Wastewater Operator Exam Prep AZDEQ
Grade 1 & 2 (Latest ) Questions
with Answers 100% Correct {Grade A}
What does a 30-minute settleability test determine? - Correct answer the svi
What is a water sample called that is a combination of a group of samples collected at
various intervals during the day? - Correct answer composite sample
What is the holding time for a pH sample? - Correct answer there is no holding time
for pH, analyze immediately
What must be done to a sample before being poured into an evaporating dish and dried
to prepare it for determining the total dissolved solids? - Correct answer filtered
What type of glassware should be used in testing for coliform bacteria? - Correct
answer sterilized glassware
,What type of sample should be collected to analyze for coliform bacteria? - Correct
answer grab sample
When running a suspended solids test, what is the purpose of passing 20 ml of distilled
water through a filter? - Correct answer seal the filter paper to the funnel
Which of the following tests should be performed immediately in the field? - Correct
answer temperature
Which type of sample is always analyzed for pH? - Correct answer grab sample
What is the most common reason for a wastewater to contain intermittent large
amounts of sand, gravel, and grit? - Correct answer storm events
Combined wastewater is defined as: - Correct answer sanitary wastewater and storm
water runoff
In general , the solids content in wastewater is about: - Correct answer 0.1%
,In general, what is the percentage of suspended solids in the total amount of solids? -
Correct answer 30%
Generally, the percentage of dissolved solids in the amount of total solids is about: -
Correct answer 70%
Which type of organisms would most probably be associated with poor treatment or
young biomass? - Correct answer amoebas
Which type of organisms would most probably be associated with very clear plant
effluent, low biochemical oxygen demand (BOD), and low amounts of suspended
solids? - Correct answer stalked ciliates
Aerobic bacteria will reproduce and live in an environment that contains only: -
Correct answer oxygen
, Anaerobic bacteria will reproduce and live only in an environment that completely
lacks: - Correct answer free or dissolved oxygen (DO)
The biochemical oxygen demand (BOD) test usually has a specific time of: - Correct
answer 5 days
An Imhoff cone measures: - Correct answer a volume of settleable solids
Septic conditions are caused by: - Correct answer anaerobic bacteria
Scum is usually removed in the _________ treatment stage. - Correct answer primary
When domestic wastewater enters natural waters, what species deplete most of the
oxygen? - Correct answer aerobic bacteria
Once the oxygen is depleted in a natural body of water, which organisms take over? -
Correct answer anaerobic bacteria
Grade 1 & 2 (Latest ) Questions
with Answers 100% Correct {Grade A}
What does a 30-minute settleability test determine? - Correct answer the svi
What is a water sample called that is a combination of a group of samples collected at
various intervals during the day? - Correct answer composite sample
What is the holding time for a pH sample? - Correct answer there is no holding time
for pH, analyze immediately
What must be done to a sample before being poured into an evaporating dish and dried
to prepare it for determining the total dissolved solids? - Correct answer filtered
What type of glassware should be used in testing for coliform bacteria? - Correct
answer sterilized glassware
,What type of sample should be collected to analyze for coliform bacteria? - Correct
answer grab sample
When running a suspended solids test, what is the purpose of passing 20 ml of distilled
water through a filter? - Correct answer seal the filter paper to the funnel
Which of the following tests should be performed immediately in the field? - Correct
answer temperature
Which type of sample is always analyzed for pH? - Correct answer grab sample
What is the most common reason for a wastewater to contain intermittent large
amounts of sand, gravel, and grit? - Correct answer storm events
Combined wastewater is defined as: - Correct answer sanitary wastewater and storm
water runoff
In general , the solids content in wastewater is about: - Correct answer 0.1%
,In general, what is the percentage of suspended solids in the total amount of solids? -
Correct answer 30%
Generally, the percentage of dissolved solids in the amount of total solids is about: -
Correct answer 70%
Which type of organisms would most probably be associated with poor treatment or
young biomass? - Correct answer amoebas
Which type of organisms would most probably be associated with very clear plant
effluent, low biochemical oxygen demand (BOD), and low amounts of suspended
solids? - Correct answer stalked ciliates
Aerobic bacteria will reproduce and live in an environment that contains only: -
Correct answer oxygen
, Anaerobic bacteria will reproduce and live only in an environment that completely
lacks: - Correct answer free or dissolved oxygen (DO)
The biochemical oxygen demand (BOD) test usually has a specific time of: - Correct
answer 5 days
An Imhoff cone measures: - Correct answer a volume of settleable solids
Septic conditions are caused by: - Correct answer anaerobic bacteria
Scum is usually removed in the _________ treatment stage. - Correct answer primary
When domestic wastewater enters natural waters, what species deplete most of the
oxygen? - Correct answer aerobic bacteria
Once the oxygen is depleted in a natural body of water, which organisms take over? -
Correct answer anaerobic bacteria
