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

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
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 A. 12 B. 6 C. 14 D. 8 E. 17 4. One cubic meter of gold which is 99.999% pure will have A. More than 1 x 10 16 impurity atoms B. Less than a billion impurity atoms C. Less than a thousand impurity atoms D. No lattice defects at all E. None of the above 5. Which is perpendicular to [-102] in an fcc crystal? A. [102] B. [102] C. [20-1] D. [120] E. none of the above 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 A. Have little effect on strength B. Are line type defects C. Usually tend to strengthen metals D. Aid the motion of dislocations E. (B and D) from above 8. The bcc crystal structure A. Has 4 atoms per unit cell B. Is close-packed on (110) C. Is close-packed in [111] D. Has a coordination number of 12 E. All of the above
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
9. Decreasing the average grain size of a metal A. Causes a drop in toughness B. Increases the grain boundary area C. Decreases yield strength D. Causes brittleness E. All of the above 10. At the equilibrium spacing between two atoms in a solid A. The potential energy of the atoms is at a minimum B. The net force between the atoms is zero C. Attractive and repulsive forces are balanced D. Pushing them closer increases the potential energy E. All of the above 11. Metallic bonding usually results in: A. Chemical bonds which are directional . B. Good thermal conductivity.
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 03/26/2008 for the course MSE 250 taught by Professor Grummon during the Spring '08 term at Michigan State University.

Page1 / 6

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

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online