1. Effects associated with cold working i.e lowered ductility and distorted grains can be eliminated by process known asAnnealingStrain hardeningEutecticConcentricityQuestion 1 of 20 2. the difference between heat cured and cold cured acrylic resin is least significant with respect to the property ofhardnesstransverse strengthcolor stabilityinternal porosityQuestion 2 of 20 3. Which of the following is true statements regarding the polishing of amalgam?it prevents tarnishing of the restorationocclusion should not be checked prior to polishingit should be done with a dry polishing powderit should be done about 10 minutes after placementQuestion 3 of 20 4. condensation shrinkage during porcelain firing is determined bytype of investment usedrate of firingsize and shape of particleuniform distriution of particle sizeQuestion 4 of 20 5. In mixing dental stone, why should the powder be sprinkled onto the water in the bowl?this process results in better powder mixing and reduced chance for air bubblesthe addition of powder prevents the mix from becoming exothermicthis is not recommended; the water should be added to the powderthe powder is added to the water to avoid using more than one bowlQuestion 5 of 20 6. Beta hemihydrate is calcinated byDehydrated in a boiling solution of 30% calcium chlorideIn absence of airIn presence of airUnder steam pressure in autoclaveQuestion 6 of 20 7. Copper content of single composition alloys13-30%9-20%30-40%0-6%Question 7 of 20 8. A thin application of cavity varnish over the cut surface of a prepared tooth just prior to the cementation of a crown or a bridge with zinc phosphate cement willinsulate the tooth against thermal changeincrease the possibility of thermal sensitivity.reduce the possibility of irritation of the pulpimpede the seating of the restoration.Question 8 of 20 9. If gold content of the alloy decreases:Strength increases, ductility decreasesBoth strength and ductility increasesStrength decreases, ductility increasesBoth strength and ductility decreasesQuestion 9 of 20 10. the significance of free eugenol in root canal sealer cements is an increase insetting timecytotoxicitystrengthdimensional stabilityQuestion 10 of 20 11. the strength of gypsum bonded investment is dependednt upongypsum contentcarbon contentsilica contentcopper contentQuestion 11 of 20 12. What distinguishes a base from a cement from a cavity liner?degree of pulpal protectionfinal application thicknessdegree of hardnessbiocompatibility of materialQuestion 12 of 20 13. Camouflage is a property of which ceramic?CerecCerastoneDicorAllQuestion 13 of 20 14. Inlay wax suitable for making indirect pattern isType IIIType IIType IAny of the aboveQuestion 14 of 20 15. heat energy required for vaporisation of liquid after boilinglatent heat of sublimationlatent heat of fusionlatent heat of vaporisationmelting temperatureQuestion 15 of 20 16. direct wax pattern may distort due torelease of internal stressesthe placement of reserviormethoc of heating of waxcomposition of waxQuestion 16 of 20 17. Best material for casting base metal crown isGypsum bondedHigh refractory silica bondedSilica bondedPhosphate bondedQuestion 17 of 20 18. Phosphate bonded investment is made carbon free:To produce smooth castingTo prevent staining of ceramicFor easier divesting of investmenTo prevent brittleness of alloyQuestion 18 of 20 19. Disinfection of alginate impressions when immersion method is used should not exceed5m20m10m30mQuestion 19 of 20 20. in size the largest porosities in a casting are of which typemicroporositysuck backpin holegas inclusionQuestion 20 of 20 Loading...
