Strength of Materials

141. In a continuous bending moment curve the point where it changes sign, is called

  1. Point of inflexion
  2. Point of contraflexure
  3. Point of virtual hinge
  4. All the above

Correct answer: (D)
All the above

142. In a loaded beam, the point of contraflexure occurs at a section where

  1. Bending moment is minimum
  2. Bending moment is zero or changes sign
  3. Bending moment is maximum
  4. Shearing force is maximum

Correct answer: (B)
Bending moment is zero or changes sign

143. In a shaft rotated by a couple, the shear force varies

  1. From zero at the centre to a maximum at the circumference
  2. From minimum at the centre of maximum at the circumference
  3. From maximum at the centre to zero at the circumference
  4. Equally throughout the section

Correct answer: (A)
From zero at the centre to a maximum at the circumference

144. In a shaft shear stress intensity at a point is not

  1. Directly proportional to the distance from the axis
  2. Inversely proportional to the distance from the axis
  3. Inversely proportional to the polar moment of inertia
  4. Directly proportional to the applied torque

Correct answer: (B)
Inversely proportional to the distance from the axis

145. In a simply supported beam (l + 2a) with equal overhangs (a) and carrying a uniformly distributed load over its entire length, B.M. at the middle point of the beam will be zero if

  1. l = 2a
  2. l = 4a
  3. l < 2a
  4. l > a

Correct answer: (A)
l = 2a

146. In a simply supported beam L with a triangular load W varying from zero at one end to the maximum value at the other end, the maximum bending moment is

  1. WL/3
  2. WL/9 √3
  3. WL/4
  4. WL3/9 √3

Correct answer: (D)
WL3/9 √3

147. In a solid arch, shear force acts

  1. Vertically upwards
  2. Along the axis of the arch
  3. Perpendicular to the axis of arch
  4. Tangentially to the arch

Correct answer: (C)
Perpendicular to the axis of arch

148. In a square beam loaded longitudinally, shear develops

  1. On middle fibre along horizontal plane
  2. On lower fibre along horizontal plane
  3. On top fibre along vertical plane
  4. Equally on each fibre along horizontal plane

Correct answer: (D)
Equally on each fibre along horizontal plane

149. In a tension test, the yield stress is 300 kg/cm2, in the octahedral shear stress at the point is:

  1. 100 √2 kg/cm2
  2. 150 √2 kg/cm2
  3. 200 √2 kg/cm
  4. 250 √2 kg/cm2

Correct answer: (A)
100 √2 kg/cm2

150. In a three hinged arch, the bending moment will be zero

  1. At right hinge only
  2. At left hinge only
  3. At both right and left hinges
  4. At all the three hinges

Correct answer: (D)
At all the three hinges

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