MSE201 Midterm Exam 10/17/2014 Each element 2 points. Put ALL calculations and answers in your Blue Book! 1. Materials are characterized by: a. Macroscopic properties b. Microstructure c. Atomic level composition d. All of the above 2. Atoms are: a. Discrete units of matter b. An abstract concept c. Found in fractional units d. Crystallographic lattice points 3. The Burger’s vector describes: a. Surface cracks b. Crystal twinning c. Dislocation geometry d. The most direct route to McDonald’s 4. Cubic Close Packed (CCP) is another name for which of the following: a. HCP b. BCC c. FCC d. All of the above 5. Glass and ceramic materials tend to: a. Fail catastrophically at low strain b. Show ductility c. Deform plastically before failure d. Have elastic moduli ~106 Pa 6. Solid state diffusion & vacancy generation: a. Are completely unrelated b. Are directly related c. Increase linearly with Temperature d. Describe lattice point motion 7. Diffusion & heat transfer: a. Are completely unrelated b. Are directly related c. Increase linearly with Temperature d. Have identical differential equations 8. A vacancy and a dislocation both: a. Disrupt the crystal lattice b. Represent partial occupancy c. Contain ruptured bonds d. Are low energy regions 9. Dislocations: a. Are interstitial dopants b. Are crystal defects c. Require atomic impurities d. Enhance plastic deformation 10. Ionic, covalent and metallic bonding are primary bonding types. a. Primary bonds require exchange or sharing of what between atoms? b. How does electronegativity drive the reaction of sodium metal and chlorine gas to form sodium chloride? c. Carbon-carbon bonds are what type? d. The directional nature of covalent bonds is related to what structural feature of atoms? 11. The (111) plane of the FCC structure is close-packed. a. Sketch this plane within a unit cell. b. How many atoms are on the plane you drew inside the unit cell? c. Estimate the area of the plane d. Calculate the area atomic density e. If there is one vacancy per 1012 lattice points at 273K, what is the partial atomic occupancy of each lattice point? f. If you are asked calculate the number of vacancies present at 600K, what additional information do you need? 12. Dislocation motion occurs largely along close-packed directions and planes. First, compare the FCC & BCC structures: a. Describe any close packed planes b. Describe any close packed directions c. If the ductile-to-brittle transition at low temperatures is related to the number of close-packed directions and planes, do you expect BCC or FCC metals to have greater ductility? d. Magnesium and other HCP metals are brittle. Does your analysis from 12.c. support this observation? 13. A tensile test is performed on a ductile sample. The first 1% of strain is elastic with a modulus of 100E9 Pa, at which point plastic deformation begins. The tensile strength of 1.1E9 Pa is determined at 9% strain, while failure occurs at a stress of 9E8 Pa and strain of 18%. a. Sketch the complete stress-strain cycle b. Estimate the toughness in units of J/m3.

MSE201 Midterm Exam 10/17/2014 Each element 2 points. Put ALL calculations and answers in your Blue Book! 1. Materials are characterized by: a. Macroscopic properties b. Microstructure c. Atomic level composition d. All of the above 2. Atoms are: a. Discrete units of matter b. An abstract concept c. Found in fractional units d. Crystallographic lattice points 3. The Burger’s vector describes: a. Surface cracks b. Crystal twinning c. Dislocation geometry d. The most direct route to McDonald’s 4. Cubic Close Packed (CCP) is another name for which of the following: a. HCP b. BCC c. FCC d. All of the above 5. Glass and ceramic materials tend to: a. Fail catastrophically at low strain b. Show ductility c. Deform plastically before failure d. Have elastic moduli ~106 Pa 6. Solid state diffusion & vacancy generation: a. Are completely unrelated b. Are directly related c. Increase linearly with Temperature d. Describe lattice point motion 7. Diffusion & heat transfer: a. Are completely unrelated b. Are directly related c. Increase linearly with Temperature d. Have identical differential equations 8. A vacancy and a dislocation both: a. Disrupt the crystal lattice b. Represent partial occupancy c. Contain ruptured bonds d. Are low energy regions 9. Dislocations: a. Are interstitial dopants b. Are crystal defects c. Require atomic impurities d. Enhance plastic deformation 10. Ionic, covalent and metallic bonding are primary bonding types. a. Primary bonds require exchange or sharing of what between atoms? b. How does electronegativity drive the reaction of sodium metal and chlorine gas to form sodium chloride? c. Carbon-carbon bonds are what type? d. The directional nature of covalent bonds is related to what structural feature of atoms? 11. The (111) plane of the FCC structure is close-packed. a. Sketch this plane within a unit cell. b. How many atoms are on the plane you drew inside the unit cell? c. Estimate the area of the plane d. Calculate the area atomic density e. If there is one vacancy per 1012 lattice points at 273K, what is the partial atomic occupancy of each lattice point? f. If you are asked calculate the number of vacancies present at 600K, what additional information do you need? 12. Dislocation motion occurs largely along close-packed directions and planes. First, compare the FCC & BCC structures: a. Describe any close packed planes b. Describe any close packed directions c. If the ductile-to-brittle transition at low temperatures is related to the number of close-packed directions and planes, do you expect BCC or FCC metals to have greater ductility? d. Magnesium and other HCP metals are brittle. Does your analysis from 12.c. support this observation? 13. A tensile test is performed on a ductile sample. The first 1% of strain is elastic with a modulus of 100E9 Pa, at which point plastic deformation begins. The tensile strength of 1.1E9 Pa is determined at 9% strain, while failure occurs at a stress of 9E8 Pa and strain of 18%. a. Sketch the complete stress-strain cycle b. Estimate the toughness in units of J/m3.

info@checkyourstudy.com MSE201 Midterm Exam 10/17/2014 Each element 2 points. Put … Read More...
Adrenaline is a “fight-or-flight” hormone and is released when danger threatens or in an emergency. It binds to a protein receptor, which causes a number of reactions to occur inside the cell. Enzymes are produced that perform a number of functions, including release of sugar into the bloodstream. What function does adrenaline play in this pathway

Adrenaline is a “fight-or-flight” hormone and is released when danger threatens or in an emergency. It binds to a protein receptor, which causes a number of reactions to occur inside the cell. Enzymes are produced that perform a number of functions, including release of sugar into the bloodstream. What function does adrenaline play in this pathway

signal molecule
Unlike the Citric Acid cycle and electron transport, glycolysis occurs _____.in the cytoplasm directly on the surface of the mitochondrial membrane within the mitochondrial membrane within the cell nucleus

Unlike the Citric Acid cycle and electron transport, glycolysis occurs _____.in the cytoplasm directly on the surface of the mitochondrial membrane within the mitochondrial membrane within the cell nucleus

in the cytoplasm
Since the first cloned animal was produced using a fully differentiated cell, a number of observations have been made. Which of the following statements is true in regard to reproductive cloning?

Since the first cloned animal was produced using a fully differentiated cell, a number of observations have been made. Which of the following statements is true in regard to reproductive cloning?

Only a small fraction of cloned embryos develop normally
Gene therapy may be used in the future to fight cancer by inserting genes that Select one: fight off mutations of the patient’s DNA. produce radioactive isotopes. cause cell death. produce anticancer drugs. all of the above.

Gene therapy may be used in the future to fight cancer by inserting genes that Select one: fight off mutations of the patient’s DNA. produce radioactive isotopes. cause cell death. produce anticancer drugs. all of the above.

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While transplanting flowers you accidentally damaged the roots. What is the most likely scenario that will occur as a result of damage to the roots? Select one: The slimy sheath on the root cap has been wiped off and the parenchyma cells were damaged resulting in damage to the zone of cell division. The slimy sheath on the root cap has been wiped off and the parenchyma cells were damaged resulting in damage to the zone of elongation. The slimy sheath on the root cap has been wiped off and the parenchyma cells were damaged resulting in damage to the zone of maturation. The slimy sheath on the root cap has been wiped off and the epidermal cells were damaged resulting in damage to the zone of cell division. The slimy sheath on the root cap has been wiped off and the epidermal cells were damaged resulting in damage to the zone of maturation.

While transplanting flowers you accidentally damaged the roots. What is the most likely scenario that will occur as a result of damage to the roots? Select one: The slimy sheath on the root cap has been wiped off and the parenchyma cells were damaged resulting in damage to the zone of cell division. The slimy sheath on the root cap has been wiped off and the parenchyma cells were damaged resulting in damage to the zone of elongation. The slimy sheath on the root cap has been wiped off and the parenchyma cells were damaged resulting in damage to the zone of maturation. The slimy sheath on the root cap has been wiped off and the epidermal cells were damaged resulting in damage to the zone of cell division. The slimy sheath on the root cap has been wiped off and the epidermal cells were damaged resulting in damage to the zone of maturation.

While transplanting flowers you accidentally damaged the roots.  What is … Read More...