MCB Final Actual Questions and
CORRECT Answers
Using microbes to break down or remove toxic wastes in water and soil is called -
CORRECT ANSWER- ✔✔bioremediation
The breakdown of man-made compounds by decomposers is called - CORRECT ANSWER-
✔✔biodegradation
Which is the first step in water purification? - CORRECT ANSWER- ✔✔Sedimentation
In which step of water purification does water move through sand beds and activated
charcoal? - CORRECT ANSWER- ✔✔filtration
Primary sewage treatment includes - CORRECT ANSWER- ✔✔skimming
The final step of sewage treatment before release into the environment is - CORRECT
ANSWER- ✔✔chlorination
What chemical is used in both water purification and sewage treatment to give long-term
disinfection? - CORRECT ANSWER- ✔✔chlorine
An infectious disease typically seen among animals that may be acquired by humans is
referred to as - CORRECT ANSWER- ✔✔zoonotic
What two strategies are used in the United States to ensure potable drinking water? -
CORRECT ANSWER- ✔✔Filtration and chlorination
One of the goals of wastewater treatment is to __________ the biological oxygen demand
(BOD) - CORRECT ANSWER- ✔✔decrease
, The primary phase of waste water treatment _______________ - CORRECT ANSWER-
✔✔separates solid from liquid wastes
The secondary phase of wastewater treatment is largely - CORRECT ANSWER-
✔✔biological
The primary phase of wastewater treatment is largely - CORRECT ANSWER- ✔✔physical
Use of a trickling filter that sprays wastewater over rocks coated with biofilms which
aerobically degrade organic matter is an example of the ____________ - CORRECT
ANSWER- ✔✔secondary phase of wastewater treatment
The activated sludge step in wastewater treatment is an example of the
__________________________ - CORRECT ANSWER- ✔✔tertiary phase of wastewater
treatment
Which of the following may be removed by tertiary water treatment? - CORRECT
ANSWER- ✔✔All of the choices are correct
Agricultural water run-off, rich in nitrates, ammonia, and phosphates, may be treated to
remove these chemicals so that the treated water does not support algal blooms. Such
treatment is an example of _________________. - CORRECT ANSWER- ✔✔tertiary
treatment
Which wastewater treatment process can generate methane which to be used as a fuel? -
CORRECT ANSWER- ✔✔Anaerobic digestors
Backyard composting in either a pile or a bin is generally an _______________ process. -
CORRECT ANSWER- ✔✔aerobic
The decomposition that occurs in a sanitary landfill is largely _________ - CORRECT
ANSWER- ✔✔anaerobic
CORRECT Answers
Using microbes to break down or remove toxic wastes in water and soil is called -
CORRECT ANSWER- ✔✔bioremediation
The breakdown of man-made compounds by decomposers is called - CORRECT ANSWER-
✔✔biodegradation
Which is the first step in water purification? - CORRECT ANSWER- ✔✔Sedimentation
In which step of water purification does water move through sand beds and activated
charcoal? - CORRECT ANSWER- ✔✔filtration
Primary sewage treatment includes - CORRECT ANSWER- ✔✔skimming
The final step of sewage treatment before release into the environment is - CORRECT
ANSWER- ✔✔chlorination
What chemical is used in both water purification and sewage treatment to give long-term
disinfection? - CORRECT ANSWER- ✔✔chlorine
An infectious disease typically seen among animals that may be acquired by humans is
referred to as - CORRECT ANSWER- ✔✔zoonotic
What two strategies are used in the United States to ensure potable drinking water? -
CORRECT ANSWER- ✔✔Filtration and chlorination
One of the goals of wastewater treatment is to __________ the biological oxygen demand
(BOD) - CORRECT ANSWER- ✔✔decrease
, The primary phase of waste water treatment _______________ - CORRECT ANSWER-
✔✔separates solid from liquid wastes
The secondary phase of wastewater treatment is largely - CORRECT ANSWER-
✔✔biological
The primary phase of wastewater treatment is largely - CORRECT ANSWER- ✔✔physical
Use of a trickling filter that sprays wastewater over rocks coated with biofilms which
aerobically degrade organic matter is an example of the ____________ - CORRECT
ANSWER- ✔✔secondary phase of wastewater treatment
The activated sludge step in wastewater treatment is an example of the
__________________________ - CORRECT ANSWER- ✔✔tertiary phase of wastewater
treatment
Which of the following may be removed by tertiary water treatment? - CORRECT
ANSWER- ✔✔All of the choices are correct
Agricultural water run-off, rich in nitrates, ammonia, and phosphates, may be treated to
remove these chemicals so that the treated water does not support algal blooms. Such
treatment is an example of _________________. - CORRECT ANSWER- ✔✔tertiary
treatment
Which wastewater treatment process can generate methane which to be used as a fuel? -
CORRECT ANSWER- ✔✔Anaerobic digestors
Backyard composting in either a pile or a bin is generally an _______________ process. -
CORRECT ANSWER- ✔✔aerobic
The decomposition that occurs in a sanitary landfill is largely _________ - CORRECT
ANSWER- ✔✔anaerobic
