In type II gold alloys _______ Karat gold is used?

Related Mcqs:

1. The castability of chromium-cobait base metal alloys when compared to gold based noble metal alloys is_______________?

   A. More
   B. Less
   C. Equal
   D. Depends on the alloy type

2. Reduction in the fusion temperature of dental gold casting alloys is caused by presence of______________?

   A. Platinum
   B. Copper
   C. Silver
   D. Gold

3. Nickel is added to wrought gold alloys as______________?

   A. Strengtherner
   B. Hardener
   C. Whitens the alloy
   D. Scavenger

4. Which of the following cast gold alloys is used for fabricating partial denture frameworks______________?

   A. Type I – Soft
   B. Type II – Hard
   C. Type III – Hard
   D. Type IV – Extra Hard

5. The gold alloys used for casting contain at least…. percent of precious metal according to ADA specification number 5________________?

   A. 55
   B. 65
   C. 75
   D. 85

6. Which of the following physical property can be used to estimate indirectly the proportional limit of gold alloys ?

   A. Vickers’s hardness number
   B. Knoop hardness number
   C. Brinell hardness number
   D. Rockwell hardness number

7. The linear solidification shrinkage of Type IV Ni-Cr based alloys is_______________?

   A. 2.3%
   B. 1.56%
   C. 1.37%
   D. 3%

8. Greening occuring when porcelains are fired on silver free alloys may be attributed to________________?

   A. Vaporization of silver from the walls of contaminated furnaces
   B. Surface diffusion of silver from the marginal metal
   C. More rapid silver diffusion in sodium containing glass
   D. Silver ionization by porcelains with high oxygen potential

9. Crucible indicated for casting base metal alloys is______________?

   A. Carbon crucible
   B. Clay crucible
   C. Quartz crucible
   D. High melting plastic crucible

10. The term ordered hardening heat treatment used in which of the following dental alloys ?

    A. Gold-Copper
    B. Nickel-Chromium
    C. Nickel-Titanium
    D. Silver-Palladium