51. According to IS : 456-1978, the cblumn or the strut is the member whose effective length is greater than
a) the least lateral dimension
b) 2 times the least lateral dimension
c) 3 times the least lateral dimension
d) 4 times the least lateral dimension
Ans: c
52. According to IS : 456- 1978, minimum slenderness ratio for a short column is
a) less than 12
b) less than 18
c) between 18 and 24
d) more than 24
Ans: a
53. Lap length in compression shall not be less than
a) 15 4>
b) 20 <}>
c) 24 (j)
d) 30 (j)
where (j) is diameter of bar
Ans: c
54. The minimum cover in a slab should neither be less than the diameter of bar nor less than
a) 10 mm
b) 15 mm
c) 25 mm
d) 13 mm
Ans: b
55. For a longitudinal reinforcing bar in a column, the minimum cover shall neither be less than the diameter of bar nor less than
a) 15 mm
b) 25 mm
c) 30mm
d) 40 mm
Ans: d
56. The ratio of the diameter of reinforcing bars and the slab thickness is
a) 1/4
b) 1/5
c) 1/6
d) 1/8
Ans: d
57. According to IS: 456-1978, the maximum reinforcement in a column is
a) 2 %
b) 4%
c) 6 %
d) 8 %
Ans: c
58. The percentage of reinforcement in case of slabs, when high strength deformed bars are used is not less than
a) 0.15
b) 0.12
c) 0.30
d) 1.00
Ans: b
59. Which of the following statements is incorrect ?
a) Minimum cross sectional area of longitudinal reinforcement in a column is 0.8%.
b) Spacing of longitudinal bars measured along the periphery of column should not exceed 300 mm.
c) Reinforcing bars in a column should not be less than 12 mm in diameter.
d) The number of longitudinal bars pro-vided in a circular column should not be less than four.
Ans: d
60. Which of the following statements is incorrect ?
a) Higher Vee-Bee time shows lower workability.
b) Higher slump shows higher workability.
c) Higher compacting factor shows higher workability.
d) none of the above
Ans: d
61. Minimum pitch of transverse reinforce¬ment in a column is
a) the least lateral dimension of the member
b) sixteen times the smallest diameter of longitudinal reinforcement bar to be tied
c) forty-eight times the diameter of transverse reinforcement
d) lesser of the above three values
Ans: d
62. Maximum distance between expansion joints in structures as per IS : 456 – 1978 is
a) 20 m
b) 30 m
c) 45 m
d) 60 m
Ans: c
63. A continuous beam is deemed to be a deep beam when the ratio of effective span to overall depth (1/D) is less than
a) 1.5
b) 2.0
c) 2.5
d) 3.0
Ans: c
64. Critical section for shear in case of flat slabs is at a distance of
a) effective depth of slab from periphery of column/drop panel
b) d/2 from periphery of column/capital/ drop panel
c) at the drop panel of slab
d) at the periphery of column
Ans:b
65. Minimum thickness of load bearing RCC wall should be
a) 50 mm
b) 100 mm
c) 150 mm
d) 200 mm
Ans:b
66. If the storey height is equal to length of RCC wall, the percentage increase in strength is
a) 0
b) 10
c) 20
d) 30
Ans: b
67. In reinforced concrete footing on soil, the minimum thickness at edge should not be less than
a) 100 mm
b) 150 mm
c) 200 mm
d) 250 mm
Ans:b
68. The slab is designed as one way if the ratio of long span to short span is
a) less than 1
b) between 1 and 1.5
c) between 1.5 and 2
d) greater than 2
Ans: d
69. Ratio of permissible stress in direct compression and bending compression is
a) less than 1
b) between 1 and 1.5
c) between 1.5 and 2.0
d) greater than 2
Ans: a
70. A higher modular ratio shows
a) higher compressive strength of concrete
b) lower compressive strength of concrete
c) higher tensile strength of steel
d) lower tensile strength of steel
Ans:b
71. The average permissible stress in bond for plain bars in tension is
a) increased by 10% for bars in compression
b) increased by 25% for bars in compression
c) decreased by 10% for bars in compression
d) decreased by 25% for bars in compression
Ans:b
74. In working stress design, permissible bond stress in the case of deformed bars is more than that in plain bars by
a) 10%
b) 20%
c) 30%
d) 40%
Ans: d
75. The main reason for providing number of reinforcing bars at a support in a simply supported beam is to resist in that zone
a) compressive stress
b) shear stress
c) bond stress
d) tensile stress
Ans: c