Medical MCQs

5099 MCQs  (Page 67 of 510)

In Base metal alloys, Corrosion resistance occurs due to___________________?
A. Passivity
B. High fusion temperature
C. High molecular weight
D. Co-efficient of thermal expansion
Fins and spines on the casting is seen due to_______________?
A. Prolonged heating:
B. Rapid heating me
C. Water film contamination
D. Too high pressure during casting
Solder and flux used for joining Elgiloy wires are_____________?
A. Gold solder and borax flux
B. Gold solder and fluoride flux
C. Silver solder and borax flux
D. Silver solder and fluoride flux
Annealing is also known as_______________?
A. Soft hardening treatment
B. Hard hardening treatment
C. Precipitating heat treatment
D. Stress relieving heat treatment
Quartz is added to gypsum bonded investment to______________?
A. Increase the strength
B. Counter balance contraction of gypsum during heating
C. Aid in hygroscopic expansion
D. Increase the shelf life of investment
Linear coefficient of thermal expansion of metal used for metal caramic restoration range from________________?
A. 11.5-12.5×10-6/°c
B. 10.5-11.5×10-6/°c
C. 13.5-14.5×10-6/°c
D. 16.5-17.5×10-6/°c