How to preserve food
  • 1. Which of these is NOT a common method of food preservation?
A) Canning
B) Drying
C) Digestion
D) Freezing
  • 2. What is the primary goal of food preservation?
A) Change the flavor
B) Prevent spoilage
C) Increase cost
D) Make food more colorful
  • 3. What does canning do to preserve food?
A) Increases acidity
B) Creates an airtight seal
C) Adds vitamins
D) Changes the texture
  • 4. What is the main principle behind drying food?
A) Adding salt
B) Removing moisture
C) Adding sugar
D) Increasing temperature
  • 5. Which of these foods is commonly preserved through pickling?
A) Apples
B) Steak
C) Cucumbers
D) Bananas
  • 6. What does freezing food primarily prevent?
A) Microbial growth
B) Color fading
C) Oxidation
D) Enzyme activity
  • 7. What substance is typically used in smoking food for preservation?
A) Sugar
B) Wood smoke
C) Oil
D) Vinegar
  • 8. What is irradiation used for in food preservation?
A) Adding flavor
B) Changing texture
C) Killing microorganisms
D) Increasing nutrients
  • 9. Which gas is sometimes used in modified atmosphere packaging (MAP)?
A) Nitrogen
B) Methane
C) Oxygen
D) Hydrogen
  • 10. What is the role of salt in curing meat?
A) Increases moisture
B) Tenderizes meat
C) Adds sweetness
D) Inhibits bacterial growth
  • 11. Which type of acid is commonly used in pickling?
A) Lactic acid
B) Citric acid
C) Acetic acid
D) Ascorbic acid
  • 12. What temperature range is generally considered the 'danger zone' for food safety?
A) 40°F - 140°F
B) 150°F - 212°F
C) 0°F - 32°F
D) 212°F - 250°F
  • 13. Which preservation method relies on removing air to prevent oxidation and spoilage?
A) Pasteurization
B) Vacuum packing
C) Brining
D) Fermentation
  • 14. What effect does sugar have on the water activity of food?
A) Has no effect
B) Changes its pH
C) Increases it
D) Decreases it
  • 15. What process involves heating liquids to kill bacteria and then cooling them?
A) Dehydration
B) Pasteurization
C) Blanching
D) Sterilization
  • 16. Which preservation method often uses a combination of salt, sugar, and spices?
A) Curing
B) Drying
C) Freezing
D) Canning
  • 17. What is the purpose of blanching vegetables before freezing them?
A) To add flavor
B) To remove vitamins
C) To inactivate enzymes
D) To change the texture
  • 18. Which type of food is most often preserved by fermentation?
A) Bread
B) Apples
C) Beef
D) Cabbage
  • 19. What is the role of microbes in food fermentation?
A) Increase moisture
B) Add sugar
C) Eliminate nutrients
D) Produce acids
  • 20. Which fruit is commonly preserved using the jam-making process?
A) Potatoes
B) Strawberries
C) Lettuce
D) Carrots
  • 21. What is the purpose of adding pectin to jam?
A) To increase acidity
B) To add flavor
C) To help it gel
D) To prevent spoilage
  • 22. Which of the following methods best preserves the nutritional value of food?
A) Canning
B) Drying
C) Pickling
D) Freezing
  • 23. What is the benefit of using a pressure canner for low-acid foods?
A) Uses less water
B) Is faster
C) Preserves color better
D) Reaches higher temperatures
  • 24. What type of container is generally NOT recommended for freezing liquids?
A) Silicone container
B) Plastic freezer bag
C) Glass jar filled to the top
D) Rigid plastic container
  • 25. What is 'water activity' in relation to food preservation?
A) Total water content
B) Water temperature
C) Available water for microbial growth
D) Water pH
  • 26. What is the main ingredient in brining?
A) Vinegar
B) Oil
C) Sugar
D) Salt
  • 27. Which of these is NOT a sign of spoilage in canned goods?
A) Bulging lid
B) Foul odor
C) Rusting can
D) Slight cloudiness
  • 28. What does 'aseptic packaging' mean?
A) Sterilized food in a sterilized container
B) Packaging that is easy to open
C) Packaging made from recycled materials
D) Food packaged without preservatives
  • 29. Why is it important to properly label and date preserved food?
A) To improve appearance
B) To track storage time
C) To increase sales
D) To add nutritional information
  • 30. What is a common ingredient used in preserving citrus fruits?
A) Salt
B) Sugar
C) Oil
D) Vinegar
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