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}}3​4R​
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