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REHS Exam Ch.1- Water Questions and Complete Solutions Graded A+
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REHS Exam Ch.1- Water Questions and Complete Solutions Graded A+
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REHS Exam Ch.1-Water Questions
and Complete
Solutions Graded
A+
Denning [Date] [Course title]
,Which of the following soil conditions is the most favorable for removal of viruses? - Answer: Fine
loamy sand over course sand & gravel
Which of the following organisms are most resistant to unfavorable env. conditions & indicates past or
possibly intermittent pollution? - Answer: Clostridium sporulates
Which of the following wells is considered the most dependable source of water & is less likely to
become contaminated? - Answer: Drilled wells
Which of the following is NOT considered a satisfactory solution to the problem of chem. contamination
in well systems? - Answer: Boiling the water
Which of the following chems is the most widely used to destory microorgs? - Answer: Chlorine
Which of the following is the best of backflow control? - Answer: Air gap
Microscopic photosyn. plants of the simplest forms, having neither roots, stems no leaves, that are
associated with taste & odor, filter clogging and other water problems are known as: - Answer: Algae
Control of infectious, intestinal diseases of humans requires: - Answer: Provisions of safe water
supplies, proper waste disposal & personal hygeine
Drinking water standards generally specify that a water is safe provided that testing in a speicifed
manner does no reveal more than an avg of: - Answer: 1 (+) sample out of 40 taken
What does it mean when a body of water has a high JTU? - Answer: it has high turbidity
The presence of which of the following is the most easily id by lab analysis in water contaminated by
feces? - Answer: coliform
Nephelometric Turbidity Unit (NTU) are most commonly used to - Answer: determine turbidity
, The safe distance between a well and waste disposal system is dependent on - Answer: chem, phyiscal
and bio processes
What is the first step in eval the safety of a potential water system? - Answer: a detailed sanitary survey
of the water supply
What are examples of groundwater systems? - Answer: dug, bored, driven, drill wells, rock, sand or
earth springs, infiltration galleries
What are the causes of hardness? - Answer: dissolved calcium * mag bicarbs, sulfates and chlorides
What is desalination? - Answer: The conversion of seawater or brackish water to fresh water.
The quality of surface water depends on - Answer: the watershed area drained, land use, location &
source of pollution& the natural agencies of purification
Which of the following is NOT commonly used for disinfection of water? - Answer: silver nitrate
Hydro pneumatic or pressure-tank water systems are suitable for: - Answer: small comm., housing dev,
private homes, and estates, camps, food service ops and hotels
The hydro pneumatic tank typically contains ________ of its volume as water. - Answer: 20%
Water containing nitrates generally indicates - Answer: evidence of pollution
Diatomaceous earth filters - Answer: should be augmented by chlorination
Hydrogen sulfide can be fatal at exposures of - Answer: 300ppm
The most practical method for removing nitrates from water is - Answer: ion exchange
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