Preservation methods (drying, freezing, canning) MCQs December 27, 2025August 2, 2024 by u930973931_answers 50 min Score: 0 Attempted: 0/50 Subscribe 1. What is the primary purpose of drying food? (A) Enhance flavor (B) Increase nutritional value (C) Reduce water activity (D) Change color 2. Sun drying is most effective in which type of climate? (A) Humid (B) Dry (C) Tropical (D) Arctic 3. Which food is commonly dried using the spray drying method? (A) Milk (B) Vegetables (C) Fruits (D) Meat 4. What is the main disadvantage of sun drying? (A) Low energy cost (B) Long drying time (C) High nutritional loss (D) Requires specialized equipment 5. Which of the following is a commonly used method for drying herbs? (A) Air drying (B) Drum drying (C) Freeze drying (D) Spray drying 6. Freeze drying is also known as: (A) Sublimation (B) Dehydration (C) Lyophilization (D) Desiccation 7. What is the primary advantage of freeze drying over other drying methods? (A) Lower cost (B) Faster process (C) Better retention of flavor and nutrients (D) Simpler equipment 8. Which of the following foods is not typically dried? (A) Apples (B) Fish (C) Bananas (D) Milk 9. What type of drying method uses a rotating drum? (A) Spray drying (B) Freeze drying (C) Drum drying (D) Sun drying 10. The primary objective of drying food is to: (A) Enhance taste (B) Preserve nutrients (C) Prevent microbial growth (D) Reduce weight 11. What is the main benefit of freezing food? (A) Enhances flavor (B) Preserves food quality and nutrients (C) Destroys all bacteria (D) Reduces calorie content 12. Which temperature range is typically used for freezing food? (A) 0°C to 4°C (B) 1°C to -5°C (C) 5°C to 10°C (D) 18°C to -40°C 13. Which of the following is a common problem associated with freezing food? (A) Freezer burn (B) Off-flavors (C) Nutrient loss (D) Increased moisture content 14. What is the primary cause of freezer burn? (A) Dehydration (B) Oxidation (C) Bacterial contamination (D) Overcooking 15. Blanching vegetables before freezing helps to: (A) Add flavor (B) Reduce nutrient loss (C) Increase shelf life (D) Destroy enzymes 16. What is the ideal storage temperature for frozen food to maintain quality? (A) 18°C (B) 10°C (C) 0°C (D) 25°C 17. Which of the following foods should not be frozen? (A) Meat (B) Bread (C) Lettuce (D) Fish 18. The formation of large ice crystals in frozen food is primarily due to: (A) High water content (B) Rapid freezing (C) Blanching (D) Slow freezing 19. Which packaging material is commonly used to prevent freezer burn? (A) Plastic wrap (B) Aluminum foil (C) Vacuum-sealed bags (D) Paper bags 20. What is the best method to defrost frozen food? (A) At room temperature (B) In the refrigerator (C) In the microwave (D) Under hot water 21. What is the primary purpose of canning food? (A) Improve taste (B) Enhance color (C) Increase nutrient content (D) Extend shelf life 22. Which microorganism is a major concern in canning low-acid foods? (A) E. coli (B) Salmonella (C) Listeria (D) Clostridium botulinum 23. What is the typical pH range of high-acid foods suitable for water bath canning? (A) 3.5 – 4.6 (B) 2.0 – 3.0 (C) 5.0 – 6.0 (D) 6.5 – 7.5 24. What type of canning is recommended for low-acid foods? (A) Pressure canning (B) Water bath canning (C) Open kettle canning (D) Steam canning 25. Which of the following is a key step in the canning process to ensure safety? (A) Rapid cooling (B) Boiling the food (C) Sterilizing the jars (D) Adding preservatives 26. Which food is typically canned using the water bath method? (A) Green beans (B) Applesauce (C) Carrots (D) Meat 27. What is the main advantage of pressure canning over water bath canning? (A) Ability to process low-acid foods safely (B) Better flavor retention (C) Simplicity (D) Lower cost 28. Which gas is commonly used in modified atmosphere canning to preserve food? (A) Nitrogen (B) Oxygen (C) Carbon dioxide (D) Helium 29. What is the primary reason for using glass jars in home canning? (A) Reusability (B) Aesthetic appeal (C) Improved flavor (D) Transparency 30. Which of the following is a sign of spoilage in canned food? (A) Vacuum-sealed lid (B) Clear liquid (C) Intact seal (D) Swollen can 31. The process of removing water from food to inhibit the growth of microorganisms is called: (A) Blanching (B) Pasteurization (C) Drying (D) Fermentation 32. Which preservation method involves heating food to a specific temperature to kill pathogens and then sealing it in containers? (A) Canning (B) Freezing (C) Drying (D) Pickling 33. The main advantage of freezing food is: (A) Enhanced flavor (B) Reduced weight (C) Increased nutrient content (D) Longer shelf life 34. Which drying method involves the sublimation of ice from frozen food? (A) Sun drying (B) Freeze drying (C) Air drying (D) Drum drying 35. Which of the following is a key consideration in choosing a preservation method? (A) Color of the food (B) Flavor enhancement (C) Nutrient retention (D) Ease of preparation 36. What is the main purpose of blanching vegetables before freezing? (A) Enhance flavor (B) Preserve color (C) Increase shelf life (D) Destroy enzymes 37. What is the recommended method for defrosting frozen food safely? (A) At room temperature (B) In the microwave (C) Under hot water (D) In the refrigerator 38. In the canning process, what is the purpose of using a pressure canner? (A) To remove air from the jars (B) To enhance the flavor of the food (C) To increase the temperature to kill bacteria (D) To speed up the cooling process 39. Which of the following preservation methods is most suitable for preserving fruits and vegetables at home? (A) All of the above (B) Freezing (C) Canning (D) Drying 40. For which type of food is canning considered least effective? (A) Fruits (B) Vegetables (C) Dairy products (D) Meat 41. What is a common indicator that canned food has not been processed correctly? (A) Rust on the can (B) Clear liquid (C) Tight seal (D) Vibrant color 42. Which preservation method involves the use of chemical preservatives to extend shelf life? (A) Drying (B) Freezing (C) Canning (D) Not applicable 43. What is the primary goal of using vacuum sealing in food preservation? (A) Prevent spoilage (B) Enhance flavor (C) Improve texture (D) Increase color intensity 44. In which preservation method is high temperature combined with rapid cooling used? (A) Freezing (B) Pasteurization (C) Canning (D) Drying 45. What is a key factor in preventing microbial growth in dried foods? (A) Temperature (B) Color of the food (C) Moisture content (D) Texture 46. Which method is often used to extend the shelf life of baked goods? (A) Freezing (B) Drying (C) Canning (D) Pickling 47. Which of the following methods is NOT used for preserving meat? (A) Canning (B) Pickling (C) Drying (D) Freezing 48. What does the term ‘blanching’ refer to in the context of food preservation? (A) Adding preservatives (B) Cooking food briefly in boiling water (C) Drying food in the sun (D) Freezing food rapidly 49. Which food preservation method is most effective for maintaining the flavor and texture of food? (A) Drying (B) Canning (C) Freezing (D) Pickling 50. Which of the following is a disadvantage of canning? (A) Nutritional loss (B) Expensive equipment (C) All of the above (D) Time-consuming process