311. Minimum flow of Type-I impression compound at mouth temperature is___________________?

A. 4%
B. 6%
C. 8%
D. 10%

312. Polysulfide material is routinely not recommended because of_______________?

A. Unpleasant odor and taste
B. Low accuracy
C. Least permanent deformation
D. Highest curing shrinkage

313. Hydrocolloid material, show all except______________?

A. Hysterisis
B. Imbibition
C. Recrytallisation
D. Syneresis

314. Impression material that Do NOT harden by chemical reaction_______________?

A. Zinc oxide eugenol
B. Impression compound
C. Alginate
D. Plaster of paris

315. Putty wash technique_________________?

A. Light body and putty used at the same time
B. Putty used first and light body used second
C. Light body first and putty later
D. None of the above

316. What is the minimum thickness of the elastomeric impression material for an accurate impression_______________?

A. 2 mm
B. 2-4 mm
C. Greater than 3 mm
D. Maximum in the area of operation

317. The relative hardness of elastomere is determined using________________?

A. Rockwell tester
B. Barcol indenter
C. Knoop pyramid
D. Shore durometer

318. Rough surface of elastomeric impression results from_______________?

A. Inadequate mixing
B. Air bubbles
C. Too rapid polymerization
D. Incomplete polymerization caused by premature removal from mouth

319. Most rigid elastomer is___________________?

A. Polyether
B. Polysulphide
C. Addition silicone
D. Condensation silicone

320. Most ideally elastic among the following_______________?

A. Polyether
B. Addition silicone
C. Polysulphide
D. Condensation silicone