CCS Food Safety & Quality Control 3 — Questions and Answers
Question 1: What is the primary purpose of Modified Atmosphere Packaging (MAP) in food quality control?
- Eliminating all oxygen to sterilize the product
- Altering gas composition to slow spoilage and extend shelf life (Correct answer)
- Increasing CO2 to acidify the food surface
- Replacing nitrogen with argon for antimicrobial effect
Correct answer: Altering gas composition to slow spoilage and extend shelf life
MAP modifies the atmosphere inside packaging—typically reducing O2 and increasing CO2 and/or N2—to slow microbial growth and oxidation without sterilization.
Question 2: During a HACCP audit, a Critical Control Point (CCP) is best described as:
- Any step where a quality defect could occur
- A step where control can be applied to prevent or eliminate a food safety hazard (Correct answer)
- A prerequisite program step that supports good manufacturing practices
- Any point in the process where temperature is monitored
Correct answer: A step where control can be applied to prevent or eliminate a food safety hazard
A CCP is a specific process step where control measures can be applied and are essential to prevent or reduce a food safety hazard to an acceptable level.
Question 3: Which mycotoxin is commonly associated with aflatoxin contamination in peanuts and corn, and is classified as a Group 1 carcinogen?
- Ochratoxin A
- Fumonisin B1
- Aflatoxin B1 (Correct answer)
- Deoxynivalenol (DON)
Correct answer: Aflatoxin B1
Aflatoxin B1, produced by Aspergillus flavus and A. parasiticus, is the most potent naturally occurring carcinogen classified as Group 1 by the International Agency for Research on Cancer.
Question 4: In food quality control, what does a Shewhart control chart primarily monitor?
- Supplier compliance with ingredient specifications
- Process variation over time to detect out-of-control conditions (Correct answer)
- Consumer acceptability scores from sensory panels
- Regulatory compliance with labeling requirements
Correct answer: Process variation over time to detect out-of-control conditions
Shewhart (X-bar/R) control charts plot process measurements over time with control limits to distinguish normal variation from special cause variation requiring intervention.
Question 5: The 'danger zone' for bacterial growth in foods is defined as temperatures between:
- 32°F and 140°F (0°C–60°C)
- 40°F and 140°F (4°C–60°C) (Correct answer)
- 45°F and 165°F (7°C–74°C)
- 50°F and 145°F (10°C–63°C)
Correct answer: 40°F and 140°F (4°C–60°C)
The FDA and USDA define the temperature danger zone as 40°F–140°F (4°C–60°C), where most foodborne pathogens multiply rapidly.
Question 6: Which sanitizer is most effective against norovirus on food contact surfaces and requires no rinsing at low concentrations?
- Quaternary ammonium compounds (QUATS)
- Iodophor solutions at 25 ppm
- Chlorine-based sanitizers (sodium hypochlorite) (Correct answer)
- Peracetic acid at 200 ppm
Correct answer: Chlorine-based sanitizers (sodium hypochlorite)
Chlorine-based sanitizers are the most effective and widely approved agents against norovirus on food contact surfaces, with EPA-registered solutions used at 50–200 ppm.
Question 7: What is the role of a 'kill step' in food processing from a HACCP perspective?
- A step that permanently prevents recontamination of the product
- A validated process step that reduces a target pathogen by a specified log reduction (Correct answer)
- A quality gate that rejects products failing sensory evaluation
- A sanitation procedure applied after equipment changeover
Correct answer: A validated process step that reduces a target pathogen by a specified log reduction
A kill step is a validated intervention (e.g., heat, irradiation, HPP) that achieves a defined log reduction of a target pathogen, such as a 5-log reduction of Salmonella.
CCS Food Safety & Quality Control 3
What is the primary purpose of Modified Atmosphere Packaging (MAP) in food quality control?