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Fall 2024 Structure & Properties of Materials - MANE2220Quiz #5
Part 1
1. What are the two criteria that determine the crystal structure of ceramics?
a) magnitude of electrical charge and relative sizes of ions
b) electronegativity and relative sizes of ions
c) magnitude of electrical charge and electronegativity of ions
2. Typical glasses are found to have crystalline structure.
a) True
b) False
3. Ceramics are generally not abrasion resistant.
a) True
b) False
4. Ceramics are widely used as sensor materials.
a) True
b) False
5. Coordination number of ionic compounds _______ with increasing cation-to-anion radius
ratio.
a) increases
b) decreases
c) stays the same
6. Interstitial sites are commonly found for anions.
a) True
b) False
7. Vacancies in ceramics exist for:
a) cations only
b) anions only
c) both cations and anions
8. Which of the following allotropic form of carbon is a wrapped-up graphene sheet?
a) diamond
b) graphite
c) Carbon nanotube
9. Dislocation motion is NOT easy in ceramics crystals.
, a) True
b) False
10. What is the purpose of tempering glass?
a) Introduce porosity
b) Suppress failure due to surface cracks
c) Put glass surface under torsion stress
11. Which of the following is NOT an advantage of ceramic parts?
a) Easy to form and machine
b) Can operate at high temperatures
c) Low frictional losses
12. Glass is amorphous and does not have a specific melting temperature.
a) True
b) False
13. Which type of defect involves a pair of vacant cation and anion?
a) Schottky defect
b) Frenkel defect
c) Interstitial defect
d) none of the given choices
14. Which type of defect involves a cation-vacancy and cation-interstitial pair?
a) Schottky defect
b) Frenkel defect
c) Interstitial defect
d) none of the above
15. Amorphous silica is chemically reactive in nature.
a) True
b) False
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