216.The minimum depth of a detectable carious lesion on a radiograph is

a.500 micrometer
b.1000 micrometer
c.5000 micrometer
d.8000 micrometer

Ans:a.500 micrometer

Explanation:Ref sturdevant 4th ed pg102

215.The greatest concentration of phosphate in tooth is in the

a.Pulp
b.Enamel
c.Dentin
d.Cementum

Ans:b.Enamel

214.Cross resistance of isoniazid is not seen with

a.Rifampicin
b.Ethionamide
c.Cyclosporine
d.Ethambutol

Ans:b.Ethionamide


Explanation:Ref katzung 10/ed pg 772