1. Nodule on the intaglio surface of a casting can be prevented bySpraying a surfactant on the wax pattern before investingUse of a vibrator during investing of the wax patternUse of die spacerWet the wax with water before investingQuestion 1 of 20 2. Polishing agent which is known as whitening agentNone of the aboveRougeIron oxideChromium oxideQuestion 2 of 20 3. In metal-ceramic restorations, failure or fracture usually occurs:at the porcelain-metal interfacein the porcelainNone of the abovein the metalQuestion 3 of 20 4. Lower density usually means?Low strengthHigh strengthLow melting temperatureLighter weightQuestion 4 of 20 5. In orthodontic stainless steel wire which of the following is used to reduce hardness?ChromiumSiliconeCobaltCarbonQuestion 5 of 20 6. Stain removing commercial denture cleanser usually containSodium perborateSoda ashPotassium perborateSodium hypochloriteQuestion 6 of 20 7. oxides of all of the following elements in noble metal alloys help in bonding to porcelain exceptnickelirontinindiumQuestion 7 of 20 8. Hardening heat treatment for gold copper alloys involvesQuenching immediately after castingQuenching immediately after recrystallisationHeating to 350 degree C for 15-30 min followed by quenchingHeating to 700 degree C for 10 min followed by quenchingQuestion 8 of 20 9. which zone of flame is used for melting alloyscombustion zonereducing zoneoxidising zonecentral zoneQuestion 9 of 20 10. what filler is used in impression compound "alginate"sodium bicarbonatecalcium alginatediatomaceous earthsodium phosphateQuestion 10 of 20 11. the primary purpose of rinsing a set impression with a watery mix of dental stoneto remove residual saliva from the surface of impressionto prevent further gelationto retard shrinkage due to syneresisto increase the gel strengthQuestion 11 of 20 12. Cavity Varnish is used with:AmalgamCompositeGlass IonomerCompomerQuestion 12 of 20 13. Casting shrinkage in a type 2 gypsum investment is counteracted by:Setting expansion of investmentHygroscopic setting expansion of investmentIncreasing the thickness of casting ringThermal expansion of the investmentQuestion 13 of 20 14. Least soluble cement in water:GICSilicateZinc phosphateZinc oxide eugenolQuestion 14 of 20 15. 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 15 of 20 16. Young's modulus is defined as:Limit where a material shows plastic defonnationArea under the stress strain curve till point of fractureStress/strain below elastic limitStress/strain above elastic limitQuestion 16 of 20 17. Which of the following statements is not true regarding glass ionomer cements?good thermal insulatorhigh solubility after initial settingthermal expansion similar to toothrelease fluorideQuestion 17 of 20 18. Most common accelerator used in gypsum is:2% sodium sulphate2% potassium sulphateSodium Chloride1 % potassium sulphateQuestion 18 of 20 19. Least amount of mercury is required inHybridAdmixedLathe cutSphericalQuestion 19 of 20 20. Type I GIC isRestorativeResin modifiedLiningLutingQuestion 20 of 20 Loading...