Medical MCQs

5099 MCQs  (Page 86 of 510)

Gypsum is used for________________?
A. Impressions
B. Casts
C. Die
D. Casts and dies
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
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
Type I gypsum product is also called_______________?
A. Impression plaster
B. Class i stone / hydrocal
C. Class ii stone/densite
D. Model plaster
Setting of POP is result of______________?
A. Difference in solubility of caso4 ½ h2o + caso4+ 2h2o
B. Reaction between caso4+ 2h2o and water
C. Nucleation and growth of caso4 ½ h2o crystals
D. Reaction between hemihydrate and hihydrate
Gillmore needle is used for_______________?
A. Testing the strength of plaster of paris
B. Evaluating the setting time of plaster of pris
C. Testing the metal hardness
D. Testing the purity of noble metals
Gypsum product having least expansion_____________?
A. Impression plaster
B. Model plaster
C. Stone plaster
D. Die stone
The strength of gypsum prouducts is generally expressed in terms of______________?
A. Tensile strength
B. Wet strength
C. Green strength
D. Compressive strength