REHS Exam questions with verified answers already
passed
clostridium sporulates
1. 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
coliform
2. The presence of which of the following is most easily
identified by laboratory analysis in water contaminat-
ed by feces?
a. shigella dysenteriae
b. coliform
c. entamoeba histolytica
d. salmonella typhosa
3. Which of the following disinfecting compounds can be sodium hypochlorite
used in full strength for disinfecting?
a. perchloron
b. calcium hypochlorite
c. chlorinated lime
d. sodium hypochlorite
4. This substance is the first product of the decomposi- b. sugar
tion of organic matter. its presence in water usually in-
dicates "fresh pollution" of sanitary significance. what
is it?
a. ammonia
,REHS Exam questions with verified answers already
passed
ammonia
,REHS Exam questions with verified answers already
passed
c. carbon dioxide
d. hydrogen sulfide
5. The presence of which of the following elements in aluminum
water treatment plant effluent is used as a measure
of filtration efficiency?
a. copper
b. aluminum
c. zinc
d. lead
6. Which of the following is not used to disinfect water? fluorine
a. chlorine
b. bromine
c. fluorine
d. iodine
7. The presence of which of the following in water would clostridium perfringens
indicate past of possibly intermittent pollution?
a. streptococcus fecalis
b. escherichia coli
c. clostridium perfringens
d. enterococci
8. Often over 90% of sodium arsenate can be removed coagulation
by
a. filtration
b. coagulation
,REHS Exam questions with verified answers already
passed
c. ion exchange
d. all of the above
9. Reduction of the level of fluorides in drinking water all of the above
can be accomplished by
a. coagulation
b. lime softening
c. ion exchange
d. all of the above
10. When collecting bacteriological samples that have sodium thiosulfate
been chlorinated, what chemical is used to chlorinate
the water?
a. sodium sulfate
b. sodium thiosulfate
c. sodium bisulfate
d. sodium bisulfite
11. Methylene blue active substance (MBAS) is a test to presence of detergents
identify containing phosphates
a. hardness of water
b. iron in water
c. presence of detergents containing phosphates
d. presence of coliform in bacteria
12. Which organism is not known as an iron bacterium? giardia lamblia
a. crenothrix
b. giardia lamblia
passed
clostridium sporulates
1. 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
coliform
2. The presence of which of the following is most easily
identified by laboratory analysis in water contaminat-
ed by feces?
a. shigella dysenteriae
b. coliform
c. entamoeba histolytica
d. salmonella typhosa
3. Which of the following disinfecting compounds can be sodium hypochlorite
used in full strength for disinfecting?
a. perchloron
b. calcium hypochlorite
c. chlorinated lime
d. sodium hypochlorite
4. This substance is the first product of the decomposi- b. sugar
tion of organic matter. its presence in water usually in-
dicates "fresh pollution" of sanitary significance. what
is it?
a. ammonia
,REHS Exam questions with verified answers already
passed
ammonia
,REHS Exam questions with verified answers already
passed
c. carbon dioxide
d. hydrogen sulfide
5. The presence of which of the following elements in aluminum
water treatment plant effluent is used as a measure
of filtration efficiency?
a. copper
b. aluminum
c. zinc
d. lead
6. Which of the following is not used to disinfect water? fluorine
a. chlorine
b. bromine
c. fluorine
d. iodine
7. The presence of which of the following in water would clostridium perfringens
indicate past of possibly intermittent pollution?
a. streptococcus fecalis
b. escherichia coli
c. clostridium perfringens
d. enterococci
8. Often over 90% of sodium arsenate can be removed coagulation
by
a. filtration
b. coagulation
,REHS Exam questions with verified answers already
passed
c. ion exchange
d. all of the above
9. Reduction of the level of fluorides in drinking water all of the above
can be accomplished by
a. coagulation
b. lime softening
c. ion exchange
d. all of the above
10. When collecting bacteriological samples that have sodium thiosulfate
been chlorinated, what chemical is used to chlorinate
the water?
a. sodium sulfate
b. sodium thiosulfate
c. sodium bisulfate
d. sodium bisulfite
11. Methylene blue active substance (MBAS) is a test to presence of detergents
identify containing phosphates
a. hardness of water
b. iron in water
c. presence of detergents containing phosphates
d. presence of coliform in bacteria
12. Which organism is not known as an iron bacterium? giardia lamblia
a. crenothrix
b. giardia lamblia
