medical MCQs – Page 139

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 Review each marked answer and report any item that may be outdated or unclear.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

2761. What is the working time of zinc polyacrylate cement ?
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A. 3 Minutes

B. 1 Minutes

C. 4 Minutes

D. 2 Minutes

2762. A purine which is found in saliva is_______________?
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A. Thymine

B. Uric acid

C. Adenosine

D. Hypolithinium

2763. Well premeasured capsules of amalgam can release mercury vapour during_______________?
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A. Mulling

B. Trituration

C. Condensation

D. Carving

2764. Porcelain denture teeth________________?
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A. Should be used where the inter dental clearance is small

B. Have a lower abrasion resistance than enamel

C. Have a higher abrasion resistance than gold

D. Have a higher coefficient of thermal expansion than acrylic teeth:

2765. Which of the following cements is most irritant to pulpal tissues ?
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A. Silicate

B. Polycarboxylate

C. Glass ionomer

D. Zinc phosphate

2766. Accelerators and retarders are used with gypsum products mainly to control_______________?
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A. Setting expansion

B. Setting time

C. None of the above

D. Hardness of the set product

2767. The preferred material for repair of fractured denture base is______________?
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A. Chemically cure resin

B. Light cure resin

C. Vinyl resin

D. Heat curve resin

2768. Which of the following is not correct?
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A. Free denticles are entirely surrounded by pulp tissue(free of dentin)

B. False denticles contains many dentinal tubules

C. Attached denticles are partly fused with dentin

D. Embedded denticles are entirely surrounded by dentin (embedded in dentin)

2769. Phenomenon in which porcelain appears different under varying light condition is______________?
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A. Refractive optics

B. Metamerism

C. Translucency

D. Opacification

2770. Which one of the following dental cements does not contain water as part of the composition of the liquid component ?
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A. Zinc oxide equgenol cement

B. Zinc polycarboxylate cement

C. Zinc silicophosphate cement

D. Zinc Phosphate cement

2771. Condensation shrinkage of porcelain during firing depends on__________________?
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A. Shape and size of particle

B. Type of investment used

C. Uniformity of particle size

D. Rate of arriving at firing temperature

2772. The highest mercury concentration in amalgam filling is found_____________?
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A. None of the above

B. At the margin of the restoration

C. In the deepest part of the restoration

D. In the centre of the restoration

2773. All of the following statements are true for zinc oxide eugenol cements except______________?
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A. Equal lengths of base paste and accelerator paste are mixed together until the mix has a uniform colour

B. Increase in temperature and humidity shorten the setting time

C. The mix appear thick at the start of mixing but after 30 seconds of additional spatulation it becomes more fluid

D. Water accelerates but heat retards the setting of zinc oxide eugenol cements

E. Both C & D

2774. The term trituration means____________?
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A. None of the above

B. Lysing amalgam alloy

C. Removal of excess of mercury

D. Mixing of amalgam alloy and mercury

2775. Which of the following cements is most biocompatible with pulp ?
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A. Zinc oxide eugenol cement

B. Zinc phosphate cement

C. GIC

D. Copper cement

2776. The ? (Beta) hemihydrate of gypsum requires more water to float its powder particles because______________?
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A. They are more regular in shape and dense

B. They are more regular in shape and highly porous

C. They are more irregular in shape and porous

D. They are more dense and prismatic in shape

2777. Chemical tempering in porcelains is done to interrupt crack propagation by______________?
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A. Transformation toughening

B. All of the above

C. Dispersion of crystalline phase

D. Inducing residual compressive strength

2778. Why GIC is best restorative material in children_____________?
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A. It can bond enamel & dentin

B. It has less occlusal wear

C. High strength

D. Good marginal integrity

2779. Moisture contamination of amalgam can lead to_____________?
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A. Delayed expansion

B. Shrinkage

C. increased stresses

D. Marginal breakdown

2780. Cavity varnishes have_____________?
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A. Average bonding to tooth

B. Excellent bonding to tooth

C. No bonding to tooth

D. Low bonding to tooth

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