medical MCQs – Page 129

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 Review each marked answer and report any item that may be outdated or unclear.

2561. The most commonly used Titanium alloy for dental and medical purposes is________________?
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A. Ti 5Al 5V

B. Ti 6Al 6V

C. Ti 6Al 4V

D. Ti 5Al 4V

2562. Modern dental noble metal casting alloys generally have equiaxed fine grain structures because of the incorporation of small amounts of______________?
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A. Irridium

B. Palladium

C. Indium

D. Chromium

2563. Syringe material is______________?
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A. High viscosity elastomer

B. Medium viscosity elastomer

C. Low viscosity elastomer

D. Medium & low viscosity elastomer

2564. Powders of dental plaster and dental stone differ mainly in____________?
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A. Particle porosity

B. Solubility

C. Chemical formula

D. Shelf life

2565. The component in very minor quantity in stainless steel that changes the properties to a maximum level is____________?
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A. Carbon

B. Nickel

C. Molybdenum

D. Chromium

2566. Titanium casting is done_____________?
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A. Under air pressure in nitrogen atmosphere

B. In specially fabricated aluminium vanadium

C. Using CAD-CAM technique

D. Under vacuum in argon atmosphere
2567. Impression compound base_____________?
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A. Crystalline structure

B. High fusion temperature

C. Formation of cross linkage with heating

D. Low thermal conductivity
2568. Asbestos liner is used in a casting ring to________________?
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A. Facilitate venting of the mold

B. Permit expansion of the world

C. All of the above

D. Retard the heating of the investment

2569. The impression with the least dimensional change upon disinfection is_______________?
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A. Polysulphide

B. Polyether

C. Agar-agar

D. Addition poly silicone
2570. Percentage of gold in high noble alloy is______________?
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A. N 25%

B. 25%

C. 0%

D. >40%
2571. Fins and spines on the casting is seen due to_______________?
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A. Rapid heating me

B. Water film contamination

C. Prolonged heating:

D. Too high pressure during casting

2572. The impression for a diagnostic cast of a partial edentulous mouth should be taken in_______________?
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A. Impression wax

B. Hydro-colloid

C. Modelling compound

D. Hydro cal

2573. Alginates are_____________?
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A. Colloid

B. Gel

C. Sol

D. Hydrocolloid
2574. Tublulence of molten gold is due to _____________?
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A. A and B

B. None of the above

C. Impurities in gold

D. Improper venting

2575. Linear contraction of elostomeric impression with passage of time is highest in______________?
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A. Polysulphide

B. Addition silicone

C. Condensation silicone

D. Polyetner

2576. Which one of the following increase the strength and reduce viscosity of agar hydrocolloid impression material_____________?
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A. Borax

B. Carbonates

C. Sulfates

D. Water

2577. Masterial causing minimum tissue distortion is______________?
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A. Impression plaster

B. Silicone

C. Zinc oxide eugenol paster

D. Polysulphide

2578. Gypsum is used for________________?
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A. Impressions

B. Casts

C. Die

D. Casts and Dies
2579. Addition of large amounts of platinum to a casting gold alloy will________________?
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A. Decrease its strength and ability to be hardened

B. Increase its fusion temperature

C. Redden the alloy

D. Decrease its tarnish resistance

2580. The impression material used to record the prepared areas on abutment teeth is______________?
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A. Low viscosity elastomeric impression material

B. None of the above

C. High viscosity elastomeric impression material

D. Medium viscosity elastomeric impression material