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