Water

Question 1

The dramatic temperature changes on the moon between day and night are not seen on the earth because of what property of water?

Answer 1

high heat capacity

Question 2

In secondary treatment of sewage, which removes organic matter?

Answer 2

aerobic bacteria

Question 3

The saltiness of the oceans is

Answer 3

constant

Question 4

Charcoal filtration of wastewater is an excellent method for the removal of

Answer 4

organic molecules

Question 5

All of the following statements are true of hard water EXCEPT

Answer 5

A) charcoal filtration.
B) sand and gravel filtration.*
C) reverse osmosis.
D) phytoremediation.

Question 6

The majority of fresh water is found in

Answer 6

polar ice caps

Question 7

Primary sewage treatment involves

Answer 7

settling

Question 8

Biochemical oxygen demand (BOD). is a measure of the amount of

Answer 8

oxygen required to degrade organic material in the water.

Question 9

Water use is an important aspect of water conservation. For drinking purposes the average adult needs to consume about

Answer 9

1.5 L/day.

Question 10

Advanced treatment of wastewater can include any of the following EXCEPT

Answer 10

A) charcoal filtration.
B) sand and gravel filtration.*
C) reverse osmosis.
D) phytoremediation.

Question 11

One of the potential problems with chlorination of waste water is that it

Answer 11

produces low levels of chlorinated hydrocarbons.

Question 12

Aerobic decomposition of organic matter requires

Answer 12

oxygen

Question 13

The most serious threat to human health from water supplies is

Answer 13

bacteria

Question 14

A major source of groundwater contamination is leaking underground storage tanks. Most of these tanks once held

Answer 14

gasoline

Question 15

Which of the following is NOT a property of water?

Answer 15

A) It has a high specific heat.
B) It has a higher density in the liquid state than in the solid state.
C) It has a lower density than most liquids do.*
D) It dissolves most ionic substances.

Question 16

One of the advantages of treating sewage effluent with ozone as opposed to chlorine is

Answer 16

O3 provides a residual protection against bacteria.
B) O3 is less expensive.
C) O3 is more effective in killing viruses.*
D) O3 is more effective in killing bacteria.

Question 17

Which part of the water supply is most isolated from the purifying capacity of the water cycle?

Answer 17

groundwater

Question 18

Approximately what fraction of the earth’s surface is covered with water?

Answer 18

75%

Question 19

A major contaminant in well water in many agricultural areas is

Answer 19

nitrates

Question 20

At any given time, what proportion of the world’s hospital beds are occupied by people with waterborne diseases?

Answer 20

50%

Question 21

The Clean Water Act has had no impact on water quality over the past two decades.

Answer 21

false

Question 22

Heat of vaporization is the amount of heat required to

Answer 22

evaporate a liquid

Question 23

Anaerobic degradation of organic material in water systems occurs in the absence of

Answer 23

dissolved oxygen

Question 24

Rainwater is

Answer 24

slightly acidic because it reacts with dissolved CO2 gas

Question 25

What percentage of water on the earth is seawater, and hence, unfit for drinking?

Answer 25

98%

Question 26

Which pollutant may cause methemoglobinemia (blue baby syndrome)?

Answer 26

nitrates

Question 27

The major use of water in the United States is for personal consumption.

Answer 27

false

Question 28

Bottled water is becoming an increasingly popular drink in the United States. Which of the following statements about bottled water is true?

Answer 28

The testing of bottled water is generally less rigorous than the testing of municipal water supplies

Question 29

Municipal water supplies are generally treated either with chlorine or with ozone. Which of the following statements is true?

Answer 29

Ozone kills both bacteria and viruses

Question 30

You can live for weeks without food, but only days without water

Answer 30

true

Question 31

Which of the following uses the greatest amount of water in the United States?

Answer 31

cooling for electric power plants

Question 32

Secondary treatment of sewage involves

Answer 32

filtering and aeration

Question 33

Ppm and ppb are

Answer 33

concentration units

Question 34

Aeration of drinking water

Answer 34

A) improves flavor.
B) increases dissolved air.
C) removes odors.
D) does all of the above.*

Question 35

Most of the water available on the earth’s surface is potable

Answer 35

false