1. condensation shrinkage during porcelain firing is determined byrate of firingtype of investment useduniform distriution of particle sizesize and shape of particleQuestion 1 of 20 2. self curing acrylics for tooth restorations are least compatible with which materialalcoholcopal varnisheugenolcalcium hydroxideQuestion 2 of 20 3. for zinc oxide eugenol all of the following are true exceptresin decreses the brittleness of set cementaddition of methyl methacrylate resin increases strengthaddition of EBA in concentration of 37-50 percent increases strengtholive oil is used as plasticizerQuestion 3 of 20 4. Young's modulus is defined as:Limit where a material shows plastic defonnationStress/strain below elastic limitStress/strain above elastic limitArea under the stress strain curve till point of fractureQuestion 4 of 20 5. Palladium and platinum are added to base metal alloys to:Impart colorAs grain refinersReduce brittlenessAct as scavengerQuestion 5 of 20 6. When using which impression material can you delay pouring up of the model for up to one week?reversible hydrocolloidpoly vinyl siloxanepolysulfidePolyetherQuestion 6 of 20 7. the penetration of the fissure sealant into the fissuresmust occur before the polymerisation of the materialis the result of a chemical bond between the sealant and enamelis independent of the chemical composition of the enamelis not influenced by the wettability of the enamelQuestion 7 of 20 8. Which of the following property of amalgam is adversely affected by triturating with mechanical deviceWorking timeLess tarnish resistanceHardness of final mixtureGloss of final mixtureQuestion 8 of 20 9. Which of the following is true statements regarding the polishing of amalgam?it should be done with a dry polishing powderocclusion should not be checked prior to polishingit prevents tarnishing of the restorationit should be done about 10 minutes after placementQuestion 9 of 20 10. the working time of a phosphate investment mix can be increases by increasing theall of the aboveliquid /powder ratiotempperature of the mixmixing time and mixing efficiencyQuestion 10 of 20 11. Which of the following cannot be used for debridement of zirconia implant surfaceStainless steel instrumentGold tip instrumentTitanium coated instrumentHi grade plastic instrumentQuestion 11 of 20 12. Loss of colour stability in self polymerizing resins is due to degradation of:Tertiary aminePolymethyl methacrylateBenzoyl peroxide initiatorHydroquinoneQuestion 12 of 20 13. Maximum shrinkage occurs in which stage:High bisqueLow bisqueAll stages show equal shrinkageMedium bisqueQuestion 13 of 20 14. Soldering flux is composed of all of the following EXCEPT one. Which one is the EXCEPTION?silicaalumboraxsodium pyroborateQuestion 14 of 20 15. which zone of flame is used for melting alloyscombustion zonereducing zonecentral zoneoxidising zoneQuestion 15 of 20 16. When Alginate is mixed with tap water having high calcium sulfate and magnesium, what happensAcceleration of setting reactionPermanent deformation of alginateRetardation of setting reactionWeakened stone diesQuestion 16 of 20 17. Pinhole porosities are related toDistortion of wax patternSprue casting dissociationCasting investment junctionEntrapement of gas during solidificationQuestion 17 of 20 18. Which property of composites is most affected by the size and number of fillers:Polymerization shrinkageThermal expansionThermal contractionWater sorptionQuestion 18 of 20 19. heat energy required for vaporisation of liquid after boilingmelting temperaturelatent heat of fusionlatent heat of sublimationlatent heat of vaporisationQuestion 19 of 20 20. Which material has least shelf lifePolysulphideAddition siliconeCondensation siliconePolyetherQuestion 20 of 20 Loading...