Water Pollution Quiz

Which of the following incorrectly pairs a river area with a point source pollution condition?

• Clean zone-high levels of dissolved oxygen

• Point of input-rapid increase of biological oxygen demand

• Decomposition zone-only pollution tolerant fished found

• septic zone-most fish absent, low levels of dissolved oxygen

• recovery zone-normal levels of dissolved oxygen

Which of the following water pollutant is incorrectly paired with its source?

• oxygen demanding wastes-sewage

• organic chemicals-industry and farms

• sediments-unlined landfills

• heavy merls-mining refuse

• thermal-electric power plants

Which of the following is an example of a point source water pollutant?

• ballast water discharge from a ship offshore

• runoff from parking lots

• organic waste from cow feed lots

• sediments from land erosion

• nutrients from golf courses and lawns

how is cholera primarily transmitted?

• inhaling bacteria expelled into the air by someone coughing

• being bitten by an infected mosquito

• ingesting water water contaminated by human waste material from a person who already has the disease

• coming in contact with skin pustules present on a person who already has the disease

• ingesting water contaminated by leaking underground gasoline tanks

which of the following best describes eutrophication?

• the downward motion of water through soil, dissolving minerals along the way

• the increase of a chemical such as DDT in the bodies of animals at higher trophic levels

• a process of nature that helps support life, such as rivers purifying the water

• the natural aging process of a shallow lake or slow-moving stream as nutrients enrich the water

• the collection of sediment behind a dam caused by the slowing of the river water

which law sets standards for key water pollutants and requires polluters to get permits limiting what they can discharge into aquatic systems

• national environmental policy act (NEPA) 1969

• water pollution control act of 1972

• clean water act 1977

• coastal zone management act 1980

• water quality act 1987

What is the first step in the water treatment process?

• coagulation

• filtration and removal of debris, sand, grit, etc.

• flocs

• concentation

• chemical additives

Which substance is used in a sewage treatment system to kill harmful bacteria?

• ammonia

• chlorine

• sand

• soap

• flourine

What is the role of bacteria in the water purification process?

• digested organic matter
• add chlorine
• nothing, we don't want them in there
• add nutrients to the sludge

What gas must be maintained at precise levels in the aeration tank?

• CO₂
• O₂
• H₂
• CO