REHS EXAM 240 QUESTIONS AND ANSWERS (2023-
2024) (100% CORRECT)/A+ GRADE ASSURED
• A factor or agent which increases the risk of cancer is known as a
• teratogen
• mutagen
• carcinogen
• fomite - carcinogen
• The four major causes of death among all age groups of Americans include all of
the following
except.
• homicide
• accidents
• malignant neoplasms
• heart disease - homicide
• In recent years, the largest number of rabies cases were associated with
• skunks
• bats
• dogs
• raccons. - skunks
• Asbestosis is caused by fine silicate fibers retained in the
• kidneys
• lungs
• colon
• abdomen - lungs
• An illness due to a specific infectious agent or its toxic product which is transmitted
from a
reservoir to a susceptible host either directly or indirectly is called
• an infectious disease
• a communicable disease
• a genetic disease
• a noncommunicable disease - a communicable disease
• Rocky mountain spotted fever is spread by
• flies
• spiders
,• cockroaches
• ticks - ticks
• Mycotoxins are poisonous chemicals produced by
• bacteria
• vertebrates
• viruses
• fungi - fungi
• The study of the occurrence, frequency, and distribution of disease is
• entomology
• biology
• endocrinology
• epidemiology - epidemiology
• Which of the following organisms indicates past or potentially intermittent
contamination and is most resilient to adverse environmental conditions?
• fecal streptococci
• escherichia coli
• aerobacter aerogenes
• clostridium sporulates - clostridium sporulates
• Engineering controls are
• controls that isolate or remove hazards from the work place
• less effective than good training
• the last option that should be considered
• less effective than personal protection processes - controls that isolate or
remove hazards from the workplace
• Which of the following is not considered a satisfactory solution to the problem
of chemical contamination in
Well systems?
• abandoning the well
• boiling the water
• building a new, properly constructed, drilled well - boiling the water
• Which of the following chemicals is most widely used to destroy microorganisms?
• chlorine
• copper sulfate
• chloramine
• hydrogen sulfate - chlorine
,• Which of the following is not a practical method for removal of cadmium?
• ion exchange
• lime softening
• reverse osmosis
• iron coagulation - reverse osmosis
• Which of the following is not a commonly accepted method of device to
prevent backsiphonage?
• vacuum breakers
• cross-connections
• air gap separation
• back pressure units - cross-connections
• This substance is the first product of the decomposition of organic matter. Its
presence in water usually
Indicates "fresh pollution" of sanitary significance. What is it?
• ammonia
• sugar
• carbon dioxide
• hydrogen sulfide - ammonia
• One of the most common reasons for the contamination of wells drilled through
rock, clay, or hardpan is
• seepage of pollutants through soil
• failure to seal well casings properly
• porosity of the rock
• use of inferior quality well casings - failure to seal well casings properly
• In emergencies, small quantities of water can be disinfected by boiling or using
• aluminum salts
• tincture of iodine
• salt tablets
• direct exposure to sunlight for 22 hours - tincture of iodine
• Back flow of nonpotable materials into the potable water system may occur by
• back pressure
• backsiphonage
• vacuum in the volume
• a and b above - a and b above
, • When determining where a groundwater supply is located, which of the
following statements is false?
• the probable travel of pollution through the ground
• the well construction practices and standards
• the sanitary seal provided at the point where the pump lines pass out of the casing
• the distance that the water will need to travel - the distance that the water will need
to travel
• It is known that some common pathogenic organisms found in wastewater will
survive more than
of harsh temperature extremes
• 2 months
• 5 months
• 2 years
• 5 years - 2 years
• A storm sewer is used to
• remove rain or other standing surface water
• remove sewage and storm water
• remove household water waste and gutter drain water
• remove non-toxic, non-hazardous wastewater - remove rain or other standing
surface water
• Stream pollution is sometimes apparent by
• increased levels of available oxygen in the water
• a zone of degradation
• large numbers of crayfish and cristivomer species
• large numbers of small fish - a zone of degradation
• If the septic tank will also have a garbage disposal unit feeding into it
• the size of the tank would be increased by 50 percent
• the tank should have an agiator
• the tank should not be equipped with a gas baffle
• the tank should not be constructed with precast concrete - the size of the tank would
be increased by 50 percent
• How frequently should a private home's septic tank be serviced?
• every year
• every 5 to 10 years
• every 3 to 5 years
2024) (100% CORRECT)/A+ GRADE ASSURED
• A factor or agent which increases the risk of cancer is known as a
• teratogen
• mutagen
• carcinogen
• fomite - carcinogen
• The four major causes of death among all age groups of Americans include all of
the following
except.
• homicide
• accidents
• malignant neoplasms
• heart disease - homicide
• In recent years, the largest number of rabies cases were associated with
• skunks
• bats
• dogs
• raccons. - skunks
• Asbestosis is caused by fine silicate fibers retained in the
• kidneys
• lungs
• colon
• abdomen - lungs
• An illness due to a specific infectious agent or its toxic product which is transmitted
from a
reservoir to a susceptible host either directly or indirectly is called
• an infectious disease
• a communicable disease
• a genetic disease
• a noncommunicable disease - a communicable disease
• Rocky mountain spotted fever is spread by
• flies
• spiders
,• cockroaches
• ticks - ticks
• Mycotoxins are poisonous chemicals produced by
• bacteria
• vertebrates
• viruses
• fungi - fungi
• The study of the occurrence, frequency, and distribution of disease is
• entomology
• biology
• endocrinology
• epidemiology - epidemiology
• Which of the following organisms indicates past or potentially intermittent
contamination and is most resilient to adverse environmental conditions?
• fecal streptococci
• escherichia coli
• aerobacter aerogenes
• clostridium sporulates - clostridium sporulates
• Engineering controls are
• controls that isolate or remove hazards from the work place
• less effective than good training
• the last option that should be considered
• less effective than personal protection processes - controls that isolate or
remove hazards from the workplace
• Which of the following is not considered a satisfactory solution to the problem
of chemical contamination in
Well systems?
• abandoning the well
• boiling the water
• building a new, properly constructed, drilled well - boiling the water
• Which of the following chemicals is most widely used to destroy microorganisms?
• chlorine
• copper sulfate
• chloramine
• hydrogen sulfate - chlorine
,• Which of the following is not a practical method for removal of cadmium?
• ion exchange
• lime softening
• reverse osmosis
• iron coagulation - reverse osmosis
• Which of the following is not a commonly accepted method of device to
prevent backsiphonage?
• vacuum breakers
• cross-connections
• air gap separation
• back pressure units - cross-connections
• This substance is the first product of the decomposition of organic matter. Its
presence in water usually
Indicates "fresh pollution" of sanitary significance. What is it?
• ammonia
• sugar
• carbon dioxide
• hydrogen sulfide - ammonia
• One of the most common reasons for the contamination of wells drilled through
rock, clay, or hardpan is
• seepage of pollutants through soil
• failure to seal well casings properly
• porosity of the rock
• use of inferior quality well casings - failure to seal well casings properly
• In emergencies, small quantities of water can be disinfected by boiling or using
• aluminum salts
• tincture of iodine
• salt tablets
• direct exposure to sunlight for 22 hours - tincture of iodine
• Back flow of nonpotable materials into the potable water system may occur by
• back pressure
• backsiphonage
• vacuum in the volume
• a and b above - a and b above
, • When determining where a groundwater supply is located, which of the
following statements is false?
• the probable travel of pollution through the ground
• the well construction practices and standards
• the sanitary seal provided at the point where the pump lines pass out of the casing
• the distance that the water will need to travel - the distance that the water will need
to travel
• It is known that some common pathogenic organisms found in wastewater will
survive more than
of harsh temperature extremes
• 2 months
• 5 months
• 2 years
• 5 years - 2 years
• A storm sewer is used to
• remove rain or other standing surface water
• remove sewage and storm water
• remove household water waste and gutter drain water
• remove non-toxic, non-hazardous wastewater - remove rain or other standing
surface water
• Stream pollution is sometimes apparent by
• increased levels of available oxygen in the water
• a zone of degradation
• large numbers of crayfish and cristivomer species
• large numbers of small fish - a zone of degradation
• If the septic tank will also have a garbage disposal unit feeding into it
• the size of the tank would be increased by 50 percent
• the tank should have an agiator
• the tank should not be equipped with a gas baffle
• the tank should not be constructed with precast concrete - the size of the tank would
be increased by 50 percent
• How frequently should a private home's septic tank be serviced?
• every year
• every 5 to 10 years
• every 3 to 5 years
