Physical Properties Mcqs
Q.1: Stress in defined as_______________?$
A. An applied load or force
B. A deformation resulting from an applied load,
C. An external force opposing an applied load*
D. An internal force opposing an applied load*
Q.2: The proportional limit is defined as______________?3
A. The maximum stress in a structure!
B. The minimum force required to cause a structure to break8
C. The maximum stress that can be induced without permanent deformationD
D. The maximum elongation under tension that can be measured before failureH
Q.3: Compressive stress is computed by dividing the external force by the_______________?T
A. Area of the test specimen upon which the weight rests5
B. Elasticity of the test specimen in strain)
C. Length of the test specimen beneath the force-
D. Strain of the test specimen per unit length+
Q.4: The point at which a stress of a material exhibits a specific limited deviation P is called_______________?k
A. Proportional limit
B. Tensile strength
C. Ultimate strength
D. Yield strength
Q.5: Ability of an orthodontic wire to spring back to its original shape is evaluated by_____________?a
A. Brittleness
B. Resilience
C. Tensile strength
D. Toughness
Q.6: Ultimate tensile strength refers to_________________?5
A. Stress before rupture
B. Stress after rupture
C. Longitudinal compressive strength!
D. Horizontal compressive strength
Q.7: Property of the material, which describes the resistance to abrasion, is_________________?Z
A. Hardness
B. Yield strength
C. Modulus of elasticity
D. None of the above
Q.8: Which of the following physical property can be used to estimate indirectly the proportional limit of gold alloys ?s
A. Vickerss hardness number
B. Knoop hardness number
C. Brinell hardness number
D. Rockwell hardness number
Q.9: The ability of an alloy to withstand mechanical stresses without permanent deformation is reflected by its______________?y
A. Resilience
B. Elastic limit / Elastic strain
C. Hardness
D. Fatigue resistance
Q.10: The ability of the base to resist occlusal forces and to support the restoration is affected by_______________?o
A. Compressive strength
B. Tensile strength
C. Youngs modulus
D. Modulus of elasticity

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