Junior Secondary · Science

Further treatment of drinking water: Practice Questions

5 multiple-choice questions marked as you go, and 4 written questions with worked solutions. All on Further treatment of drinking water.

9 questions22 marksFree, no account

Question 1

1 mark

Which of the following further treatment methods uses ultraviolet (UV) light to make water safe for consumption?

Question 2

1 mark

Which of the following describes the correct position of further treatment in the overall process of making water safe for drinking?

Question 3

1 mark

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?

Question 4

1 mark

In the further treatment of drinking water, which of the following lists contains three methods specifically used to kill microorganisms?

Question 5

1 mark

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?

Question 6

3 marks

During the further treatment of drinking water, why is fluoride sometimes added, and what is its intended benefit?

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Question 7

5 marks

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.

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Question 8

3 marks

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.

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Question 9

6 marks

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.

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