Materials 1 Flashcards
Which of the following is a secondary atomic bond?
A) covalent bond
B) ionic bond
C) van der waals bond
D) hydrogen bond
D) hydrogen bond
What method can be used to determine the crusts structure of a solid?
a) Hall effect measurement
b) X-ray diffraction
c) Optical microscopy
d) Fluorescence spectroscopy
B) X-ray diffraction
Q3 What type of material has the highest electrical resistivity
a) Metal
b) Superconductor
c) Semiconductor
d) Insulator
D) insulator
Q4 What type of element is iron (Fe)?
a) Rare earth
b) Transition Metal
c) Halogen
d) Noble Gas
B) transition metal
Q5 What term describes heating of a metal to alter the microstructure and alter the mechanical properties
a) Quenching
b) Work hardening
c) Annealing
d) Peening
C) annealing
Which of the following best describes low cycle fatigue?
A) stresses are below yield but number or cycles is much greater than 10^(4)
B) The stresses in each cycle are low and the number of cycles to failure is low (typically less than 104)
C) Stresses are above yield and the number of cycles to failure is low (typically
less than 104)
D) Stresses are4tensile only and the number of cycles to failure is low (typically less than 10 ).
C) Stresses are above yield and the number of cycles to failure is low (typically
less than 104)
The stress at which a sample fails in a tensile test is best described as: (a) The yield stress
(b) The ultimate tensile strength (c) The fracture strength
(d) The plastic stress
C) fracture strength
Which of these is a universal definition of materials in the plastic regime: (a) Stress is non-linearly related to strain
(b) The atoms move relative to one another
(c) This is the regime before the ultimate fracture occurs
(d) Permanent deformation is occurring
D permanent deformation is occurring
The mechanism by which yield occurs in ductile metals is best described by:
(a) Normal stress reaches a critical level and opens up a series of small cracks
(b) Shear stress reaches a critical level and causes permanent slip between planes of
atoms
(c) Shear stress reaches a critical level and propagates a single crack through the specimen
(d) Necking (and cup and cone failure) occur in response to a high hydrostatic stress state
B) shear stress reaches a critical level and causes permanent slip between planes of atoms
If a metal is subjected to repeated cycles of loading (>104 cycles), the following best describes what can happen to the tensile strength of the material:
(a) The material will fail when the Von Mises yield criterion predicts failure
(b) The material will fail at its tensile strength as determined from monotonic tensile
testing
C) The material will likely fail at a stress much lower than its nominal tensile strength as determined from monotonic tensile testing
(d) The material strength will be unaffected by the loading
C) The material will likely fail at a stress much lower than its nominal tensile strength as determined from monotonic tensile testing
Q11 An element has the electron configuration 1s22s22p63s23p5 In which group of the periodic table is it found?
a) Alkaline earth metals b) Noble gases
c) Transition metals
d) Halogens
7 outer electrons so must be a halogen (d)
Which metal has the lowest melting point?
a) W b) Fe c) Hg d) Cu
C) Hg
Which statement best describes an Anisotropic material?
a) The atoms are arranged in regularly repeating lattice
b) There is no long-range order between atoms
c) The properties of the material strongly depend on direction d) The material assumes its original shape after deformation
C) the properties of the material strongly depend on the direction
How many atoms are in the body-centred cubic (BCC) unit cell?
a) 2
b) 4 c) 6 d) 9
A) 2
What method allows determination of the carrier type and concentration in a semiconductor? a) Hall effect
b) X-ray diffraction
c) Electron microscopy
d) Infrared spectroscopy
A) Hall effect
