Dental Materials MCQs

Page No. 49

Setting expansion is advantageous in__________________?


aCasts


bModel


cInvestment


dDies


View Answer Investment

Stress in defined as_______________?


aAn applied load or force


bA deformation resulting from an applied load


cAn external force opposing an applied load


dAn internal force opposing an applied load



The proportional limit is defined as______________?


aThe maximum stress in a structure


bThe minimum force required to cause a structure to break


cThe maximum stress that can be induced without permanent deformation


dThe maximum elongation under tension that can be measured before failure



Compressive stress is computed by dividing the external force by the_______________?


aArea of the test specimen upon which the weight rests


bElasticity of the test specimen in strain


cLength of the test specimen beneath the force


dStrain of the test specimen per unit length



The point at which a stress of a material exhibits a specific limited deviation P is called_______________?


aProportional limit


bTensile strength


cUltimate strength


dYield strength


View Answer Yield strength

Ability of an orthodontic wire to spring back to its original shape is evaluated by_____________?


aBrittleness


bResilience


cTensile strength


dToughness


View Answer Resilience

Ultimate tensile strength refers to_________________?


aStress before rupture


bStress after rupture


cLongitudinal compressive strength


dHorizontal compressive strength


View Answer Stress before rupture

Property of the material, which describes the resistance to abrasion, is_________________?


aHardness


bYield strength


cModulus of elasticity


dNone of the above


View Answer Hardness

Which of the following physical property can be used to estimate indirectly the proportional limit of gold alloys ?


aKnoop hardness number


bBrinell hardness number


cVicker's hardness number


dRockwell hardness number



The ability of an alloy to withstand mechanical stresses without permanent deformation is reflected by its______________?


aResilience


bElastic limit / Elastic strain


cHardness


dFatigue resistance



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