Question: The ability of the base to resist occlusal forces and to support the restoration is affected by_______________?

• 1. Compressive strength
• 2. Tensile strength
• 3. Young’s modulus
• 4. Modulus of elasticity

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

• 1. Resilience
• 2. Elastic limit / Elastic strain
• 3. Hardness
• 4. Fatigue resistance

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

• 1. Vickers’s hardness number
• 2. Knoop hardness number
• 3. Brinell hardness number
• 4. Rockwell hardness number

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

• 1. Hardness
• 2. Yield strength
• 3. Modulus of elasticity
• 4. None of the above

Question: Ultimate tensile strength refers to_________________?

• 1. Stress before rupture
• 2. Stress after rupture
• 3. Longitudinal compressive strength
• 4. Horizontal compressive strength

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

• 1. Brittleness
• 2. Resilience
• 3. Tensile strength
• 4. Toughness

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

• 1. Proportional limit
• 2. Tensile strength
• 3. Ultimate strength
• 4. Yield strength

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

• 1. Area of the test specimen upon which the weight rests
• 2. Elasticity of the test specimen in strain
• 3. Length of the test specimen beneath the force
• 4. Strain of the test specimen per unit length

Question: The proportional limit is defined as______________?

• 1. The maximum stress in a structure
• 2. The minimum force required to cause a structure to break
• 3. The maximum stress that can be induced without permanent deformation
• 4. The maximum elongation under tension that can be measured before failure

Question: Stress in defined as_______________?

• 1. An applied load or force
• 2. A deformation resulting from an applied load
• 3. An external force opposing an applied load
• 4. An internal force opposing an applied load