Dental Materials MCQs

Page No. 52

The greatest stress which may be produced in a material such that stress is directly proportional to the strain is know as_____________?


aThe elastic limit

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bThe proportional limit

✓


cThe yield strength

✖


dModulus of elasticity

✖



Hardness number which does not depend on the ductility of metal_____________?


aKNH

✓


bVHN

✖


cRHN

✖


dBHN

✖


View Answer KNH

Brinnel hardness number of a dental gold alloy is directly proportional to its______________?


aTensile strength

✓


bElongation

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cModulus of elasticity

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dModulus of resilience

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View Answer Tensile strength

When solid gets wet completely contact angle is______________?


a90°

✖


b0°

✓


c0°-90°

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d>90°

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View Answer 0°

Modulus of elasticity means_______________?


aRigidity or stiffness of the material

✓


bAbility to be stretched with permanent deformation

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cDuctility of the material

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dMalleability of the metal

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Sublimation is the conversion of a___________________?


aSolid directly to gas

✓


bGas to liquid and then to soild

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cGas directly to liquid

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dSolid to liquid and then to gas

✖


View Answer Solid directly to gas

Ductility of a material is a measure of it’s_______________?


aGrain elongation

✓


bAnealing

✖


cCold working

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dWork hardening

✖


View Answer Grain elongation

The stiffness of a dental gold alloy is determined by its________________?


aProportional limit

✖


bModulus of elasticity

✓


cUltimate tensile strength

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dFlow

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View Answer Modulus of elasticity

Coefficient of thermal expansion of which of following is most similar to that of tooth ?


aGold alloy

✖


bAcrylic resin

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cSilicate cement

✓


dGold foil

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View Answer Silicate cement

The wetting of an adherent surface by an adhesive is related to________________?


aSurface energy of the adherent

✓


bSurface texture of the adherent

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cSurface tension of the adherent

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dNature of the adherent that is crystalline or amorphous

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