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MCQs

Total Questions : 90 | Page 1 of 9 pages
Question 1. The Youngs modulus of elasticity of a material is 2.5 times its modulus of rigidity. Then what will be its Poissons ratio?
  1.    0.25
  2.    0.33
  3.    0.50
  4.    0.60
 Discuss Question
Answer: Option A. -> 0.25
Answer: (a).0.25
Question 2. How many elastic constants does an isotropic, homogeneous and linearly elastic material have?
  1.    1
  2.    2
  3.    3
  4.    4
 Discuss Question
Answer: Option B. -> 2
Answer: (b).2
Question 3. Which of the following is true if the value of Poisson’s ratio is zero?
  1.    The material is rigid
  2.    The material is perfectly plastic
  3.    The longitudinal strain in the material is infinite
  4.    There is no longitudinal strain in the material
 Discuss Question
Answer: Option A. -> The material is rigid
Answer: (a).The material is rigid
Question 4. How the elastic constants E and K are related?
  1.    E = 2K(1 – 2μ)
  2.    E = 3K(1 – 2μ)
  3.    E = 2K(1 – μ)
  4.    E = K(1 – 2μ)
 Discuss Question
Answer: Option B. -> E = 3K(1 – 2μ)
Answer: (b).E = 3K(1 – 2μ)
Question 5. The modulus of rigidity and the modulus of elasticity of a material are 80 GPa and 200 GPa. What will be the Poissons ratio of the material?
  1.    0.25
  2.    0.30
  3.    0.40
  4.    0.50
 Discuss Question
Answer: Option A. -> 0.25
Answer: (a).0.25
Question 6. If E,G and K have their usual meanings, for an elastic material, then which one of the following be possibly true?
  1.    G = 2K
  2.    G = K
  3.    K = E
  4.    G = E = K
 Discuss Question
Answer: Option C. -> K = E
Answer: (c).K = E
Question 7. If a material had a modulus of elasticity of 2.1 kgf/cm² and a modulus of rigidity of 0.8 kgf/cm² then what will be the approximate value of the Poissons ratio?
  1.    0.26
  2.    0.31
  3.    0.47
  4.    0.43
 Discuss Question
Answer: Option B. -> 0.31
Answer: (b).0.31
Question 8. What is the relationship between the linear elastic properties Youngs modulus, bulk modulus and rigidity modulus?
  1.    1/E = 9/k + 3/G
  2.    9/E = 3/K + 1/G
  3.    3/E = 9/K + 1/G
  4.    9/E = 1/K + 3/G
 Discuss Question
Answer: Option D. -> 9/E = 1/K + 3/G
Answer: (d).9/E = 1/K + 3/G
Question 9. Which of the relationship between E, G and K is true, where E, G and K have their usual meanings?
  1.    E = 9KC / (3K + C)
  2.    E = 9KC / (9K + C)
  3.    E = 3KC / (9K + C)
  4.    E = 3KC / (3K + C)
 Discuss Question
Answer: Option A. -> E = 9KC / (3K + C)
Answer: (a).E = 9KC / (3K + C)
Question 10. Consider the following statements:
1. Two-dimensional stresses applied to a thin plater in its own plane represent the plane stress condition.
2. Normal and shear stresses may occur simultaneously on a plane.
3. Under plane stress condition, the strain in the direction perpendicular to the plane is zero.
Which of the above statements are correct?
  1.    2 only
  2.    1 and 2
  3.    2 and 3
  4.    1 and 3
 Discuss Question
Answer: Option D. -> 1 and 3
Answer: (d).1 and 3

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