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MATSE 201 Exam 1 Theoretical Questions And Answers
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MATSE 201 Exam 1 Theoretical Questions And Answers
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Solution 2024/2025Pepper
MATSE 201 Exam 1 Theoretical Questions And
Answers
What is true regarding the crystal systems? ANS✔✔ there are 7 shapes that can completely fill 3D space through
translational symmetry
Which of the following is not one of the crystal systems? ANS✔✔ Face centered cubic
examples of crystal systems: tetragonal, rhombohedral, trigonal
Elemental metals do not commonly crystallize in which of the following lattices ANS✔✔ Simple cubic
Which direction has the highest linear density in a crystal of Cu that crystallizes in the FCC? ANS✔✔ [110]
Which direction has the highest linear density in a crystal of Na that crystallizes in BCC? ANS✔✔ [111]
In a BCC metal, the plane with the highest planar density is: ANS✔✔ (110)
The closest packed plane in a metal FCC structure is: ANS✔✔ (111)
Which is true about Bragg's Law? ANS✔✔ All statements listed are true...
1. It defines conditions necessary for diffraction in primitive cells
2. It is insufficient to predict diffraction in non-primitive cells
3. It relates the path length difference between to diffracted beams to the lattice d-spacing
Which plane will show a peak on a diffraction pattern for alpha -Fe (metal bcc structure)? ANS✔✔ (220)
, Solution 2024/2025
Pepper
Which of the following statements about vacancies is true? ANS✔✔ as temperature increases, the number of vacancies
will increase
The Hume-Rothery rules give the conditions to be met for ANS✔✔ Complete solid solubility
Which of the following describes the defect represented by Al-mg? ANS✔✔ Aluminum substitution on a magnesium site
Which of the following could be used to maintain electroneutrality for the substitution of an aluminum atom into a a
magnesium lattice point? ANS✔✔ For every two aluminum substitutions, create a copper vacancy
Which is true regarding dislocations in crystals? ANS✔✔ they can be described quantitatively by their Burger's vector
Twin boundaries, grain boundaries, and stacking faults all represent which kind of defect. ANS✔✔ Two dimensional
defects
Which of the following statements describes Fick's first law? ANS✔✔ the diffusivity is proportional to the concentration
gradient
Diffusion in a solid... ANS✔✔ All statements are correct...
1. is facilitated by point defects such as vacancies
2. is a function of temperature
3. requires a concentration gradient
A condition of non-steady state diffusion (i.e. the net flux varying with time) can be described by.. ANS✔✔ Fick's Second
Law
Diffusivity has units of ANS✔✔ length^2/time
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