321. Which one of the following impression materials is elastic, sets by a chemical reaction and is catalyzed by chloroplatinic acid_______________?

A. Condensation silicone
B. Polyether
C. Polysulfide
D. Poly vinyl siloxane

322. Which of the following best describes the working time of elastomeric impression material ?

A. After the start of appearing elastic properties of impression material
B. Just after the start of appearing elastic properties of impression material
C. Just before the start of appearing elastic properties of impression material
D. Loss of luster of impression material

323. Final product in alginate is________________?

A. Sodium alginate
B. Potassium alginate
C. Trisodium phosphate
D. Calcium alginate

324. Dustless alginate is produced by______________?

A. Reducing the diatomaceous earth
B. Adding heavy metal salts
C. Coating with dihydric alcohol
D. Altering the matrix

325. Two in one stage impression materials include______________?

A. Zinc Oxide eugenol impression paste
B. Hydrocolloid impression material
C. Elastomeric impression material
D. All of the above

326. A technique of combining reversible and irreversible hydrocolloid that could bond to irreversible hydrocolloid is known as________________?

A. Injecting technique
B. Laminate technique
C. Immersion technique
D. Tempering technique

327. Which of the following impression materials is easy to pour and difficult to remove the stone cast from the impression ?

A. Addition polysilicone
B. Condensation polysilicone
C. Polyether
D. Polysulfide

328. Rough and irregular surface produced on the impression is because of ?

A. Improper application of pressure during impression making
B. Air incorporated during mixing
C. Too rapid polymerization
D. Presence of moisture in impression area

329. The impression materials with lowest viscosity is_____________?

A. Plaster of paris
B. Agar – agar
C. Zinc oxide eugenol
D. Elastomers

330. The ranking of tear strength from the lowest to highest of all impression materials generally is as follows_______________?

A. Hydrocolloids, silicones, polyether, polysulfide
B. Silicones, hydrocolloids, polyether, polysulfide
C. Polysulfide, hydrocolloids, silicones, polyether
D. Hydrocolloids, polyether, silicones, polysulfide