501.In Gypsum bonded investment,composition of alpha hemihydrate is

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%

499.A diamond in the shape of square based pyramid is used in

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

Ans-b.Vicker hardness test

452.Which cement has high solubility and disintegrates readily in oral fluids

a.Silicates

b.GIC

c.Zinc Polycarboxylate

d.Zinc phosphate cement

Ans-a.Silicates

451.The first porcelain tooth material was introuced by

a.Dechemant
b.Ash
c.Plateau
d.McClean

Ans-a.Dechemant
Ref-Phillips 11nth ed pg 660

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

444.Which of the following has highest modulus of elasticity

a.Dentin
b.Enamel
c.Amalgam
d.Composite resin






Ans-b.Enamel

443.In a cobalt chromium alloy the metal responsible for corrosion resistance is

a.Silver
b.Nickel
c.Cobalt
D.Chromium


Ans-d.Chromium

325.Average mercury content in well condensed amalgam should not exceed

a.30%
b.40%
c.50%
d.60%
Ans-c .50%
refer phillips 11nth ed pg 552

319.Which type of lamp emits light at a single wavelength

a.ARGON LASER LAMPS
b.LED LAMPS
c.QTH LAMPS
d.PAC LAMPS

318.Melting point of titanium

a.1555degree centigrade
b.1668 degree centigrade
c.2225 degree centigrade
d.1200 degree centigrade

Ans-b.1668 degree centigrade

ref phillips 11nth ed pg 579

221. Which of the following statement is correct regarding chemical setting of condensation silicone?

a)   Polymerization occurs with repeated elimination of small molecules

b)   Polymerization occurs with elimination of  single byproduct

c)   It occurs by repeated condensation of molecules of monomers

d)   Condensation does not occur at all   ( AIPG 2010  ) (Repeat: AIPG 2007)    \

41.Recommended size of sprue for wax pattern crowns is:

a. Guaze 8 to 10. b. 10 to 12
c. 10 to 14. d. 12 to 16.

Ans:c ref Skinner’s 10th -496


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38.The largest sized pororsity is:

1. Micro porosity. 2. Pin hole porosity.
3. Suck back porosity 4. Gas inclusion porosity

ANS.3 ref Skinner’s 10th -518


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37.The minimum percentage of binder that should be present in the gypsum bonded investment is:

1. 10%. 2. 25%.
3. 50%. 4. 75%.


ANS.2 REF Skinner’s 10th -472

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25. The average force required to condense gold with a condenser point of 1mm diameter is

a. 10 pounds. b. 15 pounds.
c. 20 pounds. d. 25 pounds.
Ans. B.

A force of 15 pounds in considered optimal and is well within the physiologic limits of the tooth. Forces of magnitude 3.75 pounds are recommended for condenser nibs of 0.5 mm diameter, 8.43 pounds for 0.75 mm diameter and 15 pounds for 1mm diameter nibs.

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13.Which has potential 2 turn into malignant melanoma?

a). junctional nevus b). compound nevus
c). intradermal nevus d). blue nevus


Ans. A
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11. Fluoromica glass ceramic is the other name for

a. Castable dental ceramic b. Leucite (KAlSi2O6)
c. aluminous glass core d. Lithium disilicate
_______________________________________
Ans. A. The first commercially available castable dental ceramic was Dicor. The mica crystals formed in Dicor are based on the composition SiO2 · K2O · MgO · Al2O3 · ZrO2. and fluorides are added to the mixture to help produce a degree of fluorescence in the finished prosthesis. For this reason, this formulation is called a fluoromica glass ceramic. A wax pattern is fabricated by a lab technician, just as it would be done for a gold casting. An ingot of the castable ceramic is placed in a special crucible, melted, and centrifugally cast at a temperature of 1380°C.


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