a.It can always be seen in routine intraoral radiographs.
b.Can be observed in demineralized histological sections
c.It is initially  termed as secondary dentine
d.Starts when the lesion starts in enamel carious lesions

Ans-b.Can be observed in demineralized histological sections

a.Posterior inferior cerebellar artery
b.Anterior inferior cerebellar artery
c.posterior cerebral artery
d.spinal artery

Ans-a.Posterior inferior cerebellar artery

a.60-65%
b.30-35%
c.5-10%
d.85-90%

Ans-b.30-35%
Explanation-Composition of gypsum bonded investment is 
Silica-60-65%
Alpha hemihydrate-30-35%
Modifiers-5%

a.WT -1
b.PTEN
c.NF-2
d.RAS

Ans-d.RAS

a.Knoop hardness test
b.Vicker hardness test
c.Shore and Barcol test
d.Rock well hardness test

Ans-b.Vicker hardness test

a.Pfeieffer disease
b.Kissing disease
c.Both a and b
d.None


Ans-C.Both a and b Refer shafers 5th ed pg 1065