Structural Mechanics Set 6

Civil Engineering

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This set of Structural Mechanics Multiple Choice Questions & Answers (MCQs) focuses on Structural Mechanics Set 6

Q1 | SI units of Bending moment is
  • kN
  • kN2
  • kNm
  • km
Answer: kNm
Q2 | What is the other name for a positive bending moment?
  • Hogging
  • Sagging
  • Inflation
  • Contra flexure
Answer: Sagging
Q3 | For any part of the beam, between two concentrated load Shear force diagramis a
  • Horizontal straight line
  • Vertical straight line
  • Line inclined to x-axis
  • Parabola
Answer: Horizontal straight line
Q4 | For any part of a beam subjected to uniformly distributed load, bending moment diagram is
  • Horizontal straight line
  • Vertical straight line
  • Line inclined to x-axis
  • Parabola
Answer: Parabola
Q5 | A sudden jump anywhere on the Bending moment diagram of a beam iscaused by
  • Couple acting at that point
  • Couple acting at some other point
  • Concentrated load at the point
  • Uniformly distributed load or Uniformly varying load on the beam
Answer: Couple acting at that point
Q6 | The diagram shown below, depicts bending diagram for
  • cantilever beam with uniformly distributed load
  • cantilever beam with uniformly distributed load only on half side of the beam
  • simply supported beam with varying distributed load
  • simply supported beam with uniformly distributed load
Answer: simply supported beam with uniformly distributed load
Q7 | A 10 m long cantilever beam is fixed at point B. What is the bending moment at point B, if 5 m span of AC carries uniform distributed load of 10 kN/m
  • 125 kN/m
  • 200 kN/m
  • 375 kN/m
  • 500 kN/m
Answer: 375 kN/m
Q8 | What is the maximum shear force acting on the beam shown below.
  • 125 N
  • 200 N
  • 4000 N
  • 8000 N
Answer: 200 N
Q9 | At a point in a simply supported or overhanging beam where Shear force changes sign and Bending moment is
  • Maximum
  • Zero
  • Either increasing or decreasing
  • Infinity
Answer: Maximum
Q10 | The beam having one end free and one end fixed is called as
  • Cantilever beam
  • Continuous beam
  • Overhang beam
  • Simply supported beam
Answer: Cantilever beam
Q11 | Uniformly varying load between two sections in shear force diagram isrepresented by
  • cubic curve
  • inclined line
  • horizontal line
  • parabolic curve
Answer: parabolic curve
Q12 | In bending moment diagram, if no load acts between two sections, then it isrepresented by
  • horizontal line
  • inclined line
  • vertical line
  • all of the above
Answer: inclined line
Q13 | What is the maximum bending moment acting on simply supported beamshown below?
  • 2000 Nm
  • 3000 Nm
  • 4000 Nm
  • 6000 Nm
Answer: 6000 Nm
Q14 | A beam is said to be of uniform strength, if
  • B.M. is same throughout the beam
  • Shear stress is the same through the beam
  • Deflection is the same throughout the beam
  • Bending stress is the same at every section along its longitudinal axis
Answer: Bending stress is the same at every section along its longitudinal axis
Q15 | What is the product of sectional modulus and allowable bending stress called as?
  • Moment of inertia
  • Moment of rigidity
  • Moment of resistance
  • Radius of gyration
Answer: Moment of resistance
Q16 | A uniformly distributed load of 20 kN/m acts on a simply supported beam of rectangular cross section of width 20 mm and depth 60 mm. What is the maximum bending stress acting on the beam of 5m?
  • 5030 Mpa
  • 5208 Mpa
  • 6600 Mpa
  • Insufficient data
Answer: 5208 Mpa
Q17 | Neutral axis of a beam always coincides with
  • Axis passing through bottom of beam
  • Axis passing through height h/2 from bottom
  • Axis passing through height h/3 from bottom
  • Axis passing through centroid
Answer: Axis passing through centroid
Q18 | Net force acting on the cross section of beam in bending is
  • Tensile
  • Compressive
  • Zero
  • None
Answer: Zero
Q19 | Net force acting on the cross section of beam in bending is
  • Tensile
  • Compressive
  • Shear
  • None
Answer: None
Q20 | Which is more stronger in bending equal area square or circular beam
  • Square beam
  • Circular beam
  • Both are equally strong
  • None
Answer: Circular beam
Q21 | Why is a composite beam is converted into a beam of one material
  • Bending equation is applicable to one material beam
  • Bending equation is applicable to one alloy beam
  • Bending equation is applicable to one metal beam
  • None
Answer: Bending equation is applicable to one material beam
Q22 | Bending equation is applicable to a beam of
  • Heterogeneous material
  • Homogeneous material
  • Alloy
  • None
Answer: Homogeneous material
Q23 | In a composite beam bending, strain at the common interface will be
  • Equal
  • Unequal
  • Zero
  • None
Answer: Equal
Q24 | Brittle material beams need reinforcement on the
  • Tension side
  • Compression side
  • Shear side
  • None
Answer: Tension side
Q25 | In bending, neutral axis always is
  • Perpendicular to the centroidal axis
  • Coincides with the centroidal axis
  • Parallel to the centroidal axis
  • None
Answer: Coincides with the centroidal axis
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