Exam 1 - Practice Test (1).pdf

Note: This practice test is provided as a study aid – it gives you a rough idea of the length of the exam, question distribution, and difficulty level. Individual students may find the actual exam to be harder or easier than the practice test. Fill out the top of your bubble sheet as demonstrated below. It is very important to correctly have your Name, GT Username, Version, and Section filled in! If you leave one of these out, 5 percentage points will be deducted from your final score. Your exam version is version A (Exam version is NOT the same as your assigned section: B, C, or E) Sign the Honor Statement: I commit to uphold the ideals of honor and integrity by refusing to betray the trust bestowed upon me as a member of the Georgia Tech community. Name: Date Signature: Once we begin, you will have the remainder of class time to complete the exam. You may remove the front equation sheet and you may write on the exam booklet. When you are finished, please hand in your exam to the TA and show your BuzzCard to confirm exam attendance. Good luck!

0 EQUATIONS: 𝐴 ? = ? 𝜀 𝑡 𝐽 = −? 𝑑? 𝑑𝑥 ? ? 𝑅 = 𝜌 𝐴 ? = ? ? exp (− ? ) ? ? 𝑇 Λ ? 𝑡ℎ ∝ ? CONVERSIONS 𝑅 + 𝐴 + 𝑇 = 1 Δ𝐿 = 𝐿 𝑖 𝛼Δ𝑇 CONSTANTS giga - 10 9 mega - 10 6 centi - 10 -2 milli - 10 -3 micro ( μ ) - 10 -6 nano - 10 -9 pico - 10 -12 PERIODIC TABLE ε 0 = 10 -11 F/m k b = 10 -4 eV/K ?

1 Which of the following best describes the main theme of the materials science and engineering discipline? (A) MSE seeks to understand and apply the inter-relationships between how materials are processed, their structure, and their resultant properties. (B) MSE seeks to understand how to design the shape and size of material to optimize performance. (C) MSE seeks to make the strongest, most robust materials known to man. (D) MSE seeks to measure material constants as precisely as possible without trying to understand the underlying structure that affects these constants. (E) MSE does not have a central paradigm, it’s just a hodgepodge of ideas I need to memorize so I can pass this course. 2 Which of the following is a performance parameter (NOT a materials constant): (A) Heat Capacity (B) Reflectivity (C) Conductivity (D) Capacitance (E) Both C & D 3 Which of the following is an example of a thermal property of a material? (A) Ductility (B) Piezoelectricity (C) Resilience (D) Heat capacity (E) Both C & D 4 If you wanted to quantitatively assess the visible color of a dyed polymer sheet, which of the following instrument(s) might you use: (A) Tensile Tester (B) Hardness Tester (C) UV/Vis Spectrometer (D) B & C (E) None of these 5 The refractive index of a material would be classified as: (A) A chemical property (B) A mechanical property (C) An optical property (D) Both A & C (E) Both B & C

6 In your new engineering job, you are asked to evaluate two glass-polymer composite materials for a structural (weight-bearing) application. One composite uses glass shaped as sheets while the other composite uses glass shaped as fibers. Both composites are composed of 50% glass and 50% polymer. Without seeing the specification sheet, would you be willing to believe the following statement from the vendor selling you the composite: “Both materials will have nearly the same mechanical strength and toughness because they both have the same composition.” (A) Yes, this sounds believable. (B) No, this sounds suspicious. 7 Piezoelectricity would be classified as: (A) A mechanical property (B) An electrical property (C) A chemical property (D) Both A and B (E) Both A and C 8 You are out on a hike and find a cool rock. When your cool new rock is scratched with calcite, nothing happens to your rock. When your rock is scratched with quartz, quartz leaves a scratch mark on your rock. Which of the following MUST be true about your rock if it is used to scratch the following minerals: (A) Your rock will leave a scratch mark on gypsum. (B) Your rock will leave a scratch mark on apatite. (C) Your rock will leave a scratch mark on ruby. (D) A & B only. (E) A, B, and C.

9 In the plot shown above, the yield strength (  y) is notated by: (A) Point A (B) Point B (C) Point C (D) Point D 10 You are hired to design a diving board (spring board) for a swimming pool. The board material should flex but neither break nor permanently deform. To get this performance, you should select a material with… (A) …a low yield strength but high fracture toughness. (B) …a low yield strength and low fracture toughness. (C) …an extremely high elastic modulus and a high yield strength. (D) …a moderate elastic modulus and a low yield strength. (E) …a moderate elastic modulus but a high yield strength. 11 Which of these drawings BEST depicts the toughness of a material?

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