Medical MCQs

5099 MCQs  (Page 56 of 510)

The forces that hold atoms together are called_____________?
A. Primary forces
B. Secondary forces
C. Cohesive forces
D. Ionic forces
All of the following statements about the differences between self-polymerizing acrylic resins and heat-cured resins are true EXCEPT______________?
A. The former have a lower molecular weight
B. The former have higher residual monomer content
C. The former are more porous
D. The former have greater transverse strength
If curing occurs at temperature more than 100°C porosity results in which area of denture______________?
A. 1. hard thick central area
B. 2. thin palatal area
C. 3. thin area of flanges
D. 4. porosity is uniformly distributed
Use of dimethyl-P-toluidine is indicated for_______________?
A. Thermal polymerization of acrylic
B. Chemical polymerization
C. Retarding the polymerization reaction
D. To inhibit the action of benzoyl peroxide
Acrylic (cold cure)______________?
A. Melts at 100°c
B. Softens at 100°c
C. Still requires heat for polymerization
D. Produces heat during polymerization
Radio opacity to composite resins is rendered by_______________?
A. Silica glass
B. Organic matrix
C. Barium glass and strontium glasses
D. Fluoride particles