Plaster of paris is mixed in________________?

Related Mcqs:

1. 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

2. Plaster of paris _____________?

   A. Is wet calcined hemihydrate
   B. Has porous and irregular crystals
   C. Is a – hamihydrate
   D. Has a W / P of 0.2

3. Model plaster (white) used to cast study models before mixing with water, is largely composed of____________?

   A. CaO
   B. CaCO3
   C. (CaSO4)2-½H2O
   D. CaSO4-2H2O

4. 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

5. 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

6. The main ingredient in dental plaster in_______________?

   A. Calcium sulphate hemihydrate
   B. Calcium phosphate
   C. Calcium anhydrate
   D. Calcium sulphate dihydrate

7. Powders of dental plaster and dental stone differ mainly in____________?

   A. Solubility
   B. Shelf life
   C. Chemical formula
   D. Particle porosity

8. Impression plaster containing potato starch is called______________?

   A. Plaster of paris
   B. Soluble plaster
   C. Anti – expansion solution
   D. Die stones

9. The main difference between dental stone and dental plaster is______________?

   A. Chemical composition
   B. Self life
   C. Sharpe and size of particles
   D. Solubility in water

10. Plaster mix____________?

    A. Rapid spatulation results in decreased setting time
    B. 2% potassium sulphate is accelerator
    C. Citrates are retarders
    D. All of the above