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
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?
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
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
d. sodium bisulfite - Answer: sodium thiosulfate
Methylene blue active substance (MBAS) is a test to identify
a. hardness of water
b. iron in water
c. presence of detergents containing phosphates
d. presence of coliform in bacteria - Answer: presence of detergents containing phosphates
Which organism is not known as an iron bacterium?
a. crenothrix
b. giardia lamblia
c. ferric chloride
d. leptothrix - Answer: giardia lamblia
The final product in biochemical oxidation of ammonia yields;
a. nitride
b. nitrite
, c. nitrate
d. nitrogen - Answer: nitrate
Which contaminant in water is associated with methemoglobinemia?
a. zinc
b. lead
c. copper
d. nitrate - Answer: nitrate
The substance constantly used as a coagulant in water treatment is:
a. aluminum sulfate
b. calcium sulfate
c. potassium chloride
d. sodium phosphate - Answer: aluminum sulfate
The disinfecting ability of chlorine is affected most by:
a. BOD
b. temperature
c. hydrogen ion concentration
d. dissolved oxygen - Answer: hydrogen ion concentration
Alkalinity exists in three forms, which is not one of these forms?
a. bicarbonate
b. hydroxide
c. carbonate
d. hypochlorite - Answer: hypochlorite
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
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?
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
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
d. sodium bisulfite - Answer: sodium thiosulfate
Methylene blue active substance (MBAS) is a test to identify
a. hardness of water
b. iron in water
c. presence of detergents containing phosphates
d. presence of coliform in bacteria - Answer: presence of detergents containing phosphates
Which organism is not known as an iron bacterium?
a. crenothrix
b. giardia lamblia
c. ferric chloride
d. leptothrix - Answer: giardia lamblia
The final product in biochemical oxidation of ammonia yields;
a. nitride
b. nitrite
, c. nitrate
d. nitrogen - Answer: nitrate
Which contaminant in water is associated with methemoglobinemia?
a. zinc
b. lead
c. copper
d. nitrate - Answer: nitrate
The substance constantly used as a coagulant in water treatment is:
a. aluminum sulfate
b. calcium sulfate
c. potassium chloride
d. sodium phosphate - Answer: aluminum sulfate
The disinfecting ability of chlorine is affected most by:
a. BOD
b. temperature
c. hydrogen ion concentration
d. dissolved oxygen - Answer: hydrogen ion concentration
Alkalinity exists in three forms, which is not one of these forms?
a. bicarbonate
b. hydroxide
c. carbonate
d. hypochlorite - Answer: hypochlorite
