WasteWater Operator Certification Study
Guide Grade 1 Test Questions and Answers
Question 1
Basic Chemistry:
Which one of the following statements concerning colloids is false?
a. solutes have a greater effect on freezing and boiling points of liquids than do
colloids
b. only very small colloids will pass through a semipermeable membrane
c. the average wavelength of white light is smaller than the dimensions of colloidal
particles
d. dialysis is the separation of colloids from solutes through a semipermeable
membrane
Correct Answer
d. dialysis is the separation of colloids from solutes through a semipermeable
membrane
Question 2
Activated Sludge:
Under normal operating conditions, what color is activated sludge
Correct Answer
dark chocolate brown
Page 1 of 26
,Question 3
Basic WasteWater Treatment:
Anaerobic bacteria will reproduce and live only in an environment that completely
lacks
Correct Answer
free or dissolved oxygen
Question 4
Maintenance:
Electromotive force (emf) is also known as
Correct Answer
voltage
Question 5
Disinfection:
What is the color of liquid chlorine?
Correct Answer
amber...
Question 6
Wastewater Solids Processing:
The solids treatment methods processes solids in a sealed unit:
Correct Answer
anaerobic digestion
Page 2 of 26
, Question 7
Basic Chemistry:
Which lab glassware will give the most accurate measurements of liquids
Correct Answer
burettes
Question 8
Waste Treatment Ponds:
When is the Dissolved Oxygen in a waste pond the lowest?
Correct Answer
sunrise
Question 9
Sampling, testing & reporting
When calibrating a pH meter, the buffers used should bracket the expected pH and
______
Correct Answer
be at least 2 pH units apart
Question 10
Preliminary Treatment:
What is the ideal wastewater velocity in FPS through a screen channel?
Correct Answer
1.5ft/s
Page 3 of 26
Guide Grade 1 Test Questions and Answers
Question 1
Basic Chemistry:
Which one of the following statements concerning colloids is false?
a. solutes have a greater effect on freezing and boiling points of liquids than do
colloids
b. only very small colloids will pass through a semipermeable membrane
c. the average wavelength of white light is smaller than the dimensions of colloidal
particles
d. dialysis is the separation of colloids from solutes through a semipermeable
membrane
Correct Answer
d. dialysis is the separation of colloids from solutes through a semipermeable
membrane
Question 2
Activated Sludge:
Under normal operating conditions, what color is activated sludge
Correct Answer
dark chocolate brown
Page 1 of 26
,Question 3
Basic WasteWater Treatment:
Anaerobic bacteria will reproduce and live only in an environment that completely
lacks
Correct Answer
free or dissolved oxygen
Question 4
Maintenance:
Electromotive force (emf) is also known as
Correct Answer
voltage
Question 5
Disinfection:
What is the color of liquid chlorine?
Correct Answer
amber...
Question 6
Wastewater Solids Processing:
The solids treatment methods processes solids in a sealed unit:
Correct Answer
anaerobic digestion
Page 2 of 26
, Question 7
Basic Chemistry:
Which lab glassware will give the most accurate measurements of liquids
Correct Answer
burettes
Question 8
Waste Treatment Ponds:
When is the Dissolved Oxygen in a waste pond the lowest?
Correct Answer
sunrise
Question 9
Sampling, testing & reporting
When calibrating a pH meter, the buffers used should bracket the expected pH and
______
Correct Answer
be at least 2 pH units apart
Question 10
Preliminary Treatment:
What is the ideal wastewater velocity in FPS through a screen channel?
Correct Answer
1.5ft/s
Page 3 of 26
