Strength of Materials

121. If 'p' is the internal pressure in a thin cylinder of diameter 'd' and thickness 't', the developed hoop stress, is

  1. pd/2t
  2. pd/4t
  3. pd/t
  4. 2pd/t

Correct answer: (A)
pd/2t

122. If rain is falling in the opposite direction of the movement of a pedestrian, he has to hold his umbrella

  1. More inclined when moving
  2. Less inclined when moving
  3. More inclined when standing
  4. Less inclined when standing

Correct answer: (D)
Less inclined when standing

123. If 'S' is the shear force at a section of an I-joist, having web depth 'd' and moment of inertia 'l' about its neutral axis, the difference between the maximum and mean shear stresses in the web is,

  1. Sd2/8I
  2. Sd2/12I
  3. Sd2/16I
  4. Sd2/24I

Correct answer: (D)
Sd2/24I

124. If the beam is supported so that there are only three unknown reactive elements at the supports. These can be determined by using the following fundamental equation of statics

  1. ∑H = 0
  2. ∑V = 0
  3. ∑H = 0; ∑H = 0
  4. ∑H = 0,∑V =0; ∑m=0

Correct answer: (D)
∑H = 0,∑V =0; ∑m=0

125. If the depth of a simply supported beam carrying an isolated load at its centre, is doubled, the deflection of the beam at the centre will be changed by a factor of

  1. 2
  2. 43497
  3. 8
  4. 43678

Correct answer: (D)
43678

126. If the length of a cantilever carrying an isolated load at its free end is doubled, the deflection of the free end will increase by

  1. 8
  2. 43678
  3. 43525
  4. 2

Correct answer: (B)
43678

127. If the normal cross-section 'A' of a member is subjected to tensile force 'P', the resulting normal stress in an oblique plane inclined at angle 'θ' to transverse plane will be

  1. (P/A) sin2 θ
  2. (P/A) cos2 θ
  3. (P/2A) sin 2θ
  4. (P/2A) cos 2θ

Correct answer: (B)
(P/A) cos2 θ

128. If the rivets in adjacent rows are staggered and outermost row has only one rivet, the arrangement of the rivets, is called

  1. Chain riveting
  2. Zig-zag riveting
  3. Diamond riveting
  4. None of these

Correct answer: (C)
Diamond riveting

129. If the shear force along a section of a beam is zero, the bending moment at the section is

  1. Zero
  2. Maximum
  3. Minimum
  4. Average of maximum-minimum

Correct answer: (B)
Maximum

130. If the stress in each cross-section of a pillar is equal to its working stress, it is called

  1. Body of equal
  2. Body of equal section
  3. Body of equal strength
  4. None of these

Correct answer: (C)
Body of equal strength

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