1. which of the following will form a peritectic alloysilver and tinsilver and coppersilver and palladiumsilver and goldQuestion 1 of 20 2. which orthodontic wire shows shape memoryTMACo-CrNiTia-TiQuestion 2 of 20 3. of the following, most kind to the pulp iszinc phosphateGICsilicate cementspolycarboxylateQuestion 3 of 20 4. hydrocolloid impression material may experience all of the following exceptimbibitionsrecrystallsationhysteresissyneresisQuestion 4 of 20 5. Stiffness is:Relative softness of materialRelative hardness of a materialAbility to be drawn into wiresAbility to resist deformationQuestion 5 of 20 6. in an alginate impression material trisodium phosphate is theretarderacceleratorfillerreactorQuestion 6 of 20 7. Stain removing commercial denture cleanser usually containPotassium perborateSodium hypochloriteSodium perborateSoda ashQuestion 7 of 20 8. Modulus of elasticity/tensile strength of brittle materials is measured byCharpy testDiametrical compresssion test3-point bend testCold bend testQuestion 8 of 20 9. Animal test used to check biocompatibility of dental material is all exceptLD50 testImplantation testbuehlar testAme's testQuestion 9 of 20 10. Maximum flow of Type I inlay wax at 45 degrees:3percent10percent70percent2 percentQuestion 10 of 20 11. Most recent type of denture adhesive isCellulose based saltsAcrylic adhesivesSalts of gontrezNatural gumsQuestion 11 of 20 12. Continues use of vibrator during investing leads to?Surface roughnessSurface irregularitiesDiscolorationRandom nodule formationQuestion 12 of 20 13. role if indium in amalgam isto reduce elease of mercury during masticationto reduce release of mercury during amalgam polishingto reduce formation of gamma phaseto reduce formation of gamma 2 phaseQuestion 13 of 20 14. Which of the following best describes "strain hardening" or "work hardening"?softening a metal at room temperaturehardening (or deformation) of a metal at room temperaturehardening (or deformation) of a metal at a very high temperaturesoftening a metal by controlled heating and coolingQuestion 14 of 20 15. The relative amount of lightness or darkness in a color is referred to as:valuechromahueintensityQuestion 15 of 20 16. In hot and dry environment, alginate shrinks byHysteresisImbibitionAccretionSyneresisQuestion 16 of 20 17. If gold content of the alloy decreases:Strength decreases, ductility increasesStrength increases, ductility decreasesBoth strength and ductility increasesBoth strength and ductility decreasesQuestion 17 of 20 18. 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?polyvinyl siloxanesPolysulfidespolyetherscondensation siliconesQuestion 18 of 20 19. Phosphate bonded investment is made carbon free:To produce smooth castingTo prevent brittleness of alloyTo prevent staining of ceramicFor easier divesting of investmenQuestion 19 of 20 20. Hardening heat treatment for gold copper alloys involvesQuenching immediately after castingHeating to 700 degree C for 10 min followed by quenchingQuenching immediately after recrystallisationHeating to 350 degree C for 15-30 min followed by quenchingQuestion 20 of 20 Loading...
