Lesson 5.10.1.3
5.10.1.3 Waste water treatment Quiz: AQA Combined Science, Unit 17
20 questions
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Lesson 5.10.1.3, Waste water treatment: 20 multiple choice questions for the AQA GCSE Combined Science (8464), Unit 17: Using resources, written with Revision Ninja.
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The 20 questions
-
What must be removed from sewage and agricultural waste water?
- Insoluble glass
- Dissolved gases
- Heavy metals
- Organic matter
-
Which initial sewage treatment step removes large solids first?
- Sedimentation
- Screening
- Chlorination
- Filtration
-
What two products are directly produced by sewage sedimentation?
- Solids and vapour
- Grit and salt
- Sludge and effluent
- Gas and water
-
What condition defines the anaerobic digestion of sewage sludge?
- Without oxygen
- Extreme heat
- High pressure
- With oxygen
-
Which process treats liquid effluent using microbes and air?
- Anaerobic digestion
- Sedimentation
- Screening
- Aerobic treatment
-
Which type of waste water specifically requires the removal of harmful chemicals?
- Agricultural
- Industrial
- Groundwater
- Rainwater
-
Which sewage treatment stage is correctly paired with its target?
- Aerobic treatment: grit
- Anaerobic digestion: sludge
- Sedimentation: chemicals
- Screening: effluent
-
Why must waste water undergo treatment before entering the environment?
- Lower temperature
- Increase volume
- Remove pollutants
- Add nutrients
-
Plastic items are found in incoming water at a sewage works. Which step handles these first?
- Screening
- Electrolysis
- Anaerobic digestion
- Aerobic treatment
-
After sedimentation, what process is next used to treat liquid effluent?
- Grit removal
- Anaerobic digestion
- Screening
- Aerobic biological treatment
-
Which source is most likely to need harmful chemicals removed?
- Rainwater from a garden
- Factory discharge
- Household bathroom water
- Household sewage
-
What primary method is used to remove grit during the initial sewage screening process?
- Electrolysis
- Sedimentation
- Distillation
- Filtration
-
Anaerobic digestion of sewage sludge also produces which gas?
- Argon
- Nitrogen
- Methane
- Oxygen
-
What is the main purpose of sedimentation in sewage treatment?
- Heating water
- Killing bacteria
- Separating sludge
- Adding chlorine
-
What is the correct sequence of the first two sewage treatment steps?
- Screen then sediment
- Sediment then screen
- Aerate then screen
- Digest then filter
-
Why is aerobic biological treatment effective in waste water plants?
- Filtration removes salts
- UV light kills viruses
- Chemicals precipitate metals
- Microbes digest matter
-
Which output of sedimentation is solid and needs further treatment?
- Effluent
- Treated water only
- Grit-free air
- Sewage sludge
-
Which sewage stage uses microorganisms to break down waste?
- Screening
- Anaerobic digestion
- Grit removal
- Sedimentation
-
What is the primary reason for removing grit early in sewage treatment?
- Prevent pipe blockages
- Remove toxic chemicals
- Neutralise pH levels
- Kill harmful bacteria
-
What is the primary function of the screening stage in sewage treatment?
- Dissolving organic matter
- Separating fine silt
- Removing large solids
- Killing harmful bacteria
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