1|Page
REHS EXAM LATEST WITH ACTUAL QUESTIONS
AND CORRECT VERIFIED ANSWERS/ALREADY
GRADED A+
Which of the following organisms are most resistant to
unfavorable environmental conditions and indicate past
of possibly intermittent pollution?
a. fecal streptococci
b. eschericha coli
c. aerobacter aerogenes
d. clostridium sporulates - .....ANSWER ...✔✔
clostridium sporulates
The presence of which of the following is most easily
identified by laboratory analysis in water contaminated
by feces?
a. shigella dysenteriae
b. coliform
c. entamoeba histolytica
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d. salmonella typhosa - .....ANSWER ...✔✔ coliform
Which of the following disinfecting compounds can be
used in full strength for disinfecting?
a. perchloron
b. calcium hypochlorite
c. chlorinated lime
d. sodium hypochlorite - .....ANSWER ...✔✔ sodium
hypochlorite
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 - .....ANSWER ...✔✔ ammonia
The presence of which of the following elements in water
treatment plant effluent is used as a measure of
filtration efficiency?
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a. copper
b. aluminum
c. zinc
d. lead - .....ANSWER ...✔✔ aluminum
Which of the following is not used to disinfect water?
a. chlorine
b. bromine
c. fluorine
d. iodine - .....ANSWER ...✔✔ fluorine
The presence of which of the following in water would
indicate past of possibly intermittent pollution?
a. streptococcus fecalis
b. escherichia coli
c. clostridium perfringens
d. enterococci - .....ANSWER ...✔✔ clostridium
perfringens
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Often over 90% of sodium arsenate can be removed by
a. filtration
b. coagulation
c. ion exchange
d. all of the above - .....ANSWER ...✔✔ coagulation
Reduction of the level of fluorides in drinking water can
be accomplished by
a. coagulation
b. lime softening
c. ion exchange
d. all of the above - .....ANSWER ...✔✔ all of the
above
When collecting bacteriological samples that have been
chlorinated, what chemical is used to chlorinate the
water?
a. sodium sulfate
b. sodium thiosulfate
c. sodium bisulfate
REHS EXAM LATEST WITH ACTUAL QUESTIONS
AND CORRECT VERIFIED ANSWERS/ALREADY
GRADED A+
Which of the following organisms are most resistant to
unfavorable environmental conditions and indicate past
of possibly intermittent pollution?
a. fecal streptococci
b. eschericha coli
c. aerobacter aerogenes
d. clostridium sporulates - .....ANSWER ...✔✔
clostridium sporulates
The presence of which of the following is most easily
identified by laboratory analysis in water contaminated
by feces?
a. shigella dysenteriae
b. coliform
c. entamoeba histolytica
,2|Page
d. salmonella typhosa - .....ANSWER ...✔✔ coliform
Which of the following disinfecting compounds can be
used in full strength for disinfecting?
a. perchloron
b. calcium hypochlorite
c. chlorinated lime
d. sodium hypochlorite - .....ANSWER ...✔✔ sodium
hypochlorite
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 - .....ANSWER ...✔✔ ammonia
The presence of which of the following elements in water
treatment plant effluent is used as a measure of
filtration efficiency?
,3|Page
a. copper
b. aluminum
c. zinc
d. lead - .....ANSWER ...✔✔ aluminum
Which of the following is not used to disinfect water?
a. chlorine
b. bromine
c. fluorine
d. iodine - .....ANSWER ...✔✔ fluorine
The presence of which of the following in water would
indicate past of possibly intermittent pollution?
a. streptococcus fecalis
b. escherichia coli
c. clostridium perfringens
d. enterococci - .....ANSWER ...✔✔ clostridium
perfringens
, 4|Page
Often over 90% of sodium arsenate can be removed by
a. filtration
b. coagulation
c. ion exchange
d. all of the above - .....ANSWER ...✔✔ coagulation
Reduction of the level of fluorides in drinking water can
be accomplished by
a. coagulation
b. lime softening
c. ion exchange
d. all of the above - .....ANSWER ...✔✔ all of the
above
When collecting bacteriological samples that have been
chlorinated, what chemical is used to chlorinate the
water?
a. sodium sulfate
b. sodium thiosulfate
c. sodium bisulfate
