Question detail
Which of the following is a method used to sterilise potable water?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Using the Earth's resources and obtaining potable water
Question
- A. Chlorine
- B. Sodium
- C. Calcium
- D. Iron
Answer
The correct option is Chlorine. This answer is correct because it matches the approved learning objective to recall chlorine, ozone and ultraviolet light as sterilising methods for potable water in the subtopic Potable water.
Explanation
The correct option is Chlorine. Chlorine is correct because it directly supports the approved learning objective to recall chlorine, ozone and ultraviolet light as sterilising methods for potable water. This belongs to the subtopic Potable water within Using the Earth's resources and obtaining potable water, so the explanation must stay tied to that curriculum context. The other options are incorrect because they either do not answer this learning objective, use a vague statement, or move away from Potable water.
Common mistake
Confusing Sterilisation Methods
Students often confuse the sterilising methods for potable water, thinking that chlorine and ozone serve the same purpose as ultraviolet light.
Remember that chlorine and ozone are chemical methods that disinfect water, while ultraviolet light is a physical method that kills microbes without adding chemicals.
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