Q.1
In order to compute the number of atoms per unit cell for the HCP crystal structure we will use
  • $N=Ni\ +\frac{Nf}{2}+\frac{Nc}{6}$
  • $N=Ni\ +\frac{Nf}{2}+\frac{Nc}{8}$
Q.2
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.3
When metals and nonmetals have more than one crystal structure
  • Polymorphism
  • Allotropy
Q.4
Allotropy is
  • when more than one crystal structure is found in elemental solids
  • when metals and nonmetals have more than one crystal structure
Q.5
There are nine different possible combinations of which represents a distinct crystal system.
  • True
  • False
Q.6
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.7
Defined as a line directed between two points, or a vector
  • crystallographic direction
  • crystallographic position
  • crystallographic color
  • crystallographic size
Q.8
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.9
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.10
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.11
Spheres representing nearest-neighbor atoms touch one another.
  • Atomic hard-sphere model
  • Bohr Model
  • Reduced sphere model
  • Lattice
Q.12
Means a three-dimensional array of points coinciding with atom positions
  • Lattice
  • Amorphous
  • Unit Cells
  • FCC
Q.13
Long-range atomic order is absent
  • Crystalline material
  • Amorphous Material
Q.14
Long-range order exists
  • Crystalline material
  • Amorphous Material
Q.15
Grain boundary is a
  • point defect
  • surface defect
  • line defect
  • none
Q.16
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.17
Which of the given cubic structure has the highest packing factor
  • FCC
  • BCC
  • SC
  • none
Q.18
Coordination number ofis the characteristic of
  • BCC
  • FCC
  • SC
  • none
Q.19
What is a grain boundary?
  • Site where 5 crystals meet
  • Site where 9 crystals meet
  • Site where 2 crystals meet
  • Site where 15 crystals meet
Q.20
What is the percentage of emptiness in the Body Center Cubic form?
  • 70%
  • 50%
  • 32%
  • 63%
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