Strength of Materials

171. Pick up the incorrect statement

  1. The cross-sectional area of the welded member is effective
  2. A welded joint develops strength of its parent metal
  3. Welded joints provide rigidity
  4. Welding takes more time than riveting

Correct answer: (D)
Welding takes more time than riveting

172. Pick up the incorrect statement from the following:

  1. The C.G. of a circle is at its center
  2. The C.G. of a triangle is at the intersection of its medians
  3. The C.G. of a rectangle is at the intersection of its diagonals
  4. The C.G. of a semicircle is at a distance of r/2 from the center

Correct answer: (D)
The C.G. of a semicircle is at a distance of r/2 from the center

173. Pick up wrong statement about friction force for dry surfaces. Friction force is

  1. Proportional to normal load between the surfaces
  2. Dependent on the materials of contact surface
  3. Proportional to velocity of sliding
  4. Independent of the area of contact surfaces

Correct answer: (C)
Proportional to velocity of sliding

174. Rankine-Golden formula accounts for direct as well as buckling stress and is applicable to

  1. Very long columns
  2. Long columns
  3. Short columns
  4. Intermediate columns

Correct answer: (D)
Intermediate columns

175. Reactions at the supports of a structure can be determined by equating the algebraic sum of

  1. Horizontal forces to zero
  2. Vertical forces to zero
  3. Moment about any point to zero
  4. All the above

Correct answer: (D)
All the above

176. Shear deflection of a cantilever of length L, cross sectional area A and shear modulus G, subjected to w/m u.d.l., is

  1. (3/4) (L2w/GA)
  2. (3/2) (L3w/GA)
  3. (2/3) (L2w/GA)
  4. (3/2) (Lw/GA2)

Correct answer: (A)
(3/4) (L2w/GA)

177. Shear deflection of a cantilever of length L, cross sectional area A and shear modulus G, under a concentrated load W at its free end, is

  1. (2/3) (WL/AG)
  2. (1/3) (WL2/EIA)
  3. (3/2) (WL/AG)
  4. (3/2) (WL2/AG)

Correct answer: (C)
(3/2) (WL/AG)

178. Shear force for a cantilever carrying a uniformly distributed load over its length, is

  1. Triangle
  2. Rectangle
  3. Parabola
  4. Cubic parabola

Correct answer: (B)
Rectangle

179. Simple bending equation is

  1. M/I = R/E = F/Y
  2. I/M = E/R = Y/F
  3. M/I = E/R = F/Y
  4. M/I = R/E = Y/F

Correct answer: (C)
M/I = E/R = F/Y

180. Strain energy of a member may be equated to

  1. Average resistance × displacement
  2. ½ stress × strain × area of its cross-section
  3. ½ stress × strain × volume of the member
  4. ½ (stress)2 × volume of the member + Young's modulus E

Correct answer: (D)
½ (stress)2 × volume of the member + Young's modulus E

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