Dental Materials MCQs

Page No. 49

Setting expansion is advantageous in__________________?


aCasts

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bModel

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cInvestment

✓


dDies

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View Answer Investment

Stress in defined as_______________?


aAn applied load or force

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bA deformation resulting from an applied load

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cAn external force opposing an applied load

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dAn internal force opposing an applied load

✓



The proportional limit is defined as______________?


aThe maximum stress in a structure

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bThe minimum force required to cause a structure to break

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cThe maximum stress that can be induced without permanent deformation

✓


dThe maximum elongation under tension that can be measured before failure

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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

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cLength of the test specimen beneath the force

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dStrain of the test specimen per unit length

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


aProportional limit

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bTensile strength

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cUltimate strength

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dYield strength

✓


View Answer Yield strength

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


aBrittleness

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bResilience

✓


cTensile strength

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dToughness

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View Answer Resilience

Ultimate tensile strength refers to_________________?


aStress before rupture

✓


bStress after rupture

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cLongitudinal compressive strength

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dHorizontal compressive strength

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View Answer Stress before rupture

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


aHardness

✓


bYield strength

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cModulus of elasticity

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dNone of the above

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View Answer Hardness

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


aKnoop hardness number

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bBrinell hardness number

✓


cVicker's hardness number

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dRockwell hardness number

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


aResilience

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bElastic limit / Elastic strain

✓


cHardness

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dFatigue resistance

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