Structural Mechanics Set 3

Civil Engineering

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This set of Structural Mechanics Multiple Choice Questions & Answers (MCQs) focuses on Structural Mechanics Set 3

Q1 | Which type of load is applied in tensile testing?
  • Axial load
  • Shear load
  • Transverse load
  • Longitudinal load
Answer: Transverse load
Q2 | Which law is also called as the elasticity law?
  • Bernoulli’s law
  • Stress law
  • Hooke’s law
  • Poisson’s law
Answer: Hooke’s law
Q3 | The materials which have the same elastic properties in all directions are called __________
  • Isotropic
  • Brittle
  • Homogeneous
  • Hard
Answer: Isotropic
Q4 | The calculation of the moment of the body due to the loadings involve a quantity called ____________
  • Moment
  • Inertia
  • Moment of Inertia
  • Rotation
Answer: Moment of Inertia
Q5 | Moment of Inertia is the integration of the square of the distance of the centroidand the del area along the whole area of the structure.
  • TRUE
  • FALSE
  • none
  • all
Answer: TRUE
Q6 | What is parallel axis theorem and to whom it is applied?
  • Theorem used to add the two mutually perpendicular moment of inertias for areas
  • Theorem used to add the two mutually perpendicular moment of inertias for volumes
  • Theorem used to add the two mutually perpendicular moment of inertias
  • Theorem used to add the two mutually perpendicular moment of inertias for vectors
Answer: Theorem used to add the two mutually perpendicular moment of inertias for areas
Q7 | The parallel axis theorem gives the moment of inertia ______________ to the surface of considerance.
  • Linear
  • Non-Linear
  • Perpendicular
  • Parallel
Answer: Perpendicular
Q8 | In the calculation of the radius of gyration, we use intensity of loadings. So whenever the distributed loading acts perpendicular to an area its intensity varies __________
  • Linearly
  • Non-Linearly
  • Parabolically
  • Cubically
Answer: Linearly
Q9 | Elongation of a bar of uniform cross section of length „L?, due to its own weight „W? is given by
  • 2WL/E
  • WL/E
  • WL/2E
  • WL/3E
Answer: WL/2E
Q10 | steel bar 10 mm x 10 mm cross section is subjected to an axial tensile load of 20kN. If the length of bar is 1 m and E = 200 GPa, then elongation of the bar is:
  • 1 mm
  • 0.5 mm
  • 0.75 mm
  • 1.5 mm
Answer: 0.75 mm
Q11 | The modulus of rigidity and poisson?s ratio of a material are 80 GPa and 0.3 respectively. Its young?s modulus will be
  • 160 GPa
  • 208 GPa
  • 120 GPa
  • 104 GPa
Answer: 104 GPa
Q12 | If the value of poisson?s ratio is zero
  • the lateral strain is high
  • the material is perfectly elastic
  • there is no linear strain in the material
  • none of the above
Answer: there is no linear strain in the material
Q13 | The ratio between direct stress and volumetric strain is:
  • Bulk modulus
  • Poisson’s ratio
  • Factor of safety
  • Modulus of rigidity
Answer: Bulk modulus
Q14 | Young?s modulus of a material which gives 2 kN/mm2 stress at 0.01 strainis
  • 20kN/mm2
  • 0.02kN/mm2
  • 200 kN/mm2
  • 2000kN/mm2
Answer: 200 kN/mm2
Q15 | The Young?s modulus of elasticity of a material is 2.5 times its modulus of rigidity. The Poisson?s ratio for the material will be
  • 0.25
  • 0.33
  • 0.5
  • 0.75
Answer: 0.25
Q16 | Consider a 250mmx15mmx10mm steel bar which is free to expand is heated from 150C to 400C. what will be developed?
  • Compressive stress
  • Tensile stress
  • Shear stress
  • No stress
Answer: No stress
Q17 | The safe stress for a hollow steel column which carries an axial load of 2100 kN is 125 MN/m2. if the external diameter of the column is 30cm, what will be the internal diameter?
  • 25 cm
  • 26.19cm
  • 30.14 cm
  • 27.9 cm
Answer: 26.19cm
Q18 | The percentage reduction in area of a cast iron specimen during tensile test would be of the order of
  • more than 50%
  • 25—50%
  • 10—25%
  • negligible.
Answer: negligible.
Q19 | In a tensile test, near the elastic limit zone, the
  • tensile strain increases more quickly
  • tensile strain decreases more quickly
  • tensile strain increases in proportion to the stress
  • tensile strain decreases in proportion to the stress
Answer: tensile strain increases more quickly
Q20 | The stress necessary to initiate yielding is
  • considerably greater than that necessary to continue it
  • considerably lesser than that necessary to continue it
  • greater than that necessary to stop it
  • lesser than that necessary to stop it
Answer: considerably greater than that necessary to continue it
Q21 | Rupture stress is
  • breaking stress
  • maximum load/original cross-sectional area
  • load at breaking point/A
  • load at breaking point/neck area
Answer: load at breaking point/neck area
Q22 | stress at which extension of material takes place more quickly as comparedto increase in load is called
  • elastic point of the material
  • plastic point of the material
  • breaking point of the material
  • yielding point of the material
Answer: yielding point of the material
Q23 | The energy absorbed in a body, when it is strained within the elastic limits,is known as
  • strain energy
  • resilience
  • proof resilience
  • modulus of resilience
Answer: strain energy
Q24 | Resilience of a material is considered when it is subjected to
  • frequent heat treatment
  • fatigue
  • creep
  • shock loading
Answer: shock loading
Q25 | The maximum strain energy that can be stored in a body is known as
  • impact energy
  • resilience
  • proof resilience
  • modulus of resilience
Answer: proof resilience
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