NDTR Food Science & Food Service Exam 2026/2027 | 300 Practice Questions, Correct Answers & Detailed Rationales

NDTR Food Science & Food Service Exam 2026/2027 | 300 Practice
Questions, Correct Answers & Detailed Rationales

Question 1
Which nutrient provides the greatest amount of energy per gram?
A. Carbohydrate
B. Protein
C. Fat
D. Water
Correct Answer: C. Fat
Rationale: Fat provides approximately 9 kcal per gram, while
carbohydrate and protein provide approximately 4 kcal per gram.
Water provides no calories.

Question 2
Which process changes liquid milk into a semisolid product such as
yogurt?
A. Fermentation
B. Dehydration
C. Distillation
D. Freezing
Correct Answer: A. Fermentation
Rationale: Fermentation uses microorganisms, such as beneficial
bacteria, to convert lactose into lactic acid. The increased acidity
causes milk proteins to coagulate and produces yogurt's characteristic
texture and flavor.

Question 3
What is the primary purpose of pasteurization?

,A. To remove all microorganisms
B. To destroy disease-causing microorganisms
C. To increase the fat content of food
D. To remove water from food
Correct Answer: B. To destroy disease-causing microorganisms
Rationale: Pasteurization uses controlled heat treatment to reduce
pathogenic microorganisms to safer levels. It does not sterilize food or
eliminate every microorganism.

Question 4
Which cooking method uses hot liquid or steam to transfer heat to
food?
A. Conduction
B. Radiation
C. Convection
D. Fermentation
Correct Answer: C. Convection
Rationale: Convection transfers heat through the movement of a
fluid, such as water, broth, or air. Boiling and steaming are common
examples.

Question 5
Which food is considered a high-quality source of complete protein?
A. White rice
B. Egg
C. Apple
D. Olive oil
Correct Answer: B. Egg
Rationale: Eggs contain all nine essential amino acids in amounts that
adequately support human protein needs, making them a complete
protein source.

,Question 6
What is the primary function of gluten in wheat-based dough?
A. It provides sweetness
B. It traps gases and contributes to structure
C. It prevents browning
D. It removes moisture
Correct Answer: B. It traps gases and contributes to structure
Rationale: Gluten develops when wheat proteins are hydrated and
mixed. The gluten network provides elasticity and helps retain carbon
dioxide produced by yeast, allowing bread to rise.

Question 7
Which ingredient is primarily responsible for leavening yeast bread?
A. Sodium chloride
B. Yeast
C. Vegetable oil
D. Egg yolk
Correct Answer: B. Yeast
Rationale: Yeast ferments available sugars and produces carbon
dioxide. The gas becomes trapped within the gluten network, causing
the dough to expand.

Question 8
What happens to most starch when it is heated in the presence of
water?
A. It undergoes gelatinization
B. It becomes completely dehydrated
C. It becomes an amino acid
D. It loses all carbohydrates
Correct Answer: A. It undergoes gelatinization

, Rationale: During gelatinization, starch granules absorb water and
swell when heated. This increases viscosity and is important in
products such as sauces, gravies, and cooked cereals.

Question 9
Which food component is primarily responsible for the browning of
bread crust during baking?
A. Maillard reaction products
B. Water
C. Cellulose
D. Sodium chloride alone
Correct Answer: A. Maillard reaction products
Rationale: The Maillard reaction occurs between reducing sugars and
amino compounds during heating. It produces brown pigments and
many of the flavors and aromas associated with baked foods.

Question 10
Which type of fat is generally liquid at room temperature?
A. Saturated fat
B. Unsaturated fat
C. Trans fat
D. Hydrogenated fat
Correct Answer: B. Unsaturated fat
Rationale: Unsaturated fatty acids contain one or more double bonds
that create bends in their structure, generally making them liquid at
room temperature. Many plant oils are rich in unsaturated fats.

Question 11
What is the safest general method for thawing frozen meat?