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WorksheetsA231 SFB2012
Total questions: 80
Worksheet time: 43mins
You need to build a prototype of a design and need to choose a material that is strong and able to withstand the outdoor elements. You are not concerned about cost. Which type of material should you choose?
Plastic
Wood
Metal
Although ceramic materials have a good range of important properties one limitation to their use is that they are often
Too malleable
Too brittle
Too ductile
Too light
Which of the following is a ceramic material?
LCS
ABS
Carbon fibre
Silicon nitrite
Most ceramic materials have good insulation properties.
False
True
Which of the following factors does not influence the variety and quality of metal?
Rate of heating and cooling
Quenching medium
Grain size
Furnace
What kind of bond is sodium/table salt?
Bionic
Covalent
Metallic
Ionic
What is special about an ionic bond?
Loans electrons: metal (+) 2 nonmetal (-)
Charge stays the same
Both are non-metals
Loses electrons
When an electron is shared between non-metals, it is a (a) bond.
What is an example of a metallic bond?
water
plastic
iron
ceramic
STAINLESS STEEL IS WHAT TYPE OF METAL?
FERROUS METAL
NON-FERROUS METAL
ZINC IS WHAT TYPE OF MATERIAL?
METAL
CERAMICS
POLYMERS
COMPOSITES
CARBON FIBER IS WHAT TYPE OF MATERIAL?
METAL
CERAMICS
POLYMERS
COMPOSITES
NON-FERROUS METALS ARE MAGNETIC.
TRUE
FALSE
CLAY IS WHAT TYPE OF MATERIAL?
METAL
CERAMICS
POLYMERS
COMPOSITES
RUBBER IS WHAT TYPE OF MATERIAL?
METAL
CERAMICS
POLYMERS
COMPOSITES
RESIN IS WHAT TYPE OF MATERIAL?
METAL
CERAMICS
POLYMERS
COMPOSITES
GLASS CERAMICS CANNOT BE MELTED.
TRUE
FALSE
Crystalline ceramics are
formed in various ways from powders and then fired.
TRUE
FALSE
Polyethylene is what type of polymer?
THERMOPLASTIC POLYMERS
THERMOSETTING POLYMERS
ELASTOMERS
Wood Fiber is what type of material?
METAL
CERAMICS
POLYMERS
COMPOSITES
long-range order exists
Crystalline material
Amorphous Material
long-range atomic order is absent
Crystalline material
Amorphous Material
Spheres representing nearest-neighbor atoms touch one another.
Atomic hard-sphere model
Bohr Model
Reduced sphere model
Lattice
means a three-dimensional array of points coinciding with atom positions
Lattice
Amorphous
Unit Cells
FCC
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
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
when metals and nonmetals have more than one crystal structure
Polymorphism
Allotropy
There are nine different possible combinations of which represents a distinct crystal system.
True
False
defined as a line directed between two points, or a vector
crystallographic direction
crystallographic position
crystallographic color
crystallographic size
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)
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)
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
grain boundary is
an area where some atomic mismatch within the region
where two grains meet
when the periodic and repeated arrangement of atoms is perfect or extends throughout the entirety of the specimen without interruption
number of atoms centered on a plane
crystals having hexagonal symmetry
The correct order of the packing efficiency in different types of unit cells is _______?
fcc < bcc < simple cubic
fcc > bcc > simple cubic
fcc < bcc > simple cubic
bcc < fcc > simple cubic
Which of the following statements about lattices and unit cells is correct?
A unit cell contains a whole number of complete molecules
Lattice points are chosen to lie on atoms.
Lattice points all have identical surroundings
Unit cells are constructed by connecting adjacent lattice points to give the largest possible repeat unit.
Consider the Bragg equation. If the value of the wavelength is doubled, which of the following is NOT true?
Bragg angles of reflections increase.
The d spacings become smaller.
The diffraction pattern expands.
Some previously accessible reflections can no longer be measured.
Repeatable entity of a crystal structure is known as
Crystal
Lattice
Unit cell
Miller indices
Coordination number for closest packed crystal structure
16
12
8
4
Atomic packing factor is
Distance between two adjacent atoms
Projected area fraction of atoms on a plane
Volume fraction of atoms in cell
None
Coordination number in simple cubic crystal structure
8
6
12
10
A family of directions is represented by
(hkl)
<hkl >
{hkl}
[hkl]
-----------is defined as the no. Of nearest atoms which are directly surrounding given atom
lattice
Bravias
Atomic packing factor
Co-ordination no.
The number of Bravais lattices is:
256
7
14
37
A cubic crystal system is represented by:
a = b = c , α = β = γ ≠ 90°
a = b ≠ c , α = β = γ = 90°
a = b = c , α = β = γ = 90°
a ≠ b ≠ c , α = β = γ = 90°
Co-ordination no. & Atomic Packing Fraction of HCP structure is same as that of the -----------
SC
BCC
FCC
BCT
The atomic diameter of an BCC crystal (if a is lattice parameter) is
a
a/2
a/(4/√3)
a/(4/√2)
The angle between [111] and [11⎯2] directions in a cubic crystal is (in degrees)
0
45
90
180
Which unit cell has eight particles located in the corners, has sides that are all the same length, and has angles of only 90?
body-centered cubic unit cell
triclinic unit cell
face-centered cubic unit cell
simple cubic unit cell
A particular metal has a simple cubic unit cell. How many atoms of the metal are in each unit cell?
1
2
6
2
Number lattice points in an unit cell is
one
two
four
depends on type of Bravais lattice
Intercepts of a plane in crystal is given by 1, 1/2, 1/3 in a simple cubic unit cell, Miller indices are
(1 3 2)
(2 6 1)
(1 2 3)
(3 6 1)
What is Packing Fraction of SC Lattice.
.68
.52
.74
None of these
How many number of atoms are there in FCC
1
4
2
None of the above
Number of atoms per unit cell is highest in
FCC
BCC
SC
none of the above
Effective number of atoms in HCP.
2
4
6
8
Give number of atom/s in FCC.
2
4
6
8
Number of atom/s in simple cubic (SC) is ------------.
0
1
2
4
Basis + Crystal lattice is known as
Crystal structure
Lattice
Basis
None
BCC structure has APF
52
68
74
none
APF has been calculated based on the asumption that atoms spherical in nature and touching each ; is it
true
false
Which crystal structure does the picture show?
BBC (British Broadcasting Company)
BCC (Body Center Cubic)
SC (Simple Cubic)
FCC (Face-Centered Cubic)
Identify the Unit Cell
simple cubic
BCC
FCC
HCP
Choose the correct answer
some ceramic materials are crystalline, whereas others—the inorganic glasses—are amorphous.
Polymers may be completely noncrystalline or semicrystalline consisting of varying degrees of crystallinity
Metals normally form crystalline solids
All of above answers
Each table shows differentiation between ionic bonds, covalent bonds, and metallic bonds. Choose the correct answer.
