1. Which of the following is formed by spray atomization and chemical precipitation of molten goldCrystalline goldGranular goldMat goldGold foilQuestion 1 of 20 2. Must commonly used coupling agent of composites:-SilicatesOrganosilanesZirconateTitanatesQuestion 2 of 20 3. porcelain are made opaque by the addition of oxides ofnickel and iridiumtitanium and tinboron and magnesiumiron and aluminiumQuestion 3 of 20 4. Tg of impression compound is43.5 degree c39 degree c65 degree c100 degree cQuestion 4 of 20 5. What distinguishes a base from a cement from a cavity liner?final application thicknessdegree of hardnessbiocompatibility of materialdegree of pulpal protectionQuestion 5 of 20 6. Maximum shrinkage occurs in which stage:Medium bisqueHigh bisqueAll stages show equal shrinkageLow bisqueQuestion 6 of 20 7. a thinner mix of gypsum bondeded investment will result inincreases thermal expansionproduce a smoother castingincreases setting expansiondecrease setting expansionQuestion 7 of 20 8. an advantage of rubber base impression material over reversible hydrocolloid material is that rubber base impression materialis significantly more accuratewill displace soft tissueis more accurate if saliva mucus or blood is presentrequires less armamentariumQuestion 8 of 20 9. for zinc oxide eugenol all of the following are true exceptaddition of methyl methacrylate resin increases strengthresin decreses the brittleness of set cementaddition of EBA in concentration of 37-50 percent increases strengtholive oil is used as plasticizerQuestion 9 of 20 10. the primary purpose of rinsing a set impression with a watery mix of dental stoneto retard shrinkage due to syneresisto prevent further gelationto remove residual saliva from the surface of impressionto increase the gel strengthQuestion 10 of 20 11. Maximum flow of Type I inlay wax at 45 degrees:70percent3percent2 percent10percentQuestion 11 of 20 12. Which of the following statements is not true regarding creep?creep is a process that happens over timeundertrituration tends to increase the creep ratecreep gradually increases the marginal integrity of an amalgam restorationincreasing the condensation pressure decreases the creep rateQuestion 12 of 20 13. Continues use of vibrator during investing leads to?Surface irregularitiesRandom nodule formationDiscolorationSurface roughnessQuestion 13 of 20 14. self curing acrylics for tooth restorations are least compatible with which materialcopal varnishcalcium hydroxideeugenolalcoholQuestion 14 of 20 15. If gold content of the alloy decreases:Both strength and ductility decreasesBoth strength and ductility increasesStrength increases, ductility decreasesStrength decreases, ductility increasesQuestion 15 of 20 16. Transformation toughening of zirconia occurs due to change in phase from:Monoclinic to tetragonalCubic to tetragonalTetragonal to monoclinicAustenitic to martensitiQuestion 16 of 20 17. For obtaining harder dies to be used for making wax patterns, all of the following can be done exceptUse an epoxy resin based dieAddition of die hardener to gypsumGold plating of dieSilver plating of dieQuestion 17 of 20 18. ductility meanssubjecting a cylindrical specimen to a compressive loadincreases with rise in temperaturepercentage elongationthe metal can be transformed into sheetsQuestion 18 of 20 19. Bur used for smooth finishing:18 flute carbide burs6 fluted carbide bursDiamond bur12 fluted carbide bursQuestion 19 of 20 20. Suck back porosity is caused byImproper venting of waxHot metal impinging on the mold surface to cause a hot spotAttaching sprue in proximal surfacesImproper removal of gasQuestion 20 of 20 Loading...
