1. Which of the following is a solid solution? cobalt chromium silver palladium gallium silver alloy amalgam 2. During final finishing of composite you find a void, what will you do: Remove entire composite and refill it Re-etch and fill the composite Fill with composite after etching, application of bonding agent Leave as it is 3. Inlay wax suitable for making indirect pattern is Type II Any of the above Type I Type III 4. Continues use of vibrator during investing leads to? Surface roughness Surface irregularities Random nodule formation Discoloration 5. Which of the following statements is not true regarding creep? creep gradually increases the marginal integrity of an amalgam restoration creep is a process that happens over time increasing the condensation pressure decreases the creep rate undertrituration tends to increase the creep rate 6. metal ceramic restorations may fail due to fracture of the ceramic material .this can be best avoided if the casting is designed to reduce stress concentration in the ceramic material occlusal forces are minimal the metal is not over 0.5 mm thick the ceramic material is at least 1.5 mm thick 7. Which of the following cannot be used for debridement of zirconia implant surface Titanium coated instrument Gold tip instrument Hi grade plastic instrument Stainless steel instrument 8. With which of the following impression materials is it advisable to wait 20 to 30 minutes before pouring of models for stress relaxation to occur? Polysulfides polyvinyl siloxanes condensation silicones polyethers 9. 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 powder is added to the water to avoid using more than one bowl the addition of powder prevents the mix from becoming exothermic this process results in better powder mixing and reduced chance for air bubbles 10. mercury disposal is done by treatment with acid controlled combustion safe collection and reuse deep burial 11. When electroplating an impression with copper the cathode is Copper sulphate A copper paste or rod The impression being electroplated Distilled water 12. In metal-ceramic restorations, failure or fracture usually occurs: in the porcelain at the porcelain-metal interface None of the above in the metal 13. Stress is: Force applied perpendicular to the surface An internal force opposing an applied load A deformation resulting from an applied load Force applied per unit area 14. Contact angle between liquid and adherend surface is 180 degree. This suggests Poor wetting Good wetting none of the above Completely non wetting 15. the antiflux used for gold solders is graphite cryolite titanium silicon 16. Shrinkage porosity is related to Molten metal Sprue size Temperature Inlay wax 17. Function of molybdenum in base metal alloys? Decrease corrosion resistance Increases strength Increase CTE Decreases strength 18. an amalgam is an alloy one of whose consituent is silver of silver and tin of two or more metals one of those whose constituent is mercury 19. For obtaining harder dies to be used for making wax patterns, all of the following can be done except Addition of die hardener to gypsum Silver plating of die Use an epoxy resin based die Gold plating of die 20. The main component of gypsum bonded investment which provides thermal expansion to compensate for alloy solidification shrinkage is None of the above Binder Modifiers like magnesium oxide and sodium chloride Refractory filler Loading … Question 1 of 20
