FST 109 MIDTERM 1 | 149 QUESTIONS | WITH
COMPLETE SOLUTIONS!!
Course
FST 109
1. Question: What is the primary goal of pasteurization in food processing?
a) Improve food flavor
b) Enhance nutritional value
c) Eliminate all microorganisms
d) Reduce pathogenic bacteria to safe levels
Answer: d) Reduce pathogenic bacteria to safe levels.
Rationale: Pasteurization is designed to reduce the number of harmful pathogens to a level
that will not cause illness, while still maintaining the quality of the food product. It does not
aim to sterilize food but makes it safer for consumption.
2. Question: Which of the following is most commonly used as a food
preservative due to its ability to inhibit microbial growth?
a) Citric acid
b) Ascorbic acid
c) Sodium benzoate
d) Glutamic acid
Answer: c) Sodium benzoate.
Rationale: Sodium benzoate is widely used as a preservative in acidic foods and beverages
as it inhibits the growth of bacteria, yeast, and fungi, thereby extending the shelf life of food
products.
3. Question: What is the significance of the Maillard reaction in food
processing?
a) It preserves the color of food.
b) It enhances the nutritional value.
c) It produces browning and flavor in cooked foods.
d) It prevents food spoilage.
Answer: c) It produces browning and flavor in cooked foods.
,Rationale: The Maillard reaction is a chemical reaction between amino acids and reducing
sugars that gives browned foods their distinct flavor and color, such as in baking, roasting,
and grilling.
4. Question: Which foodborne pathogen is most commonly associated with
undercooked poultry?
a) Escherichia coli
b) Listeria monocytogenes
c) Campylobacter jejuni
d) Clostridium botulinum
Answer: c) Campylobacter jejuni.
Rationale: Campylobacter jejuni is a leading cause of bacterial foodborne illness and is
commonly associated with the consumption of undercooked or contaminated poultry
products.
5. Question: What is the role of HACCP (Hazard Analysis Critical Control
Point) in food safety management?
a) To standardize food labeling
b) To develop new food products
c) To identify and manage risks of foodborne hazards
d) To monitor the temperature during food processing
Answer: c) To identify and manage risks of foodborne hazards.
Rationale: HACCP is a systematic approach to food safety that focuses on identifying
critical control points in food production where hazards can be prevented, eliminated, or
reduced to safe levels.
6. Question: Which of the following methods is commonly used to measure the
water activity (Aw) in food?
a) pH meter
b) Refractometer
c) Hygrometer
d) Spectrophotometer
Answer: c) Hygrometer.
,Rationale: Water activity (Aw) is a key factor in determining food shelf life and safety. A
hygrometer is commonly used to measure the water activity of foods, which influences
microbial growth and spoilage.
7. Question: Which type of food packaging is most effective in reducing the
oxidation of food products?
a) Paper-based packaging
b) Modified atmosphere packaging (MAP)
c) Vacuum packaging
d) Glass jars
Answer: c) Vacuum packaging.
Rationale: Vacuum packaging removes air (especially oxygen), which reduces oxidation and
extends the shelf life of food by slowing down the spoilage caused by oxidation and aerobic
microorganisms.
8. Question: What is the main purpose of food fortification?
a) To enhance flavor and color
b) To improve texture and consistency
c) To increase the nutrient content of foods
d) To make food more appealing visually
Answer: c) To increase the nutrient content of foods.
Rationale: Food fortification involves adding vitamins, minerals, and other essential
nutrients to foods to prevent nutritional deficiencies in the population, such as adding vitamin
D to milk or iodine to salt.
9. Question: Which microorganism is used in the production of yogurt?
a) Saccharomyces cerevisiae
b) Lactobacillus bulgaricus
c) Escherichia coli
d) Clostridium perfringens
Answer: b) Lactobacillus bulgaricus.
Rationale: Lactobacillus bulgaricus, along with Streptococcus thermophilus, is a key
bacterium used in the fermentation of milk to produce yogurt by converting lactose into lactic
acid, which gives yogurt its tangy flavor.
, 10. Question: What is the main factor that causes enzymatic browning in
fruits like apples and bananas?
a) Oxidation of sugars
b) Oxidation of phenolic compounds
c) Maillard reaction
d) Protein denaturation
Answer: b) Oxidation of phenolic compounds.
Rationale: Enzymatic browning occurs when phenolic compounds in fruits are exposed to
oxygen, resulting in the formation of brown pigments. This process is catalyzed by the
enzyme polyphenol oxidase.
11. Question: What is the main function of emulsifiers in food products?
a) To increase sweetness
b) To prevent microbial growth
c) To stabilize mixtures of oil and water
d) To enhance food coloring
Answer: c) To stabilize mixtures of oil and water.
Rationale: Emulsifiers help keep ingredients like oil and water mixed together, preventing
separation and providing a stable texture in products like mayonnaise, ice cream, and salad
dressings.
12. Question: Which of the following is an example of a food product that
undergoes fermentation?
a) Cheese
b) Soda
c) Canned soup
d) Dehydrated fruit
Answer: a) Cheese.
Rationale: Cheese is a fermented food product where bacteria or enzymes break down milk
proteins, altering texture and flavor during the aging process.
13. Question: What is the purpose of blanching vegetables before freezing?
COMPLETE SOLUTIONS!!
Course
FST 109
1. Question: What is the primary goal of pasteurization in food processing?
a) Improve food flavor
b) Enhance nutritional value
c) Eliminate all microorganisms
d) Reduce pathogenic bacteria to safe levels
Answer: d) Reduce pathogenic bacteria to safe levels.
Rationale: Pasteurization is designed to reduce the number of harmful pathogens to a level
that will not cause illness, while still maintaining the quality of the food product. It does not
aim to sterilize food but makes it safer for consumption.
2. Question: Which of the following is most commonly used as a food
preservative due to its ability to inhibit microbial growth?
a) Citric acid
b) Ascorbic acid
c) Sodium benzoate
d) Glutamic acid
Answer: c) Sodium benzoate.
Rationale: Sodium benzoate is widely used as a preservative in acidic foods and beverages
as it inhibits the growth of bacteria, yeast, and fungi, thereby extending the shelf life of food
products.
3. Question: What is the significance of the Maillard reaction in food
processing?
a) It preserves the color of food.
b) It enhances the nutritional value.
c) It produces browning and flavor in cooked foods.
d) It prevents food spoilage.
Answer: c) It produces browning and flavor in cooked foods.
,Rationale: The Maillard reaction is a chemical reaction between amino acids and reducing
sugars that gives browned foods their distinct flavor and color, such as in baking, roasting,
and grilling.
4. Question: Which foodborne pathogen is most commonly associated with
undercooked poultry?
a) Escherichia coli
b) Listeria monocytogenes
c) Campylobacter jejuni
d) Clostridium botulinum
Answer: c) Campylobacter jejuni.
Rationale: Campylobacter jejuni is a leading cause of bacterial foodborne illness and is
commonly associated with the consumption of undercooked or contaminated poultry
products.
5. Question: What is the role of HACCP (Hazard Analysis Critical Control
Point) in food safety management?
a) To standardize food labeling
b) To develop new food products
c) To identify and manage risks of foodborne hazards
d) To monitor the temperature during food processing
Answer: c) To identify and manage risks of foodborne hazards.
Rationale: HACCP is a systematic approach to food safety that focuses on identifying
critical control points in food production where hazards can be prevented, eliminated, or
reduced to safe levels.
6. Question: Which of the following methods is commonly used to measure the
water activity (Aw) in food?
a) pH meter
b) Refractometer
c) Hygrometer
d) Spectrophotometer
Answer: c) Hygrometer.
,Rationale: Water activity (Aw) is a key factor in determining food shelf life and safety. A
hygrometer is commonly used to measure the water activity of foods, which influences
microbial growth and spoilage.
7. Question: Which type of food packaging is most effective in reducing the
oxidation of food products?
a) Paper-based packaging
b) Modified atmosphere packaging (MAP)
c) Vacuum packaging
d) Glass jars
Answer: c) Vacuum packaging.
Rationale: Vacuum packaging removes air (especially oxygen), which reduces oxidation and
extends the shelf life of food by slowing down the spoilage caused by oxidation and aerobic
microorganisms.
8. Question: What is the main purpose of food fortification?
a) To enhance flavor and color
b) To improve texture and consistency
c) To increase the nutrient content of foods
d) To make food more appealing visually
Answer: c) To increase the nutrient content of foods.
Rationale: Food fortification involves adding vitamins, minerals, and other essential
nutrients to foods to prevent nutritional deficiencies in the population, such as adding vitamin
D to milk or iodine to salt.
9. Question: Which microorganism is used in the production of yogurt?
a) Saccharomyces cerevisiae
b) Lactobacillus bulgaricus
c) Escherichia coli
d) Clostridium perfringens
Answer: b) Lactobacillus bulgaricus.
Rationale: Lactobacillus bulgaricus, along with Streptococcus thermophilus, is a key
bacterium used in the fermentation of milk to produce yogurt by converting lactose into lactic
acid, which gives yogurt its tangy flavor.
, 10. Question: What is the main factor that causes enzymatic browning in
fruits like apples and bananas?
a) Oxidation of sugars
b) Oxidation of phenolic compounds
c) Maillard reaction
d) Protein denaturation
Answer: b) Oxidation of phenolic compounds.
Rationale: Enzymatic browning occurs when phenolic compounds in fruits are exposed to
oxygen, resulting in the formation of brown pigments. This process is catalyzed by the
enzyme polyphenol oxidase.
11. Question: What is the main function of emulsifiers in food products?
a) To increase sweetness
b) To prevent microbial growth
c) To stabilize mixtures of oil and water
d) To enhance food coloring
Answer: c) To stabilize mixtures of oil and water.
Rationale: Emulsifiers help keep ingredients like oil and water mixed together, preventing
separation and providing a stable texture in products like mayonnaise, ice cream, and salad
dressings.
12. Question: Which of the following is an example of a food product that
undergoes fermentation?
a) Cheese
b) Soda
c) Canned soup
d) Dehydrated fruit
Answer: a) Cheese.
Rationale: Cheese is a fermented food product where bacteria or enzymes break down milk
proteins, altering texture and flavor during the aging process.
13. Question: What is the purpose of blanching vegetables before freezing?
