921. The typical recommended W/P ratio for Type IV stone is?
A. 0.30 to 0.35
B.0.20 to 0.25
C.0.45 to 0.55
D.0.10 to 0.15

922. Impression plaster?
A. will produce less mucosal displacement than alginate
B.should not be used with an anti-expansion solution
C.should be poured immediately on removal from the mouth without any further treatment
D.is always white in colour

923. The percentage of filler (by weight) in conventional composite resins la usually?
A.less than 35%,
B.10 -15%
C. more than 60%
D. more than 30%

924. Incorporation of synthetic resins and orthoethoxy benzoic acid into conventional zinc oxide-eugenol cements will?
A. decrease solubility
B.increase adhesive capability
C.decrease strength
D.decrease film thickness

925. Which of the following terms is different from the others?
A. Yield strength
B.Proportional limit
C.Elastic limit
D.Young’s modulus
E.None of the above

926. The high copper dispersion type amalgam alloys are characterized by all of the following, except?
A. less marginal breakdown
B.low creep
C.little or no gamma-2 phase present in set amalgam
D.little or no gamma phase in set amalgam
E.none of the above

927. The liquid for zinc phosphate cements contains all of the following, except?
A. sulfuric acid
C.aluminium phosphate
D.phosphoric acid

928. The stone cast should be constructed within the first 30 minutes of removal of an elastomeric impression from the mouth. This time interval is not critical for?
B.addition silicones
C.condensation silicones
D.all of the above
E.none of the above

929. Hydroquinone, added to the resin monomer, acts as?
A. an inhibitor
B.an accelerator
C.a polymerization agent
D.a cross-linking agent
E.a catalyst

930. The filler concentration (by weight) in micro-filled composites is?
C. more than 75%

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