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