1. 18/8 stainless steel contains:18% chromium, 8% beryllium18% chromium, 8% nickel18% nickel, 8% chromium18% chromium, 8% cobaltQuestion 1 of 20 2. There are four types of gypsum products approved for use in dentistry. Which of the following types is used rarely today?Type IIIType IType IVType IIQuestion 2 of 20 3. After mixing powder and liquid in case of alginate impression material, gelation will occur in what time (at room temperature)?10-12 minutes1-2 minutes3-4 minutes6-7 minutesQuestion 3 of 20 4. Fins and spines in casting are caused by:Water film presentProlonged heatingRapid heating of investmentIncreased casting pressureQuestion 4 of 20 5. Use of type II ZOE cement:Permanent cementationTemporary restorationIntermediate restorationTemporary cementationQuestion 5 of 20 6. Principle hardener in gold alloy isPalladiumCopperZincSilverQuestion 6 of 20 7. 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 should be done about 10 minutes after placementit prevents tarnishing of the restorationQuestion 7 of 20 8. when force is applied perpendicular to the metal surface,resultant deformation isshearing stresscompressive straintensile stresstensile strainQuestion 8 of 20 9. The main component of gypsum bonded investment which provides thermal expansion to compensate for alloy solidification shrinkage isModifiers like magnesium oxide and sodium chlorideNone of the aboveBinderRefractory fillerQuestion 9 of 20 10. porcelain are made opaque by the addition of oxides ofnickel and iridiumboron and magnesiumiron and aluminiumtitanium and tinQuestion 10 of 20 11. Strength of gypsum is measured asTensile strengthGreen strengthWet strengthCompressive strengthQuestion 11 of 20 12. Metal oxides are added to powder of porcelain forDecrease strength; act as a refractory skeletonIncreased strength; act as a refractory skeletonGive color, increase strengthGive color , decrease strengthQuestion 12 of 20 13. Which of the following is known as smart ceramic:Feldspathic porcelainZirconianone of the aboveBioceramicQuestion 13 of 20 14. Which of the following will produce the most rigid restoration for framework of same dimensionWrought alloyPartial denture casting gold in hardened conditionPalladium alloysCobalt chrome alloysQuestion 14 of 20 15. the effectiveness of condensation and prevention of porcelain shrinkage is determined byspeed of icrease of furnace heatshape and size of particlesthickness of platinum mixuse of powder containing particles that are of same sizeQuestion 15 of 20 16. Correct property of the tilite alloy isComposition is nickel, chromium, molybdenum, titaniumBonding to porcelain is more as compare to noble metalCantilever up to 5 mm can be givenIdeal for implantsQuestion 16 of 20 17. Wettability can be increased by:Reducing the internal stressesIncrease in surface areaIncreasing the contact angleIncrease in surface energyQuestion 17 of 20 18. Cementation failure of a prosthesis cemented with Zinc Polycarboxylate occurs at:Cement tooth interfaceBetween cement layerCement and prosthesis interfaceIn the prosthesis itselfQuestion 18 of 20 19. A very active metal which is gas at room temperature isMercuryOxygenHydrogenGalliumQuestion 19 of 20 20. Palladium and platinum are added to base metal alloys to:As grain refinersAct as scavengerReduce brittlenessImpart colorQuestion 20 of 20 Loading...