Temperature Control

What is the temperature of the 'danger zone'?

• A0-15°C, the range used for chilled storage
• B15-60°C, measured at the surface of the food
• C60-80°C, just below cooking temperature
• D8-63°C (46-145°F)✓

Answer: Danger zone is 8-63°C (46-145°F). Pathogens multiply rapidly here. Keep food out of this range except for the short periods the law allows for service or display, and cool cooked food as quickly as possible.

Chicken is cooked to a core temperature of 70°C. How long should it stay at that temperature to be safely cooked?

• A10 seconds
• B30 seconds
• C2 minutes✓
• D6 seconds

Answer: At a core temperature of 70°C, chicken should be held for 2 minutes to be safely cooked. This is the accepted equivalent of 75°C for 30 seconds. Check the thickest part with a clean probe thermometer, without touching bone.

How can whole cuts of beef and lamb (such as steaks) be served?

• ARare if the outside is properly seared, but minced and rolled products must be cooked through (70°C for 2 minutes or equivalent)✓
• BOnly well done is ever safe, whatever the cut, so the centre of every steak must reach 71°C
• CBurgers and rolled joints can be served rare as well, provided the outside has been seared first
• DRare is never allowed, because the centre of any whole cut must always reach 63°C before serving

Answer: Bacteria sit on the surface of whole cuts, so searing the outside makes rare service possible. Mincing and rolling mix surface bacteria through the meat, so those products must be cooked through.

What is the lowest core temperature that makes pork safe when it is held there for just 30 seconds?

• A63°C
• B65°C
• C70°C
• D75°C✓

Answer: Pork is safely cooked when its core reaches 75°C for 30 seconds. Lower temperatures need longer: 70°C for 2 minutes or 65°C for 10 minutes. Check the thickest part with a clean probe thermometer.

Minced meat is cooked to a core temperature of 65°C. How long should it be held there to be safe?

• A30 seconds
• B2 minutes
• C6 seconds
• D10 minutes✓

Answer: At 65°C, minced meat should be held for 10 minutes to be safe. Mincing spreads surface bacteria all through the meat, so the whole of it must be cooked thoroughly. Common equivalents are 70°C for 2 minutes and 75°C for 30 seconds.

What is the safe cooking temperature for fish?

• A75°C✓
• B50°C
• C63°C
• D60°C

Answer: Fish should be cooked to a core temperature of 75°C for 30 seconds, or an equivalent such as 70°C for 2 minutes. This is the UK guidance for cooked food generally. The flesh should be opaque and flake easily.

Which eggs does UK government advice say can be served runny, even to vulnerable groups such as pregnant women and older people?

• AAny free-range hen eggs bought from a UK supplier
• BDuck eggs from a farm with a hygiene rating of 5
• CImported hen eggs, as long as they are kept below 8°C
• DHen eggs with the British Lion mark or Laid in Britain assurance✓

Answer: Hen eggs with the British Lion mark, or produced under the Laid in Britain scheme, can be eaten runny or even raw by vulnerable groups. Other hen eggs, and duck, goose or quail eggs, should be cooked until the white and yolk are solid for these groups. People who are severely immunocompromised should follow their medical advice.

How should temperatures be measured when cooking?

• ABy following the cooking time in the recipe and nothing else, adding ten minutes for a large joint
• BUsing the oven's own display, which shows the food temperature
• CUsing a calibrated food thermometer at the thickest part without touching bone✓
• DBy appearance alone, checking that the juices run clear and the colour has changed

Answer: Always use a calibrated food thermometer. Insert in the thickest part (usually between leg and breast for poultry, or centre of largest muscle for meat). Allow 2-3 seconds for dial thermometers, check digital display.

What temperature should hot food be held at for service?

• A50°C, checked once at the start of service
• B60°C, checked twice per shift
• C63°C or above✓
• D75°C as the legal minimum for holding

Answer: The legal minimum for hot holding is 63°C or above; many businesses set a higher target as a safety margin. Check temperatures regularly during service. Holding at 50-60°C leaves food in the danger zone, and 75°C is a common core cooking target rather than the holding requirement.

What temperature should chilled foods be stored at?

• A15°C or below
• BAny temperature below 20°C
• C8°C or below✓
• D0°C or below

Answer: Chilled foods should be stored at 8°C or below, which is the legal limit, and checked daily. Many businesses use 5°C or lower as a safety margin. Keep ready-to-eat foods on the top shelf.

What is the safe cooling procedure for food?

• ACool as quickly as possible, for example within 90 minutes, then refrigerate✓
• BCool slowly for eight hours at room temperature so the centre cools evenly
• CLeave it covered at room temperature overnight, then refrigerate
• DPut it straight into the freezer while it is still piping hot

Answer: Cooked food that is to be chilled must be cooled as quickly as possible. A common target is about 90 minutes, helped by dividing food into shallow containers or using a blast chiller. Hot food should not go straight into a fridge or freezer, as it warms the food around it.

What methods speed up cooling of large quantities of food?

• AOpening the kitchen windows to increase the flow of air over the containers
• BDividing into shallow containers, using ice baths, or blast chillers✓
• CCovering the containers tightly to hold the heat in
• DLeaving the food in large deep containers so it cools evenly overnight

Answer: Methods to speed cooling: Use shallow pans (increases surface area), ice baths, or blast chillers (rapidly reduce temperature to 8°C). Never use large containers for bulk cooling.

How should frozen food be safely thawed?

• AIn the microwave, then left on the side until needed
• BIn the refrigerator or under cold running water✓
• CIn warm or hot running water to speed the process up
• DOn the counter at room temperature, covered with a clean cloth

Answer: Safe thawing: In refrigerator (slow, safest), under cold running water (faster), or in microwave immediately before cooking. Never at room temperature or in warm water (pathogens multiply on surface).

How long can frozen food safely remain in a freezer?

• A6 months, after which it becomes unsafe even if still frozen
• B1 month, after which the food should be cooked and eaten
• CIndefinitely if temperature maintained below -18°C✓
• D2 years, provided the freezer is defrosted monthly

Answer: Frozen food remains safe indefinitely at -18°C or below. However, quality deteriorates over time. Proper storage extends shelf life. Ice crystals indicate thawing/refreezing - discard.

What is 'tempering' in temperature control?

• AAdjusting seasoning
• BSlowly heating oil
• CControlled partial thawing or warming of food before cooking, done in a refrigerator or other controlled conditions✓
• DMonitoring the temperature of the fridges and freezers at set points during the working day

Answer: Tempering is controlled partial thawing or warming before cooking. Do not temper meat or fish at room temperature, because the outside warms into the danger zone while the centre is still frozen.

What is the temperature danger zone for Clostridium perfringens?

• AAll bacteria share exactly the same growth range, so one danger zone covers them all
• B70-80°C, which is why stews held on a low heat overnight are high risk
• CBelow freezing, where the spores become active again
• DRapid growth at roughly 43-47°C, within the general 8-63°C danger zone✓

Answer: Clostridium perfringens grows fastest at roughly 43-47°C, within the general 8-63°C danger zone. Slow cooling lets surviving spores germinate and multiply, so cool cooked food quickly.

What is the correct way to reheat cooked food?

• AMicrowave for three minutes on full power and serve straight away without checking
• BReheat until steaming hot, at least 75°C at the centre✓
• CSlowly heat until warm
• DReheat it as often as needed until it is used up

Answer: Reheat food until it is steaming hot throughout, reaching at least 75°C at the centre (82°C in Scotland). 70°C for 2 minutes is an accepted equivalent. Reheat food only once, and check the temperature with a probe.

How often should refrigerator and freezer temperatures be checked?

• ADaily and recorded✓
• BWeekly, and written in the diary
• CMonthly, at the same time as the deep clean
• DOnly when appliances seem faulty

Answer: Temperatures must be checked and recorded daily. Use a calibrated thermometer placed in the warmest area (usually door). Record min/max overnight temperatures.

What is 'temperature abuse'?

• ACooking food too hot
• BTaking a temperature reading in the wrong place, such as the edge of a dish instead of the centre
• CFood remaining at improper temperatures for extended periods, allowing pathogen growth✓
• DServing hot food

Answer: Temperature abuse occurs when food is held in the danger zone too long. Examples: unrefrigerated salads left 4 hours, cooked meat left out overnight. This allows rapid pathogen multiplication.

What is 'heat penetration time'?

• AThe length of time a cooked food can safely be kept in storage
• BHow long a frozen item takes to thaw right through in a fridge
• CThe time taken to preheat an oven fully
• DTime for heat to reach the centre of food during cooking✓

Answer: Heat penetration time varies by food type, size, and equipment. Thick pieces take longer. Always measure internal temperature to ensure centre reaches safe temperature, not just surface.

What does '70°C for 2 minutes' mean in cooking (FSA standard)?

• AThe oven is set to 70°C and the food is cooked in it for a total of 2 minutes
• BThe food is held at that temperature for two hours
• C70°C is the minimum temperature; 2 minutes minimum time at that temperature✓
• D70°C measured on the outside of the food, with two minutes of cooking in total

Answer: This means the food centre must reach at least 70°C AND remain at that temperature (or higher) for at least 2 minutes (FSA standard). 75°C for 30 seconds is an acceptable equivalent. Higher temperatures allow shorter times.

What temperature gradient exists during cooking?

• AOnly surface temperature matters
• BThe temperature is the same throughout the food from the moment cooking begins until it ends
• COutside hotter than centre initially; centre eventually reaches safe temperature✓
• DTemperature decreases towards the centre

Answer: During cooking, the outside heats first, while the centre lags behind. This is why we measure internal temperature - to ensure the coldest (centre) point reaches safety.

What is the 'lag phase' in bacterial growth?

• ABacteria not growing (still adjusting to new environment)✓
• BThe phase in which the bacterial population begins to die off
• CThe point at which spores are formed by the bacteria
• DThe phase of rapid growth when numbers double every few minutes

Answer: Lag phase is when bacteria are adjusting to new conditions (like being placed on food). They don't multiply rapidly immediately. Understanding this helps explain why prompt cooling is critical.

Chilled food is put out on display above 8°C. What is the longest single period allowed before it must be chilled again or thrown away?

• A30 minutes, measured from when the food is put out
• B2 hours, the same limit that applies to hot food
• CLess than 4 hours, as one period only✓
• D6 hours, provided the food is then chilled

Answer: Chilled food may be kept above 8°C for service or display for one period of less than 4 hours. After that it must be chilled to 8°C or below and kept there until used, or thrown away. Hot food has a shorter limit: one period of less than 2 hours below 63°C.

What is 'passive heat abuse'?

• ACooking deliberately at a very high temperature to shorten the time food spends in the oven
• BOvercooking food
• CUnintentional temperature rise due to poor insulation, stacking, or warm environment✓
• DSlow cooking method

Answer: Passive heat abuse occurs when food unintentionally warms up due to poor storage conditions, stacked containers, warm kitchens, or insulated containers. Must be monitored and prevented.

What temperature should a calibrated thermometer read in ice water?

• A5°C
• B0°C✓
• C10°C
• D-5°C

Answer: Calibration check: Thermometer should read 0°C in ice water (ice + cold water mixture). If not, it needs adjustment. This verifies accuracy of temperature monitoring.

What is 'sous vide' cooking and its safety considerations?

• AA marketing term rather than a cooking method, used to describe slow braising
• BFast cooking
• CLow temperature water bath cooking requiring precise temperature control and sealed bags to prevent pathogens✓
• DHigh heat cooking

Answer: Sous vide: Food sealed in bags, cooked at precise low temperatures (e.g., 63-71°C). CRITICAL: Requires precise temperature control, proper sealing, immediate chilling. High-risk if improper.

What should be done with returned food from customers?

• AReturn it to stock if the packaging still looks clean and sealed
• BDiscard it, record the return and investigate the reason✓
• CRefreeze it if it is still cold, then use it within a week
• DServe it to other customers if it has not been touched

Answer: Food returned by a customer has left your control, so you cannot show it is safe. Do not re-serve, re-stock or refreeze it. Record the return and find out why it happened, in case it points to a wider problem.