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Rationales 2026 Q&A | Instant
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Question 1
Which tissue forms the outer covering of the crown of a tooth?
A. Dentin
B. Cementum
C. Enamel
D. Pulp
Correct Answer: C
Rationale:
Enamel is the highly mineralized outer layer covering the crown and is the hardest
substance in the human body. Dentin lies beneath enamel, cementum covers the
root, and the pulp contains nerves and blood vessels.
Question 2
Which tissue forms the bulk of a tooth?
A. Enamel
B. Dentin
C. Cementum
D. Gingiva
Correct Answer: B
Rationale:
Dentin makes up most of the tooth structure and supports the enamel and
cementum.
,Question 3
What is the primary function of cementum?
A. Cover the crown
B. Attach the periodontal ligament to the root
C. Produce saliva
D. Protect the pulp
Correct Answer: B
Rationale:
Cementum covers the root surface and provides attachment for periodontal
ligament fibers.
Question 4
Which part of the tooth contains nerves and blood vessels?
A. Enamel
B. Dentin
C. Pulp
D. Cementum
Correct Answer: C
Rationale:
The pulp contains connective tissue, nerves, blood vessels, and lymphatics that
nourish the tooth.
Question 5
How many permanent teeth are present in a complete adult dentition?
A. 20
B. 24
,C. 28
D. 32
Correct Answer: D
Rationale:
Adults normally have 32 permanent teeth, including four third molars.
Question 6
How many primary teeth are present in children?
A. 16
B. 20
C. 24
D. 28
Correct Answer: B
Rationale:
The primary dentition consists of 20 teeth.
Question 7
Which teeth are primarily designed for cutting food?
A. Molars
B. Premolars
C. Incisors
D. Canines
Correct Answer: C
Rationale:
Incisors have sharp edges designed for cutting and biting food.
Question 8
, Which teeth are primarily designed for tearing food?
A. Incisors
B. Canines
C. Premolars
D. Molars
Correct Answer: B
Rationale:
Canines have pointed cusps that are ideal for tearing food.
Question 9
Which teeth are primarily responsible for grinding food?
A. Incisors
B. Canines
C. Molars
D. Central incisors
Correct Answer: C
Rationale:
Molars have broad occlusal surfaces for grinding food.
Question 10
Which salivary gland produces the largest volume of saliva?
A. Sublingual gland
B. Parotid gland
C. Minor salivary glands
D. Buccal glands
Correct Answer: B