741.Which of the following tests is not included in the intermediate or secondary test for biocompatibility of dental materials
C.Mucous membrane irritation test
D.None of the above
742.Microleakage results in
D.All of the above
743.First screening test used for dental materials
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
746.Knoop hardness number of which of the following material is closest to dentin (KHN-70)
747.No wetting occurs at a contact angle of
B.Intensity of colour
D.Darkness or lightness
749.The modulus of elasticity is an indication of what propertyof a material?
750. The limited shelf-life of condensation silicones is usually the result of deterioration of which of the following components ?
B. Tin component
D. Platinum salt