Water Treatment and Potable Water Quiz
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5 questions, one answer each
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1. What does the term 'potable water' mean?
- A. Water that is safe to drink but not necessarily pure
- B. Water that is completely pure with no dissolved substances
- C. Water that has been boiled to remove all microorganisms
- D. Water that contains added minerals for health benefits
2. Which of the following is the correct order of stages in treating fresh water to make it potable in the UK?
- A. Sterilisation, filtration, sedimentation
- B. Sedimentation, filtration, sterilisation
- C. Filtration, sedimentation, sterilisation
- D. Sterilisation, sedimentation, filtration
3. Why is desalination of sea water by reverse osmosis more expensive than the UK's conventional water treatment process?
- A. It requires more chlorine to sterilise the water
- B. It is more energy-intensive due to the high pressures needed to force water through membranes
- C. It produces more waste products that need disposal
- D. It requires additional filtration stages not used in conventional treatment
4. Countries with limited freshwater supplies often use distillation to desalinate sea water. What is a disadvantage of this method compared to UK freshwater treatment?
- A. It cannot remove dissolved salts from water
- B. It requires far more energy to heat and evaporate water, making it expensive and unsustainable
- C. It produces water that is less safe to drink than water from UK sources
- D. It involves using toxic chemicals during the sterilisation process
5. Which statement correctly compares the advantages and disadvantages of adding fluoride to water supplies?
- A. Fluoride prevents tooth decay in children, but some people argue it is unethical to add chemicals without individual choice, and excessive fluoride can cause dental fluorosis
- B. Fluoride is always beneficial with no documented disadvantages, and it is the most cost-effective water treatment method
- C. Fluoride has no effect on tooth health but is added because it improves the taste of water
- D. Adding fluoride is more effective than sterilisation at killing harmful microorganisms in water