A. 1
B. 4
C. 12
D. 25
Related Mcqs:
- 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 - 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 - The American dental association (ADA) specification number for non-aqueous elastomeric dental impression material is______________?
A. 19
B. 20
C. 21
D. 26 - 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 - 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 - 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 - 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 - Which is gypsum product_______________?
A. Stone
B. Plaster
C. Investment
D. All of the above - 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 - Type I gypsum product is also called_______________?
A. Impression plaster
B. Class I stone / Hydrocal
C. Class II stone/Densite
D. Model plaster
