AALSO Water Quality Practice Exam
Questions and Answers
Salinity is commonly measured using which unit.
A. CFU
B. NTU
C. mg/L
D. ppt - Correct Answers -D.
How would you prepare 100 mL of 0.400 M KCL from 0.200 M KCl stock solution
A. Withdraw 10.0 mL of 0.200 M KCl, place it in a partially filled 100 mL volumetric flask
and add water until the final volume is 100 mL.
B. Withdraw 20.0 mL of 0.200 M KCl, place it in a partially filled 100 mL volumetric flask
and add water until the final volume is 100 mL.
C. Withdraw 40.0 mL of 0.200 M KCl, place it in a partially filled 100 mL volumetric flask
and add water until the final volume is 100 mL.
D. Withdraw 50.0 mL of 0.200 M KCl, place it in a partially filled 100 mL volumetric flask
and add water until the final volume is 100 mL. - Correct Answers -B. Withdraw 20.0 mL
of 0.200 M KCl, place it in a partially filled 100 mL volumetric flask and add water until
the final volume is 100 mL.
Which of the following is not considered Laboratory Personal Protective Equipment
(PPE)
A. Safety Glasses
B. Hair Tie
C. Face Shield
D. Lab Coat - Correct Answers -B. Hair tie
A freshwater system with a carbon filter is tested weekly for chlorine, with a normal
result of 1.0ppm pre-filter and n/d post-filter. A DPD test today shows a value of 0.8ppm
post-filter. After performing a retest and getting a similar result, what is the next thing
you should do?
A. Check the date the carbon in the filter was last changed
B. Perform a total organic carbon analysis of the water
C. Test the alkalinity of the incoming water
D. Nothing, that value indicates no reason for further investigation - Correct Answers -C.
Test the alkalinity of the incoming water
SDS is short for:
, A. Safest Defensive Strategy
B. Simple Dissolved Substance
C. Safety Data Sheet
D. Safe Data Set - Correct Answers -C. Safety Data Sheet
What is the preferred glassware to use when doing a dilution?
A. Erlenmeyer flask
B. Graduated Cylinder
C. Volumetric Flask
D. Beaker - Correct Answers -C. Volumetric Flask
Which of the following is a concern after a chemical spill?
A. Environmental release
B. Adequate engineering controls or PPE to protect staff during cleanup
C. Slip or Trip Hazard
D. All of the above - Correct Answers -D. All of the above.
Where should flammable liquids be stored?
A. In a fume hood
B. In a locked cabinet
C. In the bed of a pickup truck D. In an approved flammable liquid storage cabinet -
Correct Answers -D. In an approved flammable liquid storage
If a water quality laboratory technician records data incorrectly, how should they
respond?
A. Erase the misprint so it cannot be misinterpreted by husbandry staff
B. Draw a single line through the entry making sure that the inaccurate information is
still legible. Initial and date the entry. State the reason for the error. Document the
correct information.
C. Re-record the worksheet so the data is easy to read
D. Do not make any alterations to the record - Correct Answers -B. Draw a single line
through the entry making sure that the inaccurate information is still legible. Initial and
date the entry. State the reason for the error. Document the correct information.
Why should you never add water to acid?
A. The exothermic reaction could possibly splash the content (acid) out of the
container.
B. The endothermic reaction could freeze the container causing it to shatter.
C. It would neutralize the acid too much to render it useless.
D. Nothing would happen. There is no difference if you add water to acid or acid to
water. - Correct Answers -A. The exothermic reaction could possibly splash the content
(acid) out of the container.
Which of the following is not a disinfection byproduct of chlorine disinfection?
A. Sodium hypochlorite
B. Trihalomethane compounds
Questions and Answers
Salinity is commonly measured using which unit.
A. CFU
B. NTU
C. mg/L
D. ppt - Correct Answers -D.
How would you prepare 100 mL of 0.400 M KCL from 0.200 M KCl stock solution
A. Withdraw 10.0 mL of 0.200 M KCl, place it in a partially filled 100 mL volumetric flask
and add water until the final volume is 100 mL.
B. Withdraw 20.0 mL of 0.200 M KCl, place it in a partially filled 100 mL volumetric flask
and add water until the final volume is 100 mL.
C. Withdraw 40.0 mL of 0.200 M KCl, place it in a partially filled 100 mL volumetric flask
and add water until the final volume is 100 mL.
D. Withdraw 50.0 mL of 0.200 M KCl, place it in a partially filled 100 mL volumetric flask
and add water until the final volume is 100 mL. - Correct Answers -B. Withdraw 20.0 mL
of 0.200 M KCl, place it in a partially filled 100 mL volumetric flask and add water until
the final volume is 100 mL.
Which of the following is not considered Laboratory Personal Protective Equipment
(PPE)
A. Safety Glasses
B. Hair Tie
C. Face Shield
D. Lab Coat - Correct Answers -B. Hair tie
A freshwater system with a carbon filter is tested weekly for chlorine, with a normal
result of 1.0ppm pre-filter and n/d post-filter. A DPD test today shows a value of 0.8ppm
post-filter. After performing a retest and getting a similar result, what is the next thing
you should do?
A. Check the date the carbon in the filter was last changed
B. Perform a total organic carbon analysis of the water
C. Test the alkalinity of the incoming water
D. Nothing, that value indicates no reason for further investigation - Correct Answers -C.
Test the alkalinity of the incoming water
SDS is short for:
, A. Safest Defensive Strategy
B. Simple Dissolved Substance
C. Safety Data Sheet
D. Safe Data Set - Correct Answers -C. Safety Data Sheet
What is the preferred glassware to use when doing a dilution?
A. Erlenmeyer flask
B. Graduated Cylinder
C. Volumetric Flask
D. Beaker - Correct Answers -C. Volumetric Flask
Which of the following is a concern after a chemical spill?
A. Environmental release
B. Adequate engineering controls or PPE to protect staff during cleanup
C. Slip or Trip Hazard
D. All of the above - Correct Answers -D. All of the above.
Where should flammable liquids be stored?
A. In a fume hood
B. In a locked cabinet
C. In the bed of a pickup truck D. In an approved flammable liquid storage cabinet -
Correct Answers -D. In an approved flammable liquid storage
If a water quality laboratory technician records data incorrectly, how should they
respond?
A. Erase the misprint so it cannot be misinterpreted by husbandry staff
B. Draw a single line through the entry making sure that the inaccurate information is
still legible. Initial and date the entry. State the reason for the error. Document the
correct information.
C. Re-record the worksheet so the data is easy to read
D. Do not make any alterations to the record - Correct Answers -B. Draw a single line
through the entry making sure that the inaccurate information is still legible. Initial and
date the entry. State the reason for the error. Document the correct information.
Why should you never add water to acid?
A. The exothermic reaction could possibly splash the content (acid) out of the
container.
B. The endothermic reaction could freeze the container causing it to shatter.
C. It would neutralize the acid too much to render it useless.
D. Nothing would happen. There is no difference if you add water to acid or acid to
water. - Correct Answers -A. The exothermic reaction could possibly splash the content
(acid) out of the container.
Which of the following is not a disinfection byproduct of chlorine disinfection?
A. Sodium hypochlorite
B. Trihalomethane compounds
