Question: Non metal which conducts elactricity______________?

• 1. Graphite
• 2. Carbon
• 3. Acrylic
• 4. Porcelain

Question: Etching of dentin does not include_____________?

• 1. Removal of smear layer
• 2. Exposure of collagen fibers
• 3. Opening of dentinal tubules
• 4. Increases surface energy

Question: The Knoop Hardness Number of Microfilled composite Restorative material ranges from____________?

• 1. 50 – 60 KHN
• 2. 25 – 35 KHN
• 3. 15 – 20 KHN
• 4. 40 – 48 KHN

Question: The elastic of plastic deformation to fracture a material is its_______________?

• 1. Toughness
• 2. Brittleness
• 3. Young’s modulus
• 4. Proportional limit

Question: KHN of enamel is close to______________?

• 1. Pure gold
• 2. Amalgam
• 3. Prcelain
• 4. Composite

Question: Which one of the following is the result of applying a load to a wire below its modulus of elasticity on a load deflection diagram ?

• 1. Fracture of the wire
• 2. permanent deformation
• 3. Spring back
• 4. Increase in stiffness

Question: A fluid having constant viscosity that does not depend upon the strain rate is said to be_______________?

• 1. Viscoelastic
• 2. Pseudoplastic
• 3. Plastic
• 4. Newtonian

Question: Which of the following hardness test is a micro hardness test ?

• 1. Brinnel
• 2. Knoop
• 3. Shore-A
• 4. Rockwell

Question: Which of the following properties of dental materials is time dependent_______________?

• 1. Creep
• 2. Resillience
• 3. Elastic limit
• 4. Ultimate strength

Question: Flow of a material refers to_______________?

• 1. Continued change of the material under a given load
• 2. The consistency of material when mixing
• 3. The homogencity of gypsum products
• 4. Dimensional change of the material during settings