Metallurgy Mcqs
Q.1: All of the following statements about cast cobalt alloy are true EXCEPT_____________?U
A. They have a modulus of elasticity twice that of gold alloys;
B. They are more rigid than gold alloys$
C. They have higher ductility than gold alloys+
D. They have a lower proportional limit than gold alloys5
Q.2: Addition of large amounts of platinum to a casting gold alloy will________________?S
A. Decrease its strength and ability to be hardened0
B. Decrease its tarnish resistance
C. Increase its fusion temperature
D. Redden the alloy
Q.3: Gap between true end of casting ring and wax pattern should be______________?M
A. inch
B. inch
C. 3/8 inch
D. one inch
Q.4: Which is the use of boxing an impression______________?7
A. Ease of construction of denture
B. Preserving the sulci
C. Ease of pouring an impression
D. All of the above
Q.5: Resistance to corrosion in a cobalt-chrome casting is due to presence of_______________?X
A. High quality iron
B. Chrome
C. Cobalt
D. Nickel
Q.6: Flux is used during casting to________________?/
A. Remove the oxides formed on the gold alloy*
B. Lower the melting point
C. Replace casting wax
D. Speed the burnout process
Q.7: The maximum carbon content of steel used in dentistry is__________________?K
A. 19%
B. 2%
C. 1.7%
D. 4%
Q.8: Wax pattern is ideally invested immediately to decrease the dimensional changes caused by_______________?i
A. Decrease flow
B. Continuous expansion
C. Relaxation of the internal stresses#
D. Water loss
Q.9: The most commonly used Titanium alloy for dental and medical purposes is________________?Y
A. Ti 6Al 4V
B. Ti 5Al 4V
C. Ti 5Al 5V
D. Ti 6Al 6V
Q.10: Cobalt-Chrominum alloys contains_______________?0
A. 30% cobalt and 60% chrominum
B. 60% cobalt and 30% chrominum
C. 1% palladium
D. 20% gold

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