1. The ratio of transverse contraction strain to longitudinal extension strain in the direction of stretching force is known as Shear stress Compressive stress Poissons ratio Tensile stress 2. 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 is corrosion resistant Martensite form is very brittle Martensite form has less strength 3. The phenomenom where porcelain appears different under varying light conditions is Regractive optics Transmittance Metamerism Opacification 4. Stiffness is related to? Resistance to elastic deformation Degree of plastic resistance Resistance to plastic deformation Degree of elastic resistance 5. Bond strength required to counteract the effect of polymerization shrinkage in composite resins: 17 MPa 21 MPa 56 MPa 7 MPa 6. Effects associated with cold working i.e lowered ductility and distorted grains can be eliminated by process known as Strain hardening Annealing Eutectic Concentricity 7. the most important mechanical property involved when a base metal partial denture clasp is adjusted is tensile strength elastic imit elongation hardness 8. which of the following will form a peritectic alloy silver and gold silver and palladium silver and copper silver and tin 9. which cement has the highest modulus of elasticity zinc phosphate zinc polyreinforced ZOE zinc polycaroxylate glass ionomer cement 10. Best cementing medium for self retained all ceramic crown is Dual cure resin RMGIC Chemical cure resin GIC 11. A base that is typically placed over a calcium hydroxide base (which has been placed over a pulp exposure); is known as: primary base secondary base direct base indirect base 12. Hardness of which material is more than enamel: Composite Ceramic Gold Amalgam 13. By product of setting reaction of condensation silicon: Hydrogen Water Ethyl alcohol Acetone 14. Hysteresis, the phenomenon of sol-gel conversion of a reversible hydrocolloid ,is dependent upon Water content Addition of modifiers Chemical reaction of constituents Temperature 15. porcelain are made opaque by the addition of oxides of titanium and tin nickel and iridium boron and magnesium iron and aluminium 16. most common reason for incomplete casting when using a centrifugal casting machine is increased porosity of the investment hollow space narrow sprue large reservoir 17. Polishing agent which is known as whitening agent Iron oxide Rouge Chromium oxide None of the above 18. highest water solubility is seen in zinc oxide eugenol zinc phosphate zinc polycarboxylate zinc silicophosphate 19. an amalgam is an alloy of two or more metals one of whose consituent is silver one of those whose constituent is mercury of silver and tin 20. If multiple firing is done to opaque layer of dental porcelain, then it becomes? Too Smooth Too glazed Become more opaque Cracked Loading … Question 1 of 20
