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MCQs

Total Questions : 52 | Page 4 of 6 pages
Question 31. What is the SI unit of fracture toughness?
  1.    N m⁻²
  2.    J m⁻²
  3.    J m⁻¹
  4.    N m⁻¹
 Discuss Question
Answer: Option B. -> J m⁻²
Answer: (b).J m⁻²
Question 32. How is fracture stress defined?
  1.    MN m⁻²
  2.    J m⁻²
  3.    mm
  4.    GN m⁻¹
 Discuss Question
Answer: Option A. -> MN m⁻²
Answer: (a).MN m⁻²
Question 33. The tensile strength required to break interatomic bonds across two adjacent planes is ________
  1.    Y
  2.    Y/2
  3.    Y/4
  4.    Y/6
 Discuss Question
Answer: Option D. -> Y/6
Answer: (d).Y/6
Question 34. What is the surface energy of a crack?
  1.    ϒ
  2.    2 ϒ c
  3.    4 ϒ c
  4.    12 ϒ c
 Discuss Question
Answer: Option C. -> 4 ϒ c
Answer: (c).4 ϒ c
Question 35. Griffith theory is applicable for ______ materials.
  1.    All brittle
  2.    Perfect brittle
  3.    All ductile
  4.    Perfect ductile
 Discuss Question
Answer: Option B. -> Perfect brittle
Answer: (b).Perfect brittle
Question 36. What is the breaking stress of brittle materials?
  1.    Y/6
  2.    Y/10
  3.    Y/100
  4.    Y/1000
 Discuss Question
Answer: Option D. -> Y/1000
Answer: (d).Y/1000
Question 37. In crystalline materials, fracture occurs normal to crystallographic planes called ___________
  1.    Fracture point
  2.    Cleavage plane
  3.    Brittle plane
  4.    Crystallographic point
 Discuss Question
Answer: Option B. -> Cleavage plane
Answer: (b).Cleavage plane
Question 38. Which of the following is a point defect in crystals?
  1.    Edge dislocation
  2.    Interstitialcies
  3.    Grain boundaries
  4.    Cracks
 Discuss Question
Answer: Option B. -> Interstitialcies
Answer: (b).Interstitialcies
Question 39. The defect that occurs due to a displacement of an ion is known as __________
  1.    Vacancy defect
  2.    Schottky defect
  3.    Frankel defect
  4.    Interstitial defect
 Discuss Question
Answer: Option C. -> Frankel defect
Answer: (c).Frankel defect
Question 40. In screw dislocation, the Burger’s vector lies _________ to the dislocation line.
  1.    Perpendicular
  2.    Parallel
  3.    At an angle
  4.    Sideways
 Discuss Question
Answer: Option B. -> Parallel
Answer: (b).Parallel

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