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Crystal Field Theory
Quiz 2
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Q.1
The basic structural unit or building block of the crystal structure and defines the crystal structure by virtue of its geometry and the atom positions within
Lattice
Amorphous
Unit Cells
FCC
Q.2
Cube edge length a or x and the atomic radius R in FCC is related by
a = 2R√𝟐
a = 4R3\frac{4R}{\sqrt{3}}34R
Q.3
In order to compute the number of atoms per unit cell for the HCP crystal structure we will use
N=Ni +Nf2+Nc6N=Ni\ +\frac{Nf}{2}+\frac{Nc}{6}N=Ni +2Nf+6Nc
N=Ni +Nf2+Nc8N=Ni\ +\frac{Nf}{2}+\frac{Nc}{8}N=Ni +2Nf+8Nc
Q.4
The sum of the sphere volumes of all atoms within a unit cell (assuming the atomic hard-sphere model) divided by the unit cell volume
Atomic packing factor (APF)
Total unit cell volume
Volume of atoms in a unit cell
Q.5
When metals and nonmetals have more than one crystal structure
Polymorphism
Allotropy
Q.6
Allotropy is
when more than one crystal structure is found in elemental solids
when metals and nonmetals have more than one crystal structure
Q.7
There are nine different possible combinations of which represents a distinct crystal system.
True
False
Q.8
Crystallography
science of measuring the crystal structure of a crystal
science of combining crystals with another crystals
science of determining the color of a crystal
science of measuring the reactants of a crystal
Q.9
Defined as a line directed between two points, or a vector
crystallographic direction
crystallographic position
crystallographic color
crystallographic size
Q.10
Defined as the number of atoms per unit length whose centers lie on the direction vector for a specific crystallographic direction
Linear Density (LD)
Atomic Density (AD)
Unit Cell Density (UCD)
Planar Density (PD)
Q.11
Taken as the number of atoms per unit area that are centered on a particular crystallographic plane
Linear Density (LD)
Atomic Density (AD)
Unit Cell Density (UCD)
Planar Density (PD)
Q.12
The result when the periodic and repeated arrangement of atoms is perfect or extends throughout the entirety of the specimen without interruption
single crystal
polycrystalline
Q.13
Spheres representing nearest-neighbor atoms touch one another.
Atomic hard-sphere model
Bohr Model
Reduced sphere model
Lattice
Q.14
Means a three-dimensional array of points coinciding with atom positions
Lattice
Amorphous
Unit Cells
FCC
Q.15
Long-range atomic order is absent
Crystalline material
Amorphous Material
Q.16
Long-range order exists
Crystalline material
Amorphous Material
Q.17
Grain boundary is a
point defect
surface defect
line defect
none
Q.18
The number of switches (transistors) that can fit on a single computer chip has doubled
Every 2 years
Every 5 years
Every year
Every few months
Q.19
Which of the given cubic structure has the highest packing factor
FCC
BCC
SC
none
Q.20
Coordination number ofis the characteristic of
BCC
FCC
SC
none
0 h : 0 m : 1 s
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