be produced when there is a larger particle size
and less dense anthracite media?** - Answers - Longer filter runs and a greater
filtration rate
By what factor does the hydrogen ion concentration change when the pH changes from
8.0 to 9.0? - Answers - 10
What tests are performed most frequently in drinking water systems? - Answers -
Turbidity and Coliform Bacteria
What is the most important reason to reduce turbidity? - Answers - remove pathogens
When should polyphosphates used for sequestration of iron and manganese from a well
be injected? - Answers - Right After the Water Leaves the Well
When responding to a chlorine gas leak, the responder should have a SCBA and a?** -
Answers - Level A suit
Waterborne diseases like typhoid and cholera are caused by?** - Answers - Bacteria
What type of polar bonds are between the hydrogen atoms and the oxygen atom in
water?** - Answers - covalent bonds
Dissolved-Air flotation is particularly good for? - Answers - Removing algae
What is the MCL for THM's? - Answers - 0.080 mg/L or 80 ppb
, One of the ways an optimum coagulant dosage can be established is? - Answers -
Performing a jar test
Who can declare the vulnerability of a water source?** - Answers - 1. A contractor or
consultant
2. The state
3. The water purveyor
What will cause reverse osmosis membranes to compact faster? - Answers - high
pressure
Current regulations require that water treatment wastes be monitored? - Answers -
Daily
What water rights are acquired from diverting a water source and then putting it to
beneficial use? ** - Answers - appropriative
What happens when there is high algae growth in a reservoir? - Answers - DO and pH
Increase while CO2 Decrease
What is measured to determine total alkalinity? ** - Answers - Amount of acid required
to change the pH into the 3.7-4.8 range
What is the most efficient process for the removal of nitrate and nitrate? ** - Answers -
anion exchange
Ion exchange processes can typically be used for direct groundwater treatment as long
as turbidity and what else have levels that are not excessive? - Answers - Iron
What chemical oxidant is most effective in reducing the concentration of taste and odor
compounds caused by actinomycetes species? - Answers - Peroxone
Manganese is rarely found in surface waters above a concentration of? ** - Answers -
1.0 mg/L
What are the chemical symbols for hypochlorous acid and hypochlorite ions? - Answers
- HOCI & OCI-
Improper backwashing of the filter media can lead to? - Answers - Mud ball formation
The size of Giardia in the trophozoite stage is approximately? - Answers - 10-15 um
Turbidity particles will settle more quickly and uniformly in a sedimentation basin when
there is?** - Answers - No short circuiting
