Water Pollution and Energy Environment Quiz
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Questions and Answers

What is water pollution primarily caused by?

  • Climatic changes
  • Geological processes
  • Human activities (correct)
  • Natural changes in the composition of water

    • What is the definition of water pollution?

  • The loss of beneficial uses of water due to human activity (correct)
  • The preservation of natural environment
  • The conservation of water bodies
  • The removal of beneficial uses of water

    • What is the result of introducing contaminants into the natural environment in excess concentrations?

  • Environmental preservation
  • Water conservation
  • Water purification
  • Water pollution (correct)

    • What are the types of water bodies that can be affected by water pollution?

    <p>Lakes, rivers, aquifers, and ground water</p> Signup and view all the answers

    What is the outcome of water pollution?

    <p>Contamination of water bodies</p> Signup and view all the answers

    What is the characteristic of water that is related to the presence of microorganisms?

    <p>Biological</p> Signup and view all the answers

    What is the term for the measure of the amount of oxygen required by microorganisms to break down organic matter in water?

    <p>BOD</p> Signup and view all the answers

    What type of water pollution source is attributed to a clearly identifiable, specific physical location or a defined discharge channel?

    <p>Point source</p> Signup and view all the answers

    What is the term for the amount of organic matter present in water, measured by the amount of oxygen required to oxidize it?

    <p>COD</p> Signup and view all the answers

    What is the characteristic of water that is related to the presence of dissolved gases, such as oxygen and hydrogen sulfide?

    <p>Gases</p> Signup and view all the answers

    What is the range of dissolved oxygen levels in water where aquatic life is under stress?

    <p>Below 5 mg/l</p> Signup and view all the answers

    What does the term 'ThOD' stand for in the context of water quality?

    <p>Theoretical Oxygen Demand</p> Signup and view all the answers

    Which of the following is NOT a physio-chemical characteristic of water quality?

    <p>Gravity</p> Signup and view all the answers

    What is the term for the amount of oxygen required to break down organic matter in water?

    <p>Biochemical Oxygen Demand</p> Signup and view all the answers

    What is the purpose of sampling in water quality monitoring?

    <p>To collect representative water samples for analysis</p> Signup and view all the answers

    What is the range of dissolved oxygen levels in water that indicates moderate pollution?

    <p>4.5-6.7 mg/l</p> Signup and view all the answers

    What is Biochemical Oxygen Demand (BOD) a measure of?

    <p>The amount of oxygen required by microorganisms to break down organic matter</p> Signup and view all the answers

    Why is the BOD test carried out for 5 days?

    <p>Because most of the biochemical oxygen demanding substances are oxidized within 5 days</p> Signup and view all the answers

    What is the purpose of the bacterial seed in the BOD test?

    <p>To catalyze the oxidation of wastewater</p> Signup and view all the answers

    What is the indicator used in the titration process of the BOD test?

    <p>Starch</p> Signup and view all the answers

    What is the unit of the dilution factor in the BOD test?

    <p>No unit, it is a dimensionless quantity</p> Signup and view all the answers

    What is the temperature at which the BOD incubator is maintained?

    <p>20⁰ C</p> Signup and view all the answers

    What is the characteristic of an anaerobic fluidized bed process that distinguishes it from other reactors?

    <p>The anaerobic microbes grow on the surface of the medium, expanding the apparent volume</p> Signup and view all the answers

    What is the primary objective of disinfection?

    <p>Partial destruction of disease-causing organisms</p> Signup and view all the answers

    Which of the following is NOT a characteristic of an ideal disinfectant?

    <p>Low cost</p> Signup and view all the answers

    What is the term used to describe a reactor that combines the benefits of suspended growth and attached growth processes?

    <p>Expanded bed reactor</p> Signup and view all the answers

    Which of the following is an example of a physical disinfection method?

    <p>Heating</p> Signup and view all the answers

    What is the purpose of a biofilter in disinfection?

    <p>To remove extraneous materials</p> Signup and view all the answers

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