1. exposure of a stone cast to tap water should be minimised becausethe cast will be weakenedthe surface of the cast will acquire a chalky appearancedimensional achange will occur in th ecasteroding of the cast will resultQuestion 1 of 20 2. Enamel resin bond used forImprove mechanical bond of resinConsist of a highly filled liquid acrylic monomer mixture placed onto acid etched enamelIt has no role in preventing micro leakageCan be used for enamel as well as DentineQuestion 2 of 20 3. In hot and dry environment, alginate shrinks bySyneresisImbibitionHysteresisAccretionQuestion 3 of 20 4. which of the following is not a nobel metalsilverrutheniumgoldosmiumQuestion 4 of 20 5. a thinner mix of gypsum bondeded investment will result inincreases thermal expansionincreases setting expansionproduce a smoother castingdecrease setting expansionQuestion 5 of 20 6. Hardness of which material is more than enamel:GoldCeramicCompositeAmalgamQuestion 6 of 20 7. Bond strength required to counteract the effect of polymerization shrinkage in composite resins:17 MPa56 MPa21 MPa7 MPaQuestion 7 of 20 8. Cavity Varnish is used with:AmalgamCompositeGlass IonomerCompomerQuestion 8 of 20 9. Best material for casting base metal crown isPhosphate bondedGypsum bondedHigh refractory silica bondedSilica bondedQuestion 9 of 20 10. Wettability can be increased by:Increase in surface areaReducing the internal stressesIncrease in surface energyIncreasing the contact angleQuestion 10 of 20 11. In orthodontic stainless steel wire which of the following is used to reduce hardness?CarbonSiliconeChromiumCobaltQuestion 11 of 20 12. condensation shrinkage during porcelain firing is determined byuniform distriution of particle sizetype of investment usedrate of firingsize and shape of particleQuestion 12 of 20 13. anti rust agent is2 %potassium nitrate4 % sodium nitrate2 % sodium nitrate2 % sodium nitriteQuestion 13 of 20 14. what filler is used in impression compound "alginate"calcium alginatesodium phosphatesodium bicarbonatediatomaceous earthQuestion 14 of 20 15. Continues use of vibrator during investing leads to?Surface irregularitiesRandom nodule formationDiscolorationSurface roughnessQuestion 15 of 20 16. Clinical appearance of GIC is dictated byParticle size of powderAcid content of liquidViscosity of liquidChemical composition of cementQuestion 16 of 20 17. for zinc oxide eugenol all of the following are true exceptresin decreses the brittleness of set cementolive oil is used as plasticizeraddition of EBA in concentration of 37-50 percent increases strengthaddition of methyl methacrylate resin increases strengthQuestion 17 of 20 18. Gutta percha, stearic acid and shellac are added to impression compound to:To improve softness at melting temperatureTo prevent leaching out ofthermolabile componentsImprove workability & plasticityTo increase stifthess and hardness of the compoundQuestion 18 of 20 19. the significance of free eugenol in root canal sealer cements is an increase instrengthsetting timedimensional stabilitycytotoxicityQuestion 19 of 20 20. ductility meansthe metal can be transformed into sheetspercentage elongationincreases with rise in temperaturesubjecting a cylindrical specimen to a compressive loadQuestion 20 of 20 Loading...