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How Food Was Preserved Before Fridges
Refrigeration is about a century old. Everything before it had to work another way.
About this topic
Every preservation method attacks the same problem from a different angle: microbes need water, warmth and a hospitable pH, so removing any one of those buys time. Salting and drying take the water. Smoking adds antimicrobial compounds and dries the surface. Pickling makes the environment too acidic. Canning sterilises and then seals. These questions cover the main techniques and the science underneath them — including canning, which was in industrial use for decades before anyone understood why it worked.
Questions & answers
How Food Was Preserved Before Fridges: all 10 questions and answers
Every question in this quiz is listed below with its correct answer and the reasoning behind it. Play first if you would rather not see the answers — or read through as a study sheet.
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1Salting preserves food principally by doing what?
- A Sealing the surface from air
- B Drawing out water that microbes need Correct
- C Killing bacteria on contact
- D Raising the temperature
Answer: B. Drawing out water that microbes need
Why: Lowering available water halts most microbial growth. It is the same principle behind preserving fruit in sugar.
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2Canning was invented in response to what?
- A A prize offered for preserving food for armies Correct
- B A famine in Ireland
- C A shortage of salt
- D A royal commission on health
Answer: A. A prize offered for preserving food for armies
Why: Nicolas Appert won a French government prize around 1810. Pasteur explained why the method worked half a century later.
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3Smoking preserves food through which combination?
- A Freezing the surface
- B Adding moisture
- C Removing salt
- D Drying plus antimicrobial compounds in the smoke Correct
Answer: D. Drying plus antimicrobial compounds in the smoke
Why: Phenols and other compounds in wood smoke inhibit microbes, while the heat and airflow dry the outer layer.
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4Pickling works by making the environment what?
- A Too cold
- B Too salty to taste
- C Too acidic for most microbes Correct
- D Too dry
Answer: C. Too acidic for most microbes
Why: Either by adding vinegar, or by encouraging bacteria that produce lactic acid, which is how sauerkraut and kimchi are made.
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5Freeze-drying removes water by doing what?
- A Coating it in salt
- B Freezing the food, then turning the ice straight to vapour under vacuum Correct
- C Boiling it slowly
- D Pressing it
Answer: B. Freezing the food, then turning the ice straight to vapour under vacuum
Why: Skipping the liquid stage preserves structure and flavour far better than heat drying, which is why it is used for instant coffee.
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6Botulism is a particular hazard of what?
- A Improperly canned low-acid foods Correct
- B Fresh fruit
- C Smoked fish only
- D Dried grains
Answer: A. Improperly canned low-acid foods
Why: The bacterium thrives without oxygen, which is exactly what a sealed can provides. Acidity or sufficient heat prevents it.
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7Confit preserves meat by doing what?
- A Freezing it in brine
- B Drying it in the sun
- C Burying it in salt only
- D Cooking it slowly in fat and sealing it under the same fat Correct
Answer: D. Cooking it slowly in fat and sealing it under the same fat
Why: The fat layer excludes air. The technique comes from southwest France and predates refrigeration by centuries.
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8Sugar preserves jam by the same basic mechanism as what?
- A Vinegar
- B Freezing
- C Salt Correct
- D Smoke
Answer: C. Salt
Why: Both bind water so it is unavailable to microbes. Jam needs a high enough sugar concentration to be reliable.
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9Pasteurisation differs from sterilisation how?
- A It requires a vacuum
- B It kills most microbes rather than all of them Correct
- C It uses no heat
- D It works only on solids
Answer: B. It kills most microbes rather than all of them
Why: It extends shelf life while preserving flavour, which is why pasteurised milk still needs refrigeration.
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10Curing meat with nitrites does what, besides preserving?
- A Keeps the meat pink and adds flavour Correct
- B Removes fat
- C Softens the texture
- D Prevents freezing
Answer: A. Keeps the meat pink and adds flavour
Why: Nitrites inhibit botulism specifically and react with the meat to fix the colour, which is why bacon stays pink when cooked.
Frequently asked questions about How Food Was Preserved Before Fridges
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How Food Was Preserved Before Fridges has 10 questions and takes about 7 minutes to finish. It is rated Medium and sits in our Food & Drink category.
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Yes. All 10 questions carry a written explanation of why the correct answer is right, so the quiz works as a study sheet as well as a test.
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Yes, as often as you like. The questions and the answer options are reshuffled on each run, and you can use Practice Mistakes afterwards to retry only the ones you missed. No account is needed to play.
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