1. Which of the following property of amalgam is adversely affected by triturating with mechanical device Hardness of final mixture Gloss of final mixture Working time Less tarnish resistance 2. The process by which a casting is heated in a porcelain furnace to a temperature of 980″C to burn off any remaining impurities prior to adding porcelain is called: pickling quenching investing degassing 3. Fluid wax impression techniques may use following waxes except Sticky wax Applegates fluid wax Korecta wax Kerr ivory inlay wax 4. During polymerisation from monomer to polymer density changes from 1.19 to 0.94 and volume shrinkage 7% density changes from 0.94 to 1.19 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 21% 5. Maximum flow of Type I inlay wax at 45 degrees: 10percent 2 percent 70percent 3percent 6. Which of the following investment exhibit green shrinkage Silica bonded All of the above Gypsum bonded Phosphate bonded 7. The dentist can best control the setting time of irreversible hydrocolloid impression material by altering the Amount of retarder added Mixing time Water temperature Water powder ratio 8. maximum shrinkage of firing of ceramic occurs during which stage high bisque low bisque none of the above medium bisque 9. Fins and spines in casting are caused by: Prolonged heating Water film present Increased casting pressure Rapid heating of investment 10. Which of the following is used for making blades and sharp surgical instruments: Ferrite steel none of the above Austenitic steel martensitic steel 11. Enamel resin bond used for Improve mechanical bond of resin It has no role in preventing micro leakage Can be used for enamel as well as Dentine Consist of a highly filled liquid acrylic monomer mixture placed onto acid etched enamel 12. the strength of gypsum bonded investment is dependednt upon gypsum content copper content silica content carbon content 13. Loss of colour stability in self polymerizing resins is due to degradation of: Polymethyl methacrylate Hydroquinone Benzoyl peroxide initiator Tertiary amine 14. Stiffness is related to? Degree of elastic resistance Resistance to elastic deformation Degree of plastic resistance Resistance to plastic deformation 15. There are four types of gypsum products approved for use in dentistry. Which of the following types is used rarely today? Type III Type I Type II Type IV 16. Best cementing medium for self retained all ceramic crown is GIC Chemical cure resin RMGIC Dual cure resin 17. By product of setting reaction of condensation silicon: Water Hydrogen Acetone Ethyl alcohol 18. the most important mechanical property involved when a base metal partial denture clasp is adjusted is elastic imit tensile strength elongation hardness 19. percentage of phosphoric acid where Dicalcium monophosphate is formed; which cannot be easily removed 50 percent 25 percent 85 percent 37 percent 20. when force is applied perpendicular to the metal surface,resultant deformation is tensile stress compressive strain shearing stress tensile strain Loading … Question 1 of 20
