Question detail
During the sedimentation process, what happens to the sewage sludge?
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. It is filtered out and discarded
- B. It floats on the surface of the effluent
- C. It settles at the bottom of the tank
- D. It is treated with chemicals
Answer
The correct option is It settles at the bottom of the tank. This answer is correct because it matches the approved learning objective to explain how sedimentation separates sewage sludge from effluent in the subtopic Waste water treatment.
Explanation
The correct option is It settles at the bottom of the tank. It settles at the bottom of the tank is correct because it directly supports the approved learning objective to explain how sedimentation separates sewage sludge from effluent. This belongs to the subtopic Waste water treatment 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 Waste water treatment.
Common mistake
Confusing Sedimentation with Filtration
Students often confuse sedimentation with filtration, thinking both processes remove solids from liquids in the same way.
Sedimentation relies on gravity to separate solids from liquids based on density, while filtration uses a barrier to physically separate solids from liquids.
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