Single/Multiple choices (5pts) 1. What are the variables that define the elastic modulus of a material? (a) maximum load, (b) size of the material, (c) the deformation of material under certain loads, (d) the deformation of material under maximum load, (e) the total deformation of a material before failure. 2. What are the variables that define the ultimate strength of a material? (a) maximum load level, (b) size of the material, (c) the total deformation of a material before failure, (d) weight of material. 3. What are some of the possible reasons of tailoring/introducing defects into material lattice structures: (a) to enhance mechanical strength of material; (b) to decrease mechanical strength of material; (c) to alter the electrical conductivity; (d) to improve corrosion resistance of material; (e) to change the shape of material; (f) to alter the melting point of the material. 4. Which of these materials tend to fail catastrophically? (a) alumina, (b) carbon steel, (c) polypropylene, (d) gold, (e) concrete, (f) diamond. 5. Compressive mechanical testing is commonly employed for obtaining which of the following material properties: (a) elastic modulus; (b) yield strength; (c) ultimate strength; (d) crack propagation of concrete; (e) energy absorption of foam crushing; ( f ) flexural strength. 6. What promote(s) the viscoelastic behavior of materials: (a) reduced temperature; (b) elevated temperature; (c) Increased material density; (d) deformation speed; (e) increased stress level