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 purif...
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
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