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REHS exam Questions with Explanations of Answers
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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
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
100. "Swimmers itch" is also known as
a. gastroenteritis
b. trichinosis
✅✅
c. schistosomiasis
d. leptospirosis - -schistosomiasis
101. Rodents are the primary reservoir/host of the hantavirus. In particular,
_______ appears to be the primary
Reservoir for the newly recognized (1993) hantavirus in the southeastern US.
a. rat
b. rabbit
✅✅
c. house mouse
d. deer mouse - -deer mouse
102. Bacteria may be carried in the digestive system of the housefly for as
long as
a. 1 week
b. 3 months
✅✅
c. 4 weeks
d. 2 days - -4 weeks
103. Pediculosis is an infestation of
a. chiggers
b. mites
c. lice
,d. roaches - ✅✅-lice
104. ___________is an infectious disease of the skin caused by burrowing of
the female mite into the skin where
it deposits its eggs.
a. tularemia
b. scabies
✅✅
c. psittacosis
d. pediculosis - -scabies
105. Rattus Rattus is also referred to as the
a. house rat
b. norway rat
✅✅
c. roof rat
d. all of the above - -roof rat
106. Psittacosis/Ornithosis is spread by
a. bats
b. shellfish
✅✅
c. rodents
d. pigeons - -pigeons
107. In general, there are three kinds of weeds. These are
a. srads, clowds, and mullahs
b. bronzes, slorles, and direals
✅✅
c. annuals, biennials, and perennials
d. milkweeds, bindweeds, and perennials - -annuals, biennials, and
perennials
108. A pollen count index of less than _____ pollen grains/m3 of air in a 24
hour period is considered
practically free of ragweed contamination.
a. 1
b. 5
✅✅
c. 20
d. 40 - -5
109. A minimum of _____ of sleeping area per person is required in the APHA
appraisal method.
a. 10ft2
,b. 20ft2
✅✅-40 ft2
c. 40 ft2
d. 60 ft2 -
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
110. The ASHRAE recommended minimal thermal standard for dwellings is
___________ F at 40%
humidity and an air circulation rate of 45 fpm.
a. 57oF
b. 60oF
✅✅
c. 68oF
d. 76oF - -76 F
111. The drain line of an ice machine should connect to the sewer system
through
a. a grease trap
b. a direct connection below floor level
✅✅
c. an open receptacle with an air gap
d. a backflow preventer properly vented - -an open receptacle with an
air gap
112. Nosocomial infections are a recurring problem in
a. food establishments
b. hospitals
✅✅
c. swimming pools
d. health spas - -hospitals
113. Minimum wash water temperature in a hospital laundry is
a. 146 to 150oF
b. 160 to 167oF
✅✅
c. 170 to 178oF
d. 185 to 196oF - -160 to 167 F
, 114. Lead levels exceeded 10ug/dL in ____ U.S. children aged 6 and under in
1990
a. 300,000
b. 3,000
✅✅
c. 1,000,000
d. 3,000,000 - -3,000,000
115. Most urban dwellers spend what percent of their total time indoors
a. 10 to 20%
b. 25 to 50%
✅✅
c. 80 to 90%
d. 70 to 80% - -80 to 90%
116. Which of the following is the primary cause of indoor air quality
problems>
a. inadequate ventilation
b. contaminated outside air
✅✅
c. radon
d. ragweed - -inadequate ventilation
117. Radon is detected in a home through the use of instrumentation that
measures
a. geiger rays
b. beta particles
✅✅
c. alpha particles
d. UV rays - -alpha particles
118. To prevent chimney backdrafts, the chimney must be constructed ___
inches above the highest point of the
roof at a minimum
a. 4 inches
b. 8 inches
✅✅
c. 24 inches
d. 48 inches - -24 inches
119. A biohazard is
a. any material that negatively impacts a biological organism
b. a material of biological composition, especially if ineffective, that constitutes
a threat to man or his
environment
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