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Medical Science Mcqs 5254 MCQs [All-Courses]

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Medical Science is the study of human health, diseases, prevention, and treatment, focusing on diagnosis, patient care, and medical research to improve healthcare outcomes.

All Topics  5254

Chronological hypoplasia is_____________?

A Hypoplasia of local origin
B Hypoplasia of systemic origin
C Hypoplasia of hereditary origin
D None of the above
Correct Answer: Hypoplasia of systemic origin

Dentino enamel junction is_________________?

A Non-scalloped
B Straight
C Scalloped and the convexities are directed towards dentin
D Scalloped and the convexities are directed towards enamel
Correct Answer: Scalloped and the convexities are directed towards dentin

The diameter of the rod is______________?

A 4 μ m
B 9 μ m
C 7 μ m
D 2 μ m
Correct Answer: 4 μ m

Inorganic content of enamel is about______________?

A 35%
B 50%
C 4%
D 96%
Correct Answer: 96%

calcification in enamel starts at____________?

A Enamel matrix
B Root
C CEJ
D DEJ
Correct Answer: DEJ

The enamel has no capacity of self repair because______________?

A It has only a small percent of organic content
B Its formative cells are lost once it is completely formed
C It is essentially a keratin tissue and has no blood vessels
D It has no direct connection with the active cells of the dental pulp
Correct Answer: Its formative cells are lost once it is completely formed

The formative cells of which of the following dental tissues disappear once tissue is formed___________?

A Enamel
B Dentin
C Periodontal ligament
D Cementum
Correct Answer: Enamel

On microscopic examination enamel rods have___________?

A Key hole appearance in cross section
B Paddle appearance in cross section
C Lanullate appearance in cross-section
D None of the above
Correct Answer: Key hole appearance in cross section

All are true about the striae of retzius except___________?

A Constitute the rest lines with in the enamel rods
B Have high inorganic content
C They are areas of increased porosity
D Allow the movement of water and small ions
Correct Answer: Have high inorganic content

Ionic exchange between enamel surface and environment______________?

A Does not take place once enamel surface and invironment
B Stops after 2 years of eruption
C Continues till adult life
D Continues through out life
Correct Answer: Continues through out life
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