1. A very active metal which is gas at room temperature is Gallium Oxygen Hydrogen Mercury 2. The chamelon effect has been portrayed by which of the ceramic restorations Cerec In ceram Dicor Cerestore 3. strain hardening of a metal decreases its surface hardness resistance to corrosion strength proportional limit 4. Etching of feldspathic ceramic: HCL 35% Phosphoric acid HF acid HN03 5. the difference between heat cured and cold cured acrylic resin is least significant with respect to the property of internal porosity color stability hardness transverse strength 6. the union of metal to porcelain fused restoration is by cobalt and porcelain tin and indium oxides nickel and orcelain mechanically rough surface 7. If gold content of the alloy decreases: Strength increases, ductility decreases Both strength and ductility increases Both strength and ductility decreases Strength decreases, ductility increases 8. the property of amalgam that makes it undesirable to bevel occlusal margins of an amalgam cavity preparation is its malleability brittleness ductility flow 9. methyl methacrylate can be activated by all of the following except sulfuric acid derivatives tertiary amines heat lead peroxide 10. when force is applied perpendicular to the metal surface,resultant deformation is shearing stress tensile strain tensile stress compressive strain 11. the porcelain constituent that fuses at firing temperature and forms a matrix is quartz aluminium oxide kaolin feldspar 12. setting time of zinc phospahte cement is retarted by increasing the powder liquid ratio decreasing the rate of addition of powder to liquid diluting the liquid with a small amount of water increasing the rate of addition of powder to liquid 13. gold alloys used for the fabrication of saddle bars and clasps are type III type IV type II type I 14. A base that is typically placed over a calcium hydroxide base (which has been placed over a pulp exposure); is known as: indirect base secondary base primary base direct base 15. a cermet is a combination of conventional and aluminous ceramic powders silver amalgam powder and glass ionomer powder the powders of polycarboxylate and composite resin cements feldspar and quartz 16. Polishing agent which is known as whitening agent Rouge None of the above Chromium oxide Iron oxide 17. Hardening heat treatment for gold copper alloys involves Heating to 350 degree C for 15-30 min followed by quenching Quenching immediately after casting Heating to 700 degree C for 10 min followed by quenching Quenching immediately after recrystallisation 18. the strength of gypsum bonded investment is dependednt upon copper content gypsum content silica content carbon content 19. the accuracy of the temperature of the casting furnace may be verified by reading the pyrometer using templates of chemicals that melt at a specific temperature observing the color of the mold in shadow using a thermometer 20. The ratio of transverse contraction strain to longitudinal extension strain in the direction of stretching force is known as Shear stress Poissons ratio Compressive stress Tensile stress Loading … Question 1 of 20
