Exam (elaborations)
REHS exam
Exam of 36 pages for the course RD Exa at RD Exa (REHS exam)
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REHS exam1. A factor or agent which increases the risk of cancer is known as a
a. teratogen
b. mutagen
✅✅
c. carcinogen
d. fomite - -carcinogen
2. The four major causes of death among all age groups of Americans include all of
the following
except.
a. homicide
b. accidents
✅✅
c. malignant neoplasms
d. heart disease - -homicide
3. In recent years, the largest number of rabies cases were associated with
a. skunks
b. bats
✅✅
c. dogs
d. raccons. - -skunks
4. Asbestosis is caused by fine silicate fibers retained in the
a. kidneys
b. lungs
✅✅
c. colon
d. abdomen - -lungs
5. 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
a. an infectious disease
b. a communicable disease
✅✅
c. a genetic disease
d. a noncommunicable disease - -a communicable disease
6. Rocky mountain spotted fever is spread by
a. flies
b. spiders
✅✅
c. cockroaches
d. ticks - -ticks
7. Mycotoxins are poisonous chemicals produced by
a. bacteria
,b. vertebrates
✅✅
c. viruses
d. fungi - -fungi
8. The study of the occurrence, frequency, and distribution of disease is
a. entomology
b. biology
✅✅
c. endocrinology
d. epidemiology - -epidemiology
9. Which of the following organisms are most resistant to unfavorable environmental
conditions and indicate
past or possibly intermittent pollution?
a. fecal streptococci
b. escherichia coli
✅✅
c. aerobacter aerogenes
d. clostridium sporulates - -clostridium sporulates
10. Engineering controls are
a. controls that isolate or remove hazards from the work place
b. less effective than good training
✅✅
c. the last option that should be considered
d. less effective than personal protection processes - -controls that isolate or
remove hazards from the workplace
11. Which of the following is not considered a satisfactory solution to the problem of
chemical contamination in
Well systems?
a. abandoning the well
✅✅
b. boiling the water
c. building a new, properly constructed, drilled well - -boiling the water
12. Which of the following chemicals is most widely used to destroy
microorganisms?
a. chlorine
b. copper sulfate
✅✅
c. chloramine
d. hydrogen sulfate - -chlorine
13. Which of the following is not a practical method for removal of cadmium?
a. ion exchange
b. lime softening
✅✅
c. reverse osmosis
d. iron coagulation - -reverse osmosis
,14. Which of the following is not a commonly accepted method of device to prevent
backsiphonage?
a. vacuum breakers
b. cross-connections
✅✅
c. air gap separation
d. back pressure units - -cross-connections
15. 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?
a. ammonia
b. sugar
✅✅
c. carbon dioxide
d. hydrogen sulfide - -ammonia
16. One of the most common reasons for the contamination of wells drilled through
rock, clay, or hardpan is
a. seepage of pollutants through soil
b. failure to seal well casings properly
✅✅
c. porosity of the rock
d. use of inferior quality well casings - -failure to seal well casings properly
17. In emergencies, small quantities of water can be disinfected by boiling or using
a. aluminum salts
b. tincture of iodine
✅✅
c. salt tablets
d. direct exposure to sunlight for 22 hours - -tincture of iodine
18. Back flow of nonpotable materials into the potable water system may occur by
a. back pressure
b. backsiphonage
✅✅
c. vacuum in the volume
d. a and b above - -a and b above
19. Which of the following statements should not be a consideration in locating a
groundwater supply?
a. the probable travel of pollution through the ground
b. the well construction practices and standards
c. the sanitary seal provided at the point where the pump lines pass out of the
✅✅
casing
d. the distance that the water will need to travel - -the distance that the water
will need to travel
, 20. It is known that some common pathogenic organisms found in wastewater will
survive more than ____
of harsh temperature extremes
a. 2 months
b. 5 months
✅✅
c. 2 years
d. 5 years - -2 years
21. A storm sewer is used to
a. remove rain or other standing surface water
b. remove sewage and storm water
✅✅
c. remove household water waste and gutter drain water
d. remove non-toxic, non-hazardous wastewater - -remove rain or other
standing surface water
22. Stream pollution is sometimes apparent by
a. increased levels of available oxygen in the water
b. a zone of degradation
✅✅
c. large numbers of crayfish and cristivomer species
d. large numbers of small fish - -a zone of degradation
23. If the septic tank will also have a garbage disposal unit feeding into it
a. the size of the tank would be increased by 50 percent
b. the tank should have an agiator
✅✅-the size of the
c. the tank should not be equipped with a gas baffle
d. the tank should not be constructed with precast concrete -
tank would be increased by 50 percent
24. How often should a septic tank for a private home be serviced?
a. every year
b. every 5 to 10 years
✅✅-every 3 to 5 years
c. every 3 to 5 years
d. every 10 years -
25. Plants absorb certain constituents of wastewater, using wastewater for irrigation
of consumable plant products
may present a health hazard to humans if the water contains
a. nitrates
b. iron
✅✅-cadmium
c. cadmium
d. chlorides -
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