Strength of Materials

101. Forces are called coplanar when all of them acting on body lie in

  1. One point
  2. One plane
  3. Different planes
  4. Perpendicular planes

Correct answer: (B)
One plane

102. Frictional force encountered after commencement of motion is called

  1. Post friction
  2. Limiting friction
  3. Kinematic friction
  4. Dynamic friction

Correct answer: (D)
Dynamic friction

103. From a circular plate of diameter 6 cm is cut out a circle whose diameter is a radius of the plate. Find the e.g. of the remainder from the center of circular plate

  1. 0.5 cm
  2. 1.0 cm
  3. 1.5 cm
  4. 2.5 cm

Correct answer: (A)
0.5 cm

104. Hooke's law states that stress and strain are

  1. Directly proportional
  2. Inversely proportional
  3. Curvilinearly related
  4. None of these

Correct answer: (A)
Directly proportional

105. If a circular beam of diameter d experiences a longitudinal strain P/E and a lateral strain 2P/mE, the volumetric strain is

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

Correct answer: (B)
(P/E) - (2P/mE)

106. If a constant section beam is subjected to a uniform bending moment throughout, its length bends to

  1. A circular arc
  2. A parabolic arc
  3. A catenary
  4. None of these

Correct answer: (A)
A circular arc

107. If a member carries a tensile force P on its area of cross-section A, the normal stress introduced on an inclined plane making an angle θ with its transverse plane, is

  1. (P/A) sin2 θ
  2. (P/A cos2 θ
  3. (P/A tan2 θ
  4. (P/2A sin2 θ

Correct answer: (B)
(P/A cos2 θ

108. If a member is subjected to a tensile force P, having its normal cross-section A, the resulting shear

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

Correct answer: (B)
(P/2A) sin θ

109. If a number of forces act simultaneously on a particle, it is possible

  1. Not a replace them by a single force
  2. To replace them by a single force
  3. To replace them by a single force through C.G.
  4. To replace them by a couple

Correct answer: (B)
To replace them by a single force

110. If a rectangular beam measuring 10 × 18 × 400 cm carries a uniformly distributed load such that the bending stress developed is 100 kg/cm2. The intensity of the load per metre length, is

  1. 240 kg
  2. 250 kg
  3. 260 kg
  4. 270 kg

Correct answer: (B)
250 kg

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