Disinfection Methods MCQ Quiz | Infection Control

1. According to Spaulding’s classification, instruments that contact sterile tissue, such as surgical instruments, are classified as critical items and require:

2. Which of the following is considered a high-level disinfectant capable of killing bacterial spores with sufficient exposure time?

3. The primary mechanism of action for alcohols like ethanol and isopropanol as disinfectants is:

4. The standard temperature, pressure, and time for sterilization in an autoclave are:

5. Which disinfectant is most commonly recommended for cleaning blood spills in a clinical setting?

6. Ethylene Oxide (ETO) gas is a preferred method for sterilizing:

7. Povidone-Iodine, commonly used as a skin antiseptic, belongs to which class of disinfectants?

8. Low-level disinfectants are generally ineffective against which of the following?

9. Pasteurization of milk is a method of:

10. The microbicidal action of Ultraviolet (UV) radiation is primarily due to:

11. An activated 2% glutaraldehyde solution achieves sporicidal activity most effectively under which condition?

12. The antimicrobial activity of Quaternary Ammonium Compounds (QACs) is significantly reduced by the presence of:

13. An endoscope, which contacts mucous membranes but does not penetrate sterile body cavities, is categorized as a:

14. A hot air oven is a method of dry heat sterilization. A typical cycle for sterilizing glassware is:

15. The most widely used chemical for the disinfection of municipal water supplies is:

16. An advantage of peracetic acid as a high-level disinfectant and sterilant is that it:

17. Which of the following factors is LEAST likely to influence the efficacy of a chemical disinfectant?

18. “Tincture of iodine” is a formulation of iodine mixed with:

19. Which sterilizing gas is known to be carcinogenic and requires a lengthy post-sterilization aeration period to remove toxic residues?

20. The Phenol Coefficient Test is used to measure the:

21. The term ‘antisepsis’ specifically refers to the:

22. A key advantage of Ortho-phthalaldehyde (OPA) over glutaraldehyde for high-level disinfection is that OPA:

23. From the following list, which is considered the most resistant to disinfection and sterilization processes?

24. Filtration is an effective method of sterilization for:

25. The popular antiseptic solution Savlon is a combination of which two agents?