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____________?

Related Mcqs:

1. 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

2. 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

3. Beta hemihydrate particles absorb______________?

   A. More water
   B. Less water
   C. no water
   D. None of the above

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

   A. Tensile strength
   B. Wet strength
   C. Green strength
   D. compressive strength

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

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

6. As per DNA No. 25, minimum amount of setting expansion required for type V gypsum products_______________?

   A. 0.05
   B. 0.10
   C. 0.15
   D. 0.20

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

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

8. 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

9. Modiffiers are added to gypsum mainly to_______________?

   A. Modify setting time
   B. Modify setting expansion
   C. Modify strength
   D. Decrease the porosity

10. Type III Dental gypsum is__________________?

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