Salting preserves food principally by doing what?

Drawing out water that microbes need

Canning was invented in response to what?

A prize offered for preserving food for armies

Smoking preserves food through which combination?

Drying plus antimicrobial compounds in the smoke

Freeze-drying removes water by doing what?

Freezing the food, then turning the ice straight to vapour under vacuum

Botulism is a particular hazard of what?

Improperly canned low-acid foods

Confit preserves meat by doing what?

Cooking it slowly in fat and sealing it under the same fat

Pasteurisation differs from sterilisation how?

It kills most microbes rather than all of them

Curing meat with nitrites does what, besides preserving?

Keeps the meat pink and adds flavour

How is this quiz scored?

Every correct answer adds to your score, and there is no penalty for a wrong one. Your result is shown at the end with a full review of each question.

Do I need an account to play?

No. Every quiz is free and playable without signing in. An account is optional and only used to save your progress across devices.

Are explanations included?

Yes. Every question is followed by a short explanation of why the correct answer is right, so the quiz is useful whether you score well or not.

Food & Drink Medium ⚡ 10 Questions ⏱️ ~7 Mins +100 XP

How Food Was Preserved Before Fridges

Q: Can I retake this quiz?

Yes. You can replay any quiz as many times as you like, and the questions and answer options are reshuffled each time.

Refrigeration is about a century old. Everything before it had to work another way.

Start Quiz

Questions

~7m

Duration

Medium

Difficulty

+100

Max XP

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.

Play it instead

Show all answers and explanationsHide answers

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.
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.
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.
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.
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.
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.
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.
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.
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.
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.

Read alongside this quiz

Why cooking works

Browning, resting, salting, seasoning a pan. The handful of chemical processes behind nearly every rule in the kitchen.

9 min read

Frequently Asked Questions

How is scoring calculated for this quiz?

Each correct answer awards 10 XP. There is zero point penalty for incorrect guesses, encouraging learning through exploration.

Can I retake this quiz?

Yes! You can retake any quiz as many times as you like, or use the Practice Mistakes mode at the end to review questions you missed.

Are explanations provided for every question?

Absolutely. As soon as you select an option, QuizKite displays a detailed explanation card explaining why the answer is correct.

QuizKite Quality Guarantee

Every quiz on QuizKite is researched, written and fact-checked by hand against reliable references, with an explanation for each answer. Read our full Editorial Policy to learn more about our content standards.

Keep going