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

Related Mcqs:

1. 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

2. 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

3. Plaster of paris is mixed in________________?

   A. Plastic bowl
   B. Rubber bowl
   C. Glass bowl
   D. Metal bowl

4. The main ingredient in dental plaster in_______________?

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

5. 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

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

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

7. Impression plaster containing potato starch is called______________?

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

8. 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

9. 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

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