medical MCQs – Page 432

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 Review each marked answer and report any item that may be outdated or unclear.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

8621. The role of magnesium chloride in zinc oxide eugenol impression paste_________________?
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A. Retarder

B. Accelerator

C. Modifier

D. Plasticier

8622. Hypersensitivity reactions like contact dermatitis can be caused by______________?
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A. Polyether

B. Condensation silicones

C. polysulfides

D. addition silicones

8623. Which of the following is function of fluoride flux in soldering process ?
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A. Increase the strength of solder

B. It prevents the formation of chromium oxide or dissolves chromic oxide layer

C. It prevents the formation of copper oxide

D. It prevents the flow of material in undesirable area

8624. Which of the following is used as surface hardener in Impression material ?
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A. 2% Potassium sulfate

B. 2% sodium sulfate

C. 0.2% Potassium sulfate

D. 4% Potassium sulfate

8625. Component of inlay wax which makes it flake resistant is_____________?
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A. Canadelila

B. Carnauba

C. Gum dammar

D. Paraffin

8626. Polysulfide material is routinely not recommended because of_______________?
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A. Least permanent deformation

B. Unpleasant odor and taste

C. Low accuracy

D. Highest curing shrinkage

8627. The basic constituent of reversible hydrocolloid impression material is________________?
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A. Gelatin

B. alginate

C. Alginic acid

D. Agar

8628. The function of a sprue is to_______________?
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A. Help polish cast restorations

B. Reproduce fine detail

C. Form an opening of molten metal to enter the mold

D. Eliminate air bubbles on the wax pattern

8629. Which of the following fuel gases is the best choice of heat source to carry out soldering process ?
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A. Hydrogen

B. Natural gas

C. Acetylene

D. Propane

8630. Function of wetting agents used in casting procedure is_________________?
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A. To felicitate mixing investment

B. To felicitate wetting of ring liner

C. For better wax elimination

D. To reduce contact angle of liquid with max surface

8631. What is the minimum thickness of the elastomeric impression material for an accurate impression_______________?
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A. 2 mm

B. Maximum in the area of operation

C. Greater than 3 mm

D. 2-4 mm

8632. Two in one stage impression materials include______________?
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A. All of the above

B. Elastomeric impression material

C. Zinc Oxide eugenol impression paste

D. Hydrocolloid impression material

8633. Type III Dental gypsum is__________________?
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A. Model or lab plaster

B. Class I stone or hydrocal

C. Densite

D. Class II stone

8634. The rate of tarnish and corrosion of class II cast material having VHN 200 is_______________?
0

A. 5 to 10%

B. <1%

C. 2 to 3%

D. 0%

8635. Best impression material to be used for securing impression after crown preparation_______________?
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A. Agar

B. Elastome

C. Alginate

D. Zno paste

8636. Stainless steel is used mostly in dentistry_________________?
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A. To strength amalgam

B. To replace internal gold restorations

C. To construct clasps for partial dentures

D. In orthodontic wires

8637. Which of the following decrease with strain hardening______________?
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A. Surface hardness

B. Proportion limit

C. Strength

D. Corrosion resistance

8638. Which one of the following categories of dental materials has the highest thermal conductivity_________________?
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A. Gold alloys

B. Zinc phosphate cements

C. Porcelains

D. Unfilled acrylic plastics

8639. Before pouring an elastic impression it is washed with slurry of water and stone to______________?
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A. Prevent distortion

B. Prevent syneresis

C. Wash off saliva on impression

D. Increase gel strength

8640. Type I and Type II zinc oxide impression paste differ with respect to_______________?
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A. Eugenol content

B. Their hardness after setting

C. Their use

D. Water content

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