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.Management Sciences
Category: Gypsum Products
The most commonly used accelerator in gypsum product is___________________?
A. Sodium fluoride
B. Potassium fluoride
C. Potassium sulfate
D. Aluminium sulfate
The strength of the gypsum specimen when the water in excess of that required for the hydrate of the hemihydrate is left in the specimen is called____________?
A. Dry strength
B. Green strength
C. Water strength
D. Compressive strength
Type III Dental gypsum is__________________?
A. Class II stone
B. Densite
C. Class I stone or hydrocal
D. Model or lab plaster
Water powder ratio of dental stone and plaster is respectively_________________?
A. 0.28 and 0.6
B. 0.6 and 0.28
C. 0.6 and 3.2
D. 0.28 and 0.98
Impression plaster containing potato starch is called______________?
A. Plaster of paris
B. Soluble plaster
C. Anti – expansion solution
D. Die stones
Beta hemihydrate particles absorb______________?
A. More water
B. Less water
C. no water
D. None of the above
Green strength with reference to plaster means_____________?
A. Dry strength
B. Compressive strength
C. Strength of dental stone due to green colour
D. The wet strength
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 porous
C. They are more irregular in shape and porous
D. They are more dense and prismatic in shape
In plaster of paris the setting time is primarily altered by_________________?
A. Altering P / L Ratio
B. Altering temperature of mixing water
C. Speed and length of hand spatulation
D. Addition of accelerators and retarders
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