By increasing the percentage of which metal, the strength and hardness of amalgam increases_____________?

Related Mcqs:

1. Which of the following hardness test is a micro hardness test ?

   A. Brinnel
   B. Knoop
   C. Shore-A
   D. Rockwell

2. High strength amalgam is achieved by_____________?

   A. Maximum matrix and minimum alloy phase
   B. Minimum matrix and maximum alloy phase
   C. Maximum matrix phase
   D. Minimum alloy phase

3. For dental amalgam, the elastic modulus and tensile strength is______________?

   A. 40 Gpa and 60 – 100 Mpa
   B. 21 Gpa and 27 – 55 Mpa
   C. 350 Gpa and 10 – 120 Mpa
   D. 360 Gpa and 125 – 130 Mpa

4. The effect of trituration on strength in an amalgam restoration depends on______________?

   A. Amalgam alloy
   B. Trituration time
   C. Speed of amalgamator
   D. All of the above

5. Amalgam achieves 70% of the strength by____________?

   A. hours
   B. 4 hours
   C. 8 hours
   D. 16 hours

6. Amalgam achieves 70% of the strength by____________?

   A. hours
   B. 4 hours
   C. 8 hours
   D. 16 hours

7. According of ADA specification No or number 1, the minimum compressive strength for silver amalgam filling aftr one hour should be________________?

   A. 80 Mpa
   B. 140 Mpa
   C. 260 Mpa
   D. 510 Mpa

8. In non zinc containing dental amalgam alloy the percentage of zinc present is______________?

   A. Less than 0.02%
   B. Less than 0.1%
   C. Less than 0.01%
   D. None of the above

9. Materials which has high compressive strength and low tensile strength is classified with property of________________?

   A. Ductility
   B. Brittleness
   C. Malleability
   D. Resilient

10. 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