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MCQs

Total Questions : 52 | Page 5 of 6 pages
Question 41. _______ occurs when a foreign substance replaces an atom in a crystal.
  1.    Vacancy defect
  2.    Substitutional impurity
  3.    Frankel defect
  4.    Interstitial impurity
 Discuss Question
Answer: Option B. -> Substitutional impurity
Answer: (b).Substitutional impurity
Question 42. A disturbance in a region between two ideal parts of a crystal is known as ________
  1.    Boundary defect
  2.    Point defect
  3.    Line defect
  4.    Volume defect
 Discuss Question
Answer: Option C. -> Line defect
Answer: (c).Line defect
Question 43. Generation of dislocations can be identified using _______
  1.    Schottky mechanism
  2.    Burger’s vector
  3.    Twist
  4.    Frank-Read mechanism
 Discuss Question
Answer: Option D. -> Frank-Read mechanism
Answer: (d).Frank-Read mechanism
Question 44. How is the dislocation energy defined?
  1.    J m⁻¹
  2.    J m⁻²
  3.    m⁻²
  4.    N m⁻¹
 Discuss Question
Answer: Option A. -> J m⁻¹
Answer: (a).J m⁻¹
Question 45. What are one-dimensional defects?
  1.    Boundary defect
  2.    Point defect
  3.    Line defect
  4.    Volume defect
 Discuss Question
Answer: Option C. -> Line defect
Answer: (c).Line defect
Question 46. What are two-dimensional defects?
  1.    Boundary defect
  2.    Point defect
  3.    Line defect
  4.    Volume defect
 Discuss Question
Answer: Option A. -> Boundary defect
Answer: (a).Boundary defect
Question 47. Which code is followed by the corrosion of metals?
  1.    Burger’s vector
  2.    Pilling–Bedworth
  3.    Frank-Read mechanism
  4.    Miller’s theorem
 Discuss Question
Answer: Option B. -> Pilling–Bedworth
Answer: (b).Pilling–Bedworth
Question 48. The fracture resistance of a material is defined as its ________
  1.    Fracture strength
  2.    Fracture toughness
  3.    Fracture hardness
  4.    Fracture resilience
 Discuss Question
Answer: Option B. -> Fracture toughness
Answer: (b).Fracture toughness
Question 49. What is Gc with reference to Griffith Theory?
  1.    Stress energy released
  2.    Strain energy released
  3.    Energy density
  4.    Griffith constant
 Discuss Question
Answer: Option B. -> Strain energy released
Answer: (b).Strain energy released
Question 50. What is the fracture toughness of aluminum alloy?
  1.    2 J m⁻²
  2.    3 J m⁻²
  3.    4 J m⁻²
  4.    6 J m⁻²
 Discuss Question
Answer: Option B. -> 3 J m⁻²
Answer: (b).3 J m⁻²

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