The function of 2% potassium sulphate in a gypsum product is_____________? A. To regulate the setting expansionB. Regulate setting time C. Acts as retarder D. None

Finer particle size of silica______________? A. Slower the hygroscopic expansionB. Greater the hygroscopic expansion C. Normal setting expansion D. No setting expansion

ADA specification number of gypsum products are described under____________? A. 1 B. 4 C. 12D. 25

Modiffiers are added to gypsum mainly to_______________? A. Modify setting time B. Modify setting expansion C. Modify strength D. Decrease the porosity

Placing cast under tap water is to be avoided as______________? A. H2O interferes with hygroscopic expansion B. H2O inhibits polymerization of dental resin C. H2O interferes with Crystallization of dihydrateD. Gypsum is slightly soluble in water and the surface of…

The β (Beta) hemihydrate of gypsum requires more water to float its powder particles because______________? A. They are more regular in shape and dense B. They are more regular in shape and highly porousC. They are more irregular in shape…

Which is gypsum product_______________? A. Stone B. Plaster C. InvestmentD. All of the above

The most commonly used accelerator in gypsum product is___________________? A. Sodium fluoride B. Potassium fluorideC. Potassium sulfate D. Aluminium sulfate

The hygroscopic technique is associated with______________? A. Investment B. Hydrocolloids C. Amalgam D. Silicate

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