# Civil Engineering - Strength of Materials - Discussion

### Discussion :: Strength of Materials - Section 4 (Q.No.32)

32.

In a continuous bending moment curve the point where it changes sign, is called

 [A]. point of inflexion [B]. point of contraflexture [C]. point of virtual hinge [D]. all the above.

Explanation:

No answer description available for this question.

 Deb said: (Jun 20, 2017) I think it should be only B.

 Vardhan said: (Aug 15, 2017) Yes, B is correct.

 Indu said: (Aug 27, 2017) Point of inflexion means where the shear force changes its sign, the point of a virtual hinge is about virtual work, the point of contra flexure means. Where the bending moment changes its sign. So, option B is correct.

 Kalyani said: (Oct 19, 2017) Yes, B is correct.

 Joydeep said: (Jul 11, 2018) @Indu. Point of inflexion means, that point where BM is 0 ( either BM changed sign or not ) In simply supported beam, always BM is 0 at support, this point is called a point of inflexion, & where BM changed sign only this point is called a point of contra flexture. We say that every point of contra flexure is the point of inflexion, but all point of inflexion does not point of contra flexure.

 Ayesha said: (Aug 9, 2019) Where BM changes its sign from +ve to -ve or -ve to +ve is called point of contraflexure and where deflection curve changes its nature from convex to concave or concave to convex is called point of inflection. What about point of virtual hinge? Can anybody explain?

 Jinish said: (Aug 14, 2019) Point of inflexion means:where BM change sign or concave to convex or point of the curve were downward to upward moment of curve and vice versa. Point of contra flexure: where BM is zero where bending moment curve intersects zero bending moment line. Point of virtual hinge: in continues beam, we have to provide construction etc type so it's an original joint together at the point where one can swing relative to the other.

 Kaku said: (Aug 4, 2021) Given answer is correct.