Water Quality Analysis
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Questions and Answers

What physical characteristics of water are typically analyzed for quality testing?

  • Turbidity, Colour, Taste, and Odour (correct)
  • Temperature, Acidity, Iron, and Nitrates
  • Hardness, Chlorides, Sulphates, and Solids
  • Density, Viscosity, pH, and Alkalinity

    • Which group of bacteria serves as an indicator of water contamination with sewage?

  • E.Coli
  • Pathogenic Bacteria
  • Iron Bacteria
  • Coliform Group (correct)

    • What is the primary reason for examining water for pathogenic bacteria?

  • To identify the colour variations
  • To determine the acidity and alkalinity
  • To prevent waterborne diseases (correct)
  • To assess the taste and odour

    • Which of the following is NOT a chemical characteristic tested in water quality analysis?

    <p>Taste (D)</p> Signup and view all the answers

    Why is minimizing the number of coliforms important in water quality testing?

    <p>To reduce harmful species and pathogens (D)</p> Signup and view all the answers

    What is the theoretical average time for which water is detained in a settling tank called?

    <p>Detention period (C)</p> Signup and view all the answers

    Which type of settling involves particles increasing in mass due to flocculation?

    <p>Type II: Flocculent particles (B)</p> Signup and view all the answers

    Which force causes particles suspended in water to accelerate in the direction of the force if the density differs from that of water?

    <p>Buoyant force (B)</p> Signup and view all the answers

    What happens to the drag force as velocity increases for particles settling in water?

    <p>Increases as the square of the velocity (B)</p> Signup and view all the answers

    What is the formula for the drag force exerted on a spherical particle during settling?

    <p>$F_d = CDApv^2/2$ (D)</p> Signup and view all the answers

    In which flow regime does the drag coefficient value equal 24 for spherical particles?

    <p>Laminar flow (B)</p> Signup and view all the answers

    What is the purpose of aeration in water treatment?

    <p>To remove suspended matter (B)</p> Signup and view all the answers

    Which source of water requires complete treatment according to the text?

    <p>Impounded reservoirs with considerable pollution (C)</p> Signup and view all the answers

    What is the function of sedimentation in water treatment?

    <p>To remove coarse dispersed phase (B)</p> Signup and view all the answers

    Which parameter does the Indian Standards for drinking water specify the highest limit for?

    <p>Nitrates (NO3) (C)</p> Signup and view all the answers

    What is the typical function of filtration in water treatment?

    <p>To eliminate colloidal and dissolved matter (D)</p> Signup and view all the answers

    Which type of aerator allows water to fall by gravity to expose it to the atmosphere?

    <p>Gravity aerators (C)</p> Signup and view all the answers

    What is the primary function of settling in water treatment?

    <p>To remove flocculated impurities (D)</p> Signup and view all the answers

    What is the desirable range for turbidity in terms of NTU units according to Indian Standards for drinking water?

    <p>&lt; 10 (D)</p> Signup and view all the answers

    What is the primary purpose of aerators in water treatment?

    <p>To remove odor and tastes from water (B)</p> Signup and view all the answers

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