medical MCQs – Page 132

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 Review each marked answer and report any item that may be outdated or unclear.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

2621. Impression material that Do NOT harden by chemical reaction_______________?
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A. Alginate

B. Plaster of paris

C. Impression compound

D. Zinc oxide eugenol

2622. Which of the following impression materials is easy to pour and difficult to remove the stone cast from the impression ?
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A. Polyether

B. Condensation polysilicone

C. Addition polysilicone

D. Polysulfide

2623. Which one of the following categories of dental materials has the highest thermal conductivity_________________?
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A. Unfilled acrylic plastics

B. Gold alloys

C. Zinc phosphate cements

D. Porcelains

2624. The best fuel gas when used with oxygen is______________?
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A. Propane

B. Acetylene

C. Hydrogen

D. Natural gas

2625. The deoxidizing agent added to dental alloys is______________?
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A. Palladium

B. Zinc

C. Silver

D. Copper

2626. Which of the following best describes the working time of elastomeric impression material ?
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A. Loss of luster of impression material

B. After the start of appearing elastic properties of impression material

C. Just before the start of appearing elastic properties of impression material

D. Just after the start of appearing elastic properties of impression material

2627. Incomplete casting is the result of_____________?
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A. More porous investment in the mould

B. Large reservoir

C. Hollow sprue pin

D. Narrow sprue diameter

2628. 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

2629. The main difference between dental stone and dental plaster is______________?
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A. Solubility in water

B. Sharpe and size of particles

C. Chemical composition

D. Self life

2630. Which of the following is correct regarding chemical setting of condensation silicone_______________?
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A. By condensation of repeated molecules of monomers

B. Polymerization occurs with elimination of single byproduct

C. Condensation does not occur at all

D. Polymerization occurs with repeated elimination of small molecules

2631. Dustless alginate is produced by______________?
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A. Altering the matrix

B. Reducing the diatomaceous earth

C. Coating with dihydric alcohol

D. Adding heavy metal salts

2632. Which of the following is function of fluoride flux in soldering process ?
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A. It prevents the formation of chromium oxide or dissolves chromic oxide layer

B. Increase the strength of solder

C. It prevents the flow of material in undesirable area

D. It prevents the formation of copper oxide

2633. The strength of gypsum prouducts is generally expressed in terms of______________?
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A. Green strength

B. Tensile strength

C. compressive strength

D. Wet strength

2634. Suck back porosity is due to_________________?
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A. Attached impurities on undersurface of casting

B. No rapid cooling

C. Hot spot

D. Inadequate melting temperature

2635. Heat hardening is the process done at_______________?
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A. Heating 750C and slowly cooling to zero degree

B. Heating quickly upto 450C followed by sudden quenching

C. Heating at 750C and then quenching to room temperature

D. Heating upto 250C for 15 to 30 min

2636. Crucible indicated for casting base metal alloys is______________?
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A. Carbon crucible

B. Quartz crucible

C. High melting plastic crucible

D. Clay crucible

2637. The setting expansion of gypsum products can be reduced by________________?
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A. Less water powder ratio

B. Adding potassium sulfate

C. Allowing setting under water

D. Increased spatulation

2638. Which of the following is correct glass transition temperature of Impression compound ?
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A. 39C

B. 43.5C

C. 65C

D. 100C

2639. Perforated impression tray are used for_______________?
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A. Zinc oxide-eugenol

B. Agar-agar

C. Alginate

D. Impression compound

2640. Stabilization of stainless steel is achieved by adding____________?
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A. Nickel

B. Chromium

C. Titanium

D. Carbon

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