Which of the following is the name given to the axis of the cross-section a beam at which the bending stress is zero ?

86) What is the amount of stress induced in a 5 mm steel bar of length 2 m when heated from 20 Degree C to 140 Degre C while it is free to expand ?

87) The maximum energy that can be absorbed per unit volume without creating a permanent distortion is called

88) Which of the following describes a single load or force that has a small contact area as to be negligible compared with the entire surface area of the supporting member?

89) When a material has uniform properties in all directions or orientations, then it is called