Lesson 4.10.1.3

4.10.1.3 Waste water treatment Quiz: AQA Chemistry, Unit 10

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 4.10.1.3, Waste water treatment: 20 multiple choice questions for the AQA GCSE Chemistry (8462), Unit 10: Using resources, written with Revision Ninja.

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The 20 questions

  1. What is the very first stage in the treatment of sewage waste water?

    • Screening and grit removal
    • Anaerobic digestion
    • Aerobic biological treatment
    • Sedimentation

  2. What are the two main products formed during waste water sedimentation?

    • Sewage sludge and effluent
    • Grit and biomass
    • Effluent and sediment
    • Potable water and sludge

  3. How is sewage sludge treated?

    • Electrolysis
    • Anaerobic digestion
    • Reverse osmosis
    • Distillation

  4. How is effluent treated in sewage treatment?

    • Anaerobic digestion
    • Aerobic biological treatment
    • Bioleaching
    • Phytomining

  5. What must be removed from sewage and agricultural waste water?

    • Plastics and grit
    • Heavy metals and salts
    • Organic matter and microbes
    • Sulfur and carbon

  6. What two key components may industrial waste water require the removal of?

    • Organic matter and chemicals
    • Salt and sand
    • Sludge and effluent
    • Microbes and grit

  7. Which stage removes large solid objects first?

    • Screening
    • Anaerobic digestion
    • Aerobic treatment
    • Sedimentation

  8. What is the correct chronological sequence of sewage treatment stages?

    • Sedimentation, screening, aeration, digestion
    • Digestion, aeration, screening, sedimentation
    • Screening, sedimentation, digestion, aeration
    • Aeration, digestion, sedimentation, screening

  9. A sewage works wants to produce biogas from sludge. Which process is used?

    • Electroplating
    • Anaerobic digestion
    • Galvanising
    • Phytomining

  10. Which is easiest to turn into potable water?

    • Sea water
    • Ground water
    • Salt water
    • Untreated waste water

  11. Why is obtaining potable water from salt water harder than from ground water?

    • Contains harmful microbes
    • Has high organic content
    • Requires high energy desalination
    • Requires heavy filtration

  12. Why must large volumes of waste water undergo extensive treatment?

    • To extract rare metals
    • To generate electricity
    • To produce solid fuel
    • Before release to environment

  13. Which stage leaves a liquid effluent for further treatment?

    • Anaerobic digestion
    • Sedimentation
    • Screening
    • Grit removal

  14. Which treatment does not need oxygen?

    • Aeration
    • Aerobic treatment
    • Anaerobic digestion
    • Oxidation

  15. What substances must typically be removed from industrial effluent?

    • Chemicals and organic matter
    • Grit and sand
    • Microbes and salt
    • Potable water and sludge

  16. Which two primary sectors produce large amounts of waste water?

    • Agriculture and forestry
    • Urban life and industry
    • Energy and fishing
    • Mining and transport

  17. What process allows solids to settle out during sewage treatment?

    • Aerobic digestion
    • Chlorination
    • Screening
    • Sedimentation

  18. A works uses screening, sedimentation, digestion and aerobic treatment. What does digestion treat?

    • Effluent only
    • Potable water
    • Sewage sludge
    • Grit

  19. What is the primary aim of waste water treatment before release?

    • Increase pH
    • Cool water
    • Remove pollutants
    • Add nutrients

  20. Which source of waste water can contain both organic matter and harmful chemicals?

    • Industrial waste water
    • Fresh lake water
    • Rainwater
    • Spring water

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