NEHA Wastewater Practice Test Exam
Questions & Answers (Grade A+)
Man-made organic compounds that degrade very slowly are
referred to as -
correct answer ✅Refractory organics
Which of the following are least important in reducing sewage to
"soil" liquids, and gases? -
correct answer ✅Anaerobic bacteria
When storm water and domestic sewage enter the same sewer it is
known as a -
correct answer ✅Combined sewer
How often should a septic tank for a private home be serviced? -
correct answer ✅Every 3-5 years
A young lake is considered to be -
correct answer ✅Oligotrophic
The effectiveness of disinfection depends on -
correct answer ✅The degree of treatment the sewerage has
received, the amount of chlorine used, and the residual chlorine,
and the mixing and retention period
, NEHA Wastewater Practice Test Exam
Questions & Answers (Grade A+)
Why is the proper disposal of sewage necessary? -
correct answer ✅It reduces illness in the population, it provides
comfort for individuals, it reduces the pollution of surface
groundwater
Which of the following is true regarding the use of septic-tank
cleaners? -
correct answer ✅Their use is not advised
The top of the absorption field gravel should be covered with -
correct answer ✅Permeable material
Plants employing trickling filters, activated sludge, and spray
irrigation present a possible health hazard to their employees due
to -
correct answer ✅Inhalation of airborne microorganisms
The traditional absorption field should be laid in trenches not more
than _____below the ground surface. -
correct answer ✅24 inches
Questions & Answers (Grade A+)
Man-made organic compounds that degrade very slowly are
referred to as -
correct answer ✅Refractory organics
Which of the following are least important in reducing sewage to
"soil" liquids, and gases? -
correct answer ✅Anaerobic bacteria
When storm water and domestic sewage enter the same sewer it is
known as a -
correct answer ✅Combined sewer
How often should a septic tank for a private home be serviced? -
correct answer ✅Every 3-5 years
A young lake is considered to be -
correct answer ✅Oligotrophic
The effectiveness of disinfection depends on -
correct answer ✅The degree of treatment the sewerage has
received, the amount of chlorine used, and the residual chlorine,
and the mixing and retention period
, NEHA Wastewater Practice Test Exam
Questions & Answers (Grade A+)
Why is the proper disposal of sewage necessary? -
correct answer ✅It reduces illness in the population, it provides
comfort for individuals, it reduces the pollution of surface
groundwater
Which of the following is true regarding the use of septic-tank
cleaners? -
correct answer ✅Their use is not advised
The top of the absorption field gravel should be covered with -
correct answer ✅Permeable material
Plants employing trickling filters, activated sludge, and spray
irrigation present a possible health hazard to their employees due
to -
correct answer ✅Inhalation of airborne microorganisms
The traditional absorption field should be laid in trenches not more
than _____below the ground surface. -
correct answer ✅24 inches
