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Unit 3 Water Use

True/False
Indicate whether the statement is true or false.
 

 1. 

A water manager's goal is to balance flood control and fish populations.
 

 2. 

The life of the reservoirs or dams will greatly increase if silt resulting from soil erosion can to pour into the basin.
 

 3. 

The most common water-transported items are petroleum and coal products.
 

 4. 

Ocean water is not useful in its present state because of its high salt content.
 

 5. 

The process of salt extraction is called saltation.
 

 6. 

Over 97 percent of the world’s water has salinity that exceeds safe drinking standards.
 

 7. 

The process of desalinization has become critical in supplying many parts of the world with freshwater.
 

 8. 

The average person uses 50–75 gallons of water daily.
 

 9. 

The problem with water is that in so many cases, the water is not where the people are.
 

 10. 

The main problem facing experts in recycling is the removal of odor, tastes, and salts from the water.
 

Multiple Choice
Identify the choice that best completes the statement or answers the question.
 

 1. 

The power to move goods on water is ____ than that required to move them on land.
A.
more
B.
less
 

 2. 

The World Health Organization specifies that total dissolved solids (TDS) not exceed ____ milligrams per liter.
A.
550
B.
1,000
 

 3. 

Seawater averages ____ mg/l in TDS.
A.
13,000
B.
35,000
 

 4. 

Which of the following is not one of the main goals of the Office of Saline Water (OSW)?
A.
to provide desalination technology to supply immediate water to areas where water is in short supply
B.
to develop hardware for desalination processes
C.
to develop new processes of desalination
D.
to organize components of a desalination policy into a law
 

 5. 

Which of the following is not a method of salt removal?
A.
membrane
D.
mycorrhiza
B.
humidification
E.
freezing action
C.
distillation desalination
 

 6. 

Which of the following is not one of the main methods of membrane desalination?
A.
reverse osmosis
C.
contact
B.
electrodialysis
D.
none of these
 

 7. 

____ uses the natural principle of liquids flowing through a semipermeable membrane.
A.
Electrodialysis
B.
Reverse osmosis
 

 8. 

When subjected to an electric current, sodium and chlorine separate and pass through different filters in the ____ process.
A.
reverse osmosis
B.
electrodialysis
 

 9. 

The ____ distillation process involves placing the water under pressure when turned into steam.
A.
long-tube
C.
flash
B.
vapor-compression
D.
all of these
 

 10. 

____ uses the fact that water boils at a lower temperature when it is at a lower pressure.
A.
Vapor compression
C.
Long-tube distillation
B.
Flash distillation
D.
Level group
 

Matching
 
 
Match the question with the correct response
A.
flash distillation
F.
reduce flood hazard
B.
reverse osmosis
G.
membrane process
C.
silver nitrate crystals
H.
distillation
D.
laundry
I.
flush toilets
E.
drinking
J.
oceans
 

 1. 

One of the three main distillation processes
 

 2. 

One of the basic uses of dams, reservoirs, and ponds
 

 3. 

The largest bodies of water
 

 4. 

Used mainly on inland brackish water where the salt content is lower
 

 5. 

Applies pressure to the salt water to make it flow from a salt solution to a fresh solution
 

 6. 

Works when water is heated, evaporates, and leaves behind any solid impurities
 

 7. 

Forty percent of household water use
 

 8. 

The most common and oldest chemical used for making rain
 

 9. 

Twenty percent of household water use
 

 10. 

Five percent of household water use
 



 
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