1. the porcelain constituent that fuses at firing temperature and forms a matrix is aluminium oxide kaolin feldspar quartz 2. Fluoride flux used in soldering works by Preventing flow of solder to other areas Prevents formation of chromium oxide or dissolves already formed chromium oxide Weakens the solder joint Forms a protective film during soldering 3. In mixing dental stone, why should the powder be sprinkled onto the water in the bowl? this is not recommended; the water should be added to the powder the addition of powder prevents the mix from becoming exothermic the powder is added to the water to avoid using more than one bowl this process results in better powder mixing and reduced chance for air bubbles 4. Metal oxides are added to powder of porcelain for Give color , decrease strength Give color, increase strength Decrease strength; act as a refractory skeleton Increased strength; act as a refractory skeleton 5. In metal-ceramic restorations, failure or fracture usually occurs: in the porcelain at the porcelain-metal interface in the metal None of the above 6. Which of the following is true statements regarding the polishing of amalgam? it should be done with a dry polishing powder it should be done about 10 minutes after placement it prevents tarnishing of the restoration occlusion should not be checked prior to polishing 7. Cutting edge of surgical burs are made from martensite form rather than austenite form due to which of the following reason Martensite form is hard Martensite form has less strength Martensite form is corrosion resistant Martensite form is very brittle 8. Stiffness is: Relative softness of material Relative hardness of a material Ability to resist deformation Ability to be drawn into wires 9. The process in which a solid melts into a liquid with a separate crystalline phase is known as: Sintering Congruent Melting Incongruent melting Ceramming 10. Which of these is moisture active adhesive? All of the above Cyanoacrylate Methyl methacrylate Bis-GMA 11. Which of the following cements provide maximum resistance to decalcification while placing bands on molar Zinc phosphate Polycarboxylate GIC Silicate 12. Stiffness is related to? Degree of plastic resistance Degree of elastic resistance Resistance to plastic deformation Resistance to elastic deformation 13. which of the following is not a nobel metal silver gold ruthenium osmium 14. strain hardening of a metal decreases its proportional limit resistance to corrosion surface hardness strength 15. Shrinkage porosity is related to Temperature Molten metal Sprue size Inlay wax 16. Which impression material is most difficult to remove without fracturing teeth of a stone model? Polysulphide Condensation silicone Polyether Addition Silicone 17. Inlay wax suitable for making indirect pattern is Type II Type III Type I Any of the above 18. Hardening heat treatment for gold copper alloys involves Quenching immediately after recrystallisation Quenching immediately after casting Heating to 350 degree C for 15-30 min followed by quenching Heating to 700 degree C for 10 min followed by quenching 19. percentage of phosphoric acid where Dicalcium monophosphate is formed; which cannot be easily removed 50 percent 85 percent 25 percent 37 percent 20. Strength of gypsum is measured as Wet strength Compressive strength Green strength Tensile strength Loading … Question 1 of 20
