731.Which are the following property can be used to estimate indirectly the proportionallimit of gold alloys
A.Vickers hardness number
B.Knoop hardness number
C.Brenell hardness number
D.Rockwell hardness number

732.Etching of dentine does not include
A.Removal of smear layer
B.Exposure of collagen fibers
C.Opening of dentinal tubules
D.Increase of surface energy

733.Key principles that determines the adverse effects of dental materials
A.Metal corrosion
B.Material degradation
C.Surface characters
D.All the above

734.For proper adhesion, the distance between surface molecules should not be greater than
A.0.007 μm
B.0.0007 μm
C.0.07 μm
D.0.7 μm

735.Amount of energy absorbed by the structure when it is stressed not to exceed the proportionality limit is
A.Modulus of elasticity
B.Flexibility
C.Resilience
D.Toughness

736.Hardness of rubber and plastics is measured from
A.Vicker hardness test
B.Rockwell hardness test
C.Brinnel hardness test
D.Shore A &Barcol test

737.If a materials viscosity decreases with increase in shear rate, it is said to exhibit
A.Newtonian
B.Thixotropic
C.Dilantant
D.Psuedoplastic

738. Time dependant plastic deformation is called
A.Viscosity
B.Creep
C.Resilience
D.Toughness

739.Ability of a material to withstand permanent deformation under compression is called
A.Ductility
B.Malleability
C.Hardness
D.Toughness

740.Following is called as gold standard test
A.Invitro test
B.Invivo test
C.Animal test
D.Human trails

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