t1f08 - MAT 200 Test 1 Fall 2008 ID number: This is a...

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MAT 200 Test 1 Fall 2008 ID number: This is a closed book test. No notes, books, or information stored in calculator memories may be used. Formulae needed for the examination are provided on the last page. Cheating will be punished severely. All of your work must be written on these pages and turned in. Your writing must be legible. Be sure that you read and answer all parts of each question. Using a pencil, fill your ID number and the answers on the scan sheet after you complete the exam and return the scan sheet along with your answers to the examination questions. Only the answers on the scan sheets will be used. Therefore, be very careful to transfer your answers to the scan sheets. All questions carry equal points(2). 1. Bonding as a 'balloon of electrons' with each atom contributing a fixed number of electrons best describes: a. covalent bonding b. metallic bonding c. Van der-Waals bonding d. all of the above ( b ) 2. The number of atoms that touch an atom in the center of a body-centered cubic (bcc) structure? a. 4 b. 6 c. 8 d. 12 ( c ) 3. The shortest distance between atoms in a face-centered cubic (fcc) crystal is in the direction: a. <100> b. <110> c. <111> d. <210> ( b ) 4. A small impurity atom is a defect called a. intersititial point defect b. an edge or screw dislocation c. a vacancy d. none of the above ( a ) 5. The ABCABCABC stacking sequence is present in a. face-centered cubic b. hexagonal close packed c. simple cubic d. all of the above contain close packed planes ( a ) 6. The number of vacancies in a material: a. increases linearly with increasing temperature (T) b. increases exponentially with increasing temperature ,exp(-Gv/kT) c. decreases with increasing temperature , (1/T) d. decreases exponentially with increasing temperature, exp(Gv/kT) ( b ) 7. The brittle behavior of ionic solids arises from the a. weak van der Wall’s bonding between ions 1
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b. centralized forces acting between ions c. directional or angular dependent forces between ions d. rigid neighborhood between ions ( d ) 8. A grain boundary is an example of a a. point defect b. line defect c. surface defect d. none of the above ( c ) 9. Two types of dislocations are: a. interstitial and subsitutional b. FCC and BCC c. Edge and screw d. None of the above ( c ) 10. Slip occurs by
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t1f08 - MAT 200 Test 1 Fall 2008 ID number: This is a...

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