1. 18/8 stainless steel contains:18% nickel, 8% chromium18% chromium, 8% nickel18% chromium, 8% beryllium18% chromium, 8% cobaltQuestion 1 of 20 2. Young's modulus is defined as:Stress/strain below elastic limitArea under the stress strain curve till point of fractureLimit where a material shows plastic defonnationStress/strain above elastic limitQuestion 2 of 20 3. Which property of composites is most affected by the size and number of fillers:Thermal expansionThermal contractionWater sorptionPolymerization shrinkageQuestion 3 of 20 4. Pinhole porosities are related toSprue casting dissociationEntrapement of gas during solidificationCasting investment junctionDistortion of wax patternQuestion 4 of 20 5. Brush heap structure is seen in:AlginateImpression compoundAddition siliconesPolyethersQuestion 5 of 20 6. Which of the following is known as smart ceramic:Feldspathic porcelainZirconiaBioceramicnone of the aboveQuestion 6 of 20 7. Stress is:A deformation resulting from an applied loadForce applied per unit areaAn internal force opposing an applied loadForce applied perpendicular to the surfaceQuestion 7 of 20 8. The chamelon effect has been portrayed by which of the ceramic restorationsIn ceramCerestoreCerecDicorQuestion 8 of 20 9. the effectiveness of condensation and prevention of porcelain shrinkage is determined byuse of powder containing particles that are of same sizespeed of icrease of furnace heatshape and size of particlesthickness of platinum mixQuestion 9 of 20 10. in an alginate impression material trisodium phosphate is thefillerreactorretarderacceleratorQuestion 10 of 20 11. The phenomenom where porcelain appears different under varying light conditions isRegractive opticsOpacificationMetamerismTransmittanceQuestion 11 of 20 12. When using which impression material can you delay pouring up of the model for up to one week?polysulfidePolyetherpoly vinyl siloxanereversible hydrocolloidQuestion 12 of 20 13. Cavity Varnish is used with:CompositeAmalgamCompomerGlass IonomerQuestion 13 of 20 14. About pit and fissure sealant which is wrongIn sealed fissures prevent odonto pathogenic bacterial growthIf in doubt whether the teeth is carious or not seal it with pit and fissure sealantIt is made of composite resin and sealant to prevent the cAriesIt includes enamel bonding agent and resin without filler contentQuestion 14 of 20 15. Nodule on the intaglio surface of a casting can be prevented byUse of a vibrator during investing of the wax patternSpraying a surfactant on the wax pattern before investingUse of die spacerWet the wax with water before investingQuestion 15 of 20 16. Bur used for smooth finishing:12 fluted carbide bursDiamond bur18 flute carbide burs6 fluted carbide bursQuestion 16 of 20 17. main advantage of zinc phosphate over GIC ismore biocompatibilityincreased tensile strengthincrease modulus of elasticityincrease compressive strengthQuestion 17 of 20 18. Which of the following is used for making blades and sharp surgical instruments:martensitic steelAustenitic steelnone of the aboveFerrite steelQuestion 18 of 20 19. Which of the following cements provide maximum resistance to decalcification while placing bands on molarSilicatePolycarboxylateZinc phosphateGICQuestion 19 of 20 20. which of the following will form a peritectic alloysilver and goldsilver and coppersilver and tinsilver and palladiumQuestion 20 of 20 Loading...