Concrete Technology and Design

151. Maximum distance between expansion joints in structures as per IS: 456 1978 is

  1. 20 m
  2. 30 m
  3. 45 m
  4. 60 m

Correct answer: (C)
45 m

152. Maximum percentage reinforcement in case of slabs is limited to

  1. 2
  2. 4
  3. 6
  4. 8

Correct answer: (B)
4

153. Maximum quantity of water needed per 50 kg of cement for M 15 grade of concrete is

  1. 28 liters
  2. 30 liters
  3. 32 liters
  4. 34 liters

Correct answer: (C)
32 liters

154. Minimum grade of concrete to be used in reinforced concrete as per IS: 4561978 is

  1. M 15
  2. M 20
  3. M 10
  4. M 25

Correct answer: (A)
M 15

155. Minimum pitch of transverse reinforcement in a column is

  1. The least lateral dimension of the member
  2. Sixteen times the smallest diameter of longitudinal reinforcement bar to be tied
  3. Forty-eight times the diameter of transverse reinforcement
  4. Lesser of the above three values

Correct answer: (D)
Lesser of the above three values

156. Minimum thickness of load bearing RCC wall should be

  1. 50 mm
  2. 100 mm
  3. 150 mm
  4. 200 mm

Correct answer: (B)
100 mm

157. Modulus of elasticity of steel as per IS: 4561978 shall be taken as

  1. 20 kN/cm2
  2. 200 kN/cm2
  3. 200 kN/mm2
  4. 2 × 106 N/cm2

Correct answer: (C)
200 kN/mm2

158. Modulus of rupture of concrete is a measure of

  1. Flexural tensile strength
  2. Direct tensile strength
  3. Compressive strength
  4. Split tensile strength

Correct answer: (A)
Flexural tensile strength

159. Most common method of pre-stressing used for factory production is

  1. Long line method
  2. Freyssinet system
  3. Magnel-Blaton system
  4. Lee-Macall system

Correct answer: (A)
Long line method

160. Non-uniform compaction may cause the concrete

  1. Porous
  2. Non-homogeneous
  3. Reduced strength
  4. All the above

Correct answer: (D)
All the above

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