medical MCQs – Page 136

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 Review each marked answer and report any item that may be outdated or unclear.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

2701. The castability of chromium-cobait base metal alloys when compared to gold based noble metal alloys is_______________?
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A. Less

B. Depends on the alloy type

C. More

D. Equal

2702. During setting of alginate impression materials________________?
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A. Trisodium phosphate reacts with calcium sulphate

B. Colloidal changes to sol

C. Trisodium phosphate reacts with sodium alginate

D. Material in contact with soft tissues sets last

2703. The function of 2% potassium sulphate in a gypsum product is_____________?
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A. To regulate the setting expansion

B. None

C. Regulate setting time

D. Acts as retarder

2704. Palatal secretions affect the setting of all the impression materials except_______________?
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A. Silicone

B. Impression paste

C. Impression plaster

D. Agar-agar

2705. Sol gel transformation is seen in________________?
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A. Impression compound

B. Elastomer

C. Hydrocolloids

D. Impression plaster

2706. All of the following statements about Type II silicon impression material are true EXCEPT_______________?
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A. They have a lower tear resistance than polysulphide rubbers

B. They exhibit a very low setting shrinkage

C. They set by condensation polymerisation

D. They evolve hydrogen when cast if they are not fully cured

2707. Wax pattern is ideally invested immediately to decrease the dimensional changes caused by_______________?
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A. Relaxation of the internal stresses

B. Water loss

C. Decrease flow

D. Continuous expansion

2708. Reduction in the fusion temperature of dental gold casting alloys is caused by presence of______________?
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A. Gold

B. Platinum

C. Copper

D. Silver

2709. Dendrites in cst alloys form by mechanism of_________________?
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A. Constitutional superconductivity

B. Constitutional supergriting

C. Constitutional supergraining

D. Constitutional supercooling

2710. The American dental association (ADA) specification number for non-aqueous elastomeric dental impression material is______________?
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A. 26

B. 21

C. 20

D. 19

2711. The term given to the phenomenon of moisture absorption by an alginate impression in________________?
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A. Hysteresis

B. Gelation

C. Syneresis

D. Imbibition

2712. Most biocompatible material in oral cavity is_______________?
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A. Platinium

B. Titanium

C. Palladium

D. Gold

2713. The basic constituent of reversible hydrocolloid impression material is________________?
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A. Alginic acid

B. alginate

C. Agar

D. Gelatin

2714. Which of the following fuel gases used for soldering, has the highest heat content______________?
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A. Propane

B. Hydrogen

C. Acetylene

D. Natural gas

2715. Silver plated dyes use an electrolytic bath of_______________?
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A. Silver fluorides

B. Silver cyanide

C. Silver iodide

D. Silver bromide

2716. Compared with noble metals, base metals show_______________?
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A. Increased ductility

B. Increased density

C. Increased hardness

D. Better biocompatibility

2717. Vulcanization refers to the setting of__________________?
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A. Zinc Phosphate cement

B. Zinc oxide-eugenol

C. Reversible hydrocolloid

D. Mercaptan impression material

2718. Most flexible impression material______________?
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A. Impression paste

B. Addition silicone

C. Impression compound

D. Alginate

2719. Rubber base impressions are poured immediately as they_______________?
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A. Continue to polymerize

B. Show imbibition and syneresis

C. Show gelation

D. Become elastic

2720. Microstructure of cobalt chromium alloy in cast condition is______________?
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A. amorphous

B. Inhomogenous

C. Fibrous

D. Homogeneous

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