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BESC 320 Mid-term Questions & Answers
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BESC 320 Mid-term Questions & Answers
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BESC 320 Mid-term Questions &Answers
Drinking water are tested for the following, based on Safe drinking water act Correct Ans-
Disinfection byproducts, E. coli, and lead
The changes in the source water quality can impact the drinking water treatment process.
Correct Ans-True
In a household, which of the following can be used to reduce human lead exposure (potentially
leaking from the house plumbing) Correct Ans-Point of use installation of a filter certified to
remove lead and drinking bottled water
What water/products are regulated by FDA? Correct Ans-bottled water, flavored and
nutrient-adding water
What is the percentage of freshwater in the total global water? Correct Ans-2.5%
In the evapotranspiration process, what is the estimated percentage goes into recharging the
groundwater? Correct Ans-1/6 (16%)
What is the common test to screen radioactivity in water? Correct Ans-gross alpha test
Four factors that impact bacteria survival/die off in water Correct Ans-temperature, pH,
drying, and UV radiation
What are the 5 components in the water cycle? Correct Ans-Precipitation, condensation,
runoff, infiltration, evapotranspiration
, What are the parameters that are commonly used for natural water monitoring? Correct
Ans-Dissolved oxygen, planktons, turbidity, fish species
Why is water pH important for aquatic life? Correct Ans-It determines substances' solubility,
it determines the bioavailability of nutrients, it determines the bioavailability of essential metals
and toxic metals
What is the concentration threshold of dissolved oxygen that is stressful for aquatic life?
Correct Ans-lower than 3 mg/mL
How to measure water turbidity? Correct Ans-Measure the light scattering effect based on
the suspended particles in water
Which is the following has the highest electrical conductivity? Correct Ans-0.5 mole/L KCL
electrolyte solution
When planning for water sampling in streams, one should consider Correct Ans-Design
sample labels to record location, data, and other relevant sample information, AND sample
main current
Which of the following can increase electrical conductivity of natural water? Correct Ans-
Wastewater discharge, agricultural runoff, urban runoff, flooding, and events like heavy rain and
snowmelt
To perform a water quality evaluation project of natural water, we shall Correct Ans-Establish
the baseline characteristics, establish a spatial and temporal sampling plan, establish a data
management plan to set comparison thresholds, and determine what are the critical
parameters to measure
Waters of the US includes Correct Ans-Beach water of the Pacific Ocean off of California,
Mississippi River, hoover dam reservoir
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