This set of Strength of Materials Multiple Choice Questions & Answers (MCQs) focuses on “Introduction to Shear Force and Bending Moment”.

1. Shear force is unbalanced _____ to the left or right of section.

a) Horizontal force

b) Vertical force

c) Inclined force

d) Conditional force

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Explanation: The shear force at the cross section of a beam may also be defined as the unbalanced vertical force to the left or right of section. It is also the algebraic sum of all the forces I get to the left to the right of the section.

2. SI units of shear force is __

a) kN/m

b) kN-m

c) kN

d) m/N

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Explanation: As shear force at any section is equal to the algebraic sum of the forces, the units of the shear force is also in kilo newtons and it is denoted by kN.

3. Determine the moment at fixed end.

a) 40 kNm

b) 50 kNm

c) 60 kNm

d) 80 kNm

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Explanation: Let the fixed end be “A”

Reaction at A = 10×4 = 40 kN

Moment at A = (10×4)×4/2

= 80 kNm.

4. Shear force is diagram is _______representation of shear force plotted as ordinate.

a) Scalar

b) Aerial

c) Graphical

d) Statically

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Explanation: Shear Force diagram is a graphical representation of the shear force plotted as ordinate on baseline representing the axis of the Beam.

5. Hogging is________

a) Negative bending moment

b) Positive shear force

c) Positive bending moment

d) Negative shear force

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Explanation: The bending moment at a section is considered to be negative when it causes convexity upwards or concavity at bottom, such bending moment is called hogging bending moment or negative bending moment.

6. At the point of contraflexure, the value of bending moment is____

a) Zero

b) Maximum

c) Can’t be determined

d) Minimum

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Explanation: A point at which bending moment changes its sign from positive to negative and vice versa. Such point is termed as point of contraflexure. At this point, the value of bending moment is zero (0).

7. _________ positive/negative bending moments occur where shear force changes its sign.

a) Minimum

b) Zero

c) Maximum

d) Remains same

View Answer

Explanation: If shear force and bending moment values obtained are thus plotted as diagram, the SF & BM relationship always behaves vice versa.

8. Shear force of following diagram

a) Rectangle

b) Square

c) Circle

d) Trapezoidal

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9. SI units of Bending moment is ____

a) kN

b) kN^{2}

c) kNm

d) km

View Answer

Explanation: Moment is product of force and perpendicular distance and the bending moment is the algebraic sum of moments taken away from the left or the right of the section hence the SI units of bending moment is same as the moment i.e kNm.

10. What is the other name for positive bending moment?

a) Hogging

b) Sagging

c) Inflation

d) Contraflexure

View Answer

Explanation: The bending moment at a section is considered to be positive when it causes convexity downwards such bending moment is called sagging bending moment positive bending moment.

**Sanfoundry Global Education & Learning Series – Strength of Materials. **

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