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


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


cModulus of elasticity


dModulus of resilience


View Answer Tensile strength

When solid gets wet completely contact angle is______________?


a90°


b


c0°-90°


d>90°


View Answer

Modulus of elasticity means_______________?


aRigidity or stiffness of the material


bAbility to be stretched with permanent deformation


cDuctility of the material


dMalleability of the metal



Sublimation is the conversion of a___________________?


aSolid directly to gas


bGas to liquid and then to soild


cGas directly to liquid


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


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


dFlow


View Answer Modulus of elasticity

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


aGold alloy


bAcrylic resin


cSilicate cement


dGold foil


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


cSurface tension of the adherent


dNature of the adherent that is crystalline or amorphous



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