medical MCQs – Page 431

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 Review each marked answer and report any item that may be outdated or unclear.

8601. With indirect spruing. Which one of the following porosities can be minimised_______________?
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A. Back pressure porosity

B. Micro porosity

C. Pin hole porosity

D. Localized shrinkage porosity
8602. Hysteresis in a hydrocolloid gel is______________?
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A. Phenomenon of conversion of gel into sol

B. Temperature lag between gelation and liquefaction temperature

C. Moisture absorption

D. All of the above

8603. The best pickling solution for gypsum bonded investment is_______________?
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A. Hydrochloric acid

B. Phosphoric acid

C. Sulphuric acid

D. Nitric acid

8604. Function of carnauba wax_________________?
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A. Increase toughness

B. To provide a smooth and glossy surface

C. Decrease toughness

D. Decrease flow at room temperature
8605. Crucible indicated for casting base metal alloys is______________?
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A. High melting plastic crucible

B. Clay crucible

C. Quartz crucible

D. Carbon crucible

8606. Stages of annealing in order_________________?
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A. Recrystallization recovery, grain growth

B. Grain Growth Recrystallization recovery

C. Recovery recrystallization grain growth

D. Melting point, grain growth, Recrystallization

8607. Linear coefficient of thermal expansion of metal used for metal caramic restoration range from________________?
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A. 11.5-12.510-6/C

B. 13.5-14.510-6/C

C. 10.5-11.510-6/C

D. 16.5-17.510-6/C

8608. The impression materials with lowest viscosity is_____________?
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A. Elastomers

B. Plaster of paris

C. Zinc oxide eugenol

D. Agar agar

8609. The relative hardness of elastomere is determined using________________?
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A. Knoop pyramid

B. Rockwell tester

C. Barcol indenter

D. Shore durometer
8610. Masterial causing minimum tissue distortion is______________?
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A. Impression plaster

B. Zinc oxide eugenol paster

C. Polysulphide

D. Silicone

8611. Wax pattern is ideally invested immediately to decrease the dimensional changes caused by_______________?
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A. Water loss

B. Decrease flow

C. Relaxation of the internal stresses

D. Continuous expansion

8612. The yield strength of AUstenite (NiTi alloy) is______________?
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A. 240 Mpa

B. 100 Mpa

C. 560 Mpa

D. 700 Mpa

8613. 4th state of matter is______________?
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A. Liquid

B. Solid

C. Gas

D. Colloid
8614. Which material is the most difficult to remove from the patients mouth ?
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A. Silicone impression material

B. Reversible hydrocolloid

C. Impression plaster

D. Metallic oxide paste
8615. Impression compound has which of the following characteristic property ?
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A. Degradation is presence of moisture

B. High flow property

C. Remain distortion free up to 72 hrs. pouring can be safely delayed

D. Low thermal conductivity
8616. When making a polysulphide impression for a caste crown, custom trays are usually preferred over stock trays for all of the following reasons except_______________?
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A. Custom trays facilitate uniform contraction of impression material

B. Custom trays require less impression material

C. Impressions made n the custom trays are easier to remove from the mouth

D. Stock trays may be short in the flange area

8617. As per DNA No. 25, minimum amount of setting expansion required for type V gypsum products_______________?
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A. 0.2

B. 0.15

C. 0.10

D. 0.05

8618. A common electrolyte used for plating copper indirect dies is_______________?
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A. Ionic copper

B. Acidic copper sulfate

C. Copper cynide

D. Silver cyanide

8619. Which of the following is not affected by saliva ?
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A. Impression paste

B. Silicon impression material

C. None of the above

D. Impression plaster

8620. Perforated impression tray are used for_______________?
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A. Zinc oxide-eugenol

B. Impression compound

C. Alginate

D. Agar-agar