Shear Force and Bending Moment

JKSSB Junior Engineer (Civil) · Mechanics and Structural Analysis · 17 practice questions with answers and explanations: 10 Easy, 7 Medium, 0 Hard.

Sample questions

Sample Easy question 1

At the point of contraflexure of a beam:

  1. The bending moment changes sign
  2. The deflection is maximum
  3. The slope is zero
  4. The shear force is zero
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Answer: A. The bending moment passes through zero and the curvature reverses.

Sample Easy question 2

The shear force at a section is the:

  1. Rate of change of bending moment
  2. Square of the moment
  3. Rate of change of load
  4. Integral of the deflection
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Answer: A. V = dM ÷ dx.

Sample Easy question 3

The fixed-end moment for a fixed beam of span L carrying a uniformly distributed load w is:

  1. wL² ÷ 12
  2. wL² ÷ 2
  3. wL² ÷ 8
  4. wL² ÷ 24
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Answer: A. For L = 6 m and w = 12 kN/m the fixed-end moment is 36 kN·m.

Sample Medium question 4

A beam overhangs its support by 2 m and carries a UDL of 10 kN/m on the overhang. The bending moment at the support is:

  1. 20 kN·m
  2. 40 kN·m
  3. 5 kN·m
  4. 10 kN·m
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Answer: A. M = wL² ÷ 2 = 10 × 4 ÷ 2 = 20 kN·m (hogging).

Sample Medium question 5

A simply supported beam of 4 m span carries a central point load of 40 kN. The maximum bending moment is:

  1. 80 kN·m
  2. 20 kN·m
  3. 160 kN·m
  4. 40 kN·m
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Answer: D. M = WL ÷ 4 = 40 × 4 ÷ 4 = 40 kN·m.

Sample Medium question 6

A simply supported beam of 5 m span carries a uniformly distributed load of 12 kN/m. The maximum bending moment is:

  1. 150 kN·m
  2. 18.75 kN·m
  3. 75 kN·m
  4. 37.5 kN·m
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Answer: D. M = wL² ÷ 8 = 12 × 25 ÷ 8 = 37.5 kN·m.

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