medical MCQs – Page 126

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 Review each marked answer and report any item that may be outdated or unclear.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

2501. Inorganic phase of the composites aid in_______________?
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A. Increasing the mechanical strength

B. All of the above

C. Decreasing the coefficient of thermal expansion

D. Reducing the polymerization shrinkage

2502. The restoration which shows percolation and shrinkage along the margins is_____________?
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A. Unfilled resins

B. Composites

C. Polycarboxylate

D. Amalgam

2503. The Zinc oxide-eugenol impression pastes harden by________________?
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A. Cold

B. Heat

C. Pressure

D. Chemical reaction

2504. Polysulfide material is routinely not recommended because of_______________?
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A. Low accuracy

B. Unpleasant odor and taste

C. Least permanent deformation

D. Highest curing shrinkage

2505. Alginate impression material is similar to Agar-agar impression material in the following respect________________?
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A. Gelation increase in both on increase in temperature

B. Mixing time is increased to reduce the setting time

C. Deformation during removal of impression occurs due to distortion of gel fibers

D. Both can be re-used for fresh impressions

2506. 18-B Stainless steel orthodontic wire has_______________?
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A. 18% Carbon 8% Iron

B. 18% Chromium 8% Cobalt

C. 18% Nickel 8% Chrominum

D. 18% Chromium 8% Nickel

2507. Which of the following fuel gases is the best choice of heat source to carry out soldering process ?
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A. Hydrogen

B. Propane

C. Natural gas

D. Acetylene

2508. Which of the following cast gold alloys is used for fabricating partial denture frameworks______________?
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A. Type I Soft

B. Type III Hard

C. Type II Hard

D. Type IV Extra Hard

2509. In reversible hydrocolloid the property by which the transformation from sol to gel and gel to sol is a function of the_____________?
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A. Concentration of potassium sulphate

B. Temperature

C. Concentration of filler and plasticizer

D. Percentage composition by weight of water

2510. Corrosion of stainless steel is due to formulation of_________________?
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A. Carbon carbide

B. Chromium carbide

C. Nickel carbide

D. Iron carbide

2511. The cross linking agent of polysulphide rubber base impression material is______________?
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A. Platinum salt catalyst

B. Lead dioxide

C. Aromatic sulfonate esters

D. Stannous octate

2512. The role of magnesium chloride in zinc oxide eugenol impression paste_________________?
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A. Plasticier

B. Accelerator

C. Retarder

D. Modifier

2513. Impression compound has which of the following characteristic property ?
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A. Remain distortion free up to 72 hrs. pouring can be safely delayed

B. Degradation is presence of moisture

C. Low thermal conductivity

D. High flow property

2514. All of the following can be used to slow down the setting of Zinc oxide eugenol impression paste EXCEPT_________________?
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A. Adding a small amount of water

B. Adding a small amount of glycerine

C. Cooling mixing slab

D. Altering the amounts of the two pastes used

2515. Hydrocolloid material, show all except______________?
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A. Syneresis

B. Imbibition

C. Recrytallisation

D. Hysterisis

2516. In Base metal alloys, Corrosion resistance occurs due to___________________?
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A. High Molecular Weight

B. Passivity

C. High Fusion Temperature

D. Co-efficient of Thermal Expansion

2517. Gases dissolved in molten metals are liberated when cooled giving rise to________________?
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A. Gas inclusion porosity

B. Suckback porosity

C. Localized shrinkage porosity

D. Microporosity

2518. The rapid decrease in tensile strength and increase in ductility of a wrought metal is seen in which stage of annealing ?
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A. Recrystallisation stage

B. Grain growth stage

C. All of the above

D. Recovery stage

2519. The strength of the gypsum specimen when the water in excess of that required for the hydrate of the hemihydrate is left in the specimen is called____________?
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A. Green strength

B. Dry strength

C. Water strength

D. Compressive strength

2520. Which of the following is not true about elastomeric impression ?
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A. Putty wash technique of impression reduces dimensional change of setting

B. Improper mixing of material can cause permanent deformation of impression

C. Shear thinning is related to viscosity of non phase impression material

D. Single mix material have higher viscosity

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