medical MCQs – Page 121

Practise multiple-choice questions from medical for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

medical Mcqs

1. oral anatomy 2. microbiology 3. oral pathology and medicine 4. physiology 5. biochemistry 6. general anatomy 7. dental materials 8. pharmacology 9. pathology 10. oral histology

2401. Angles between Adhesive and Adherent is Zero degree, it indicates_______________?
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A. Rough surfaces between Adhesive & Adherent

B. Irregularities present between Adherent surfaces

C. Adherent and Adhesive molecules are tangent to each other

D. Complete wetting of surfaces

2402. Porosity present in a acrylic denture is usually the result of______________?
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A. A prolonged curing cycle

B. Insufficient acrylic resin monomer

C. Lack of sufficient pressure applied to flask

D. Prolonged bench cooling after curing

2403. A restorative material which has a high proportional limit, compared with one with a lower proportional limit would have________________?
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A. A higher modulus of elasticity

B. More resistance to permanent deformation

C. Greater ductility

D. Greater toughness

E. A higher modulus of elasticity

2404. The most frequently encountered clostridial species in gas gangrene is______________?
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A. Clostridium tetani

B. Clostridium difficile

C. Clostridium botulinum

D. Clostridium welchii

2405. Which of the following characteristics of bacteria is not true?
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A. Free living

B. Cell wall containing muramic acid

C. Having either DNA or RNA

D. Unicellular

2406. The modulus of elasticity is defined as_______________?
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A. The stress at the proportional limit

B. The strain at the proportional limit

C. None of the above

D. The stress/strain ratio within the proportional limit

2407. All of the following statements about the differences between self-polymerizing acrylic resins and heat-cured resins are true EXCEPT______________?
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A. The former have greater transverse strength

B. The former have higher residual monomer content

C. The former have a lower molecular weight

D. The former are more porous

2408. Ability of an orthodontic wire to spring back to its original shape is evaluated by_____________?
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A. Brittleness

B. Tensile strength

C. Resilience

D. Toughness

2409. Brinnel hardness number of a dental gold alloy is directly proportional to its______________?
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A. Modulus of resilience

B. Modulus of elasticity

C. Tensile strength

D. Elongation

2410. Liquids which become more rigid as the rate of deformation increases is termed as_____________?
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A. Newton

B. Thixotropic

C. Pseudoplastic

D. Dilatant

2411. Pickling________________?
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A. Is accomplished by soaking the casting in baking soda

B. Removes surface oxides from gold castings

C. Causes porosity in gold

D. Remove investment from gold casting

2412. The latest method of curing denture base resins______________?
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A. Visible light

B. Chemicals

C. Heat

D. Lasers

2413. If curing occurs at temperature more than 100C porosity results in which area of denture______________?
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A. Thin Palatal area

B. Hard thick central area

C. Porosity is uniformly distributed

D. Thin area of flanges

2414. Acrylic (cold cure)______________?
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A. Melts at 100C

B. Still requires heat for polymerization

C. Softens at 100C

D. Produces heat during polymerization

2415. Which of the following is present in the powder of the acrylic resin______________?
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A. Hydroquinone

B. D-methyl paratolouidine

C. Methyl methacrylate

D. Benzoyl peroxide

2416. The process wherein two or more chemically different monomers, each with some desirable property, can be combined to yield specific physical properties of a polymer is known as_____________?
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A. Condensation polymerization

B. Addition polymerization

C. Step-growth polymerization

D. Copolymerization

2417. Which of the following physical property can be used to estimate indirectly the proportional limit of gold alloys ?
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A. Brinell hardness number

B. Rockwell hardness number

C. Knoop hardness number

D. Vickerss hardness number

2418. A good adhesive should possess all of the following EXCEPT________________?
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A. High flow

B. High contact angle

C. Low contact angle

D. High adherend wetting

2419. Residual monomer content of chemically activated resins is______________?
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A. 2% to 5%

B. 0.2% to 0.5%

C. 0.3% to 0.5%

D. 2% to 5%

2420. Which one of the following is the result of applying a load to a wire below its modulus of elasticity on a load deflection diagram ?
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A. Spring back

B. permanent deformation

C. Increase in stiffness

D. Fracture of the wire

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