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WorksheetsENG1008 Materials Term 1 Quick Revision
Total questions: 16
Worksheet time: 8mins
Junning fell off his bike and injured his femur. Under X-ray, some hairline fractures can be seen in the bone, which can be considered as microscopic flaws and cracks in the material. Under which of the following load type, the material is least likely to rupture?
Tension
Compression
Torsion
Shear
Bone consists of calcium phosphate and collagen (long carbon chain protein). Which of the material family does it belong to?
Metals and Alloys
Ceramics
Polymers
Composites
Bone can only sustain little deformation. If Junning is not careful, his femur is likely to fail in which of the following types?
Excessive elastic deformation
Excessive plastic deformation
Ductile Fracture
Brittle Fracture
An element that has the electron configuration 1s22s22p3 has (a) electrons.
Ideally speaking, bonds tend to form between two particles such that they are separated by a distance where _______ net force is exerted on them, and their overall energy is _________.
a zero, maximized
a non-zero, maximized
a zero, minimized
a zero, maximized
Why do ionic bonds form?
So that the number of protons equals the number of electrons
So that an atom can become unstable
To fill the outermost energy level
To share valence electrons with a neighbouring atom
The coordination number of a hexagonal closed packed structure is (a) .
The body-centred cubic structure has ___ atoms in the unit cell.
1
2
3
4
A metallic material with a BCC structure will have material properties that are __________ in the unit cell and the material is likely to be _________ at the macroscopic level.
isotropic, isotropic
isotropic, anisotropic
anisotropic, isotropic
anisotropic, anisotropic
Which of the following conditions are used to govern the formation of a substitutional solid solution?
Difference in atomic radius < 15%
Large difference in electronegativity
Higher solute valency
Crystalline structure should be the same
Strain has units of...
metres, m
Newtons, N
Pascals, Pa
nothing
The equation to find a change in length for a linear-elastic material is given by:
Δl = EA0Fl0
Δl = EFAl0
Δl = FA0El0
Δl = A0l0EF
Consider a metal beam bending under a load. What are the labels for A and B shown in the figure that describe the stress in the beam at these points?
A: Tension, B: Compression
A: Compression, B: Tension
A: Tension, B: Tension
A: Compression, B: Compression
The Poisson ratio ν is a measure of a material's...
deformation in the direction of a uniaxial load
deformation in the direction transverse to a uniaxial load
deformation in the direction tangent to a uniaxial load
deformation in the direction perpendicular to a uniaxial load
The stress-strain curves below represent: red for ____ stress/strain; blue for _____ stress/strain.
true, true
engineering, true
true, engineering
engineering, engineering
On the following stress-strain graph, which region denotes the elastic/plastic strain, and which is recovered after fracture?
A: elastic, not recovered; B plastic, recovered
A: elastic, recovered; B plastic, not recovered
A: plastic, not recovered; B elastic, recovered
A: plastic, recovered; B elastic, not recovered
