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Water (1)

Quiz by Aji Budiyanto

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10 questions
Show answers
  • Q1
    Potable water must be sterilized before it can be drunk. Which of the following is not a common treatment agent in the production of potable water?
    UV
    Chlorine
    Ozone
    Calcium carbonate
    30s
  • Q2
    Which of the following is not a source of fresh water?
    aqufiers
    lake
    oceans
    river
    30s
  • Q3
    When preparing potable water from freshwater sources, the water is first passed through a coarse screen. What is the purpose of this screen?
    To catalyze the breakdown of contaminants
    To help oxygen dissolve in the water
    To neutralize acid in the water
    To removed large objects from the water
    30s
  • Q4
    Which of the following is not a reason why there are more steps in the process of producing potable water from wastewater than from fresh water?
    Wastewater must be treated with stronger detergents and chemicals.
    Wastewater contains more toxic chemicals.
    Wastewater contains a lot of dissolved salts and minerals.
    Wastewater contains greater amounts of harmful bacteria.
    30s
  • Q5
    What usage of water requires the water to be treated by chlorination?
    Water for industrial cooling
    Water for drinking
    Water for farming
    Water for electricity generation in power plants
    30s
  • Q6
    What is the primary goal of the desalination process when producing potable water from saltwater?
    Removing salts and minerals from the saltwater
    Removing fine particles held in suspension in the saltwater
    Removing hydrogen ions and neutralizing the saltwater
    Killing bacteria in the saltwater
    30s
  • Q7
    Why are laboratory solutions usually prepared using pure water instead of tap water?
    Tap water may contain small particles of dirt.
    Pure water is slightly acidic, which helps in dissolving ionic compounds.
    Tap water contains dissolved impurities that may affect chemical reactions.
    Pure water is cheaper than tap water.
    30s
  • Q8
    Which of the following statements does not explain why distillation is a poor method for producing drinking water from seawater in large quantities?
    Large scale distillation equipment is expensive.
    Distillation takes a long time
    The large quantities of energy needed are expensive
    Large volumes of seawater must be run through the distillation equipment.
    30s
  • Q9
    Why is chlorination an essential treatment in the production of potable water?
    Chlorination ensures the water has a neutral pH.
    Chlorination kills the bacteria in the water.
    Chlorination removes some types of potassium-based fertilizers.
    Chlorination removes small particles of dirt.
    30s
  • Q10
    When river water is purified, small amounts of fertilizers are often still present in the water after purification. Which of the following statements explains why this is the case?
    Fertilizers build up in the pipes at water treatment plants and contaminate the treated water.
    Fertilizers are used at water treatment plants to kill the bacteria in the water.
    Very large quantities of fertilizers exist in the untreated river water and it is difficult to remove them all.
    The steps in the purification process do not remove soluble substances.
    30s

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