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How to preserve food through canning
Contributed by: Black
  • 1. What is the primary purpose of canning?
A) Changing color
B) Increasing size
C) Preventing spoilage
D) Adding flavor
  • 2. Which type of bacteria is a major concern in canning?
A) Escherichia coli
B) Clostridium botulinum
C) Staphylococcus aureus
D) Salmonella
  • 3. What kills harmful microorganisms during canning?
A) Freezing
B) Refrigeration
C) Washing
D) Heat processing
  • 4. What type of canner is recommended for low-acid foods?
A) Pressure canner
B) Steam canner
C) Water bath canner
D) Microwave oven
  • 5. What should the headspace be when canning?
A) Specified amount
B) Doesn't matter
C) Completely empty
D) Completely full
  • 6. What is the purpose of headspace?
A) Reduce cooking time
B) Increase flavor
C) Allow for expansion
D) Prevent discoloration
  • 7. What is the process of removing air bubbles from a jar called?
A) Debubbling
B) Purging
C) Filtering
D) Aerating
  • 8. Which type of seal is safe for canned goods?
A) Bubbly seal
B) Vacuum seal
C) Rusty seal
D) Loose seal
  • 9. How long should canned goods be stored before eating?
A) Refrigerate immediately
B) Freeze immediately
C) Eat immediately
D) Wait a day to cool before storing.
  • 10. What happens if a jar doesn't seal properly?
A) Refrigerate immediately and use soon.
B) It's safe to store.
C) Store at room temperature
D) Re-process immediately
  • 11. Why is it important to follow a tested canning recipe?
A) Reduces cost
B) Makes it easier
C) Ensures safe processing time
D) Guarantees flavor
  • 12. What type of food requires the highest processing time?
A) Jams
B) Low-acid foods
C) High-acid foods
D) Fruits
  • 13. What is the best material for canning jars?
A) Aluminum
B) Tempered glass
C) Copper
D) Plastic
  • 14. What is the proper way to cool canned jars?
A) Under cold water
B) At room temperature
C) In the refrigerator
D) In the freezer
  • 15. What is 'Botulism'?
A) A canning tool
B) A fruit preservative
C) A severe food poisoning
D) A can seal
  • 16. How do you test for proper jar sealing after processing?
A) Lid is easy to remove
B) Lid does not flex when pressed
C) Lid flexes slightly
D) Lid is bulging
  • 17. Why should you vent a pressure canner before pressurizing?
A) To sterilize the canner
B) To add water
C) To remove air
D) To add pressure
  • 18. Which food should always be canned using a pressure canner?
A) Jelly
B) Applesauce
C) Strawberries
D) Green beans
  • 19. What does 'raw packing' mean in canning?
A) Putting uncooked food in jars
B) Putting cooked food in jars
C) Packing loosely
D) Packing tightly
  • 20. What does 'hot packing' mean in canning?
A) Packing loosely
B) Putting preheated food in jars
C) Packing tightly
D) Putting cold food in jars
  • 21. What does high acidity do to botulism?
A) Has no effect
B) Inhibits botulism growth
C) Promotes botulism growth
D) Changes the flavor
  • 22. How long should you boil high-acid canned goods?
A) 1 hour
B) 30 minutes
C) 10 minutes
D) Follow recipe instructions
  • 23. What should you do if a canned food shows signs of spoilage?
A) Discard it
B) Give it to a neighbor
C) Taste it carefully
D) Re-process it
  • 24. Why is it important to use new lids for canning?
A) To ensure a proper seal
B) To prevent rust
C) To save money
D) For cleanliness
  • 25. What does it mean to 'vent' a pressure canner?
A) Release pressure quickly
B) Add water
C) Clean the canner
D) Exhaust steam before pressurizing
  • 26. Why are high-acid foods safe in a water bath canner?
A) They need less heat
B) Water boils at a lower temperature
C) They don't need to be processed
D) Acidity prevents botulism growth
  • 27. What is pectin used for in canning?
A) To add flavor
B) To preserve color
C) To prevent mold
D) To thicken jams and jellies
  • 28. What is the best way to clean canning jars before use?
A) Wash in hot, soapy water
B) Boil in salt water
C) Wipe with a dry cloth
D) Rinse with cold water
  • 29. Where should canned goods be stored?
A) Refrigerator
B) Humid, bright place
C) Warm, sunny place
D) Cool, dark, dry place
  • 30. What should you do if the pressure in a pressure canner drops during processing?
A) Ignore it and continue processing
B) Add more water to the canner
C) Remove the canner from heat immediately
D) Bring back to pressure and re-process
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