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.Management Sciences
Category: Physical Properties
Etching of dentin does not include_____________?
A. Removal of smear layer
B. Exposure of collagen fibers
C. Opening of dentinal tubules
D. Increases surface energy
A material behaves in certain ways above and below the proportional limit on a stress strin curve, which of the following is correct______________?
A. Above the proportional limit a material function in a plastic manner, while below the proportional limit it behaves as an elastic
B. Above the proportional limit a material functions in an elastic manner, while below the proportional limit it behaves as an plastic
C. Either A or B
D. Neither A or B
Compressive stress is computed by dividing the external force by the_______________?
A. Area of the test specimen upon which the weight rests
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
Ability of an orthodontic wire to spring back to its original shape is evaluated by_____________?
A. Brittleness
B. Resilience
C. Tensile strength
D. Toughness
The point at which a stress of a material exhibits a specific limited deviation P is called_______________?
A. Proportional limit
B. Tensile strength
C. Ultimate strength
D. Yield strength
Ultimate tensile strength refers to_________________?
A. Stress before rupture
B. Stress after rupture
C. Longitudinal compressive strength
D. Horizontal compressive strength
A material which partially transmits light & partially scatters it________________?
A. Reflector
B. Translucent
C. Transparent
D. Opaque
The ability of an alloy to withstand mechanical stresses without permanent deformation is reflected by its______________?
A. Resilience
B. Elastic limit / Elastic strain
C. Hardness
D. Fatigue resistance
Deformation that is recovered upon removal of an externally applied force or pressure is known as_____________?
A. Young’s modulus
B. Plastic strain
C. Elastic strain
D. Flexural strain
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