Which is true regarding the crystal systems?
A) they completely define a crystal structure
B) they describe the shape of the unit cell.
C) 7 shapes can completely fill 3D space through translational symmetry
D) all of the above. - ANSWER C) 7 shapes can completely fill 3D space
through translational symmetry
Which of the following is NOT one of the 7 crystal systems?
A) Tetragonal
B) Rhombohedral
C) Trigonal
D) Face centred cubic - ANSWER D) Face centred cubic
Elemental metals do not commonly crystallize in which of the following
lattices
A) simple cubic
B) face-centred cubic
C) hexagonal close packed
D) body centered cubic - ANSWER A) simple cubic
Which direction has the highest linear density in a crystal of Cu that
crystallizes in the fcc?
A) [100]
B) [110]
C) [111]
D) (110) - ANSWER B) [110]
Which direction has the highest linear density in a crystal of Na that
crystallizes in the bcc?
A) [110]
B) [100]
C) [111]
, D) (111) - ANSWER C) [111]
In a BCC metal, the plane with the highest planer density is:
A) (100)
B) (110)
C) (111)
D) (200) - ANSWER B) (110)
The closest packed plane in a metal FCC structure is:
A) (100)
B) (110)
C) (111)
D) (200) - ANSWER C) (111)
Which is TRUE about Bragg's Law?
A) It defines conditions necessary for diffraction in primitive cells
B) It is insufficient to predict diffraction in non-primitive cells
C) It relates the the path length difference between to diffracted beams
to the lattice d-spacing
D) All of the above - ANSWER D) All of the above
Which plane will show a peak on a diffraction pattern for alpha-Fe (metal
bcc structure)?
A) (100)
B) (220)
C) (210)
D) (221) - ANSWER B) (220)
Which of the following statements about vacancies is true?
A) vacancies are always present in materials
B) as temperature increases, the number of vacancies will increase
C) as temperature decreases, the number of vacancies will increase
D) vacancies are considered linear defects - ANSWER B) as
temperature increases, the number of vacancies will increase
The Hume-Rothery rules give the conditions to be met for
A) Mixing between two elements
B) Assignment of coordination number
A) they completely define a crystal structure
B) they describe the shape of the unit cell.
C) 7 shapes can completely fill 3D space through translational symmetry
D) all of the above. - ANSWER C) 7 shapes can completely fill 3D space
through translational symmetry
Which of the following is NOT one of the 7 crystal systems?
A) Tetragonal
B) Rhombohedral
C) Trigonal
D) Face centred cubic - ANSWER D) Face centred cubic
Elemental metals do not commonly crystallize in which of the following
lattices
A) simple cubic
B) face-centred cubic
C) hexagonal close packed
D) body centered cubic - ANSWER A) simple cubic
Which direction has the highest linear density in a crystal of Cu that
crystallizes in the fcc?
A) [100]
B) [110]
C) [111]
D) (110) - ANSWER B) [110]
Which direction has the highest linear density in a crystal of Na that
crystallizes in the bcc?
A) [110]
B) [100]
C) [111]
, D) (111) - ANSWER C) [111]
In a BCC metal, the plane with the highest planer density is:
A) (100)
B) (110)
C) (111)
D) (200) - ANSWER B) (110)
The closest packed plane in a metal FCC structure is:
A) (100)
B) (110)
C) (111)
D) (200) - ANSWER C) (111)
Which is TRUE about Bragg's Law?
A) It defines conditions necessary for diffraction in primitive cells
B) It is insufficient to predict diffraction in non-primitive cells
C) It relates the the path length difference between to diffracted beams
to the lattice d-spacing
D) All of the above - ANSWER D) All of the above
Which plane will show a peak on a diffraction pattern for alpha-Fe (metal
bcc structure)?
A) (100)
B) (220)
C) (210)
D) (221) - ANSWER B) (220)
Which of the following statements about vacancies is true?
A) vacancies are always present in materials
B) as temperature increases, the number of vacancies will increase
C) as temperature decreases, the number of vacancies will increase
D) vacancies are considered linear defects - ANSWER B) as
temperature increases, the number of vacancies will increase
The Hume-Rothery rules give the conditions to be met for
A) Mixing between two elements
B) Assignment of coordination number
