medical MCQs – Page 130

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 Review each marked answer and report any item that may be outdated or unclear.

2581. Dimensional stability of elastomeric impression material can be given in descending order as_____________?
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A. Addition silicone> Condensation silicone > Polysulphide > polyether

B. Polysulphide > polyether > Condensation silicone > Addition silicone

C. polyether > Condensation silicone > Polysulphide > Addition silicone

D. Addition silicone > polyether > Polysulphide > Condensation silicone
2582. Localised shrinkage porosity is seen when there________________?
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A. Thin sprue

B. No reservoir

C. Investment heated strongly

D. Inadequate air discharge

2583. Which zone is the hottest and efficient burning zone of the flame used for casting ?
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A. Reducing zone

B. Oxidizing zone

C. None of the above

D. Combustion zone

2584. Best material for duplicating cast is_______________?
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A. Agar-agar

B. Zinc oxide eugenol

C. Plaster of paris

D. Alginate

2585. K2SO4 in agar-agar is for_______________?
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A. Give dimensional stability

B. Accelerating the setting stage of gypsum

C. Increase strength

D. None of the above

2586. A technique of combining reversible and irreversible hydrocolloid that could bond to irreversible hydrocolloid is known as________________?
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A. Tempering technique

B. Immersion technique

C. Laminate technique

D. Injecting technique

2587. Alginates are made dust free by adding______________?
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A. Glycol

B. Glutamic acid

C. alcohol

D. Glyecrol
2588. The sprue in wax pattern should be placed________________?
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A. At obtuse angle

B. At right angle

C. At 45C angle

D. It depend upon type of wax pattern

2589. Hysteresis in a hydrocolloid gel is______________?
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A. All of the above

B. Temperature lag between gelation and liquefaction temperature

C. Moisture absorption

D. Phenomenon of conversion of gel into sol

2590. Linear coefficient of thermal expansion of metal used for metal caramic restoration range from________________?
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A. 16.5-17.510-6/C

B. 10.5-11.510-6/C

C. 13.5-14.510-6/C

D. 11.5-12.510-6/C

2591. Brush heap structure is found in______________?
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A. Agar

B. Polyether

C. Condensation silicone

D. Zinc oxide impression material

2592. Inlay wax is used to_______________?
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A. Invest inlay patterns

B. Make inlay wax patterns

C. Box models

D. Temporarily cement inlays:

2593. By product of condensation reaction between silicone base and alkyl silicate in presence of tin octate_______________?
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A. Propanolol

B. Acetate

C. Ethyl alcohol

D. Glycol

2594. Nickel is added to wrought gold alloys as______________?
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A. Scavenger

B. Hardener

C. Whitens the alloy

D. Strengtherner
2595. The relative hardness of elastomere is determined using________________?
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A. Rockwell tester

B. Shore durometer

C. Barcol indenter

D. Knoop pyramid

2596. Mouth temperature waxes are_______________?
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A. None of the above

B. Green stick wax

C. Modeling wax

D. Iowa wax
2597. The purity of gold is expressed in________________?
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A. Gram

B. Percentage

C. Fineness

D. Carats

2598. Gelation temparature of agar is between________________?
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A. 27C to 33C

B. 55C to 60C

C. 20C to 25C

D. 37C to 50C
2599. Rinsing of the impression is important to________________?
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A. Remove excess impression material

B. Accelerate the setting

C. Hydrate the impression

D. Remove saliva
2600. Which of the following is used as surface hardener in Impression material ?
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A. 2% Potassium sulfate

B. 0.2% Potassium sulfate

C. 4% Potassium sulfate

D. 2% sodium sulfate