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6. The point of contraflexure is a point where a. Shear force is changes its sign b. Bending moment changes sign c. Shear force is maximum d. Bending moment is maximum 7. The section modulus of a circular section of diameter "d" is а. π/32 d³ b. π/32 d² C. π/32 d4 d. π/32 ds 8. In rectangular section the ratio of maximum shear stress to the average shear stress a. 2.0 b. 1.75 c. 1.5 d. 1.25 9. In the theory of simple bending, the bending stress in the beam section varies a. Linearly b. Parabolically c. Elliptically d. constant 10. In a rectangular section, the maximum shear stress occurs at a. Apex of the triangle b. Mid of the height c. 1/3 of the height d. Base of the triangle