Sample Midterm - Mark your choice for each of the questions...

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Mark your choice for each of the questions on the answer form provided by completely blackening the circle corresponding to the letter for your answer. Each question is worth 4 points. No penalty will be made for incorrect answers, so answer all the questions even if you have to guess. There is one BEST response for each question, but note the ‘none of the above’ cases, etc. 1. Valence electrons A. Are tightly bound to the nucleus in metals B. Form directional bonds in metallic solids C. Are positively charged D. Cannot participate in chemical bonding E. None of the above 2. Real crystalline solids, at room temperature A. Have no short range order B. Have many naturally occurring defects C. Have no long range order D. Contain no vacant lattice sites at room temperature E. None of the above 3. The coordination number for hcp crystals is 4. One cubic meter of gold which is 99.999% pure will have 5. Which is perpendicular to [-102] in an fcc crystal? 6. The ultimate tensile strength (in a test taken to failure) A. Is the strength of the material when correctly processed B. Is the highest load in a tensile test divided by the final cross-sectional area C. Is the maximum true stress attained in a tensile test D. Is the highest engineering stress attained in a tensile test E. (B and D) from above 7. Grain boundaries 8. The bcc crystal structure
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