28 Questions
What is water pollution primarily caused by?
Human activities
What is the definition of water pollution?
The loss of beneficial uses of water due to human activity
What is the result of introducing contaminants into the natural environment in excess concentrations?
Water pollution
What are the types of water bodies that can be affected by water pollution?
Lakes, rivers, aquifers, and ground water
What is the outcome of water pollution?
Contamination of water bodies
What is the characteristic of water that is related to the presence of microorganisms?
Biological
What is the term for the measure of the amount of oxygen required by microorganisms to break down organic matter in water?
BOD
What type of water pollution source is attributed to a clearly identifiable, specific physical location or a defined discharge channel?
Point source
What is the term for the amount of organic matter present in water, measured by the amount of oxygen required to oxidize it?
COD
What is the characteristic of water that is related to the presence of dissolved gases, such as oxygen and hydrogen sulfide?
Gases
What is the range of dissolved oxygen levels in water where aquatic life is under stress?
Below 5 mg/l
What does the term 'ThOD' stand for in the context of water quality?
Theoretical Oxygen Demand
Which of the following is NOT a physio-chemical characteristic of water quality?
Gravity
What is the term for the amount of oxygen required to break down organic matter in water?
Biochemical Oxygen Demand
What is the purpose of sampling in water quality monitoring?
To collect representative water samples for analysis
What is the range of dissolved oxygen levels in water that indicates moderate pollution?
4.5-6.7 mg/l
What is Biochemical Oxygen Demand (BOD) a measure of?
The amount of oxygen required by microorganisms to break down organic matter
Why is the BOD test carried out for 5 days?
Because most of the biochemical oxygen demanding substances are oxidized within 5 days
What is the purpose of the bacterial seed in the BOD test?
To catalyze the oxidation of wastewater
What is the indicator used in the titration process of the BOD test?
Starch
What is the unit of the dilution factor in the BOD test?
No unit, it is a dimensionless quantity
What is the temperature at which the BOD incubator is maintained?
20⁰ C
What is the characteristic of an anaerobic fluidized bed process that distinguishes it from other reactors?
The anaerobic microbes grow on the surface of the medium, expanding the apparent volume
What is the primary objective of disinfection?
Partial destruction of disease-causing organisms
Which of the following is NOT a characteristic of an ideal disinfectant?
Low cost
What is the term used to describe a reactor that combines the benefits of suspended growth and attached growth processes?
Expanded bed reactor
Which of the following is an example of a physical disinfection method?
Heating
What is the purpose of a biofilter in disinfection?
To remove extraneous materials
Test your knowledge on water pollution, its effects, and the importance of energy and environment conservation. This quiz covers the basics of water pollution, the water cycle, and the significance of energy and environment in our daily lives.
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