medical MCQs – Page 434

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 Review each marked answer and report any item that may be outdated or unclear.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

8661. Shape memory is seen in________________?
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A. Aluminium

B. NITTINOL wire

C. Stainless steel wire

D. TMA wire

8662. Which of the following refractory is used to counteract most of the expansion________________?
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A. Quartz

B. Corundum

C. Tridymite

D. Cristobalite

8663. In plaster of paris the setting time is primarily altered by_________________?
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A. Speed and length of hand spatulation

B. Altering P / L Ratio

C. Altering temperature of mixing water

D. Addition of accelerators and retarders

8664. A technique of combining reversible and irreversible hydrocolloid that could bond to irreversible hydrocolloid is known as________________?
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A. Immersion technique

B. Laminate technique

C. Tempering technique

D. Injecting technique

8665. A rough / Chalky surface of the cast is due to_______________?
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A. Not waiting for 20 min before pouring

B. Air incorporation in the mix

C. All of the above

D. High speed accelerator

8666. Heavy and light body impression materials are use with______________?
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A. Reversible hydrocolloid

B. Silicone

C. A and B

D. Mercaptan

8667. Agar impression materials differ from alginate impression materials in that the former sets by_______________?
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A. Mechanical action of saliva

B. Evolution

C. Physical change

D. Chemical change

8668. The deoxidizing agent added to dental alloys is______________?
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A. Silver

B. Copper

C. Palladium

D. Zinc

8669. Balanced stone is dental stone_______________?
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A. In which accelerators or retarders have been added according to need

B. In which the crystals are all of uniform size

C. Which undergoes rapid expansion

D. In which amount of water of hydration is controlled

8670. Which one of the following elements is NOT added is small amount to be used as grain refiners ?
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A. Platinum

B. Iridium

C. strong>

D. Ruthinium

8671. Air bubbles formed on the surface of casting is probably due to________________?
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A. Improper casting pressure

B. Improper heating of the investment

C. Improper angulation of sprue

D. Improper wetting of the wax pattern by the investment

8672. Which of the waxes are derived from the lignite_________________?
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A. Inlay wax

B. Montan wax

C. Paraffin wax

D. Microcrystalline wax

8673. Casting flux is used to_______________?
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A. increase the melting point of the flux

B. Flaring the point of the sprue attachment

C. None of the above

D. Prevent the oxidation of the metal during melting

8674. The plasticizers used in polyether impression material is_______________?
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A. polyether polymer

B. Colloidal silica

C. Glycol ether

D. Di-vinyl poly (dimethyl siloxane)

8675. The maximum carbon content of steel used in dentistry is__________________?
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A. 19%

B. 1.7%

C. 2%

D. 4%

8676. Mechanical properties of Cp Titanium are similar to alloys_____________?
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A. Type VII and type VIII gold

B. None of the above

C. Type III and Type IV gold

D. Type V and type VI gold

8677. ADA specification number of gypsum products are described under____________?
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A. 25

B. 4

C. 12

D. 1

8678. Retarder in Zinc oxide eugenol is______________?
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A. Alcohol

B. CaCl2

C. Zinc acetate

D. Glycerine

8679. A laminate impression technique utilizes_______________?
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A. Syringe agar and tray agar

B. Syringe agar and chilled tray alginate

C. Syringe agar and impression compound

D. Chilled alginate and impression compound

8680. Passivating alloys are_______________?
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A. Cr, Gold, Ti

B. Cr, Fe, Ti

C. Cr, Al, Ti

D. Cr, Mo, Ti

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