241.For how long EDTA remains active within the root canal if not inactivated?

a.5days
b.8days
c.10days
d.15days

Ans-5 days

240.Ruddles'solution contains

a.5%NaOCl&H2o2
b.5%NaOCl,Ca(oH)2& 17%EDTA
c.5%NaOCl,Hypaque& 17%EDTA
d.17%EDTA,Urea peroxide&Propylene glycol

Ans-c.5%NaOCl,Hypaque& 17%EDTA

239.All are true for home bleaching,except

a.Uses 15%carbamide peroxide
b.In addition to bleaching agent carbapol is used
c.Vacuum from vinyl trays are used
d.Both arches bleached simultaneously


Ans-d.Both arches bleached simultaneously

Explanation-sturdvent 4th ed pg 610-612
It is recommended that only one arch be bleached at a time, beginning with maxillary arch.bleaching the maxillary arch first allows theuntreated mandibular arch to serve as a comparison.

238.Which one of the following anaesthetic agents causes a rise in the intracranial pressure?

a.Sevoflurane
b.Thiopentone sodium
c.Lignocaine
d.Propofol

Ans-a.Sevoflorane

Explanation-Intracranial pressure increases at high inspired concentrations of Sevoflorane.Ref Aitkinhead 4th/159

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237.The blood brain barrier is present in all except

a.Postrema area
b.Subfornical organ
c.Neurohypophysis
d.Habernacular trigone

Ans-d.Habernacular trigone


Explanation:Refer ganong's physiology 22ed pg 615
Remember SONA OR SOAP Subfornical organ
Organum vasculosum
area postrema
posterior pituitary/neurohypophsis