The neutral axis of a transverse section of a beam passes through the centre of

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Question
The neutral axis of a transverse section of a beam passes through the centre of gravity of the section and is
Options
A. in the vertical plane
B. in the horizontal plane
C. in the same plane in which the beam bends
D. at right angle to the plane in which the beam bends

Correct Answer

at right angle to the plane in which the beam bends

Strength of Materials problems

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1. When a body is subjected to a direct tensile stress (?) in one plane, then tangential or shear stress on an oblique section of the body inclined at an angle ? to the normal of the section is
Options
A. ? sin 2?
B. ? cos 2?
C. ?/2 sin 2?
D. ?/2 cos 2?

4. A square beam and a circular beam have the same length, same allowable stress and the same bending moment. The ratio of weights of the square beam to the circular beam is
Options
A. 1/2
B. 1
C. 1/1.12
D. 1/2

7. The change in length due to a tensile or compressive force acting on a body is given by (where P = Tensile or compressive force acting on the body, l = Original length of the body, A = Cross-sectional area of the body, and E = Young's modulus for the material of the body)
Options
A.
B.
C.
D.

8. A steel bar 2 m long, 20 mm wide and 10 mm thick is subjected to a pull of 2 kN. If the same bar is subjected to a push of 2 kN, the Poission's ratio of the bar in tension will be __________ the Poisson's ratio for the bar in compression.
Options
A. equal to
B. less than
C. greater than

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