781. The principal hardener in noble metal casting alloys is
A. brass
B. iron
C. silver
D. copper
E. Platinum
782. The color of which of the following metals is not white or one of the shades of white?
A. Nickel
B. Tin
C. Aluminium
D. Zinc
E. None of the above
783. Which of the following may result in the expansion of an amalgam restoration made with zinc freealloys?
A. Moisture contamination during conden-sation
B. High alloy/mercury ratio
C. Marginal leakage
D. Insufficient trituration
E. All of the above
784. Resins which soften when heated and set on cooling, are termed
A.thermoset resins
B. irreversible resins
C thermoplastic resins
D. etastoMeric resins
E. thermosetting resins
785. A compressive stress is always accompanied by
A. an elastic strain
B. a compressive strain
C. a shearing strain
D. a tensile strain
786. Which of the following is true about chemical adhesion of restorative materials?
A. Chemical adhesion to tooth structure is never possible
B. Acid etching of enamel produces chemical adhesion
C. Resins exhibit chemical adhesive properties to hard tooth structure
D. Materials containing fluoride will show chemical adhesion to enamel
E.Polycarboxylate cements demonstrate chemical adhesion
787. When softening impression compound in a water bath, the mass is kneaded with fingers in order to
A. Obtain uniform plasticity throughout the mass
B. Remove incorporated water
C. Release allundesirable stresses
D. Increase flow
E. Prevent the plasticizer from leaching ou
788. Self-cured and heat-cured acrylic res-ins are most similar in respect of which of the following properties?
A. Color stability
B. Curing shrinkage
C. TransversestrengthFCPS Part 1 DentistryRefrence: Vijay Pratab Singh Mcqs in Dentistry
D. Internal porosity
E. Hardness
789. During the setting of gypsum, the mass thickens and then hardens into needle like clusters called
A. spicules
B. crystallites
C. spherulites
D. Satellites
790. Which of the following colloidal solutions can be termed aerosol?
A. Liquid in solid
B. Gas in liquid
C. Liquid in air
D. Solid in liquid
E. None of the above
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