1. The temperature versus D.O. relationship for wastewater is such _.
a. higher the temperature, the higher the D.O. saturation level.
b. higher the temperature, the lower the D.O. saturation level
c. lower the temperature, the lower the D.O. saturation level
d. none of the above

2. The gas most commonly associated with fresh wastewater is _.
a. carbon dioxide
b. carbon monoxide
c. hydrogen sulfide
d. oxygen

3. Sources of harmful radioactive isotopes in wastewater collection systems include _.
a. hospitals
b. research labs
c. tracer studies
d. all the above

4. Hz stands for _.
a. cycles per second
b. hand control
c. horizontal phase
d. polyphase

5. When a fire hydrant is operated, it should be _.
a. just opened enough to have a flow
b. opened fully
c. opened halfway
d. regulated to flow required

Answers:

1. b

2. d

3. d

4. a

5. b