1. Least amount of mercury is required in Admixed Hybrid Lathe cut Spherical 2. in processing an acrylic denture in a water bath a proper heating cycle is desired because of the possibility of warpage porosity due to boiling of the monomer volumetric expansion of the denture causing an open bite shrinkage of the denture 3. Stiffness is related to? Degree of elastic resistance Resistance to plastic deformation Degree of plastic resistance Resistance to elastic deformation 4. Non eugenol pastes contain ____ instead of eugenol: Polyethylmethacrylate Zinc chloride Orthoethoxy benzoic acid Zinc acetate 5. Green shrinkage seen in : It is seen in all types of investments Ethyl Silicate bonded investment Phosphate Bonded Investment Gypsum Bonded investment 6. Pinhole porosities are related to Entrapement of gas during solidification Distortion of wax pattern Sprue casting dissociation Casting investment junction 7. dental impression compound is characterised by having a specific melting point relatively low thermal conductivity cross linkage reaction upon heating crystalline atomic structure 8. Palladium and platinum are added to base metal alloys to: Act as scavenger Impart color Reduce brittleness As grain refiners 9. 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 10. Which of the following will produce the most rigid restoration for framework of same dimension Partial denture casting gold in hardened condition Wrought alloy Cobalt chrome alloys Palladium alloys 11. gypsum investments disintegrates at 195 degree C 200 degree C 140 degree C 700 degree C 12. setting time of zinc phospahte cement is retarted by increasing the rate of addition of powder to liquid decreasing the rate of addition of powder to liquid increasing the powder liquid ratio diluting the liquid with a small amount of water 13. Which property of composites is most affected by the size and number of fillers: Thermal expansion Thermal contraction Polymerization shrinkage Water sorption 14. strain hardening of a metal decreases its proportional limit surface hardness resistance to corrosion strength 15. Mercaptan are a component of: Condensation silicone Polysulphide Addition silicone Polyether 16. A base that is typically placed over a calcium hydroxide base (which has been placed over a pulp exposure); is known as: direct base secondary base indirect base primary base 17. When electroplating an impression with copper the cathode is Distilled water A copper paste or rod Copper sulphate The impression being electroplated 18. each crystal of the polycrystalline metal is termed seed bush grain dendrite 19. the working time of a phosphate investment mix can be increases by increasing the tempperature of the mix mixing time and mixing efficiency liquid /powder ratio all of the above 20. role of flux in soldering is restrict the flow of solder to preheat removes oxide to melt the solder Loading … Question 1 of 20
