Water Microbiology Quiz
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Questions and Answers

What type of bacteria are known to produce a blue-green pigment and a fluorescent pigment?

  • Staphylococcus aureus
  • Pseudomonas aeruginosa (correct)
  • Escherichia coli
  • Bacillus subtilis

    • Why is it important to eliminate endospores of bacteria in water treatment?

  • Because they are only found in swimming pools
  • Because they are especially resistant to disinfecting agents (correct)
  • Because they are harmless to humans
  • Because they are easy to kill

    • What is the primary reason for detecting Pseudomonas aeruginosa in water?

  • To measure the effectiveness of disinfection
  • To monitor water quality (correct)
  • To identify the source of infection
  • To determine the presence of other bacteria

    • Why is Staphylococcus aureus being considered as an indicator of sanitary quality of recreational waters?

    <p>Because its presence is associated with human activity</p> Signup and view all the answers

    What type of algae are widely present in freshwater environments?

    <p>All types of algae</p> Signup and view all the answers

    What is the main purpose of microbiological analysis in water treatment?

    <p>To monitor water quality</p> Signup and view all the answers

    What is the primary factor influencing algal growth in freshwater environments?

    <p>Multiple physical factors</p> Signup and view all the answers

    What type of bacteria are commonly found in surface waters and soil?

    <p>Pseudomonas aeruginosa</p> Signup and view all the answers

    What is the primary advantage of combining chlorination with filtration in drinking water supply?

    <p>Providing excellent disinfection and removal of pathogens</p> Signup and view all the answers

    What is the main factor that affects the contact time required for chlorine to disinfect microorganisms?

    <p>All of the above</p> Signup and view all the answers

    What is the primary role of chlorine in controlling biological growth in water supplies?

    <p>Eliminating algae, bacteria, and mold growth</p> Signup and view all the answers

    What is the primary advantage of using chlorine dioxide over chlorine in water disinfection?

    <p>All of the above</p> Signup and view all the answers

    What is the primary role of hypochlorous acid in water disinfection?

    <p>Acting as a stronger disinfectant and oxidant</p> Signup and view all the answers

    What determines the ratio of hypochlorous acid to hypochlorite ion in water?

    <p>pH level of the water</p> Signup and view all the answers

    What is the primary role of chlorine in controlling taste and odor in water?

    <p>All of the above</p> Signup and view all the answers

    What is the primary benefit of using chlorine as a disinfectant in water treatment?

    <p>Producing a potent germicide</p> Signup and view all the answers

    What is the result of mineralization in water?

    <p>Formation of simple compounds</p> Signup and view all the answers

    What is the biochemical oxygen demand (BOD) a measure of?

    <p>Amount of oxygen used by microorganisms</p> Signup and view all the answers

    What is the effect of discharging impurities into a water reservoir?

    <p>Sudden change in chemical, biological, and physical conditions</p> Signup and view all the answers

    What type of bacteria are Salmonella and Shigella?

    <p>Obligate pathogenic bacteria</p> Signup and view all the answers

    What is the role of self-purification in water?

    <p>Formation of zones with decreasing pollution levels</p> Signup and view all the answers

    What type of bacteria are typically found in the digestive tract of humans and animals?

    <p>Facultatively pathogenic bacteria</p> Signup and view all the answers

    What is the consequence of bacterial dysentery caused by Shigella?

    <p>Infections of the digestive tract</p> Signup and view all the answers

    What is the habitat of opportunistic microorganisms?

    <p>Human or animal digestive tracts</p> Signup and view all the answers

    What is the likely biochemical effect of UV radiation on microorganisms?

    <p>Change in the biochemical structure of nucleic acids</p> Signup and view all the answers

    What is the optimal wavelength range for UV disinfection?

    <p>240-280 nm</p> Signup and view all the answers

    What is the purpose of an activated carbon filter in a UV radiation system?

    <p>To remove metals and particulates</p> Signup and view all the answers

    Why is UV radiation an effective disinfectant?

    <p>It causes an intracellular photochemical reaction</p> Signup and view all the answers

    What is the primary limitation of using UV radiation for water disinfection?

    <p>It has no residual kill</p> Signup and view all the answers

    What is the recommended concentration of chlorine for water disinfection in Kurdistan?

    <p>0.7 ppm</p> Signup and view all the answers

    What is the primary mechanism of sedimentation in water treatment?

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

    What is a significant limitation of distillation as a water treatment method?

    <p>It is expensive to boil and cool water</p> Signup and view all the answers

    Which of the following is the correct definition of potable water?

    <p>Water that is free of all objectionable materials including pathogens, colors, and toxins.</p> Signup and view all the answers

    What is the main focus of water microbiology?

    <p>Study of microorganisms in potable water.</p> Signup and view all the answers

    What is NOT a requirement for water to be considered potable?

    <p>Presence of low concentrations of dissolved salts.</p> Signup and view all the answers

    Which of the following environments is associated with aquatic microbiology rather than water microbiology?

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

    Why is water treated and disinfected?

    <p>To remove chemicals and pathogens</p> Signup and view all the answers

    Which of these microorganisms are commonly studied in microbiology?

    <p>Fungi and bacteria</p> Signup and view all the answers

    What is the primary concern regarding raw water when it comes to human health?

    <p>Many contaminants derived from sewage and industries</p> Signup and view all the answers

    Which factors have led to the improvement in water purification?

    <p>Recurrence of waterborne illness</p> Signup and view all the answers

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