medical MCQs – Page 135

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 Review each marked answer and report any item that may be outdated or unclear.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

2681. Casting flux is used to_______________?
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A. Prevent the oxidation of the metal during melting

B. Flaring the point of the sprue attachment

C. None of the above

D. increase the melting point of the flux

2682. Nickel-Titanium alloy has__________________?
0

A. low spring back

B. None of the above

C. Minimal spring back

D. Unreliable spring back

2683. 4th state of matter is______________?
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A. Liquid

B. Solid

C. Colloid

D. Gas

2684. Advantage of titanium over other base metal alloys_______________?
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A. Low strength

B. Low weight

C. Low melting point

D. Low cost

2685. To make the vinyl Polysiloxane hydrophilic the following is added_______________?
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A. Surfactant

B. Plasticizer

C. Water

D. Mineral oil

2686. With indirect spruing. Which one of the following porosities can be minimised_______________?
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A. Localized shrinkage porosity

B. Pin hole porosity

C. Back pressure porosity

D. Micro porosity

2687. Which of the following is correct arrangement of impression material regarding linear contraction in ascending order ?
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A. Addition silicone < polysulfide < Polyether < condensation silicone

B. Addition silicone < polyether < polysulfide < condensation silicone

C. condensation silicone < polysulfide < polyether < Addition silicone

D. condensation silicone < polyether < polysulfide < Addition silicone

2688. Which of the following impression material requires a hardener ?
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A. Elastomers

B. Alginate

C. Agar

D. Impression compound

2689. Type I gypsum product is also called_______________?
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A. Class II stone/Densite

B. Class I stone / Hydrocal

C. Impression plaster

D. Model plaster

2690. Type I and Type II zinc oxide impression paste differ with respect to_______________?
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A. Water content

B. Their hardness after setting

C. Eugenol content

D. Their use

2691. Rough and irregular surface produced on the impression is because of_______________?
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A. Air incorporated during mixing

B. Due to improper ratio of polymer and monomer

C. Improper application of pressure during impression making

D. Presence of excessive saliva in impression area

2692. A common electrolyte used for plating copper indirect dies is_______________?
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A. Copper cynide

B. Silver cyanide

C. Ionic copper

D. Acidic copper sulfate

2693. Most rigid elastomer is___________________?
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A. Polysulphide

B. Polyether

C. Condensation silicone

D. Addition silicone

2694. A laminate impression technique utilizes_______________?
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A. Syringe agar and impression compound

B. Syringe agar and chilled tray alginate

C. Chilled alginate and impression compound

D. Syringe agar and tray agar

2695. Stainless steel is used mostly in dentistry_________________?
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A. To construct clasps for partial dentures

B. In orthodontic wires

C. To replace internal gold restorations

D. To strength amalgam

2696. Syneresis seen in hydrocolloid gel is______________?
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A. Shrinkage

B. Gelation

C. Water absorption

D. Seen as water loss

2697. Syneresis is associated with______________?
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A. Plaster of paris

B. Hydrocolloids

C. Zinc oxide eugenol

D. Elastomers

2698. Elastomers are_________________?
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A. Agar

B. Polyethers

C. Imp. Compound

D. Alginate

2699. Which of the following is true about Agar hydrocolloid impression material ?
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A. Cannot register fine surface details

B. Solidfies between 50 70C

C. Facilitates fabrication of metal dyes

D. Liquefies between 71 100C

2700. Type III Dental gypsum is__________________?
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A. Model or lab plaster

B. Densite

C. Class II stone

D. Class I stone or hydrocal

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