WASTEWATER MA MUNICIPAL
GRADE 4 EXAM QUESTIONS AND
ANSWERS 2026 - 2027
Wastewater is the same as:
A. Rain
B. Soil
C. Sewage
D. Condensation - ANSWERS-C. sewage
What does an operator do?
A. Collect samples
B. Lubricate equipment
C. Record data - ANSWERS-All of the above
Who employs treatment plant operators?
A. Cities
B. Sanitation Districts
C. Industries - ANSWERS-All of the above
How did many receiving waters become polluted? - ANSWERS-
Receiving waters become polluted by a lack of public concern for the
,impact of waste discharge and by discharging wastewater into
receiving water beyond its natural purification (cleaning) capacity
Why must municipal (city/town) and industrial wastewaters receive
adequate treatment? - ANSWERS-Municipal and industrial
wastewaters must receive adequate treatment to protect receiving
waters users
Why is it important that the operator be present during the
construction of a new plant? - ANSWERS-The operator should be
present during the construction of a new plant in order to become
familiar with the plant before the operator begins operating it.
How does the operator become involved in public relations? -
ANSWERS-By explaining the purpose and operation of the plant to
visitors, civic organizations, school classes, news reporters, and city
or district representatives.
How does water pick up dissolved substances? - ANSWERS-Water
picks up dissolved substances as it falls as rain, flows over land, and
is used for domestic, industrial, agricultural, and recreational
purposes.
What are some of the dissolved substances in water? - ANSWERS-
Hydrogen, oxygen, calcium, carbon, magnesium, sodium, chloride,
sulfate, iron, nitrogen, phosphorus, and organic material
Several of the following contain significant quantities of
, organic material. Which are they?
a. Domestic wastewater
b. Cooling water from thermal power stations
c. Paper mill waste
d. Metal plating wastes
e. Tanning wastes - ANSWERS-A, C , D
List four types of pollution - ANSWERS-Organic, inorganic, thermal
and radioactive pollution.
What causes oxygen depletion(take from) when organic wastes are
discharged to the water? - ANSWERS-Organic (live/once live) in
water provide food for bacteria.
The bacteria use oxygen to survive and take it from the water.
What kind of bacteria cause hydrogen sulfide gas to be released? -
ANSWERS-Hydrogen sulfide gas is produced by anaerobic bacteria.
A waste with a high BOD and low suspended solids indicates that a
major portion of the solids are in - ANSWERS-Suspension
Mill town pump station has 2 pumps and each pump can deliver 300
gallons per minute. THe forcemain out of the station is 12 inches .
........the forcemain when 1 pump is operating? - ANSWERS-0.85
Feet Per Second
GRADE 4 EXAM QUESTIONS AND
ANSWERS 2026 - 2027
Wastewater is the same as:
A. Rain
B. Soil
C. Sewage
D. Condensation - ANSWERS-C. sewage
What does an operator do?
A. Collect samples
B. Lubricate equipment
C. Record data - ANSWERS-All of the above
Who employs treatment plant operators?
A. Cities
B. Sanitation Districts
C. Industries - ANSWERS-All of the above
How did many receiving waters become polluted? - ANSWERS-
Receiving waters become polluted by a lack of public concern for the
,impact of waste discharge and by discharging wastewater into
receiving water beyond its natural purification (cleaning) capacity
Why must municipal (city/town) and industrial wastewaters receive
adequate treatment? - ANSWERS-Municipal and industrial
wastewaters must receive adequate treatment to protect receiving
waters users
Why is it important that the operator be present during the
construction of a new plant? - ANSWERS-The operator should be
present during the construction of a new plant in order to become
familiar with the plant before the operator begins operating it.
How does the operator become involved in public relations? -
ANSWERS-By explaining the purpose and operation of the plant to
visitors, civic organizations, school classes, news reporters, and city
or district representatives.
How does water pick up dissolved substances? - ANSWERS-Water
picks up dissolved substances as it falls as rain, flows over land, and
is used for domestic, industrial, agricultural, and recreational
purposes.
What are some of the dissolved substances in water? - ANSWERS-
Hydrogen, oxygen, calcium, carbon, magnesium, sodium, chloride,
sulfate, iron, nitrogen, phosphorus, and organic material
Several of the following contain significant quantities of
, organic material. Which are they?
a. Domestic wastewater
b. Cooling water from thermal power stations
c. Paper mill waste
d. Metal plating wastes
e. Tanning wastes - ANSWERS-A, C , D
List four types of pollution - ANSWERS-Organic, inorganic, thermal
and radioactive pollution.
What causes oxygen depletion(take from) when organic wastes are
discharged to the water? - ANSWERS-Organic (live/once live) in
water provide food for bacteria.
The bacteria use oxygen to survive and take it from the water.
What kind of bacteria cause hydrogen sulfide gas to be released? -
ANSWERS-Hydrogen sulfide gas is produced by anaerobic bacteria.
A waste with a high BOD and low suspended solids indicates that a
major portion of the solids are in - ANSWERS-Suspension
Mill town pump station has 2 pumps and each pump can deliver 300
gallons per minute. THe forcemain out of the station is 12 inches .
........the forcemain when 1 pump is operating? - ANSWERS-0.85
Feet Per Second
