251. Tublulence of molten gold is due to _____________?

A. Impurities in gold
B. Improper venting
C. A and B
D. None of the above

252. In a patient with allergy to costume jewelry, which of the following is contraindicated______________?

A. High gold
B. Low gold
C. Palladium – Ag
D. Ni – Cr

253. Indium in metal alloys_______________?

A. Improve bonding
B. Harden the metal ceramic Ag-Pd alloy
C. Both A and B
D. None of the above

254. Mouth temperature waxes are_______________?

A. Iowa wax
B. Modeling wax
C. Green stick wax
D. None of the above

255. Incomplete casting is the result of_____________?

A. More porous investment in the mould
B. Narrow sprue diameter
C. Hollow sprue pin
D. Large reservoir

256. Glossy smooth margins of a casting are due to_____________?

A. Shrinkage of alloy on cooling
B. Investment breakdown
C. Incomplete wax elimination
D. Incomplete gas elimination

257. Gypsum bonded investment should not be heated over______________?

A. 700°C
B. 1,300°C
C. 1,063°C
D. 900°C

258. Cobalt-Chrominum alloys contains_______________?

A. 30% cobalt and 60% chrominum
B. 60% cobalt and 30% chrominum
C. 1% palladium
D. 20% gold

259. The most commonly used Titanium alloy for dental and medical purposes is________________?

A. Ti 6Al 4V
B. Ti 5Al 4V
C. Ti 5Al 5V
D. Ti 6Al 6V

260. Wax pattern is ideally invested immediately to decrease the dimensional changes caused by_______________?

A. Decrease flow
B. Continuous expansion
C. Relaxation of the internal stresses
D. Water loss

NOTE
IF YOU THINK ANY OF THE MCQ ABOVE IS WRONG.
PLEASE COMMENT WITH CORRECT ANSWER AND ITS DETAIL EXPLANATION IN COMMENT BOX.
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