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MCQs

Total Questions : 90 | Page 4 of 9 pages
Question 31. Which one of the following pairs is NOT correctly matched?
  1.    Visco-elastic – small plastic zone
  2.    Orthotropic material – different properties in three perpendicular directions
  3.    Strain hardening material – stiffening effect felt at some stage
  4.    Isotropic material – same physical property in all directions at a point
 Discuss Question
Answer: Option A. -> Visco-elastic – small plastic zone
Answer: (a).Visco-elastic – small plastic zone
Question 32. What will be the elastic modulus of a material if the Poisson’s ratio for that material is 0.5?
  1.    Equal to its shear modulus
  2.    Three times its shear modulus
  3.    Four times its shear modulus
  4.    Not determinable
 Discuss Question
Answer: Option B. -> Three times its shear modulus
Answer: (b).Three times its shear modulus
Question 33. A bar of diameter 30mm is subjected to a tensile load such that the measured extension on a gauge length of 200mm is 0.09mm and the change in diameter is 0.0045mm. Calculate the Poissons ratio?
  1.    1/3
  2.    1/4
  3.    1/5
  4.    1/6
 Discuss Question
Answer: Option A. -> 1/3
Answer: (a).1/3
Question 34. A solid metal bat of uniform diameter D and length L is hung vertically from a ceiling. If the density of the material of the bar is 1 and the modulus of elasticity is E, then the total elongation of the bar due to its own weight will be ____________
  1.    L/2E
  2.    L²/2E
  3.    E/2L
  4.    E/2L²
 Discuss Question
Answer: Option B. -> L²/2E
Answer: (b).L²/2E
Question 35. The phenomenon of slow extension of materials having a constant load, i.e. increasing with the time is called
  1.    Creeping
  2.    Yielding
  3.    Breaking
  4.    None of the mentioned
 Discuss Question
Answer: Option A. -> Creeping
Answer: (a).Creeping
Question 36. What will be the ratio of Youngs modulus to the modulus of rigidity of a material having Poissons ratio 0.25?
  1.    3.75
  2.    3.00
  3.    1.5
  4.    2.5
 Discuss Question
Answer: Option D. -> 2.5
Answer: (d).2.5
Question 37. An experiment was done and it was found that the bulk modulus of a material is equal to its shear modulus. Then what will be its Poissons ratio?
  1.    0.125
  2.    0.150
  3.    0.200
  4.    0.375
 Discuss Question
Answer: Option A. -> 0.125
Answer: (a).0.125
Question 38. What will be the modulus of rigidity if the value of modulus of elasticity is 200 and Poissons ratio is 0.25?
  1.    70
  2.    80
  3.    125
  4.    250
 Discuss Question
Answer: Option B. -> 80
Answer: (b).80
Question 39. A bar of 40mm dia and 40cm length is subjected to an axial load of 100 kN. It elongates by 0.005mm. Calculate the Poissons ratio of the material of bar?
  1.    0.25
  2.    0.28
  3.    0.30
  4.    0.33
 Discuss Question
Answer: Option D. -> 0.33
Answer: (d).0.33
Question 40. What will be the approximate value of shear modulus of a material if the modulus of elasticity is 189.8 GN/m² and its Poissons ratio is 0.30?
  1.    73 GN/m²
  2.    80 GN/m²
  3.    93.3 GN/m²
  4.    103.9 GN/m²
 Discuss Question
Answer: Option A. -> 73 GN/m²
Answer: (a).73 GN/m²

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