Household Water Treatment MCQ Quiz | Environment & Sanitation

Welcome, future medical professionals, to this specialized quiz on Household Water Treatment, a critical component of the Environment & Sanitation syllabus. This quiz is designed to test your understanding of various methods used to make water safe for consumption at the household level, a cornerstone of preventive medicine. You will be challenged on topics ranging from boiling and filtration to chemical disinfection like chlorination and modern techniques such as SODIS and UV treatment. Understanding these methods is vital for advising communities and preventing waterborne diseases. This assessment consists of 25 multiple-choice questions. After submitting your answers, you’ll see your score and a detailed review. You can also download all questions with their correct answers in a PDF format for future reference.

1. What is the most effective and widely recommended method for killing all types of pathogenic organisms in water at the household level?

2. What is the primary purpose of the Horrock’s Apparatus in a community setting?

3. The recommended minimum level of free residual chlorine in drinking water at the consumer’s end is:

4. Solar Water Disinfection (SODIS) is most effective due to the combined action of:

5. Which of the following pathogens is known to be highly resistant to chlorine disinfection?

6. A major disadvantage of using boiling as a household water treatment method is that it:

7. Which process involves the addition of a chemical like alum to water to encourage suspended particles to clump together?

8. The three-pot system for water purification at the household level primarily relies on which principle?

9. Break-point chlorination is the point at which:

10. For SODIS to be effective, the water turbidity should be less than:

11. UV radiation primarily disinfects water by:

12. Which household water treatment method is most effective at removing chemical contaminants like pesticides and heavy metals?

13. The “multi-barrier approach” to safe drinking water means:

14. What is the minimum contact time required for effective disinfection after adding a chlorine solution to clear water?

15. A significant concern with the long-term use of iodine tablets for water disinfection is its effect on the:

16. Biosand filters remove pathogens primarily through a combination of mechanical trapping and:

17. Which of these methods is LEAST effective against viruses?

18. The process of adding a very high dose of chlorine to water, often in response to a contamination event, is known as:

19. A simple, no-cost physical method to improve water quality by removing some suspended solids and pathogens before further treatment is:

20. Which of the following is NOT a suitable container material for SODIS?

21. Ozonation is a powerful disinfection method, but its main limitation for municipal supply is:

22. Orthotolidine-arsenite (OTA) test is used to measure:

23. The primary target of most common household water treatment methods (like boiling, chlorination, filtration) is the removal or inactivation of:

24. What is the process called when excess chlorine is removed after superchlorination, often using sodium thiosulphate?

25. Filtration of water using a cloth (like a sari) is a traditional method primarily effective for removing: