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

448.After doing proper etching ,what is the ideal depth of the microtags formed

a.0.5-5um
b.5-50um
c.50-500um
d.500-5000um


Ans-5-50um