The strength of gypsum prouducts is generally expressed in terms of______________?

Related Mcqs:

1. 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

2. 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

3. The strength of a gypsum investment is dependent on_______________?

   A. Carbon content
   B. Silica content
   C. Gypsum
   D. Copper

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

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

5. Modern dental noble metal casting alloys generally have equiaxed fine grain structures because of the incorporation of small amounts of______________?

   A. Chromium
   B. Indium
   C. Irridium
   D. Palladium

6. The ranking of tear strength from the lowest to highest of all impression materials generally is as follows_______________?

   A. Hydrocolloids, silicones, polyether, polysulfide
   B. Silicones, hydrocolloids, polyether, polysulfide
   C. Polysulfide, hydrocolloids, silicones, polyether
   D. Hydrocolloids, polyether, silicones, polysulfide

7. 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

8. 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

9. Type III Dental gypsum is__________________?

   A. Class II stone
   B. Densite
   C. Class I stone or hydrocal
   D. Model or lab plaster

10. Gypsum is used for________________?

    A. Impressions
    B. Casts
    C. Die
    D. Casts and Dies