41. For concreting of heavily reinforced sections without vibration, the workability of concrete expressed as compacting
factor should be
a) 0.75-0.80
b) 0.80-0.85
c) 0.85 - 0.92
d) above 0.92
Ans: d
42. Maximum quantity of water needed per 50 kg of cement for M 15 grade of concrete is
a) 28 litres
b) 30 litres
c) 32 litres
d) 34 litres
Ans: c
43. In case of hand mixing of concrete, the extra cement to be added is
a) 5%
b) 10%
c) 15%
d) 20%
Ans: b
44. For walls, columns and vertical faces of all structural members, the form work is generally removed after
a) 24 to 48 hours
b) 3 days
c) 7 days
d) 14 days
Ans: a
45. The individual variation between test strength of sample should not be more than
a) ±5% of average
b) ± 10% of average
c) ± 15% of average
d) ±20% of average
Ans: c
46. One of the criteria for the effecvve width of flange of T-beam is bf =—+ bw +6Df 6 In above formula, l0 signifies
a) effective span of T-beam
b) distance between points of zero mo-ments in the beam
c) distance between points of maximum moments in the beam
d) clear span of the T-beam
Ans: b
47. For a cantilever of effective depth of 0.5m, the maximum span to satisfy vertical deflection limit is
a) 3.5 m
b) 4 m
c) 4.5 m
d) 5 m
Ans: a
48. For a simply supported beam of span 15m, the minimum effective depth to satisfy the vertical deflection limits should be
a) 600 mm
b) 750 mm
c) 900 mm
d) more than 1 m
Ans: b
49. For a continuous slab of 3 m x 3.5 m size, the minimum overall depth of slab to satisfy vertical deflection limits is
a) 50 mm
b) 75 mm
c) 100 mm
d) 120 mm
Ans: b
50. According to IS : 456-1978, the fiexural strength of concrete is
a) directly proportional to compressive strength
b) inversely proportional to compressive strength
c) directly proportional to square root of compressive strength
d) inversely proportional to square root of compressive strength
Ans: c
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
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factor should be
a) 0.75-0.80
b) 0.80-0.85
c) 0.85 - 0.92
d) above 0.92
Ans: d
42. Maximum quantity of water needed per 50 kg of cement for M 15 grade of concrete is
a) 28 litres
b) 30 litres
c) 32 litres
d) 34 litres
Ans: c
43. In case of hand mixing of concrete, the extra cement to be added is
a) 5%
b) 10%
c) 15%
d) 20%
Ans: b
44. For walls, columns and vertical faces of all structural members, the form work is generally removed after
a) 24 to 48 hours
b) 3 days
c) 7 days
d) 14 days
Ans: a
45. The individual variation between test strength of sample should not be more than
a) ±5% of average
b) ± 10% of average
c) ± 15% of average
d) ±20% of average
Ans: c
46. One of the criteria for the effecvve width of flange of T-beam is bf =—+ bw +6Df 6 In above formula, l0 signifies
a) effective span of T-beam
b) distance between points of zero mo-ments in the beam
c) distance between points of maximum moments in the beam
d) clear span of the T-beam
Ans: b
47. For a cantilever of effective depth of 0.5m, the maximum span to satisfy vertical deflection limit is
a) 3.5 m
b) 4 m
c) 4.5 m
d) 5 m
Ans: a
48. For a simply supported beam of span 15m, the minimum effective depth to satisfy the vertical deflection limits should be
a) 600 mm
b) 750 mm
c) 900 mm
d) more than 1 m
Ans: b
49. For a continuous slab of 3 m x 3.5 m size, the minimum overall depth of slab to satisfy vertical deflection limits is
a) 50 mm
b) 75 mm
c) 100 mm
d) 120 mm
Ans: b
50. According to IS : 456-1978, the fiexural strength of concrete is
a) directly proportional to compressive strength
b) inversely proportional to compressive strength
c) directly proportional to square root of compressive strength
d) inversely proportional to square root of compressive strength
Ans: c
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
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