dental materials MCQs – Page 3

Practise focused dental materials questions with marked answers for exam preparation and subject revision.

dental materials Mcqs

41. 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

42. 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

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

B. Work hardening

C. Tempering

D. Precipitation hardening

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

B. Carbon content

C. Silica content

D. Gypsum

45. 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

46. 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

47. 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

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

B. Opaque

C. Translucent

D. Transparent

49. 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

50. 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

51. 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

52. 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

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

B. RHN

C. VHN

D. KNH

54. 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

55. 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%

56. 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

57. 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

58. 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

59. 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

60. 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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