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