HWK 0

Which of the following properties is an example of a THERMAL property: A. Emissivity B. Heat Capacity C. Refractice index D. Hardness

B) Heat Capacity

Machining a plastic plate to make it thinner would potentially... A. ...change both its performance parameters and materials properties for some applications. B. ...change its performance parameter(s) for some applications but not alter its material properties. C. ...change its materials propert(ies) for some applications but not alter its performance parameters. D. ...have no impact on either its performance parameters or materials properties for any applications.

B. ...change its performance parameter(s) for some applications but not alter its material properties.

Which of the following is/are example(s) of optical properties of materials? A. Refractive Index B. Dielectric Constant C. Reflectivity - Both A,B - Both B,C - Both A,C - A,B,C are ALL optical properties - None

Both A,C

In the history of humankind, why did humans work with bronze (the Bronze Age) prior to working with iron (the Iron Age)? A. Because copper and zinc (the elements that make-up bronze) are more abundant than iron. B. Because bronze is more valuable than iron. C. Bronze's lower melting temperature makes it easier to process than iron. D. Because bronze was considered "more beautiful" than iron.

C. Bronze's lower melting temperature makes it easier to process than iron.

Polishing the surface of a material so that it becomes really reflective (i.e., a "mirror-like" finish) is an example of... A. ...modifying the material constant of a material in such a way as to have no influence on its performance in a given application. B. ...modifying both the shape and material constant of a material. C. ...modifying the material constant of a material that may change its performance for a given application. D. ...modifying the shape of a material in a way that may change its performance for a given application. E. ...modifying the shape of a material in such a way as to have no influence on its performance in a given application.

D. ...modifying the shape of a material in a way that may change its performance for a given application.

The dissolution of a polymer into a solvent (solubility) is considered what type of material property? A. Mechanical B. Optical C. Thermal D. Chemical E. Magnetic

D. Chemical

Which of the following best describes the main theme of the materials science and engineering discipline? A. MSE seeks to make the strongest, most robust materials known to man B. MSE seeks to understand the relationships between materials constants and performance parameters C. MSE seeks to understand how to design the shape and size of materials to optimize performance D. MSE seeks to understand an apply the inter-relationships between how materials are processed, their structure, and their resultant properties E. MSE does not have a central paradigm

D. MSE seeks to understand and apply the inter-relationships between how materials are processed, their structure, and their resultant properties.

The Kerr effect is a phenomenon in which the refractive index of a material changes with the application of an electric field. Thus, the Kerr constant is an example of a material constant that crosses which two classes of properties? A. Optical and Magnetic B. Thermal and Optical C. Electrical and Thermal D. Optical and Electrical E. Magnetic and Electrical

D. Optical and Electrical

(T/F) Most of the materials we use in engineering application today were developed before the year 1900

F

You are told that a new batch of steel beams have arrived but come from a new vendor. You don't know anything about the specific alloy types, but your colleague says he checked the compositions and the new steel beams are identical in composition to the old steel beams. Based on the identical composition, he concludes that these new beams should have the same mechanical properties and that construction should continue. What would be your response?

You would disagree and say that work should stop until you can confirm exact specifications because a material's properties can depend upon other structural features besides composition.