Chemical & Physical Hazards

Which of the following is classified as a physical hazard in food?

• AFood colouring
• BPesticides
• CCleaning chemical residue
• DGlass fragments✓

Answer: Physical hazards are foreign bodies in food such as glass, metal, stones, bone fragments, or plastic. These can cause choking or injury.

What should be done if a glass or ceramic dish breaks during food preparation?

• ASift the food through a fine sieve to remove the larger pieces
• BDiscard the batch of food and thoroughly clean the area✓
• CRinse the food under cold running water and continue serving
• DCook the food at a higher temperature to melt any glass particles

Answer: All affected food must be discarded as small glass fragments cannot be reliably removed. The area must be thoroughly cleaned and disinfected.

A cleaning chemical is decanted into an unlabelled squeezy bottle. Why is this a food safety hazard?

• AIt can be mistaken for a food ingredient and cause chemical contamination✓
• BIt breaches the rule that chemicals must always be stored in glass containers
• CIt shortens the working life of the chemical by exposing it to more light
• DIt is only a problem if the chemical is a disinfectant rather than a detergent

Answer: Decanting into an unlabelled container is one of the commonest routes to chemical contamination — sanitiser mistaken for oil, or descaler for vinegar. Chemicals must be kept in labelled containers, stored away from food, and never in a container that previously held food. The hazard is the same whichever type of chemical it is.

What is the purpose of cleaning chemicals in food preparation areas?

• ATo disinfect and kill microorganisms
• BTo remove food residue and grease
• CTo add flavour to food
• DBoth A and B✓

Answer: Cleaning chemicals have two purposes: to remove physical dirt (cleaning) and to kill microorganisms (disinfection). Both are essential for food safety.

What concentration range is typically recommended for bleach solutions used in food preparation areas?

• A100-150 ppm available chlorine✓
• B0.5-1 ppm available chlorine
• C5000+ ppm available chlorine
• D500-1000 ppm available chlorine

Answer: For disinfection in food areas, bleach solutions of 100-150 ppm available chlorine are typical. Lower concentrations are ineffective; higher concentrations may leave residues.

Which of the following is a sign of pest infestation that is a physical hazard?

• ARodent droppings in dry storage
• BCockroach faeces contaminating food
• CBoth A and B✓
• DNeither—pests only cause biological hazards

Answer: Pest droppings can introduce pathogens (biological hazard) but are also physical contamination. Both aspects make pest infestation a serious concern for food safety.

Which of these is a physical contamination hazard rather than a chemical or microbiological one?

• AA fragment of blue plaster that has come off a food handler's finger✓
• BSanitiser residue left on a work surface that was not rinsed
• CSalmonella transferred from raw chicken to a ready-to-eat salad
• DHistamine that has formed in fish stored above 8°C for too long

Answer: Physical contamination is a foreign object in the food — glass, metal, plastic, bone, hair, a plaster. Blue is used for catering plasters precisely because no food is naturally that colour, and many are metal-detectable. Sanitiser residue is chemical, salmonella is microbiological, and histamine is a chemical hazard produced by bacterial action.

What is the correct procedure if a chemical cleaning product is accidentally sprayed on food?

• AWipe the food with a clean damp cloth and serve it
• BDiscard the affected food immediately✓
• CCook the food at high temperature
• DWash the food thoroughly under running water

Answer: Any food contaminated with chemicals must be discarded. Washing may not remove all chemical residues and the food may not be safe.

Which is the most dangerous physical hazard in terms of likelihood of consumer injury?

• AGlass or ceramic fragments✓
• BHair
• CFragments of soft plastic wrapping film
• DFine metal shavings from a worn blade

Answer: Glass and ceramic fragments are the most dangerous because they can cause cuts to the mouth, throat, and internal injuries. Metal is a close second as it can cause severe cuts.

What should be the policy regarding jewellery worn in a food preparation area?

• AAll jewellery except watches should be removed
• BSmall jewellery is acceptable
• CJewellery is fine if hands are washed
• DAll jewellery including watches must be removed✓

Answer: All jewellery should be removed as it can harbour bacteria, catch in equipment, or break and contaminate food with physical fragments.

How should metal contamination be prevented in food production?

• AUse metal detectors and magnets at key points
• BRegular inspection of food processing equipment for wear
• CBoth A and B✓
• DNeither—metal is not a real hazard

Answer: Prevention requires both detection (metal detectors, magnets) and prevention (equipment maintenance, staff training, removal of jewellery and unsafe equipment).

Which cleaning chemical is commonly used for disinfection in food areas but requires careful rinsing?

• AWhite vinegar diluted with warm water
• BDetergent used on its own without rinsing
• CSodium hypochlorite (bleach)✓
• DHot water alone without any detergent

Answer: Sodium hypochlorite (bleach) is a common disinfectant but requires thorough rinsing to avoid residues that could contaminate food.

Under Natasha's Law, which of the following foods requires clear allergen information on the label or label-free display?

• AA bottle of olive oil
• BFactory-sealed packaged bread from a supermarket
• CCanned baked beans
• DA sandwich made and sold fresh by a cafe on the same day✓

Answer: Prepacked for direct sale (PPDS) foods like sandwiches made in-house and sold immediately must display full ingredient lists with allergen information under Natasha's Law.

What is a common source of glass contamination in a commercial kitchen?

• ABroken thermometers
• BBroken light bulbs or light covers
• CBroken glass storage containers
• DAll of the above✓

Answer: Glass can come from multiple sources: thermometers, light fittings, glass containers, and glassware. Any glass breakage is a serious hazard.

How should pesticides be safely stored in a food preparation business?

• AIn the main food storage area in clearly labelled containers
• BIn the same cupboard as cleaning chemicals
• CIn a separate, secure, locked area away from food✓
• DOn an open shelf above the preparation bench for easy access

Answer: Pesticides must be stored separately from food in a locked, secure area to prevent accidental contamination or misuse.

Which of the 14 major allergens is also known as a tree nut?

• ALupin flour, used in some gluten-free baking
• BPeanut
• CAlmond or cashew (included under 'nuts')✓
• DSesame

Answer: Tree nuts (almonds, cashews, walnuts, etc.) are listed under the single 'nuts' category in the 14 major allergens. Peanuts are legumes, listed separately.

What should a food business do if a customer reports finding a piece of plastic in their meal?

• AApologise and offer a replacement meal
• BDiscard the meal without investigating
• CAssume it was the customer's fault
• DDocument the incident, investigate the source, and follow the manufacturer recall procedure if needed✓

Answer: Any physical contamination incident must be documented, investigated to find the source, and appropriate corrective actions taken to prevent recurrence.

Which allergen is particularly important to declare due to the severity of allergic reactions?

• ACelery
• BPeanuts✓
• CSesame
• DFish

Answer: While all 14 major allergens are important, peanuts are particularly critical as they often trigger severe anaphylactic reactions in allergic individuals.

Why must a food business control the use of glass and brittle plastic in production areas?

• ABroken fragments can enter food and cause injury, and are hard to detect once mixed in✓
• BGlass and plastic attract pests more strongly than other packaging materials
• CThey react chemically with acidic foods and taint the flavour over time
• DThey are prohibited outright in any area where open food is handled

Answer: Glass and brittle plastic are controlled because a breakage puts sharp fragments into open food, where they can cause cuts and are very difficult to find. Businesses keep a glass register, use shatterproof fittings and covered lights, and follow a documented breakage procedure. They are controlled rather than banned outright.

According to UK regulations, who is responsible for ensuring allergen information is accurate and available to customers?

• AThe food business operator✓
• BOnly the ingredient supplier
• COnly the equipment manufacturer
• DThe customer themselves

Answer: The food business operator (FBO) is legally responsible for ensuring accurate allergen information is provided to customers in a clear, accessible manner.