REHS ACTUAL EXAM -2 VERSIONS WITH 300 ACCURATE

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REHS ACTUAL EXAM -2 VERSIONS WITH 300+ ACCURATE

QUESTIONS AND DETAILED ANSWERS EXPERT VERIFIED LATEST

UPDATE -

Often over 90% of sodium arsenate can be removed by

• filtration
• coagulation
• ion exchange
• all of the above - ANSWER✔✔coagulation

Reduction of the level of fluorides in drinking water can be accomplished by

• coagulation
• lime softening
• ion exchange
• 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?

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• sodium sulfate
• sodium thiosulfate
• sodium bisulfate
• sodium bisulfite - ANSWER✔✔sodium thiosulfate

Methylene blue active substance (MBAS) is a test to identify

• hardness of water
• iron in water
• presence of detergents containing phosphates
• presence of coliform in bacteria - ANSWER✔✔presence of detergents containing phosphates

Which organism is not known as an iron bacterium?

• crenothrix
• giardia lamblia
• ferric chloride
• leptothrix - ANSWER✔✔giardia lamblia

The final product in biochemical oxidation of ammonia yields;

• nitride
• nitrite 2 / 4

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• nitrate
• nitrogen - ANSWER✔✔nitrate

Which contaminant in water is associated with methemoglobinemia?

• zinc
• lead
• copper
• nitrate - ANSWER✔✔nitrate

The substance constantly used as a coagulant in water treatment is:

• aluminum sulfate
• calcium sulfate
• potassium chloride
• sodium phosphate - ANSWER✔✔aluminum sulfate

The disinfecting ability of chlorine is affected most by:

• BOD
• temperature
• hydrogen ion concentration
• dissolved oxygen - ANSWER✔✔hydrogen ion concentration 3 / 4

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Alkalinity exists in three forms, which is not one of these forms?

• bicarbonate
• hydroxide
• carbonate
• hypochlorite - ANSWER✔✔hypochlorite

Which of the following would not contribute to water hardness?

• calcium sulfate
• magnesium sulfate
• calcium chloride
• sodium chloride - ANSWER✔✔sodium chloride

Improperly located wells, allowing fecal pollution of the water supply may lead to outbreaks of:

• botulism, leptospirosis, typhus fever, maria
• brucellosis, strep infections, chlorea, yellow fever
• salmonellosis, shigellosis, chlorea, hepatitis
• relapsing fever, histoplasmosis, psittacosis - ANSWER✔✔salmonellosis, shigellosis, chlorea,

hepatitis

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