Dental Materials 2
.
- 1.
Copper in amalgam increases?
- A.
Strength
- B.
Hardness
- C.
Corrosion resistance
- D.
Either
Correct Answer
D. Either -
- 2.
Low mercury alloy ratio?
- A.
Reduces creep
- B.
Increases creep
- C.
No effect on creep
- D.
None
Correct Answer
A. Reduces creep -
- 3.
Casting shrinkage of gold alloy is?
- A.
Lesser than base metal alloys
- B.
Greater than base metal alloys
- C.
Neither
- D.
Npne
Correct Answer
A. Lesser than base metal alloys -
- 4.
Finer grain structure is produced by?
- A.
Rapid cooling
- B.
Quenching
- C.
Both
- D.
None
Correct Answer
C. Both -
- 5.
Process of heating a metal to reverse the effects associated with cold working?
- A.
Hardening
- B.
Annealing
- C.
Both
- D.
None
Correct Answer
B. Annealing -
- 6.
Zinc containing alloys?
- A.
Short life span
- B.
Long life span
- C.
No relation with life span
- D.
None
Correct Answer
B. Long life span -
- 7.
Maximum level of occupational exposure of mercury considered safe?
- A.
20 mg/m3
- B.
50mg/m3
- C.
30 mg/m3
- D.
None
Correct Answer
B. 50mg/m3 -
- 8.
Weekest phase in mercury alloy?
- A.
Silver Tin
- B.
Tin Mercury
- C.
Silver Mercury
- D.
Option 4
Correct Answer
B. Tin Mercury -
- 9.
Tin in amalgam ?
- A.
Decreases hardness
- B.
Decreases the strength
- C.
Increases corrosion
- D.
All
Correct Answer
D. All -
- 10.
Main reason for marginal breakdown of restorations?
- A.
Corrosion
- B.
Increased porosity
- C.
Creep
- D.
All
Correct Answer
C. Creep -
- 11.
In electralloy calcium is incorporated for the purpose of ?
- A.
Reduce creep
- B.
Dispersion strengthening
- C.
Age hardening
- D.
All
Correct Answer
B. Dispersion strengthening -
- 12.
Contaminants are removed from the surface of gold foil by
- A.
Quenching
- B.
Annealing
- C.
Hardening
- D.
All
Correct Answer
B. Annealing -
- 13.
Final finishing of amalgam done after ----hours of finishing?
- A.
8 hrs
- B.
6 hrs
- C.
18 hrs
- D.
24 hrs
Correct Answer
D. 24 hrs -
- 14.
Passivating effect is shown by?
- A.
Cobalt
- B.
Chromium
- C.
Nickel
- D.
Molybdenum
Correct Answer
B. Chromium -
- 15.
Ability of a material to sustain a considerable permenant deviation without rupture under compression is called?
- A.
Ductility
- B.
Modulus of elasticity
- C.
Malleability
- D.
None
Correct Answer
C. Malleability -
- 16.
Compared to solid solutions eutectic alloys shows?
- A.
Increased corrosion resistance
- B.
Decreased corrosion resistance
- C.
Both are showing same
- D.
None
Correct Answer
B. Decreased corrosion resistance -
- 17.
For NITI wire important features are ?
- A.
Pseudoelasticity
- B.
Shape memory
- C.
Either
- D.
None
Correct Answer
C. Either -
- 18.
Monomer :polymer ratio in heat cured acrylic?
- A.
1:3
- B.
3:1
- C.
1:4
- D.
1:1
Correct Answer
A. 1:3 -
- 19.
Porosity occuring due to premature termination of flow of molten metal during solidification is?
- A.
Suck back porosity
- B.
Microporosity
- C.
Back pressure porosity
- D.
Subsurface porosity
Correct Answer
A. Suck back porosity -
- 20.
Porosity that occurs due to rapid solidification?
- A.
Subsurface porosity
- B.
Microporosity
- C.
Suck back
- D.
Back pressure porosity
Correct Answer
B. Microporosity -
Quiz Review Timeline +
Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.
-
Current Version
-
Sep 26, 2018Quiz Edited by
ProProfs Editorial Team -
Sep 18, 2018Quiz Created by
Ismayilpkn4
Back to top