15 Questions
Which of the following best describes a metal?
A solid, shiny material that is typically hard, malleable, and ductile with good electrical and thermal conductivity
Which type of cast iron has the highest strength and wear resistance?
White cast iron
What is the primary difference between a thermoplastic polymer and a thermosetting polymer?
Thermoplastics can be reshaped by heating, while thermosets cannot be reshaped once formed
What is the main component that differentiates an alloy from a pure metal?
Two or more metals
What is the meaning of the term $\text{polymer}$?
Many units
Which of the following is true about the atomic packing factor (APF) for different crystal structures?
The APF for FCC and HCP structures is the same, which is 0.74.
Which of the following statements about metallic solids is incorrect?
They are typically hard, but not malleable or ductile.
What is the term used to describe materials that have two or more distinct crystal structures?
Polymorphism
Which of the following statements about covalent solids is correct?
They are made up of atoms that are bonded by covalent bonds, forming a giant network solid.
In the context of crystal structures, what is the meaning of the term 'unit cell'?
It is the smallest portion of a crystal lattice that, when repeated in three dimensions, generates the entire crystal structure.
Which of the following statements about molecular solids is incorrect?
The molecules in molecular solids are held by strong covalent bonds.
Which of the following crystal structures has the lowest atomic packing factor (APF)?
Simple cubic (SC)
Which of the following statements about ionic solids is correct?
They are made up of positively and negatively charged ions arranged in a regular fashion, held by strong electrostatic forces of attraction.
Which of the following statements about polycrystalline materials is correct?
They are made up of multiple grains, each of which is a single crystal, and if the grains are randomly oriented, the overall properties are isotropic.
Which of the following materials has a simple cubic (SC) crystal structure?
Polonium (Po)
This quiz covers metals, alloy composites, ceramics, thermoplastic polymers, thermosetting polymers, and elastomers. Learn about the definitions and characteristics of these materials commonly used in engineering.
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