1. When electroplating an impression with copper the cathode isThe impression being electroplatedDistilled waterA copper paste or rodCopper sulphateQuestion 1 of 20 2. the heat treatment of soaking the alloy at a high temp to produce a solid solution followed by quenching is known assolution heat treatmentstrain hardening heat treatmentage hardeningliquid heat treatmentQuestion 2 of 20 3. the strength of gypsum bonded investment is dependednt upongypsum contentcarbon contentsilica contentcopper contentQuestion 3 of 20 4. Microwave polymerisation for Acrylic dentures uses:Heat ConvectionHeat ConductionMagnetic FieldRadiationQuestion 4 of 20 5. What chemical is added to prevent polymerization of polymethylmethacrylate during storage:Tertiary aminesHydroquinoneCamphorquinoneBenzoyl peroxideQuestion 5 of 20 6. which of the following is not a nobel metalrutheniumsilverosmiumgoldQuestion 6 of 20 7. Which impression material is radio opaque:PolysulfidePoly etherAddition siliconeCondensation siliconeQuestion 7 of 20 8. the accuracy of the temperature of the casting furnace may be verified byreading the pyrometerobserving the color of the mold in shadowusing a thermometerusing templates of chemicals that melt at a specific temperatureQuestion 8 of 20 9. Which of the following is a resorbable Bio- ceramic?CarbonAluminaCalcium phosphateZirconiaQuestion 9 of 20 10. which zone of flame is used for melting alloyscentral zonereducing zonecombustion zoneoxidising zoneQuestion 10 of 20 11. for best results when using an elastic impression material the prepared tooth should becovered with a surface tension reducing agent or air driedcovered thinly with a waer soluble lubricantfree of surface moisturevery dryQuestion 11 of 20 12. The process by which a casting is heated in a porcelain furnace to a temperature of 980"C to burn off any remaining impurities prior to adding porcelain is called:picklinginvestingdegassingquenchingQuestion 12 of 20 13. in an alginate impression material trisodium phosphate is theretarderacceleratorreactorfillerQuestion 13 of 20 14. Which of the following property of amalgam is adversely affected by triturating with mechanical deviceLess tarnish resistanceWorking timeHardness of final mixtureGloss of final mixtureQuestion 14 of 20 15. Which of these is moisture active adhesive?Methyl methacrylateAll of the aboveBis-GMACyanoacrylateQuestion 15 of 20 16. role if indium in amalgam isto reduce elease of mercury during masticationto reduce formation of gamma 2 phaseto reduce formation of gamma phaseto reduce release of mercury during amalgam polishingQuestion 16 of 20 17. the main advantage of a natural glaze rather than an applied glaze is that the natural glazeis easier to achieveis more permanentrequires a lower firing temperatureoffers best estheticsQuestion 17 of 20 18. dental impression compound is characterised by having aspecific melting pointcrystalline atomic structurecross linkage reaction upon heatingrelatively low thermal conductivityQuestion 18 of 20 19. Polysulfide impression material should be:poured within 30 minutespoured within 1 hourpoured immediatelypoured within 15 minutesQuestion 19 of 20 20. Which of the following is known as smart ceramic:ZirconiaBioceramicnone of the aboveFeldspathic porcelainQuestion 20 of 20 Loading...