1. the antiflux used for gold solders issilicongraphitetitaniumcryoliteQuestion 1 of 20 2. Non eugenol pastes contain ____ instead of eugenol:Zinc acetatePolyethylmethacrylateZinc chlorideOrthoethoxy benzoic acidQuestion 2 of 20 3. dental impression compound is characterised by having aspecific melting pointcrystalline atomic structurerelatively low thermal conductivitycross linkage reaction upon heatingQuestion 3 of 20 4. Which property of composites is most affected by the size and number of fillers:Water sorptionThermal expansionThermal contractionPolymerization shrinkageQuestion 4 of 20 5. When electroplating an impression with copper the cathode isCopper sulphateThe impression being electroplatedA copper paste or rodDistilled waterQuestion 5 of 20 6. During polymerisation from monomer to polymerdensity changes from 1.19 to 0.94 and volume shrinkage 21%density changes from 0.94 to 1.19 and volume shrinkage 7%density changes from 1.19 to 0.94 and volume shrinkage 7%density changes from 0.94 to 1.19 and volume shrinkage 21%Question 6 of 20 7. high copper amalgams are superior to low copper amalgams because ofthey have high ratio of compressive to tensile or tensile to compressive strengthare workable at low mercury alloy ratiosthey corrode in oral cavityshows less marginal fractureQuestion 7 of 20 8. One disadvantage of dental porcelain restorations is:brittlenesspoor estheticsexpansionradioactivityQuestion 8 of 20 9. 18/8 stainless steel contains:18% chromium, 8% beryllium18% chromium, 8% cobalt18% chromium, 8% nickel18% nickel, 8% chromiumQuestion 9 of 20 10. self curing acrylics for tooth restorations are least compatible with which materialcopal varnisheugenolalcoholcalcium hydroxideQuestion 10 of 20 11. Camouflage is a property of which ceramic?AllDicorCerecCerastoneQuestion 11 of 20 12. in an alginate impression material trisodium phosphate is thereactorretarderfilleracceleratorQuestion 12 of 20 13. Structural durability is a?Structural phenomenonNone of the aboveBiological phenomenonMechanical phenomenonQuestion 13 of 20 14. Brush heap structure is seen in:Addition siliconesPolyethersAlginateImpression compoundQuestion 14 of 20 15. the restorative material having hardness nearest to that of enamel issilicate cementmicrofilled composite resindirect filling goldamalgamQuestion 15 of 20 16. Young's modulus is defined as:Area under the stress strain curve till point of fractureLimit where a material shows plastic defonnationStress/strain above elastic limitStress/strain below elastic limitQuestion 16 of 20 17. methyl methacrylate can be activated by all of the following exceptlead peroxidetertiary aminesheatsulfuric acid derivativesQuestion 17 of 20 18. All of the following statements are true regarding glass ionomer restorations,exceptglass ionomer adheres to mineralized tooth tissueglass ionomers are somewhat esthetic and polish much better than compositesglass ionomer is often the ideal material of choice for restoring root surface caries in patients with high caries activitythe best surface finish for a glass ionomer restoration is that obtained against a surface matrixQuestion 18 of 20 19. anti rust agent is2 %potassium nitrate2 % sodium nitrite2 % sodium nitrate4 % sodium nitrateQuestion 19 of 20 20. After mixing powder and liquid in case of alginate impression material, gelation will occur in what time (at room temperature)?3-4 minutes10-12 minutes1-2 minutes6-7 minutesQuestion 20 of 20 Loading...