741.Which of the following tests is not included in the intermediate or secondary test for biocompatibility of dental materials
A.Systemic toxicity
B.Inhalation toxicity
C.Mucous membrane irritation test
D.None of the above

742.Microleakage results in
A.Secondary caries
B.Discolouration
C.Sensitivity
D.All of the above

743.First screening test used for dental materials
A.Toxicity
B.Inflammation
C.Allergy
D.Mutagenicity

744.All of the following are characteristics of eutectic alloys, except?
A. The temperature at which eutectic occurs is lower than the fusiontemperature of either constituents
B. they are generally brittle
C. alloy solidifies at a constant temperature
D. components exhibit complete solid solution but limited liquid solubility
E. none of the above

745.Hardness of which does not depend on ductility of metal
A.KHN
B.VHN
C.RHN
D.BHN

746.Knoop hardness number of which of the following material is closest to dentin (KHN-70)
A.Enamel
B.Cementum
C.Amalgam
D.Porcelain

747.No wetting occurs at a contact angle of
A.90 degrees
B.0 degrees
C.180 degrees
D.0-90 degrees

748.Chroma is
A.Translucency
B.Intensity of colour
C.Value
D.Darkness or lightness

749.The modulus of elasticity is an indication of what propertyof a material?
A.Resilience
B.Strength
C.Stiffness
D.Tension

750. The limited shelf-life of condensation silicones is usually the result of deterioration of which of the following components ?
A. Lithopone
B. Tin component
C.Diurethyl siloxane
D. Platinum salt

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