medical MCQs – Page 127

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 Review each marked answer and report any item that may be outdated or unclear.

2521. Austenite is an alloy of iron of and carbon with the iron in______________?
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A. Gamma form

B. Alpha form

C. None of the above

D. Beta form

2522. The gold alloys used for casting contain at least. percent of precious metal according to ADA specification number 5________________?
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A. 55

B. 85

C. 65

D. 75
2523. Which of the following impression material is elastic________________?
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A. Zinc Oxide eugenol (ZOE) paste

B. Impression compound

C. Wax

D. Polyvinyl siloxane
2524. Apart from composites and ceramics, another material that could be copy milled easily and inexpensively is_________________?
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A. Titanium

B. Germanium

C. Molybdenum

D. Chromium

2525. The impression materials with lowest viscosity is_____________?
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A. Agar agar

B. Plaster of paris

C. Zinc oxide eugenol

D. Elastomers

2526. What is the minimum thickness of the elastomeric impression material for an accurate impression_______________?
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A. Maximum in the area of operation

B. 2 mm

C. 2-4 mm

D. Greater than 3 mm

2527. Immediate pouring of impressions is most critical in_____________?
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A. A and B

B. Polyether

C. Condensation polysillicon

D. Addition Polysilicon

2528. Impression techniques are used for recording________________?
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A. Dental hard tissues

B. None of the above

C. Oral mucosal tissues

D. Oral mucosal tissues and dental hard tissues
2529. Binder in phosphate bonded investment is______________?
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A. Magnesium oxide & Phosphoric acid

B. Magnesium oxide & Monoammonium phosphate

C. Magnesium oxide & Ortho Phosphoric acid

D. Magnesium oxide & Phosphate

2530. Component of inlay wax which makes it flake resistant is_____________?
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A. Gum dammar

B. Carnauba

C. Canadelila

D. Paraffin

2531. Impurities in casting is removed by________________?
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A. Pickling

B. Conditioning

C. Annealing

D. Degassing

2532. Hypersensitivity reactions like contact dermatitis can be caused by______________?
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A. addition silicones

B. polysulfides

C. Condensation silicones

D. Polyether
2533. Most mucostatic among the following_____________?
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A. Impression compound

B. ZOE paste

C. Elastomer

D. Alginate

2534. Shape memory in NiTi is because of stress induced form__________________?
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A. Ferrite to austenite

B. Austenite to ferrite

C. Martensite to austenite

D. Austenite to martensite
2535. The best pickling solution for gypsum bonded investment is_______________?
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A. Phosphoric acid

B. Nitric acid

C. Hydrochloric acid

D. Sulphuric acid

2536. Passivating alloys are_______________?
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A. Cr, Gold, Ti

B. Cr, Fe, Ti

C. Cr, Al, Ti

D. Cr, Mo, Ti

2537. During soldering, the solidus temperature of the filler material should be_____________?
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A. Temperature not relevant

B. Greater than the substrate material

C. Equal to the substrate material

D. Lesser than the substrate material
2538. A highly polished surface on a metallic dental restoration aids considerably in the prevention of the____________?
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A. Dimensional change

B. Tarnish and corrosion

C. Thermal conductivity

D. Warpage

2539. Which of the following best describes the working time of impression material ?
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A. Loss of lusture of impression material

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

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

D. The time for start of mixing till just before the start of appearing elastic properties of impression material
2540. Before pouring an elastic impression it is washed with slurry of water and stone to______________?
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A. Prevent syneresis

B. Prevent distortion

C. Wash off saliva on impression

D. Increase gel strength