Food Safety Trivia
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109 free Food Safety trivia questions with answers — science & nature quiz, new questions added Oct 2026.
52 free Food safety trivia questions with answers. Food safety is one of those subjects everyone half-knows and few know cold. This quiz covers the practical rules (the 4-60 °C danger zone, the two-hour rule, fridge and cooking temperatures, where to stick the thermometer, why Americans refrigerate eggs), the microbes (Salmonella, Campylobacter, Listeria, E. coli O157, norovirus, Bacillus cereus and its 'fried rice syndrome', botulism and honey) and the natural toxins in nuts, reef fish and pufferfish. There is a history round too: Nicolas Appert and the birth of canning, Louis Pasteur, Semmelweis and handwashing, The Jungle and the 1906 Pure Food and Drug Act, Typhoid Mary, the Jack in the Box outbreak and the NASA origins of HACCP. It works as a training icebreaker for kitchen staff, a food-hygiene refresher or a pub-quiz round with a stomach-turning edge. Every answer has been checked against Wikipedia and shows its citation once you have answered.
30 of 109 questions with answers and explanations. Play the quiz
Q 01Food-safety agencies define the bacterial 'danger zone' as roughly what temperature range?
4 to 60 °C
4 to 60 °C (40 to 140 °F) is where germs multiply quickest, which is why big batches of leftovers go into shallow containers so they cool through it fast.
Q 02Under US guidance, perishable food left out at room temperature for more than how many hours should be thrown out?
Two
Two hours is the limit, but on a day above 32 °C (90 °F), like a summer picnic or inside a hot car, perishables should be refrigerated within one hour.
Q 03After a power cut, what does US guidance say shows thawing freezer food is safe to refreeze?
It still has ice crystals
It still has ice crystals, or sits at 4 °C (40 °F) or below, so it can be refrozen, but looks, smell and taste cannot tell you whether thawed food is safe.
Q 04Why does US food-safety guidance say to skip rinsing raw chicken?
It splashes germs onto nearby surfaces
It splashes germs onto nearby surfaces, so a rinse meant to clean the chicken raises the risk instead, while cooking it to a safe internal temperature kills the germs.
Q 05Why must ground beef reach 160 °F, when a steak is safe at 145 °F?
Grinding spreads surface germs inside
Grinding spreads surface germs inside, while bacteria on an intact steak mostly stay on the outside, and US inspectors treat blade-tenderized steaks as a risk for the same reason.
Q 06Where should the tip of a meat thermometer probe go?
The thickest part, not touching bone
The thickest part, not touching bone, gives the true reading, and a thermometer beats judging by eye, since ground beef can look brown and done before it is safely cooked.
Q 07WHO estimates contaminated food made roughly what share of the world's people ill in 2021?
1 in 9
1 in 9 people, some 866 million, fell ill from contaminated food in 2021, and the lost productivity alone cost an estimated US$310 billion.
Q 08The CDC's 2011 estimate put yearly foodborne illnesses in the US at roughly how many?
48 million
48 million is about 1 in 6 Americans a year, yet only about 9.4 million of those cases could be pinned on 31 known pathogens, and unspecified agents account for the rest.
Q 09Norovirus causes roughly what share of US foodborne illnesses traced to a known pathogen?
About 58%
About 58% of those illnesses are norovirus, and outbreaks most often start when an infected food worker handles ready-to-eat food during preparation.
Q 10Norovirus takes its name from an outbreak in 1968 at an elementary school in which Ohio town?
Norwalk
Norwalk's outbreak samples were saved, and in 1972 Albert Kapikian finally spotted the tiny virus in them using an electron microscope.
Q 11Why do alcohol-based hand sanitisers tend not to work against norovirus?
The virus has no lipid envelope
The virus has no lipid envelope for alcohol to break apart, which is why handwashing with soap and water beats sanitiser gel during norovirus outbreaks.
Q 12Which two categories of food are most often implicated in norovirus outbreaks?
Shellfish and salad ingredients
Shellfish and salad ingredients often reach the plate uncooked, so no heating step kills the virus before it is eaten.
Q 13In Rutgers' 2016 test of the five-second rule, which dropped food picked up the most bacteria?
Watermelon
Q 21Which paralysing nerve disorder is most commonly triggered by a bacterial infection caught from undercooked chicken?
Guillain-Barré syndrome
Guillain-Barré syndrome can follow because antibodies made against the bacterium's surface sugars also latch onto matching sugars on nerve cells.
Q 22The 1992-93 E. coli outbreak that killed four children was traced to undercooked beef patties from which chain?
Jack in the Box
Jack in the Box's outbreak pushed US regulators to declare E. coli O157:H7 an adulterant in raw ground beef, so contaminated meat could be pulled from sale.
Q 23Why can cattle carry E. coli O157:H7 without falling ill themselves?
Watermelon, the wettest food tested, picked up the most, and some bacteria crossed over in under a second, disproving the five-second rule.
Q 14A 2011 E. coli outbreak in Germany that killed dozens was traced to which food?
Sprouts
Sprouts carried the strain, and unusually, 88% of patients who developed the kidney-damaging haemolytic-uraemic syndrome were adults rather than young children.
Q 15Which pets did the US ban from sale below four inches long in 1975, to curb Salmonella in children?
Turtles
Turtles with shells under four inches were targeted because small children put them in their mouths, and the ban cut turtle-linked Salmonella cases among children.
Q 16Which food spread Salmonella to 714 people in 46 US states in 2008–09, killing nine?
Peanut butter
Peanut butter and paste from one company went into so many other foods, from cookies to ice cream, that the recall covered thousands of products.
Q 17Why must eggs be refrigerated in the US but not in much of Europe?
US producers wash them, eroding the cuticle
US producers wash them, eroding the cuticle, a natural barrier on the shell, which is why EU rules ban washing Class A eggs to keep bacteria from getting inside.
Q 18Which cattle disease led the EU to ban exports of British beef in 1996?
Mad cow disease
Mad cow disease had just been linked to new cases of Creutzfeldt-Jakob disease, a fatal human brain illness, so all British beef exports were halted.
Q 19Pregnant women are advised to avoid soft cheeses such as Brie and feta because of which bacterium?
Listeria
Listeria can cross the placenta, so an infection during pregnancy can cause miscarriage or stillbirth.
Q 20Raw poultry is a major source of which bacterium, one of the most common causes of gastroenteritis worldwide?
Campylobacter
Campylobacter lives in chickens' guts without making the birds ill, which is why so much raw poultry carries it.
They lack the toxin's receptor
They lack the toxin's receptor, so healthy-looking cattle act as a reservoir, and beef or fresh produce touched by their manure can carry the strain.
Q 24Which fish does FDA advice for pregnant women list as a 'choice to avoid' for high mercury?
Swordfish
Swordfish, like other large predatory fish, carries high levels of methylmercury, which can cause intellectual disability in young children.
Q 25Honey should not be fed to children under what age because it can contain botulism spores?
12 months
12 months is the advised cut-off, because swallowed spores can germinate in a younger child's immature gut and release toxin, which older children's gut defences prevent.
Q 26Foodborne botulism has most often resulted from home-canned foods with what characteristic?
Low acid content
Low acid content lets surviving spores grow, and since the spores outlast boiling, commercial canning uses much higher temperatures to kill them.
Q 27The word 'botulism' comes from the Latin word for what?
Sausage
Sausage is the root because the illness was first traced to tainted sausages, and 'sausage poisoning' was an old German name for it.
Q 28'Fried rice syndrome' is the nickname for poisoning by which spore-forming bacterium?
Bacillus cereus
Bacillus cereus contaminates starchy foods such as rice and pasta, and leaving them unrefrigerated after cooking lets it build up its vomiting toxin, cereulide.
Q 29Which cooking method do food scientists warn can leave red kidney beans' natural toxin intact?
Slow cooking
Slow cooking often stays below about 80 °C (176 °F), too cool to destroy the beans' lectin, while a proper boil breaks it down.
Q 30Aflatoxins, which contaminate crops such as maize, are produced by which type of organism?
Moulds
Moulds such as Aspergillus produce them, and in children, exposure to aflatoxins has been linked to stunted growth.