383.The deviation of the apical foramen from the centre of root apex

a.0-0.2mm

b.0.2-0.5mm

c.0.5-1mm

d.1-2mm

Ans-b.0.2mm-0.5mm

382.Which of the following partially or completely disappears visually when the enamel is hydrated

a.Incipient caries
b.Hypocalcified enamel
c.Tetracycline stains
d.Flouride stains
Ans-a.Incipient caries

381.Resistance to torquing is produced by acheiving

a.Buccal hook

b.Truss effect

c.Lingual hook

d.Proximal hook

Ans-c.Lingul hook