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Fall 2024 Structure & Properties of Materials - MANE2220Quiz #3
1. Area under the entire stress-strain curve is a measure of:
a) resilience
b) toughness
c) hardness
d) stiffness
2. Isotropic material has different magnitudes of strains in x and y directions if it is being
pulled in the z direction.
a) True
b) False
3. Shear modulus of most metals can be calculated from elastic modulus and Poisson’s
ratio.
a) True
b) False
4. Rank the magnitude of elastic modulus for the following materials. (1 = largest E)
Silicon carbide – 1
Steel - 2
Tin -- 3
Polystyrene -- 4
5. When a sample is stressed until yield stress is reached, and is then unloaded, what strain
value will the sample return to?
a) 0.000
b) 0.001
c) 0.002
d) 0.005
6. If a metal is subjected to a load beyond its ultimate tensile strength, what will happen to it?
a) neck formation
b) it will crack
c) alignment of molecules
7. Ductility generally increases with increased temperature.
a) True
b) False
, 8. Ductile failures normally exhibit deformed fracture surfaces.
a) True
b) False
9. Area under the elastic portion of stress-strain curve is a measure of the material’s:
a) resilience
b) toughness
c) hardness
d) stiffness
10. Higher hardness implies that the material is less wear resistant.
a) True
b) False
11. Hardness is defined as resistance to:
a) compression
b) indentation
c) bending
12. Which of the following class of materials has highest toughness?
a) ceramics
b) metals
c) polymers
13. Strain hardening is a characteristic feature of ceramics.
a) True
b) False
14. Which of the following class of materials have the lowest tensile strength?
a) Ceramics
b) Metals
c) Composites
d) Polymers
15. The property of a material which resists forces when it is twisted is:
a) tensile strength
b) shear strength
c) compressive strength
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