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NZ Food Safety & Hygiene study materials
NZ Food Safety & Hygiene study resources

NZ Food Safety & Hygiene practice questions

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Question 1Food safety hazards and foodborne illness

Which type of hazard are pathogenic bacteria such as Salmonella and Listeria classified as?

  1. Biological hazard Correct answer.
  2. Allergenic hazard
  3. Physical hazard
  4. Chemical hazard

Explanation

Hazards in food safety are grouped into biological, chemical, physical and allergenic categories. Pathogenic bacteria are living organisms and therefore belong to the biological group.

Question 2Food safety hazards and foodborne illness

A piece of broken glass is found in a prepared salad. What type of hazard does this represent?

  1. Biological
  2. Physical Correct answer.
  3. Radioactive
  4. Chemical

Explanation

Physical hazards are foreign objects that can cause injury or illness when consumed. Glass is a classic physical hazard because it can cut or damage the digestive tract.

Question 3Food safety hazards and foodborne illness

Which of the following is a common symptom of foodborne illness caused by bacterial infection?

  1. Sudden loss of hearing
  2. Blurred vision as the primary symptom
  3. Gastrointestinal upset such as vomiting and diarrhoea Correct answer.
  4. Joint swelling only

Explanation

Most foodborne bacterial infections produce gastrointestinal symptoms including nausea, vomiting, abdominal cramps and diarrhoea. These arise as the body responds to the pathogen or its toxins.

Question 4Food safety hazards and foodborne illness

What is the primary purpose of the temperature danger zone concept in food safety?

  1. To identify the range where bacteria multiply most rapidly Correct answer.
  2. To define the temperature for sterilising utensils
  3. To specify the temperature for reheating food
  4. To indicate the temperature at which food freezes

Explanation

The temperature danger zone (commonly 5°C to 60°C) is the range in which bacteria multiply most rapidly. Keeping food outside this range limits microbial growth.

Question 5Food safety hazards and foodborne illness

Which microorganism is most commonly associated with undercooked poultry causing foodborne illness?

  1. Aspergillus flavus
  2. Staphylococcus aureus
  3. Clostridium botulinum
  4. Campylobacter jejuni Correct answer.

Explanation

Campylobacter jejuni is frequently found on poultry and is a leading cause of bacterial foodborne illness when poultry is undercooked. Thorough cooking kills the organism.

Question 6Food safety hazards and foodborne illness

What is cross-contamination in a food handling context?

  1. Cooling food too slowly in a refrigerator
  2. Adding too many ingredients to a recipe
  3. The transfer of harmful microorganisms from one food or surface to another Correct answer.
  4. Cooking food at too high a temperature

Explanation

Cross-contamination is the transfer of harmful microorganisms, often from raw foods to ready-to-eat foods via hands, utensils or surfaces. Preventing it is a core food safety control.

Question 7Food safety hazards and foodborne illness

Which of the following is an example of a chemical hazard in food?

  1. A hair found in a meal
  2. A metal fragment from equipment
  3. Residues of cleaning chemicals on food contact surfaces Correct answer.
  4. Norovirus on a food handler's hands

Explanation

Chemical hazards include substances such as cleaning residues, pesticides and unapproved additives that can cause harm through toxicity. Cleaning chemical residue is a typical example.

Question 8Food safety hazards and foodborne illness

Why are ready-to-eat foods particularly risky if contaminated with pathogens?

  1. They are eaten without a further kill step such as cooking Correct answer.
  2. They are always served hot
  3. They contain more water than raw foods
  4. They are stored at higher temperatures than raw foods

Explanation

Ready-to-eat foods are consumed without a cooking step that would destroy pathogens. Any contamination present at the point of eating therefore reaches the consumer directly.

Question 9Food safety hazards and foodborne illness

A food handler develops vomiting and diarrhoea and continues preparing food. What is the most appropriate food safety action?

  1. Continue working but wear gloves
  2. Exclude the handler from food handling duties and report the illness Correct answer.
  3. Increase the cooking temperature of all foods
  4. Wash hands once at the start of the shift

Explanation

Food handlers with gastrointestinal symptoms can shed pathogens and contaminate food. They should be excluded from food handling and the illness reported to management so appropriate action is taken.

Question 10Food safety hazards and foodborne illness

Which practice best reduces the risk of Listeria monocytogenes in a chilled ready-to-eat food operation?

  1. Storing foods at 20°C to slow growth
  2. Increasing the sugar content of foods
  3. Adding more salt to all products
  4. Maintaining strict cold chain control and cleaning of chilled environments Correct answer.

Explanation

Listeria can grow at refrigeration temperatures, so strict cold chain control and thorough cleaning of chilled environments are key controls. These measures limit growth and prevent contamination.

Question 11Food safety hazards and foodborne illness

What is the main reason raw and cooked foods should be stored separately in a refrigerator?

  1. To prevent cross-contamination from dripping juices Correct answer.
  2. To reduce the number of shelves needed
  3. To improve the flavour of cooked foods
  4. To save energy

Explanation

Raw foods can drip juices containing pathogens onto cooked or ready-to-eat foods. Separating and storing raw foods below cooked foods prevents this cross-contamination.

Question 12Food safety hazards and foodborne illness

A chef reheats a batch of cooked rice for a second service. Which pathogen is of particular concern if the rice was cooled slowly?

  1. Trichinella spiralis
  2. Anisakis simplex
  3. Vibrio cholerae
  4. Bacillus cereus Correct answer.

Explanation

Bacillus cereus spores survive cooking and can germinate and produce toxin if cooked rice is cooled slowly and left at warm temperatures. Rapid cooling is the key control.

Question 13Food safety hazards and foodborne illness

Which of the following best describes a spore-forming pathogen of concern in low-acid canned foods?

  1. Listeria monocytogenes
  2. Clostridium botulinum Correct answer.
  3. Salmonella Typhi
  4. Escherichia coli

Explanation

Clostridium botulinum forms heat-resistant spores that can survive inadequate canning and produce a dangerous toxin in anaerobic, low-acid conditions. Proper thermal processing is essential.

Question 14Food safety hazards and foodborne illness

A food business receives a delivery of frozen chicken that has partially thawed. What is the most appropriate action?

  1. Refreeze it immediately and note the issue
  2. Reject the delivery and record the non-conformance Correct answer.
  3. Accept it and store it with ready-to-eat foods
  4. Cook it at a lower temperature to compensate

Explanation

A broken cold chain indicates a loss of temperature control and possible microbial growth. The delivery should be rejected and the non-conformance documented to protect food safety.

Question 15Food safety hazards and foodborne illness

Which hand hygiene step is essential before handling ready-to-eat food after using the toilet?

  1. Wiping hands on a clean cloth
  2. Rinsing hands briefly in cold water
  3. Thorough hand washing with soap and drying Correct answer.
  4. Using hand sanitiser alone without washing

Explanation

Thorough hand washing with soap and proper drying removes and reduces pathogens that can cause foodborne illness. This is especially critical after toilet use and before handling ready-to-eat food.

Question 16Food safety hazards and foodborne illness

What is the significance of the infective dose for a foodborne pathogen?

  1. It is the time taken for food to spoil
  2. It is the number of organisms needed to cause illness Correct answer.
  3. It is the amount of toxin removed by cooking
  4. It is the temperature at which the pathogen dies

Explanation

The infective dose is the number of organisms that must be ingested to cause illness. Pathogens with low infective doses, such as some viruses and parasites, pose a greater risk from small contamination events.

Question 17Food safety hazards and foodborne illness

Why is Staphylococcus aureus intoxication often linked to food handlers rather than to the food itself?

  1. The toxin is only formed during cooking
  2. The organism is destroyed by refrigeration
  3. The toxin is produced in food when handlers contaminate it and it is left at warm temperatures Correct answer.
  4. The bacteria grow only in soil

Explanation

Staphylococcus aureus can be carried on skin and in the nose and throat of food handlers. When handlers contaminate food that is then held at warm temperatures, the organism multiplies and produces toxin that is heat-stable.

Question 18Food safety hazards and foodborne illness

Which of the following is the most reliable way to confirm the cause of a suspected foodborne illness outbreak?

  1. Checking the colour of the food involved
  2. Asking customers which food tasted best
  3. Epidemiological investigation combined with laboratory testing Correct answer.
  4. Reviewing the restaurant's menu prices

Explanation

Outbreak confirmation relies on epidemiological investigation linking cases to a common source, supported by laboratory testing of clinical and food samples. Together these establish the causative agent and vehicle.

Question 19Food safety hazards and foodborne illness

What does the term 'potentially hazardous food' generally refer to?

  1. Food that is always served frozen
  2. Food that is high in fibre
  3. Food that contains no water
  4. Food that supports rapid growth of pathogenic microorganisms Correct answer.

Explanation

Potentially hazardous foods are those that can support rapid growth of pathogens, typically because they are moist, protein-rich and require temperature control. Examples include cooked meats, dairy and cooked rice.

Question 20Food safety hazards and foodborne illness

A vacuum-packed chilled fish product is found to be temperature abused. Which pathogen is of heightened concern because it can grow in anaerobic conditions?

  1. Yersinia pestis
  2. Shigella sonnei
  3. Mycobacterium tuberculosis
  4. Clostridium botulinum Correct answer.

Explanation

Vacuum packing removes oxygen and creates anaerobic conditions in which Clostridium botulinum can grow and produce toxin if temperature control fails. This is why vacuum-packed chilled foods require strict temperature control.

Question 21Food safety hazards and foodborne illness

Which factor most directly explains why high-risk foods should be cooled rapidly through the danger zone?

  1. It improves the colour of the food
  2. It minimises the time pathogens have to multiply at favourable temperatures Correct answer.
  3. It increases the water activity of the food
  4. It reduces the need for cleaning

Explanation

Rapid cooling limits the time food spends in the temperature range where bacteria multiply quickly. This directly reduces the opportunity for pathogen growth.

Question 22Food safety hazards and foodborne illness

A manufacturer finds that a batch of nut products may contain undeclared peanut. How should this be classified in hazard terms?

  1. A nutritional hazard
  2. An allergenic hazard Correct answer.
  3. A physical hazard
  4. A biological hazard

Explanation

Undeclared allergens such as peanut are classified as allergenic hazards because they can trigger severe immune reactions in sensitised consumers. Accurate labelling and allergen control are essential.

Question 23Food safety hazards and foodborne illness

Why is norovirus a particular challenge for food safety control in catering?

  1. It has a very low infective dose and spreads easily via hands and surfaces Correct answer.
  2. It cannot survive on food contact surfaces
  3. It is killed only by freezing
  4. It requires oxygen to survive

Explanation

Norovirus has a very low infective dose and spreads readily through contaminated hands, surfaces and food. This makes hand hygiene and surface cleaning critical controls in catering.

Question 24Food safety hazards and foodborne illness

A food safety manager is assessing a new process where raw and cooked products share a preparation bench with cleaning between uses. Which control is most critical to verify?

  1. The number of staff on shift
  2. The price of the cleaning chemicals
  3. The effectiveness of cleaning and disinfection between uses Correct answer.
  4. The bench's brand and colour

Explanation

When equipment is shared between raw and cooked products, the effectiveness of cleaning and disinfection is the critical control that prevents cross-contamination. Verification should confirm that the cleaning procedure actually removes pathogens.

Question 25Food safety hazards and foodborne illness

Which statement best explains why spores make some pathogens harder to control than vegetative bacteria?

  1. Spores only form in frozen foods
  2. Spores are always killed by normal cooking temperatures
  3. Spores are a type of toxin that cooking removes
  4. Spores are highly resistant structures that can survive heat and adverse conditions Correct answer.

Explanation

Bacterial spores are dormant, highly resistant structures that can survive heat and other adverse conditions and later germinate. This is why processes such as canning require specific thermal schedules to achieve sterility.

Question 26Food safety hazards and foodborne illness

Which type of hazard is a fragment of hard plastic that breaks off a food-contact surface into food?

  1. Allergenic hazard
  2. Chemical hazard
  3. Biological hazard
  4. Physical hazard Correct answer.

Explanation

Hazards are grouped by nature: biological (microbes and their toxins), chemical (cleaning agents, pesticides, allergens), and physical (hard or sharp foreign objects). A plastic fragment is a foreign object that can cause injury, so it is classified as physical.

Question 27Food safety hazards and foodborne illness

Which organism is most commonly associated with foodborne illness caused by undercooked poultry?

  1. Bacillus cereus
  2. Clostridium botulinum
  3. Campylobacter jejuni Correct answer.
  4. Staphylococcus aureus

Explanation

Campylobacter is widely carried in the gut of poultry and is a leading cause of bacterial gastroenteritis, with undercooked chicken and cross-contamination as key routes. The other organisms listed have different principal vehicles, such as canned low-acid foods or cooked rice.

Question 28Food safety hazards and foodborne illness

What is the primary purpose of keeping high-risk foods at or below 5 degrees Celsius?

  1. To improve the flavour of the food
  2. To slow the multiplication of bacteria Correct answer.
  3. To kill any bacteria already present
  4. To prevent the food from drying out

Explanation

Cold storage does not sterilise food; it slows bacterial growth so that populations stay low during the storage period. Refrigeration is a control measure against multiplication, not against survival of existing cells.

Question 29Food safety hazards and foodborne illness

A food business is deciding which foods to treat as highest risk for bacterial growth. Which property most strongly makes a food high risk?

  1. Dry texture and low protein content
  2. Low moisture and high acidity
  3. High salt content and low water activity
  4. High moisture and near-neutral acidity Correct answer.

Explanation

Bacteria need moisture and a suitable pH to multiply, so moist foods with near-neutral acidity support rapid growth if temperature is favourable. Dry, acidic, or heavily salted foods are intrinsically more stable because these conditions restrict microbial growth.

Question 30Food safety hazards and foodborne illness

A caterer prepares sandwiches by hand for a large event and several guests later report illness with vomiting about three hours after eating. Which cause best fits this short incubation period?

  1. Infection with Campylobacter jejuni
  2. Infection with Listeria monocytogenes
  3. Preformed toxin from Staphylococcus aureus Correct answer.
  4. Infection with Salmonella species

Explanation

Illness within a few hours of eating points to a preformed toxin rather than to infection, which requires colonisation and typically has a longer incubation. Hand-prepared foods held without temperature control are a classic setting for staphylococcal toxin production.

Question 31Food safety hazards and foodborne illness

A batch of cooked meat is left on a bench and cools slowly over several hours before refrigeration. Which control failure does this represent?

  1. Insufficient cooking of the raw ingredients
  2. Prolonged time in the bacterial growth temperature range Correct answer.
  3. Excessive drying of the product surface
  4. Inadequate cleaning of the preparation bench

Explanation

Slow cooling keeps food for a long time in the warm range in which bacteria multiply fastest, allowing large populations to develop. Rapid cooling through this range is the control that prevents that multiplication.

Question 32Food safety hazards and foodborne illness

Which measure most effectively prevents contamination of ready-to-eat food by Listeria monocytogenes in a chilled production area?

  1. Regular cleaning and sanitising of food-contact surfaces and the chill environment Correct answer.
  2. Relying on the product's acidity alone
  3. Increasing the salt content of the finished product
  4. Holding the product at ambient temperature for part of the day

Explanation

Listeria can persist in damp, chilled environments and form biofilms on surfaces, so environmental cleaning and sanitising are central to control. Because it grows at refrigeration temperatures, cold storage alone does not prevent its build-up.

Question 33Food safety hazards and foodborne illness

A hospital kitchen serves a soft cheese to a patient group that includes pregnant women and immunocompromised patients. Which pathogen is of greatest concern from this food?

  1. Bacillus cereus
  2. Clostridium perfringens
  3. Listeria monocytogenes Correct answer.
  4. Vibrio parahaemolyticus

Explanation

Listeria is a particular risk in soft cheeses and other chilled ready-to-eat foods because it grows at refrigeration temperatures and causes severe illness in pregnant and immunocompromised people. The other organisms are associated with different foods and routes.

Question 34Food safety hazards and foodborne illness

Which practice best reduces the risk of Clostridium perfringens illness in a canteen that serves large meat stews?

  1. Serving or chilling the stew promptly and reheating it thoroughly Correct answer.
  2. Adding extra spices to the stew before service
  3. Cooling the stew slowly overnight at room temperature
  4. Holding the stew warm for many hours before serving

Explanation

Clostridium perfringens multiplies rapidly when cooked meat is held warm or cooled slowly, and its spores survive ordinary cooking. Prompt serving or rapid chilling limits growth, and thorough reheating reduces vegetative cells.

Question 35Food safety hazards and foodborne illness

Why is a food handler with a discharging skin lesion on the hand a concern when preparing ready-to-eat food?

  1. The lesion can shed bacteria such as Staphylococcus aureus onto the food Correct answer.
  2. The lesion attracts insects to the kitchen
  3. The lesion changes the pH of the food being handled
  4. The lesion reduces the handler's ability to taste the food

Explanation

Infected skin lesions can carry large numbers of Staphylococcus aureus, which can contaminate food and produce toxin if the food is later held warm. Covering lesions and excluding affected handlers from ready-to-eat food work are standard controls.

Question 36Food safety hazards and foodborne illness

A food business wants to reduce the risk of viral gastroenteritis from shellfish served raw. Which control is most appropriate?

  1. Rinse the shellfish briefly in cold water before service
  2. Store the shellfish at room temperature before service
  3. Purchase shellfish from approved harvest areas and cook it thoroughly Correct answer.
  4. Rely on lemon juice to neutralise any virus present

Explanation

Viruses such as norovirus and hepatitis A can accumulate in shellfish from contaminated water and are not reliably inactivated by acidic dressings. Sourcing from approved harvest areas and thorough cooking are the effective controls.

Question 37Food safety hazards and foodborne illness

A processor identifies that a cleaning chemical could remain on a food-contact belt after sanitation. In a hazard analysis, how should this be classified?

  1. A chemical hazard requiring a rinse or verification step Correct answer.
  2. A physical hazard requiring a metal detector
  3. A quality defect requiring no control
  4. A biological hazard requiring a cook step

Explanation

Residues of cleaning chemicals are chemical hazards, and the control is usually adequate rinsing plus verification that residues are within acceptable limits. Metal detection and cooking address different hazard types.

Question 38Food safety hazards and foodborne illness

A manufacturer learns that a batch of cereal bars may contain peanut protein not declared on the label. Why is this treated as a serious safety issue rather than a quality issue?

  1. Peanut protein increases the water activity of the product
  2. Peanut protein makes the product spoil faster
  3. Peanut protein changes the colour of the product
  4. Peanut is a major allergen that can cause severe reactions in sensitised consumers Correct answer.

Explanation

Undeclared allergens are a recognised food safety hazard because sensitised consumers can react severely, even to small amounts. The risk is to health, not to shelf life or appearance.

Question 39Food safety hazards and foodborne illness

A ready-to-eat salad is prepared on a bench that was used for raw chicken and then wiped with a dry cloth. Which statement best explains the resulting risk?

  1. The dry cloth sterilises the bench but leaves visible marks
  2. The raw chicken juices improve the flavour of the salad
  3. Pathogens from the raw chicken can transfer to the salad and will not be killed before eating Correct answer.
  4. The salad's acidity will reliably destroy any transferred bacteria

Explanation

A dry wipe removes visible soil but does not adequately clean and sanitise the surface, so bacteria can transfer to the ready-to-eat food. Because the salad receives no kill step, any transferred pathogen survives to the consumer.

Question 40Food safety hazards and foodborne illness

Why do bacterial spores present a greater control challenge than vegetative bacterial cells in food processing?

  1. Spores resist heat and drying and can survive conditions that destroy vegetative cells Correct answer.
  2. Spores are destroyed by ordinary hand washing
  3. Spores are larger and are easily removed by filtration
  4. Spores multiply faster than vegetative cells at refrigeration temperatures

Explanation

Spores are dormant, highly resistant structures that survive heating, drying, and other stresses that inactivate growing cells. Control therefore depends on processes such as adequate thermal processing or preventing conditions that allow spores to germinate and grow.

Question 41Personal hygiene and hand hygiene

Under standard New Zealand food hygiene requirements, how long should a food handler spend washing their hands with soap and warm water?

  1. At least 60 seconds
  2. At least 2 minutes
  3. At least 20 seconds Correct answer.
  4. At least 5 seconds

Explanation

Thorough handwashing should last around 20 seconds, covering palms, backs of hands, between fingers and under nails before rinsing and drying. This duration allows soap to lift and remove transient microorganisms and soil.

Question 42Personal hygiene and hand hygiene

Which action is the correct way to dry hands after washing in a food handling area?

  1. Using a single-use paper towel or hand dryer Correct answer.
  2. Drying them on a reusable tea towel
  3. Shaking them dry in the air
  4. Wiping them on a cloth apron

Explanation

Hands should be dried with single-use paper towels or a hand dryer because reusable cloths can harbour and transfer microorganisms back onto clean hands. Effective drying also removes remaining bacteria.

Question 43Personal hygiene and hand hygiene

What is the first thing a food handler should do before starting handwashing?

  1. Dry hands with a towel
  2. Remove jewellery and watches Correct answer.
  3. Rinse hands in cold water
  4. Apply soap to dry hands

Explanation

Jewellery, watches and rings can trap dirt and microorganisms and prevent thorough cleaning, so they must be removed before washing. Soap is applied after wetting the hands, not before.

Question 44Personal hygiene and hand hygiene

A food handler is about to handle ready-to-eat food. Which hand condition must be fully covered before they continue?

  1. A healing paper cut on a fingertip
  2. A fresh cut on the hand Correct answer.
  3. A small scar from childhood
  4. A clean, intact fingernail

Explanation

Any open wound or fresh cut on the hands must be covered with a waterproof dressing, and where appropriate a brightly coloured detectable bandage, before handling food. This prevents blood and microorganisms entering food.

Question 45Personal hygiene and hand hygiene

Which of these is the correct order of steps for effective handwashing?

  1. Rinse, dry, apply soap, lather
  2. Apply soap, wet hands, dry, rinse
  3. Wet hands, apply soap, lather and scrub, rinse, dry Correct answer.
  4. Wet hands, dry, apply soap, rinse

Explanation

Hands should be wetted, soaped, lathered and scrubbed across all surfaces, then rinsed and dried. Drying comes last to avoid recontamination.

Question 46Personal hygiene and hand hygiene

Which of the following is a common source of food contamination that good personal hygiene is designed to control?

  1. Sealed food packaging
  2. Clean food-contact surfaces
  3. Properly chilled food
  4. Human hands and skin Correct answer.

Explanation

Hands and skin carry transient and resident microorganisms that can transfer to food, so hand hygiene is a primary control. Chilled food, sealed packaging and clean surfaces are controls, not sources.

Question 47Personal hygiene and hand hygiene

When should food handlers change their disposable gloves?

  1. Between handling raw food and ready-to-eat food Correct answer.
  2. Only at the end of the shift
  3. Once per hour regardless of task
  4. After every single item touched

Explanation

Gloves must be changed whenever they become contaminated, including between handling raw animal products and ready-to-eat food, to prevent cross-contamination. Gloves are not a substitute for handwashing.

Question 48Personal hygiene and hand hygiene

A food handler has been vomiting and has diarrhoea. What is the appropriate action regarding food handling?

  1. Work only with raw food until symptoms stop
  2. Take medication and continue working as normal
  3. Return to work once symptoms ease but continue handling food
  4. Exclude themselves from food handling duties and report to their supervisor Correct answer.

Explanation

Vomiting and diarrhoea may indicate a communicable illness that can be transmitted through food, so the handler must be excluded from food handling and report to their supervisor. Returning to work requires clearance under the food business's policy.

Question 49Personal hygiene and hand hygiene

Why should food handlers keep fingernails short and clean?

  1. Short nails are easier to polish
  2. Short nails help gloves fit better
  3. Long nails are more fashionable
  4. Short nails reduce dirt and bacteria trapped under the nail Correct answer.

Explanation

Dirt and microorganisms collect under fingernails, and short clean nails are easier to keep free of contamination. Nail polish and artificial nails can also chip into food and are generally restricted.

Question 50Personal hygiene and hand hygiene

A food handler sneezes into their hands while preparing sandwiches. What must they do before continuing?

  1. Apply hand sanitiser only
  2. Wipe hands on their apron and continue
  3. Rinse hands quickly under cold water
  4. Wash and dry hands thoroughly, then change gloves if worn Correct answer.

Explanation

Sneezing into hands contaminates them with respiratory secretions, so hands must be washed and dried thoroughly and any gloves replaced before resuming food handling. Hand sanitiser alone does not remove visible contamination.