2009 final - Page 1 Materials 1M03, Final Exam 2009 Version...

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Page 1 Materials 1M03, Final Exam 2009 April 28, 2009 Version (1) Last Name: _________________ First Name: _____________ Student ID#: _________________ MATERIALS 1M03 FINAL EXAM, 2009 This test contains 23 questions (20 MC and 3 long answer) and 10 pages. You are responsible for ensuring that your copy of the paper is complete. Bring any discrepancy to the attention of your invigilator. SPECIAL INSTRUCTIONS: Aids allowed: 1 double-sided aid sheet, nominally 8½ by 11 in. McMaster standard Casio FX-991 calculator Answer all multiple choice questions on the special answer sheet only. Answer all written questions on the examination copy. Be sure to show your work (where applicable) so that part marks can be awarded for incomplete answers. Be sure to include units with all answers that require them. Useful constants: Gas constant, R = 8.31 J/mol-K Charge per electron, e = 1.6 x 10 -19 C Avogadro’s number, N A = 6.02 x 10 23 Boltzmann’s constant, k = 1.38 x 10 -23 J/atom-K = 8.62 x 10 -5 eV/atom-K 1cal =4.184J MC Q20 Q21 Q22 Total
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Page 2 Materials 1M03, Final Exam 2009 April 28, 2009 Version (1) Part A: This part consists of twenty multiple choice questions, worth 2 marks each. In each case, put your answers on the scan sheet (marked McMaster University Examination Answer Sheet). Read the Marking Directions on this sheet carefully before starting. 1. A 2 mm thick glass sheet is being used for a window. The thermal conductivity of glass is 1.7 J/(m.K.s). The temperature outside is -20 o C and that inside is 20 o C. Assuming steady-state is reached, how far into the glass sheet, from the high temperature side, will the temperature be +15 o C. (a) 0.25 mm (b) 0.50 mm (c) 0.75 mm (d) 1.00 mm 2. The activation energy for vacancy formation in a hypothetical material is 50 kJ/mole. By how much will the vacancy concentration increase if the temperature is raised from 100 o C to 200 o C? (a) Concentration will increase by a factor of 2. (b) Concentration will increase by a factor of 10. (c) Concentration will increase by a factor of 30. (d) Concentration will increase by a factor of 100. 3. In a brittle material, which of the following best describes the physical conditions that determine if a crack will propagate: (a) A crack will propagate if the strain energy released is smaller than the grain boundary energy created during crack propagation. (b) A crack will propagate if the strain energy released is smaller than the free surface energy created by the crack opening.
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This note was uploaded on 04/04/2011 for the course MATLS 1M03 taught by Professor Okon during the Spring '09 term at McMaster University.

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2009 final - Page 1 Materials 1M03, Final Exam 2009 Version...

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