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The point of contraflexure in a loaded beam subjected to bending action is one where

This question was previously asked in
DSSSB AE Civil 26 Sept 2021 Official Paper
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  1. The shear force changes sign
  2. The bending moment is maximum
  3. The shear force is maximum
  4. The bending moment changes sign

Answer (Detailed Solution Below)

Option 4 : The bending moment changes sign
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Detailed Solution

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Explanation:

The point of contraflexure is a point where bending moment changes sign.

for example:

F1 Ram S 1-12-2020 Swati D3

Points A and B are contraflexure points.

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More Bending Moment Questions

Q1.If a cantilever beam is subjected to an upward point load at the free end, the nature of the stresses developed will be:
Q2.A cantilever beam of length 2 m is subjected to a point load of 3 kN at a distance of 2 m and is subjected to a UDL of 3 kN/m for a total distance of 1.5 m from the fixed end. Calculate the shear force and bending moment at the fixed end.
Q3.An overhanging beam CADEBF is shown in the figure below. Calculate the sum of the bending moment values at A and B. Ignore the sign conventions. 
Q4.Find the bending moment at a distance L/4 from end A of the simply supported beam as shown below.
Q5.The value of slope at fixed support of a cantilever beam of length- L, flexural rigidity- EI, subjected to a point load ‘P’ at its mid span, and another point load ‘P’ at its free end, is:
Q6.A cantilever beam carries a uniformly distributed load over a span of 1 m as shown in the figure below. The reactive moment at point A is _____.
Q7.A fixed beam subjected to a central point load against gravity, the number of points of contraflexure and their positions respectively are
Q8.A cantilever beam is subjected to a point load against gravity at its free end. The variation and nature of the bending moment will be
Q9.Which one of the following statements is correct?
Q10.A cantilever beam of span 6 m is propped at 2 m from a free end. It carries a uniformly distributed load of 10 kN/m over its entire span as shown in the given figure. Determine the free bending moment at B in the span BC.

More Shear Force and Bending Moment Questions

Q1.A simply supported beam with a span length of 5 m carries a moment of 20 N-m (counterclockwise direction) at the middle of the beam. What will the value of reactions be at both the ends of the beam?
Q2.What will be the shape of the bending moment diagram for a cantilever beam carrying a uniformly distributed load throughout its length?
Q3.A cantilever beam with a span length of L m carries a uniform moment of intensity ‘M’ N-m/m. Which of the following statements is correct?
Q4.A simply supported beam with a span length of 4 m carries a uniform load of intensity 5 N/m throughout its length. What will the value of the maximum bending moment (in N - m) in the beam be?
Q5.For a cantilever beam of length 'L' subjected to a uniformly distributed load (UDL) W (kN/m) over its entire length, what is the bending moment at the fixed end? 
Q6.Which type of support allows only rotational movement but resists both horizontal and vertical forces?
Q7.A simply supported beam of 8 m has two vertical point loads: 10 kN at 2 m from the left support, 10 kN at 6 m from the left support. Using the graphical method, what is the approximate reaction at the left support (RA)? 
Q8.A simply supported beam of 10 m carries a uniformly distributed load (UDL) of 5 kN/m over its entire span. What is the reaction force at each support? 
Q9.A simply supported beam of span '5 m' has a moment '100 kN-m' acting at mid span. The reaction at each support is:
Q10.Assume AB = BC= 1 m for the following beam : What will be the vertical reaction at point B?
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More Strength of Materials Questions

Q1.What will be the nature of longitudinal stress in a thin closed cylinder containing hydrostatic fluid pressure?
Q2.A steel bar (E = 200E = 200, α = 12 × 10 − 6/°C) expands by 0.3 mm due to  a temperature increase. If the original length of the bar was 15 cm, what was the temperature rise?
Q3.In the Charpy impact test, the specimen is typically:
Q4.Which of the following represents the polar modulus of the hollow shaft? [ If Do = External diameter and Di = Internal diameter ]
Q5.A simply supported beam with a span length of 5 m carries a moment of 20 N-m (counterclockwise direction) at the middle of the beam. What will the value of reactions be at both the ends of the beam?
Q6.What will be the shape of the bending moment diagram for a cantilever beam carrying a uniformly distributed load throughout its length?
Q7.If a component has a Factor of Safety (FoS) of 1.0, what does it indicate?
Q8.If elastic strength increases 3 times, then Proof Resilience:
Q9.If the external diameter of a hollow shaft is three times greater than its internal diameter, what is the ratio of its torque-carrying capacity compared to that of a solid shaft of identical material and the same outer diameter?
Q10.For a thin planar ring of radius ‘r’ mm and thickness ‘t’ mm, its radius of gyration about the polar axis in mm is:
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