Food Safety Cleaning & Sanitizing 1 — Questions and Answers
Question 1: What is the key difference between cleaning and sanitizing?
- They are the same process performed in sequence
- Cleaning removes dirt and debris; sanitizing reduces pathogens to safe levels (Correct answer)
- Sanitizing removes visible dirt; cleaning kills bacteria
- Cleaning kills all bacteria; sanitizing removes visible soil only
Correct answer: Cleaning removes dirt and debris; sanitizing reduces pathogens to safe levels
Cleaning removes visible food residue and dirt, while sanitizing uses heat or chemicals to reduce pathogen levels to safe numbers on surfaces.
Question 2: What is the minimum water temperature for hot-water sanitizing in a three-compartment sink?
- 120°F
- 140°F
- 171°F (Correct answer)
- 212°F
Correct answer: 171°F
When using hot water as the sanitizer in a three-compartment sink, water must reach a minimum of 171°F to effectively reduce pathogens.
Question 3: What is the correct concentration range for a chlorine (bleach) sanitizing solution?
- 10–25 ppm
- 50–100 ppm (Correct answer)
- 200–300 ppm
- 500 ppm or higher
Correct answer: 50–100 ppm
A chlorine sanitizing solution must be maintained at 50–100 ppm to be effective against pathogens without leaving harmful chemical residue.
Question 4: What must be done to a food contact surface between the cleaning and sanitizing steps?
- Apply sanitizer immediately after scrubbing
- Rinse with clean water to remove all soap residue (Correct answer)
- Allow it to air dry completely before sanitizing
- Wipe with a dry cloth to remove moisture
Correct answer: Rinse with clean water to remove all soap residue
Food contact surfaces must be rinsed with clean water after cleaning to remove soap residue, which can neutralize sanitizers and reduce their effectiveness.
Question 5: How long must a food contact surface remain in contact with sanitizing solution to be effective?
- 5 seconds
- 10 seconds
- The contact time specified by the sanitizer manufacturer, typically 7–30 seconds (Correct answer)
- 5 minutes minimum
Correct answer: The contact time specified by the sanitizer manufacturer, typically 7–30 seconds
Sanitizers require the specific contact time — usually 7 to 30 seconds as listed by the manufacturer — to reduce pathogens to safe levels.
Question 6: Which type of sanitizer remains most effective in hard water conditions?
- Chlorine (bleach)
- Iodine
- Quaternary ammonium (quats) (Correct answer)
- Hot water only
Correct answer: Quaternary ammonium (quats)
Quaternary ammonium compounds (quats) are less affected by the mineral content of hard water than chlorine, making them more reliable in hard-water areas.
Food Safety Cleaning & Sanitizing 1
What is the key difference between cleaning and sanitizing?