ADA specification number of gypsum products are described under____________?

Related Mcqs:

1. The ADA specification No 1 for composition of amalgam alloy recommends______________?

   A. 65% silver, 32% tin and 3% copper
   B. 49% silver, 32% tin and 19% cooper
   C. 65% silver, 29% tin and 5-6% copper
   D. None of the above

2. 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

3. The American dental association (ADA) specification number for non-aqueous elastomeric dental impression material is______________?

   A. 19
   B. 20
   C. 21
   D. 26

4. 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

5. The product, which is obtained by calcining gypsum under steam pressure at 120-130°C or by dehydrating gypsum in the presence of sodium succinate is_______________?

   A. Alpha – hemihydrates
   B. Beta – hemihydrates
   C. Calcium sulphate dihydrate
   D. Orthorhombic anhydrate

6. Accelerators and retarders are used with gypsum products mainly to control_______________?

   A. Setting time
   B. Setting expansion
   C. Hardness of the set product
   D. None of the above

7. The setting expansion of gypsum products can be reduced by________________?

   A. Increased spatulation
   B. Adding potassium sulfate
   C. Less water powder ratio
   D. Allowing setting under water

8. Which is gypsum product_______________?

   A. Stone
   B. Plaster
   C. Investment
   D. All of the above

9. The function of 2% potassium sulphate in a gypsum product is_____________?

   A. To regulate the setting expansion
   B. Regulate setting time
   C. Acts as retarder
   D. None

10. Type I gypsum product is also called_______________?

    A. Impression plaster
    B. Class I stone / Hydrocal
    C. Class II stone/Densite
    D. Model plaster