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