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ENGINEERING 250EXAM IIIDecember 21, 2009Honor Code:I have neither given nor received aid on this exam.Signature(Print your name)Check Recitation SectionSection___00111:30___0021:50___0033:00Part A-Closed Book and Closed Notes. (60 points)There are 20 questions below. The first 10 questions are true or false which require amark of T or F. Questions 11-20 are multiple choices. In all cases there is only one correctanswer. Read each question carefully and make sure that you understand what thequestion wants?You must sign the pledge in order to be graded.TRUE or FALSE1.The highest electronegativity is at the bottom of Group IA in the periodic table. ( 2.Covalent bonds are always directional. ( 3.A single microconstituent can have one or more phases ( 4.Mechanical properties are constant within a one phase region. ( )5.The liquidus is the highest temperature where some solid can exist. ( )6.A ductile material cannot be fabricated by casting. ( )7.The degree of polymerization has little or no effect on the modulus of elasticity of acomposite. ( 8.Specific strength is the ratio of tensile strength to specific gravity. ( 9.Corrosion rate will be higher at a higher temperature. ( 10. For a required modulus of elasticity in a fiber reinforced composite, less fiber isneeded for iso-strain loading than for iso-stress loading. ( )))))))