Strengthening Mechanisms MCQ’s

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This set of Materials Science Multiple Choice Questions & Answers (MCQs) focuses on “Strengthening Mechanisms”.

1. Which of the following isn’t a strengthening mechanism for multi-phase materials?
a) Precipitation strengthening
b) Dispersion strengthening
c) Solid solution strengthening
d) Martensite strengthening

2. The yield strength of a material going through grain size reduction increases by a factor, k multiplied by:(where d is the diameter of grain)
a) d2
b) d1/2
c) d-1/2
d) d-2

3. Which of the following isn’t a strengthening mechanism?
a) Grain size reduction
b) Solid solution strengthening
c) Strain hardening
d) Grain size increment

4. Which of the following is not improved by grain size reduction?
a) Hardness
b) Toughness
c) Elasticity
d) strength

5. Which of the following interactions will not continue to act at about 0.6Tm? (where Tm is melting point)
a) Elastic interaction
b) Modulus interaction
c) Electrical interaction
d) Long range interaction

6. At what angle are Hartmann lines inclined to the tensile axis?
a) 45 degrees
b) 15 degrees
c) 30 degrees
d) 20 degrees

7. Which of the following is not a way of interaction between solute atoms and dislocation?
a) Elastic interaction
b) Plastic interaction
c) Modulus interaction
d) stacking fault interaction

8. Which is not a correct term for bands in yield point phenomenon?
a) Lüders bands
b) Hartmann lines
c) stretcher stains
d) Lüders lines

9. In strain hardening, the body is plastically deformed.
a) True
b) False

10. In strain hardening, there is an increase in density.
a) True
b) False

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