Quiz 30-Version X 7. In general, which materials are the least dense? 1. The she
ID: 635410 • Letter: Q
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Quiz 30-Version X 7. In general, which materials are the least dense? 1. The shear modulus G is a measure of which property? A. Yield strength B. Toughness C. Ductility D. Stiffness A. Metals B. Ceramics C. Polymers D. Composites 8. In general, which category of materials is most resistant to cocidation? A. Metals B. Ceramics C. Polymers 2. The critical stress intensity K…measure of s which property? A. Yleld strength Toughness C. Ductility D. Stiffness D. Composites 9. Which materials are light, stiff, strong, tough, fatigue and corrosion-resistant, but also expen sive, difficult to form, and subject to creep? A. Metals B. Ceramics C. Polymers D. Composites 3. The strain after fracture er is a measure of which property? A. Yield strength B. Toughness D. Stiffness 10. Which process occurs when a brittle material is crushed? A. Reversible stretching of atomic bonds B. Unstable crack propagation C. Stable crack propagation D. Intergranular attack E. Dislocation glide F. Diffusiosn 4. The hardness H is related to which property of a metal? A. Yield strength B. Toughness C. Ductility D. Stiffnes S. Which property determines the formability of a 11. Which process occurs during fast fracture? material? A. Yield streagth B. Toughness A. Reversible stretching of atomic bonds B. Unstable crack propagation C. Stable crack propagation D. Intergranular attack E. Dislocation glide F. Diffusion D. Stiffness 6. In general, which category of materials is the most ductile? A. Metals B. Ceramics C. Polymers D. Composites 12. Which process occurs during plastic deforma- tion? A. Reversible stretching of atomic bonds B. Unstable crack propagation C. Stable crack propagation D. Intergranmular attack E. Dislocation glide F. DiffusionExplanation / Answer
1. Shear Modulus is measure of shear stresses which produces shear strain in the body. It is a measure of stiffness of a body or material hence answer is "D".
6. Ductility is the ability/capacity of a material to deform under stresses. More the ductile is the material more is its ability to stretched in wires."D" is the answer as composites, are the combinations of materials metals and non metals (ceramics and polymers) with improved properties. Comparitively ceramics are brittle and hence very less ductile after that metals which are stiff, strong and ductile and then polymers , more ductile comarartive to metals and ceramics.
7. The answe is "C" polymers have low densities because of their large molecular structure which gives a large volume & hence smaller densities.
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