A. Back pressure porosity

B. Micro porosity

C. Pin hole porosity

A. Phenomenon of conversion of gel into sol

C. Moisture absorption

D. All of the above

B. Phosphoric acid

C. Sulphuric acid

D. Nitric acid

A. Increase toughness

B. To provide a smooth and glossy surface

C. Decrease toughness

A. High melting plastic crucible

B. Clay crucible

D. Carbon crucible

A. Recrystallization recovery, grain growth

B. Grain Growth Recrystallization recovery

D. Melting point, grain growth, Recrystallization

A. 11.5-12.510-6/C

C. 10.5-11.510-6/C

D. 16.5-17.510-6/C

A. Elastomers

C. Zinc oxide eugenol

D. Agar agar

A. Knoop pyramid

B. Rockwell tester

C. Barcol indenter

B. Zinc oxide eugenol paster

C. Polysulphide

D. Silicone

A. Water loss

B. Decrease flow

D. Continuous expansion

A. 240 Mpa

B. 100 Mpa

D. 700 Mpa

A. Liquid

B. Solid

C. Gas

A. Silicone impression material

B. Reversible hydrocolloid

C. Impression plaster

A. Degradation is presence of moisture

B. High flow property

C. Remain distortion free up to 72 hrs. pouring can be safely delayed

A. Custom trays facilitate uniform contraction of impression material

B. Custom trays require less impression material

D. Stock trays may be short in the flange area

A. 0.2

B. 0.15

D. 0.05

A. Ionic copper

C. Copper cynide

D. Silver cyanide

A. Impression paste

B. Silicon impression material

D. Impression plaster

A. Zinc oxide-eugenol

B. Impression compound

D. Agar-agar

A. Retarder

C. Modifier

D. Plasticier

B. Condensation silicones

C. polysulfides

D. addition silicones

A. Increase the strength of solder

C. It prevents the formation of copper oxide

D. It prevents the flow of material in undesirable area

B. 2% sodium sulfate

C. 0.2% Potassium sulfate

D. 4% Potassium sulfate

A. Canadelila

B. Carnauba

D. Paraffin

A. Least permanent deformation

C. Low accuracy

D. Highest curing shrinkage

A. Gelatin

B. alginate

C. Alginic acid

A. Help polish cast restorations

B. Reproduce fine detail

D. Eliminate air bubbles on the wax pattern

A. Hydrogen

B. Natural gas

C. Acetylene

A. To felicitate mixing investment

B. To felicitate wetting of ring liner

C. For better wax elimination

A. 2 mm

C. Greater than 3 mm

D. 2-4 mm

A. All of the above

C. Zinc Oxide eugenol impression paste

D. Hydrocolloid impression material

A. Model or lab plaster

C. Densite

D. Class II stone

A. 5 to 10%

B. <1%

C. 2 to 3%

A. Agar

C. Alginate

D. Zno paste

A. To strength amalgam

B. To replace internal gold restorations

C. To construct clasps for partial dentures

A. Surface hardness

B. Proportion limit

C. Strength

B. Zinc phosphate cements

C. Porcelains

D. Unfilled acrylic plastics

A. Prevent distortion

B. Prevent syneresis

D. Increase gel strength

A. Eugenol content

C. Their use

D. Water content

A. Acts as an accelerator

B. Initiating the setting reaction

D. Provides gel strength

A. Loss of luster of impression material

C. After the start of appearing elastic properties of impression material

D. Just after the start of appearing elastic properties of impression material

A. Hydrocolloids, polyether, silicones, polysulfide

C. Silicones, hydrocolloids, polyether, polysulfide

D. Polysulfide, hydrocolloids, silicones, polyether

B. Impression plaster

C. Rubber base impression material

D. Alginate

A. They exhibit a very low setting shrinkage

B. They evolve hydrogen when cast if they are not fully cured

D. They have a lower tear resistance than polysulphide rubbers

A. High gold

B. Low gold

C. Palladium Ag

A. Natural gas

C. Acetylene

D. Hydrogen

B. Retained cement in gingival sulcus

C. Supracocclusion of restoration

D. Excess acid in mix

A. Magnesium oxide & Phosphate

B. Magnesium oxide & Ortho Phosphoric acid

C. Magnesium oxide & Phosphoric acid

A. Impression plaster

B. Metallic oxide paste

C. Irreversible hydrocolloid