Strength of Materials

131. If the stress produced by a prismatic bar is equal to the working stress, the area of the crosssection of the prismatic bar, becomes

  1. Zero
  2. Infinite
  3. Maximum
  4. Minimum

Correct answer: (B)
Infinite

132. If the width b and depth d of a beam simply supported with a central load are interchanged, the deflection at the centre of the beam will be changed in the ratio of

  1. b/d
  2. d/b
  3. (d/b)2
  4. (b/d)2

Correct answer: (D)
(b/d)2

133. If the width of a simply supported beam carrying an isolated load at its centre is doubled, the deflection of the beam at the centre is changed by

  1. 2 times
  2. 4 times
  3. 8 times
  4. 1/2 times

Correct answer: (C)
8 times

134. If three forces acting in different planes can be represented by a triangle, these will be in

  1. Non-equilibrium
  2. Partial equilibrium
  3. Full equilibrium
  4. None of the above

Correct answer: (A)
Non-equilibrium

135. If three forces acting in one plane upon a rigid body, keep it in equilibrium, then they must either

  1. Meet in a point
  2. Be all parallel
  3. At least two of them must meet
  4. All the above are correct

Correct answer: (D)
All the above are correct

136. If two forces acting at a joint are not along the straight line, then for the equilibrium of the joint

  1. One of the forces must be zero
  2. Each force must be zero
  3. Forces must be equal and of the same sign
  4. Forces must be equal in magnitude but opposite in sign

Correct answer: (B)
Each force must be zero

137. If two tensile forces mutually perpendicular act on a rectangular parallelepiped bar are equal, the resulting elongation of the pipe, is

  1. (P/E) (1 - m)
  2. (E/P) (m -1)
  3. (E/P) (1 - m)
  4. (P/E) (1 + m)

Correct answer: (A)
(P/E) (1 - m)

138. If Z and I are the section modulus and moment of inertia of the section, the shear force F and bending moment M at a section are related by

  1. F = My/I
  2. F = M/Z
  3. F = dM/dx
  4. F ∫Mdx

Correct answer: (C)
F = dM/dx

139. In a bar of large length when held vertically and subjected to a load at its lower end, its ownweight produces additional stress. The maximum stress will be

  1. At the lower cross-section
  2. At the built-in upper cross-section
  3. At the central cross-section
  4. At every point of the bar

Correct answer: (B)
At the built-in upper cross-section

140. In a beam, the neutral plane

  1. May be its centre
  2. Passes through the C.G. of the area of cross-section
  3. Does not change during deformation
  4. None of these

Correct answer: (C)
Does not change during deformation

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