medical MCQs – Page 420

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 Review each marked answer and report any item that may be outdated or unclear.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

8381. Which of the following physical property can be used to estimate indirectly the proportional limit of gold alloys ?
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A. Rockwell hardness number

B. Brinell hardness number

C. Knoop hardness number

D. Vickerss hardness number

8382. The wetting of an adherent surface by an adhesive is related to________________?
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A. Surface energy of the adherent

B. Surface texture of the adherent

C. Nature of the adherent that is crystalline or amorphous

D. Surface tension of the adherent

8383. Stainless steel orthodontic wire can be hardened by________________?
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A. Age hardening

B. Work hardening

C. Tempering

D. Precipitation hardening

8384. The strength of a gypsum investment is dependent on_______________?
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A. Copper

B. Carbon content

C. Silica content

D. Gypsum

8385. A thinner mix of a gypsum bonded investment will_______________?
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A. Produce a smoother casting

B. Increase thermal expansion

C. Decrease setting expansion

D. Increase setting expansion

8386. In a metal ceramic crown for a FPD the function of tin, indium which are readily oxidized minor constituents is to________________?
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A. Improve bonding

B. They react with the porcelain opaque layer, which masks the metal

C. Improves the thermal expansion between the metal and porcelain

D. Decrease porosity

8387. In measuring Vickers hardness no. Which of the following is used________________?
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A. Steel ball indentation

B. Rhomboid shaped indenter

C. Spherical indenter

D. 136-degree diamond pyramid

8388. A material which partially transmits light & partially scatters it________________?
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A. Reflector

B. Opaque

C. Translucent

D. Transparent

8389. Which of the following is an example of a composite material ?
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A. Wax

B. A filled resin

C. Gold alloy

D. Colloidal silica

8390. Quartz tungsten light cure device minimum output of energy should not be less than_____________?
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A. 450 mw/cm2

B. 300 mw/sm2

C. 350 mw/cm2

D. 400 mw/cm2

8391. The ability of the base to resist occlusal forces and to support the restoration is affected by_______________?
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A. Tensile strength

B. Youngs modulus

C. Compressive strength

D. Modulus of elasticity

8392. Which one of the following is used as filler in composite resins ?
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A. Silicates

B. Zinc particles

C. Quartz

D. Aluminium

8393. Hardness number which does not depend on the ductility of metal_____________?
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A. BHN

B. RHN

C. VHN

D. KNH

8394. Subsurface porosity is due to_____________?
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A. Packing past the dough stage

B. Thermal changes

C. Thickness of the resin

D. Lack of temperature

8395. The % of free monomer in a heat cured acrylic resin is_______________?
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A. 0.6% to 0.8%

B. 8% to 10%

C. 3% to 5%

D. 0.2% to 0.5%

8396. Which one of the following is used as filler in composite resins ?
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A. Aluminium

B. Silicates

C. Zinc particles

D. Quartz

8397. Munsell system is used to_________________?
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A. Evaluate brittleness of different alloys

B. Define and measure colour qualitatively

C. Measures different colours quantitatively

D. Define and measure physical properties of gold alloys

8398. Most advantageous indication of acid etching is______________?
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A. Decrease coefficient of thermal expansion

B. Decrease porosity in restorative material

C. Decrease micro leakage

D. Decrease polymerization shrinkage

8399. Which of the following may result if an excessive amount of monomer is incorporated into an acrylic resin mixture ?
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A. Low impact strength

B. Excessive shrinkage

C. Excessive expansion

D. Excessive brittleness

8400. Strain is defined as_____________?
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A. An external force opposing an applied load

B. A deformation resulting from an applied load

C. An applied load or force

D. An internal force opposing an applied load

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