Concrete Technology and Design

121. If the slump of a concrete mix is 60 mm, its workability is

  1. Very low
  2. Low
  3. Medium
  4. High

Correct answer: (C)
Medium

122. If the storey height is equal to length of RCC wall, the percentage increase in strength is

  1. 0
  2. 10
  3. 20
  4. 30

Correct answer: (B)
10

123. If the various concrete ingredients i.e. cement, sand and aggregates are in the ratio of 1:3:6, the grade of concrete, is

  1. M 100
  2. M 150
  3. M 200
  4. M 250

Correct answer: (A)
M 100

124. If X, Y and Z are the fineness modulli of coarse, fine and combined aggregates, the percentage (P) of fine aggregates to combined aggregates, is

  1. P = [(Z - X)/(Z - Y)] × 100
  2. P = [(X - Z)/(Z - Y)] × 100
  3. P = [(X - Z)/(Z + Y)] × 100
  4. P = [(Z + X)/(Z - Y)] × 100

Correct answer: (B)
P = [(X - Z)/(Z - Y)] × 100

125. In a counterfort retaining wall, the main reinforcement in the stem at mid span is provided on

  1. Front face only
  2. Inner face only
  3. Both front face and inner face
  4. None of the above

Correct answer: (A)
Front face only

126. In a counterfort retaining wall, the main reinforcement is provided on the
(i) Bottom face in front counterfort
(ii) Inclined face in front counterfort
(iii) Bottom face in back counterfort
(iv) Inclined face in back counterfort The correct answer is

  1. (i) and (ii),
  2. (ii) and (iii)
  3. (i) and (iv)
  4. (iii) and (iv)

Correct answer: (C)
(i) and (iv)

127. In a pile of length 'l', the points of suspension from ends for lifting it are located at

  1. 0.207 l
  2. 0.25 l
  3. 0.293 l
  4. 0.333 l

Correct answer: (A)
0.207 l

128. In a ring beam subjected to uniformly distributed load
(i) Shear force at mid span is zero
(ii) Shear force at mid span is maximum
(iii) Torsion at mid span is zero
(iv) Torsion at mid span is maximum
The correct answer is

  1. (i) and (iii)
  2. (i) and (iv)
  3. (ii) and (iii)
  4. (ii) and (iv)

Correct answer: (A)
(i) and (iii)

129. In a spherical dome subjected to concentrated load at crown or uniformly distributed load, the meridional force is always

  1. Zero
  2. Tensile
  3. Compressive
  4. Tensile or compressive

Correct answer: (C)
Compressive

130. In a spherical dome the hoop stress due to a concentrated load at crown is

  1. Compressive everywhere
  2. Tensile everywhere
  3. Partly compressive and partly tensile
  4. Zero

Correct answer: (B)
Tensile everywhere

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