Nickel is added to wrought gold alloys as______________?

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. In type II gold alloys _______ Karat gold is used?

   A. 24 K
   B. 22 K
   C. 18 K
   D. 10 K

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

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

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 deoxidizing agent added to dental alloys is______________?

   A. Palladium
   B. Silver
   C. Copper
   D. Zinc

8. The rapid decrease in tensile strength and increase in ductility of a wrought metal is seen in which stage of annealing ?

   A. Recovery stage
   B. Recrystallisation stage
   C. Grain growth stage
   D. All of the above

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

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