8701. Dendrites in cst alloys form by mechanism of_________________?
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A. Constitutional supergriting

B. Constitutional superconductivity

C. Constitutional supercooling

D. Constitutional supergraining

8702. Which of the following component acts as an accelerator in ZOE impression paste ?
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A. Zinc Sulphate & Zinc chloride

B. Zinc Sulphate & Eugenol

C. Glycerin

D. Zinc chloride & Eugenol

8703. Fins and spines on the casting is seen due to_______________?
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A. Too high pressure during casting

B. Prolonged heating:

C. Water film contamination

D. Rapid heating me
8704. Gases dissolved in molten metals are liberated when cooled giving rise to________________?
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A. Gas inclusion porosity

B. Suckback porosity

C. Microporosity

D. Localized shrinkage porosity

8705. K2SO4 in agar-agar is for_______________?
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A. Increase strength

B. Accelerating the setting stage of gypsum

C. Give dimensional stability

D. None of the above

8706. Plaster mix____________?
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A. All of the above

B. Rapid spatulation results in decreased setting time

C. Citrates are retarders

D. 2% potassium sulphate is accelerator

8708. Best material for duplicating cast is_______________?
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A. Plaster of paris

B. Alginate

C. Agar-agar

D. Zinc oxide eugenol

8709. Addition of large amounts of platinum to a casting gold alloy will________________?
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A. Redden the alloy

B. Decrease its tarnish resistance

C. Increase its fusion temperature

D. Decrease its strength and ability to be hardened

8710. Alginates are_____________?
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A. Colloid

B. Hydrocolloid

C. Gel

D. Sol

8711. Softening heat treatment of alloy increases_________________?
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A. Ductility

B. Hardness

C. Tensile strength

D. Proportional limit

8712. Which is the use of boxing an impression______________?
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A. All of the above

B. Ease of construction of denture

C. Ease of pouring an impression

D. Preserving the sulci

8713. Final product in alginate is________________?
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A. Potassium alginate

B. Trisodium phosphate

C. Calcium alginate

D. Sodium alginate

8715. Gillmore needle is used for_______________?
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A. Evaluating the setting time of plaster of pris

B. Testing the purity of noble metals

C. Testing the strength of plaster of paris

D. Testing the metal hardness

8716. Which of the following impression material requires a hardener ?
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A. Impression compound

B. Alginate

C. Agar

D. Elastomers

8719. The most commonly used accelerator in gypsum product is___________________?
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A. Potassium fluoride

B. Aluminium sulfate

C. Sodium fluoride

D. Potassium sulfate
8720. In reversible hydrocolloid the property by which the transformation from sol to gel and gel to sol is a function of the_____________?
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A. Concentration of potassium sulphate

B. Concentration of filler and plasticizer

C. Percentage composition by weight of water

D. Temperature
8721. Rough and irregular surface produced on the impression is because of ?
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A. Improper application of pressure during impression making

B. Presence of moisture in impression area

C. Air incorporated during mixing

D. Too rapid polymerization
8722. Suck back porosity in the casting can be eliminated by________________?
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A. Increasing the mould metal temperature difference

B. Flaring the point of the sprue attachment

C. All of the above

D. Increasing the flow of molten metal

8723. Most commonly used retarder in gypsum_____________?
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A. K<sub>2</sub> So<sub>4</sub>

B. Citrales

C. Na2 So4

D. Nacl

8728. The hygroscopic technique is associated with______________?
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A. Hydrocolloids

B. Silicate

C. Investment

D. Amalgam

8729. Advantage of titanium over other base metal alloys_______________?
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A. Low weight

B. Low melting point

C. Low cost

D. Low strength

8730. Lenolin is added is ZOE paste to______________?
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A. Accelerate reaction

B. Decrease irritation due to eugenol

C. Decrease flow

D. Increase flow
8731. Inelastic impression material is_____________?
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A. Alginate

B. Impression compound

C. Agar-agar

D. Polyether

8733. Rough and irregular surface produced on the impression is because of_______________?
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A. Due to improper ratio of polymer and monomer

B. Air incorporated during mixing

C. Presence of excessive saliva in impression area

D. Improper application of pressure during impression making

8734. Tear strength for impression material is highest for__________?
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A. Alginate

B. Condensation silicone

C. Polysulfide

D. Addition silicone

8735. Gelation temparature of agar is between________________?
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A. 20C to 25C

B. 27C to 33C

C. 37C to 50C

D. 55C to 60C

8738. In Base metal alloys, Corrosion resistance occurs due to___________________?
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A. High Fusion Temperature

B. Co-efficient of Thermal Expansion

C. Passivity

D. High Molecular Weight

8739. Gypsum is used for________________?
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A. Casts

B. Casts and Dies

C. Impressions

D. Die

8740. The strength of gypsum prouducts is generally expressed in terms of______________?
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A. Green strength

B. compressive strength

C. Tensile strength

D. Wet strength

8741. The advantage of ZOE impression paste_______________?
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A. Is easy manipulation

B. Has dimensional stability

C. Does not require special trays

D. Does not adhere to tissues

8742. Alginate impression material is________________?
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A. Non-elastic impression material

B. More mucostatic than ZOE

C. Less mucostatic than ZOE

D. Thermoplastic impression material

8744. Waxes are used for_______________?
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A. Corrective impressions

B. Primary impression

C. Impression of single tooth

D. None of the above

8745. The function of 2% potassium sulphate in a gypsum product is_____________?
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A. Regulate setting time

B. To regulate the setting expansion

C. None

D. Acts as retarder

8746. The main ingredient of inlay wax is__________________?
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A. Carnauba wax

B. Candellila wax

C. Paraffin wax

D. Gum dammar

8747. The impression with the least dimensional change upon disinfection is_______________?
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A. Polysulphide

B. Agar-agar

C. Addition poly silicone

D. Polyether

8749. Nickel-Titanium alloy has__________________?
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A. Unreliable spring back

B. Minimal spring back

C. None of the above

D. low spring back

8750. Syneresis seen in hydrocolloid gel is______________?
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A. Shrinkage

B. Gelation

C. Water absorption

D. Seen as water loss