Up To Date Gymsum Products ( Dental Materials ) MCQs – Medical MCQs
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Latest Medical MCQs
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Latest Gymsum Products ( Dental Materials ) Mcqs
The most occurred mcqs of Gymsum Products ( Dental Materials ) in past papers. Past papers of Gymsum Products ( Dental Materials ) Mcqs. Past papers of Gymsum Products ( Dental Materials ) Mcqs . Mcqs are the necessary part of any competitive / job related exams. The Mcqs having specific numbers in any written test. It is therefore everyone have to learn / remember the related Gymsum Products ( Dental Materials ) Mcqs. The Important series of Gymsum Products ( Dental Materials ) Mcqs are given below:
Plaster mix____________?
A. Rapid spatulation results in decreased setting time
B. Citrates are retarders
C. 2% potassium sulphate is accelerator
D. All of the above
A rough / Chalky surface of the cast is due to_______________?
A. High speed accelerator
B. Not waiting for 20 min before pouring
C. Air incorporation in the mix
D. All of the above
The setting expansion of gypsum products can be reduced by________________?
A. Less water powder ratio
B. Adding potassium sulfate
C. Increased spatulation
D. Allowing setting under water
Most commonly used retarder in gypsum_____________?
A. Nacl
B. Na2 So4
C. Citrales
D. K2 So4
Gypsum product having least expansion_____________?
A. Model plaster
B. Impression plaster
C. Stone plaster
D. Die stone
Gillmore needle is used for_______________?
A. Testing the metal hardness
B. Evaluating the setting time of plaster of pris
C. Testing the strength of plaster of paris
D. Testing the purity of noble metals
Setting of POP is result of______________?
A. Difference in solubility of CaSo4 ½ H2O + CaSO4+ 2H2O
B. Nucleation and growth of CaSo4 ½ H2O crystals
C. Reaction between CaSO4+ 2H2O and water
D. Reaction between hemihydrate and hihydrate
Type I gypsum product is also called_______________?
A. Impression plaster
B. Class II stone/ Densite
C. Class I stone / Hydrocal
D. Model plaster
Plaster of paris _____________?
A. Is a – hamihydrate
B. Has porous and irregular crystals
C. Is wet calcined hemihydrate
D. Has a W / P of 0.2
Impression Materials MCQs
As per DNA No. 25, minimum amount of setting expansion required for type V gypsum products_______________?
A. 0.15
B. 0.10
C. 0.05
D. 0.20
The main difference between dental stone and dental plaster is______________?
A. Self life
B. Chemical composition
C. Sharpe and size of particles
D. Solubility in water
Gypsum is used for________________?
A. Casts
B. Impressions
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____________?
A. Water strength
B. Green strength
C. Dry strength
D. Compressive strength
Balanced stone is dental stone_______________?
A. In which the crystals are all of uniform size
B. In which accelerators or retarders have been added according to need
C. In which amount of water of hydration is controlled
D. Which undergoes rapid expansion
Impression plaster containing potato starch is called______________?
A. Anti – expansion solution
B. Soluble plaster
C. Plaster of paris
D. Die stones
Powders of dental plaster and dental stone differ mainly in____________?
A. Shelf life
B. Solubility
C. Chemical formula
D. Particle porosity
Beta hemihydrate particles absorb______________?
A. More water
B. no water
C. Less water
D. None of the above
Type III Dental gypsum is__________________?
A. Densite
B. Class II stone
C. Class I stone or hydrocal
D. Model or lab plaster
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. Calcium sulphate dihydrate
C. Beta – hemihydrates
D. Orthorhombic anhydrate
The strength of gypsum products is generally expressed in terms of______________?
A. Tensile strength
B. Green strength
C. Wet strength
D. compressive strength
The function of 2% potassium sulphate in a gypsum product is_____________?
A. Acts as retarder
B. Regulate setting time
C. To regulate the setting expansion
D. None
Finer particle size of silica______________?
A. Normal setting expansion
B. Greater the hygroscopic expansion
C. Slower the hygroscopic expansion
D. No setting expansion
ADA specification number of gypsum products are described under____________?
A. 4
B. 1
C. 12
D. 25
Metallurgy MCQs
Modiffiers are added to gypsum mainly to_______________?
A. Modify setting time
B. Modify strength
C. Modify setting expansion
D. Decrease the porosity
Placing cast under tap water is to be avoided as______________?
A. H2O inhibits polymerization of dental resin
B. H2O interferes with hygroscopic expansion
C. H2O interferes with Crystallization of dihydrate
D. Gypsum is slightly soluble in water and the surface of the cast will be eroded
The β (Beta) hemihydrate of gypsum requires more water to float its powder particles because______________?
A. They are more regular in shape and highly porous
B. They are more regular in shape and dense
C. They are more irregular in shape and porous
D. They are more dense and prismatic in shape
In plaster of paris the setting time is primarily altered by_________________?
A. Altering temperature of mixing water
B. Altering P / L Ratio
C. Speed and length of hand spatulation
D. Addition of accelerators and retarders
Which is gypsum product_______________?
A. Plaster
B. Stone
C. Investment
D. All of the above
The most commonly used accelerator in gypsum product is___________________?
A. Potassium fluoride
B. Sodium fluoride
C. Potassium sulfate
D. Aluminium sulfate
The hygroscopic technique is associated with______________?
A. Investment
B. Amalgam
C. Hydrocolloids
D. Silicate
Accelerators and retarders are used with gypsum products mainly to control_______________?
A. Setting time
B. Hardness of the set product
C. Setting expansion
D. None of the above
The main ingredient in dental plaster in_______________?
A. Calcium sulphate hemihydrate
B. Calcium anhydrate
C. Calcium phosphate
D. Calcium sulphate dihydrate
Die is________________?
A. Impression of whole teeth
B. Impression of single tooth
C. Replica of single tooth
D. Replica of whole teeth
Plaster of paris is mixed in________________?
A. Glass bowl
B. Rubber bowl
C. Plastic bowl
D. Metal bowl
Dental Cements MCQs
Water of reaction needed to react completely with 100 g of calcium sulphate hemihydrates to convert it to calcium sulphate dihydrate______________?
A. 18.6ml
B. 30.4ml
C. 22.2ml
D. 45.3ml
Green strength with reference to plaster means_____________?
A. Compressive strength
B. Dry strength
C. Strength of dental stone due to green colour
D. The wet strength
Water powder ratio of dental stone and plaster is respectively_________________?
A. 0.28 and 0.6
B. 0.6 and 3.2
C. 0.6 and 0.28
D. 0.28 and 0.98
Model plaster (white) used to cast study models before mixing with water, is largely composed of____________?
A. CaCO3
B. CaO
C. (CaSO4)2-½H2O
D. CaSO4-2H2O