問 1
1 点Which of the following further treatment methods uses ultraviolet (UV) light to make water safe for consumption?
Junior Secondary · Science
Further treatment of drinking water：練習問題
その場で採点される選択問題 5 問と、解説つきの記述問題 4 問。すべて「Further treatment of drinking water」からの出題です。
9 問22 点無料・登録不要
問 2
1 点Which of the following describes the correct position of further treatment in the overall process of making water safe for drinking?
問 3
1 点Ozone (\(O_3\)) is a powerful disinfectant used in further treatment, but it must be generated on-site at the treatment plant. Which statement best explains why?
問 4
1 点In the further treatment of drinking water, which of the following lists contains three methods specifically used to kill microorganisms?
問 5
1 点Even after water has undergone sedimentation and filtration at a treatment plant, why is it still essential to carry out 'further treatment' using agents like ozone or ultraviolet light?
問 6
3 点During the further treatment of drinking water, why is fluoride sometimes added, and what is its intended benefit?
まず自分で答えを書いてから、解説と照らし合わせましょう。
問 7
5 点Even if water appears clear after sedimentation and filtration, it must undergo further treatment. Explain why disinfection methods, such as the use of ozone or ultraviolet light, are biologically necessary before the water is considered potable.
まず自分で答えを書いてから、解説と照らし合わせましょう。
問 8
3 点Drinking water undergoes several treatment steps to ensure it is safe for human consumption.
a) Name two common methods used to kill harmful microorganisms present in drinking water.
b) Explain the primary reason why fluoride is sometimes added to drinking water.
まず自分で答えを書いてから、解説と照らし合わせましょう。
問 9
6 点A remote village relies on a nearby river as its primary source of drinking water. Analyses show the river water contains visible suspended impurities like silt, microscopic bacteria, and some dissolved mineral salts. The village plans to build a simple water treatment system.
(a) Outline two essential physical purification processes that should be included in the initial stages of the treatment system to remove the visible suspended impurities. For each process, state its primary function.
(b) After these physical processes, the water may still contain harmful bacteria. Explain why further treatment is necessary even if the water looks clear, and name one specific method used to kill these microorganisms.
(c) If this purified water were to be used for a highly sensitive industrial application requiring extremely pure water (e.g., laboratory experiments needing deionised water), explain why the current treatment would likely be insufficient and suggest an additional process that would be required.
まず自分で答えを書いてから、解説と照らし合わせましょう。
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