Most commonly used retarder in gypsum_____________?
A. Na2 So4
B. Nacl
C. Citrales
D. K2 So4
Medical Mcqs
Gypsum product having least expansion_____________?
Gypsum product having least expansion_____________?
A. Impression plaster
B. Model plaster
C. Stone plaster
D. Die stone
Gillmore needle is used for_______________?
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
Setting of POP is result of______________?
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
Type I gypsum product is also called_______________?
Type I gypsum product is also called_______________?
A. Impression plaster
B. Class I stone / Hydrocal
C. Class II stone/Densite
D. Model plaster
Plaster of paris _____________?
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
As per DNA No. 25, minimum amount of setting expansion required for type V gypsum products_______________?
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
The main difference between dental stone and dental plaster is______________?
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
Gypsum is used for________________?
Gypsum is used for________________?
A. Impressions
B. Casts
C. Die
D. Casts and Dies
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____________?
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