Point Defects – 1 MCQ’s

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This set of Materials Science Multiple Choice Questions & Answers (MCQs) focuses on “Point Defects – 1″.

1. Which of the following point defects can be attributed to from the below options?
i) Stress Fields
ii) Strain fields
iii) Charge
iv) Current
a) i) and ii)
b) ii) and iv)
c) i) and iii)
d) ii) and iv)

2. Which is not a name given to vacancy in some ionic solid?
a) H-center
b) F-center
c) Color center
d) Luminescence center

3. Which type of defect are point defects?
a) One dimensional defect
b) Zero dimensional defect
c) Two dimensional defect
d) Three dimensional defect

4. What is the color of zinc oxide?
a) Blue
b) Red
c) Yellow
d) Orange

5. F-centers are _________
a) Cathodic vacancy in a crystal occupied by one or more paired electron
b) Cathodic vacancy in a crystal occupied by one or more unpaired electron
c) Anionic vacancy in a crystal occupied by one or more paired electron
d) Anionic vacancy in a crystal occupied by one or more unpaired electron

6. Schottky and Frenkel defects are ___________
a) Interstitial and vacancy defects respectively
b) Vacancy and interstitial defect respectively
c) Both interstitial defects
d) Both vacancy defects

7. If the number of F-centers are more, the color of the compound gets more intense.
a) True
b) False

8. In which of the following defect the density of the crystal is affected?
a) Schottky defect
b) Frenkel defect
c) Stone-Wales defect
d) Antisite defect

9. Which of the following compound shows both Schottky and frenkel defect?
a) Silver(I) iodide
b) Silver(I) bromide
c) Magnesium sulphide
d) Titanium oxide

10. The presence of interstitial carbon atom increases the hardness of which of the following:
a) Martensite
b) Austenite
c) Cementite
d) Pearlite

11. In which of the following case the first element can occupy both lattice position and interstitial position?
a) Cu in FCC-Ni
b) C in FCC-Fe
c) B in steel
d) Al in FCC-Fe

12. For the given magnitude of shift which of the following can cause the formation of an off-center ion?
a) 0.1 Å
b) 0.05 Å
c) 0.5 Å
d) 1.1 Å

13. How are point defects classified based on the source of the atom?
a) Statistical and structural
b) Random and ordered
c) Intrinsic and extrinsic
d) Interior and exterior

14. At temperatures greater than 570 degree centigrade, which of the following can be a stable composition of iron oxide?
a) Fe0.99O
b) Fe0.9O
c) Fe0.96O
d) Fe0.97O

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