medical MCQs – Page 147

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 Review each marked answer and report any item that may be outdated or unclear.

2921. Which of the following is most important in strength ZOE_____________?
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A. Addition of few drops of water

B. Liquid powder ratio

C. Temperature of mixing stab

D. Speed of mixing

2922. The carat for Au foil used for restorations is_______________?
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A. 22

B. 18

C. 24

D. 20

2923. Which of the following are characteristic feature of high copper amalgam alloy ?
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A. High creep

B. Low compressive strength

C. High marginal breakdown

D. Less marginal #
2924. The main ingredient in dental plaster in_______________?
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A. Calcium sulphate dihydrate

B. Calcium anhydrate

C. Calcium phosphate

D. Calcium sulphate hemihydrate
2925. The tarnished layer of silver amalgam consists of________________?
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A. All of the above

B. Chlorides of tin

C. Sulphides of silver

D. Oxides of tin

2926. Amalgam means_____________?
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A. A metallic powder composed of silver, tin, copper and zinc

B. A metallic substances in powder or tablet from that is mixed with mercury

C. An alloy of two or more metals one of which is mercury

D. An alloy of two or more metals that have been dissolved in each other in the molten state

2927. Dynamic creep is the______________?
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A. Spread of amalgam during packing

B. Deformation of set amalgam during function

C. Process whereby alloy is wetted by murcury

D. Continuing alloying between silver-tin alloy and mercury during the life of restoration

2928. Porosity in porcelain at condensation stage depends on_________________?
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A. Number of particles

B. None of the above

C. Shape and size of particle

D. Uniform distribution of particle size

2929. Model plaster (white) used to cast study models before mixing with water, is largely composed of____________?
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A. CaO

B. CaCO3

C. (CaSO4)2-H2O

D. CaSO4-2H2O

2930. The effect of zinc oxide-eugenol on the pulp ?
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A. Is sedating

B. Is irritating

C. Has no effect

D. Encourages pulpal fibrosis

2931. Compared with dental alloys, CERAMICS show____________________?
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A. Low esthetic value

B. Susceptibility to brittle fracture

C. High ductility

D. High hardness

2932. Acid neutralizing substance in saliva_____________?
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A. NH3

B. Bicarbonate

C. Carbonate

D. Chlorides

2933. What is the most frequently used restorative material ?
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A. Silicate

B. Composite

C. Gold

D. Amalgam
2934. The cavity varnish applied reduces post operative sensitivity in amalgam restoration by____________?
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A. By preventing penetration of corrosion products into the dentinal tubules

B. By altering the chemical composition of restoration materials

C. Decreasing conduction of heat to pulp

D. Minimize marginal leakage around restoration
2935. True about myoepithelial cell______________?
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A. Structure is similar to smooth muscle and contains actin & myosin

B. The cell expel secretions by contraction

C. All of the above

D. Also known as basket cell

2936. High copper amalgam can be produced_____________?
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A. From traditional alloy particles

B. From irregular and spherical particles

C. From lathe cut particles

D. From smooth atomized particles

2937. Die is________________?
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A. Replica of whole teeth

B. Impression of whole teeth

C. Impression of single tooth

D. Replica of single tooth
2938. Which one of the following is not an objective of trituration ?
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A. Pulverize pelletes into particles to aid in attack by mercury

B. Keep the amount of gamma-1 or gamma-2 matrix crystals to maximum

C. Achieve a workable mass of amalgam in minimum time

D. Remove oxides from powder particle surface

2939. The setting of zinc phosphate is accelerated by_____________?
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A. Increasing mixing time

B. Adding a drop of oleic acid

C. Adding a drop of water

D. Cooling the slab

2940. Quartz is Dental porcelain is______________?
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A. Strengthener

B. Binder

C. Pigment

D. Crack minimzer