Q.1
Which one of the following, is not a method of introducing imperfections in metals?
  • a) Heating
  • b) Processing
  • c) Alloying
  • d) Crystallization
Q.2
Which one is a point defect?
  • a) Dislocation
  • b) Vacancy
  • c) Grain boundary
  • d) Void
Q.3
Which point defect is known as equilibrium defect?
  • a) Void
  • b) Dislocation
  • c) Interstitial
  • d) Vacancy
Q.4
Identify the defect for the below diagram.
Questionmechanical-behaviour-testing-materials-questions-answers4.jpg
  • a) Frankel
  • b) Schottky
  • c) Interstitialcy
  • d) Vacancy
Q.5
Identify the defect for the below diagram.
Questionmechanical-behaviour-testing-materials-questions-answers5.jpg
  • a) Interstitial
  • b) Substitutional
  • c) Interstitialcy
  • d) Schottky
Q.6
Substitutional atoms are generally close in size (approximately 15%) to the parent metal atoms.
  • a) True
  • b) False
Q.7
Which one is not an example of interstitial impurity?
  • a) Carbon in iron
  • b) Zinc in brass
  • c) Hydrogen in Palladium
  • d) Nitrogen in iron
Q.8
If the atom is transferred to an interstitial position instead of the surface, then this defect is known as _____
  • a) Interstitial
  • b) Frankel
  • c) Schottky
  • d) Vacancy
Q.9
In interstitial defect, the atoms surrounding the defect are in the state of tension.
  • a) True
  • b) False
Q.10
For copper, the ratio between interstitial formation enthalpy and the energy required to create a vacancy is _____________
  • a) 3:1
  • b) 2:1
  • c) 1:1
  • d) 1:2
Q.11
Match the following: i) Oxidation of copper a) Frankel ii) Neutron irradiation causes b) vacancy iii) GaAs (anti site defect) c) interstitialcy iv) Steel (C in Fe) d) interstitial
  • a) i-b, ii-d, iii-a, iv-c
  • b) i-b, ii-c, iii-a, iv-d
  • c) i-c, ii-b, iii-a, iv-d
  • d) i-d, ii-c, iii-a, iv-b
Q.12
Which alloy system shows complete solubility?
  • a) Cd-Mg
  • b) Cu-Zn
  • c) Fe-Ni
  • d) Cu-Sn
0 h : 0 m : 1 s