B. Custom trays facilitate uniform contraction of impression material

C. Custom trays require less impression material

D. Stock trays may be short in the flange area

A. 50%

B. 25%

D. 100%

B. Reaction between hemihydrate and hihydrate

C. Nucleation and growth of CaSo4 H2O crystals

D. Reaction between CaSO4+ 2H2O and water

A. Acts as plasticizer

C. Acts as a catalyst

D. Helps as surfactant

A. Using excess water for maxing

C. None of the above

D. Lowering the temperature of water used for mixing

A. Improper angulation of sprue

B. Improper heating of the investment

D. Improper casting pressure

B. Gypsum bonded

C. Silica bonded

D. None of the above

A. 0.2

C. 0.05

D. 0.15

A. Stainless steel wire

B. Aluminium

C. TMA wire

A. Boiling

B. Chain lengthening

D. Condensation

B. Adding a drop of water

C. Adding a drop of eugenol

D. Altering ratio of two pastes

B. 15 ml of water to 40 gms of powder

C. 40 ml of water to 40 gms of powder

D. 100 ml of water to 60 gms of powder

A. Silicone

C. Mercaptan

D. Reversible hydrocolloid

A. Reversible hydrocolloid

B. Polysulphide rubber

D. Alginate

A. Light body first and putty later

B. Light body and putty used at the same time

C. None of the above

A. Type 2

C. Type 4

D. Type 3

A. Soft hardening treatment

C. Hard hardening treatment

D. Precipitating heat treatment

A. Preserving the sulci

B. Ease of construction of denture

D. All of the above

B. Zinc acetate

C. CaCl2

D. Alcohol

A. 4%

B. 2%

C. 19%

A. Alginate

B. Plaster of paris

D. Zinc oxide eugenol

A. Polyether

B. Condensation polysilicone

C. Addition polysilicone

A. Unfilled acrylic plastics

C. Zinc phosphate cements

D. Porcelains

B. Acetylene

C. Hydrogen

D. Natural gas

A. Palladium

C. Silver

D. Copper

A. Loss of luster of impression material

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

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

A. More porous investment in the mould

B. Large reservoir

C. Hollow sprue pin

A. Platinum

B. Iridium

D. Ruthinium

A. Solubility in water

C. Chemical composition

D. Self life

A. By condensation of repeated molecules of monomers

B. Polymerization occurs with elimination of single byproduct

C. Condensation does not occur at all

A. Altering the matrix

B. Reducing the diatomaceous earth

D. Adding heavy metal salts

B. Increase the strength of solder

C. It prevents the flow of material in undesirable area

D. It prevents the formation of copper oxide

A. Green strength

B. Tensile strength

D. Wet strength

A. Attached impurities on undersurface of casting

B. No rapid cooling

D. Inadequate melting temperature

A. Heating 750C and slowly cooling to zero degree

B. Heating quickly upto 450C followed by sudden quenching

C. Heating at 750C and then quenching to room temperature

A. Carbon crucible

C. High melting plastic crucible

D. Clay crucible

A. Less water powder ratio

C. Allowing setting under water

D. Increased spatulation

B. 43.5C

C. 65C

D. 100C

A. Zinc oxide-eugenol

B. Agar-agar

D. Impression compound

A. Nickel

B. Chromium

D. Carbon

A. 4

C. 1

D. 12

B. Silane group

C. Marcaptan group

D. Virryl group

A. Air incorporated during mixing

C. Presence of moisture in impression area

D. Improper application of pressure during impression making

A. Micro porosity

B. Pinhole porosity

C. Gas inclusion porosity

A. Gold solder and borax flux

C. Silver Solder and borax flux

D. Gold solder and fluoride flux

B. Increasing the mould metal temperature difference

C. Increasing the flow of molten metal

D. All of the above

A. Reduced contamination by saliva

B. Reduced dimensional instability

C. Improved adhesion of the impression to the tray

A. Free flowing wax

B. Reversible hydrocolloids

D. Zinc oxide eugenol impression paste

A. Addition silicone

B. Alginate

C. Condensation silicone

A. Zinc Oxide eugenol impression paste

C. Hydrocolloid impression material

D. All of the above