Texas Class A Barber Written ExamSanitation, Disinfection, and SafetyMedium
A barber is using a disinfectant that requires a contact time of 10 minutes. If the barber cleans the tools at 9:00 AM, at what time will the tools be properly disinfected and ready for use?
- A9:10 AM
- B9:05 AM
- C9:09 AM
- D9:11 AM
Show answer & explanationAnswer & explanation
Correct answer: A. 9:10 AM
Contact time (also known as dwell time) is the specific amount of time a disinfectant must remain wet on a surface or immersed with a tool to be effective. If cleaning concludes at 9:00 AM, and a 10-minute contact time is required, the tools will be disinfected and ready for use at 9:10 AM.
Why the other options are wrong
- B. 5 minutes is insufficient for a 10-minute contact time.
- C. 9 minutes is insufficient for a 10-minute contact time.
- D. 11 minutes is longer than required, but the earliest they are ready is at 10 minutes.
Disinfectant Contact Time
The specific duration a disinfectant must remain wet on a surface or in contact with an item to effectively kill target microorganisms.
- Crucial for disinfectant efficacy.
- Varies by product and target pathogens.
- Must be strictly followed for proper infection control.
Memory trick: Clean it first, then wet it well, and let the clock tell.