Source Water Flashcards
The organisms used to indicate the likelihood that pathogenic bacteria may be present are _________.
a. Salmonella bacteria.
b. enteric viruses.
c. coliform bacteria.
d. Pseudomonas group bacteria.
c. coliform bacteria.
Which adverse effects does the secondary contaminant manganese have?
a. Unappealing to drink, undesirable taste, and possible indication of corrosion.
b. Discolored laundry and changed taste of water, coffee, tea, and other beverages.
c. Undesirable metallic taste and possible indication of corrosion.
d. Added total dissolved solids and scale, indication of sewage contamination and tastes.
b. Discolored laundry and changed taste of water, coffee, tea, and other beverages.
In general, which causes an increase in taste and odors when natural waters lack dissolved oxygen?
a. Increase in algae growth
b. pH reduction causing an increase in iron and manganese going into solution.
c. Anaerobic decomposition
d. Oxidation of organic material
c. Anaerobic decomposition
A physical property, as opposed to a chemical property, important to water treatment is __________.
a. turbidity.
b. pH.
c. dissolved solids.
d. electrical conductivity.
a. turbidity.
Which are the two principal chemicals that cause water hardness?
a. Aluminum and iron
b. Aluminum and calcium
c. Iron and manganese
d. Calcium and magnesium
d. Calcium and magnesium
Temporary hardness is caused by __________.
a. magnesium sulfate.
b. calcium nitrate.
c. magnesium chloride.
d. calcium bicarbonate.
d. calcium bicarbonate.
Which type of algae would most likely be found in nutrient-rich waters?
a. Blue-green algae
b. Green algae
c. Diatoms
d. Brown algae
a. Blue-green algae
The quantity of dissolved oxygen in water is a function of __________.
a. pH, alkalinity, temperature, and total dissolved solids.
b. temperature and alkalinity.
c. pH and temperature.
d. temperature, pressure and salinity.
d. temperature, pressure and salinity.
Most of the carbon dioxide in groundwater originates from __________.
a. weathering of rocks.
b. biological oxidation of organic matter.
c. animal respiration.
d. plant respiration.
b. biological oxidation of organic matter.
At which temperature does the maximum density o water occur?
a. -0.4oC
b. 0.0oC
c. 0.4oC
d. 4.0oC
d. 4.0oC
When water freezes it expands by ________ of its original volume.
a. one-twentieth
b. one-fortieth
c. one-ninth
d. one-seventh
c. one-ninth
Which type o polar bonds are between the hydrogen atoms and the oxygen atom in water?
a. Ionic
b. Covalent
c. van der Waals
d. Hydrogen bonding
b. Covalent
Which would be the most probable solution to control algae in the source water if the algae were clogging the filters at the water plant?
a. Use activated carbon
b. Decrease oxygen levels
c. Backwash filters more frequently
d. Control nutrients
d. Control nutrients
Total dissolved minerals in rainwater are typically close to _________.
a. 0.05 mg/L
b. 1.00 mg/L
c. 10.00 mg/L
d. 40.00 mg/L
c. 10.00 mg/L
Because manganese is only slightly soluble, it is rarely found in surface waters above a concentration of _________.
a. 1.0 mg/L
b. 2.0 mg/L
c. 2.5 mg/L
d. 3.0 mg/L
a. 1.0 mg/L
