451.The first porcelain tooth material was introuced by

a.Dechemant
b.Ash
c.Plateau
d.McClean

Ans-a.Dechemant
Ref-Phillips 11nth ed pg 660

450.In Penicillin allergy,Penicillin acts as a

a.Hapten
b.Carrier
c.Superantigen
d.Toxin

Ans-a.Hapten

449.If rate of loading is decreased,the mechanical properties of the material

a.Increases
b.Decreases
c.Constant
d.Become unpredictable

Ans-b.Decreases  Ref Sturdevant 4th ed pg 142