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MCQ
41. Why are steel reinforcing rods used in concrete beams-
To make it carry compression
To make it carry tension
To make it carry both compression and tension
None of these
ব্যাখ্যা: Steel reinforcing rods used in concrete beam because they have good tensile strength. concrete carry only compression strength.
42. Thickness of base, in no case, should be more than-
10 cm
15 cm
20 cm
30 cm
ব্যাখ্যা: Base-এর Thickness 100-300mm-এর বেশি হবে না।
43. A flat slab is supported on-
beams
columns
beams and columns
None of these
ব্যাখ্যা: A flat slab is a two-way reinforced concrete slab that usually does not have beams and girders and the loads are transferred directly to the supporting concrete columns.
44. Cast iron is used for:
Structural work in beam
Small size tank
Columns work
Boundary walls
ব্যাখ্যা: Cast iron is used for columns and struts because the column is designed for compression stresses and cast iron is good in compression
45. What is the unit weight of brick work?
100 Ib/fr^3
120 Ib/ft^3
140 Ib/ft^3
160 Ib/ft^3
ব্যাখ্যা: The unit weight of brick work is 1920kg/m^3 or 120 lb/fr^3.
46. Minimum number of reinforcing bars required in a circular column is-
4
6
5
8
নোট: (i) Min of 6 bars in circular arrangement enclosed by spiral reinforcement. (ii) Min of 4 bars in rectangular or circular arrangement enclosed by ties reinforcement. (iii) Min of 3 bars in triangular arrangement of ties.
47. The transverse reinforcement provided at right angles to the main reinforcement in a slab-
Distributed load
Resist the temperature stress
Resist the shrinkage stress
All of the above
ব্যাখ্যা: The distribution reinforcement have termed as transvers reinforcement is provided that to resist the stresses produced by temperature changes and shrinkage of concrete in that direction.
48. What is the live load for residential building?
20 lb/ft²
30 lb/ft²
40 Ib/ft²
60 lb/ft²
ব্যাখ্যা: Building codes specify a uniform live loud of 40 pound per square foot for most residential floor designs. This load is intended to account for the large number of load that can occur in a residence.
49. The spacing of transverse reinforcement of column is decided by the following considerations-
The least lateral dimension of the column
Sixteen times the diameter of the smallest longitudinal reniforcing rod is the column
Forty-eight times the diameter of transverse reinforcement
all the above
ব্যাখ্যা: Transverse reinforcement means column stirrups. Spacing ≤16 dia of main bar. Spacing ≤48 dia of fit bar and speacing so lateral dimension of column.
50. A column is considered long if the effective length of column to its least lateral dimension is more than-
10
15
12
20
ব্যাখ্যা: Long column is considered to be long if the ratio of effective length of column to its least lateral dimension is greater than 12 and short column is considered to be short if the ratio of effective length to its least lateral dimension is less than or equal to 12.
51. In a single reinforced beam, the effective depth is measured from its compression edge to-
tensile edge
tensile reinforcement
neutral axis of the beam
longitudinal central axis
52. A pretensioned concrete beam, 100 mm wide and 300 mm deep in prestressed by straight wire. Modulus of elasticity of steel and concrete are 210 N/mm² and 35 N/mm² respectively. Find modular ratio.
14
7
6
3
53. The steel used for the manufacture of rails, is-
bessemer steel
cast steel
mild steel
stainless steel
ব্যাখ্যা: Bessemer steel was used in the United States primarily for railroad rails. During the construction of bridge should be used of bessemer steel.
54. According to the principle of buoyancy a body totally or partially immersed in a fluid will be lifted up by a force equal to-
the weight of the body
more than the weight of the body
less than the weight of the body
weight of the fluid displaced by the body
55. The minimum number of main steel bars provided in RCC.
rectangular column is 4
circular column is 8
octagonal column is 16
all the above
ব্যাখ্যা: Rectangular = 4-16mmф Circular 6-16mmф
56. The spacing of stirrups in a rectangular beam is-
kept constant throughout the beam
decrease towards the centre of the beam
increase at the ends
increase at the centre of the beam
ব্যাখ্যা: Maximum spacing of vertical stirrups in a rectangle beam is at its midspan. It's because the shear force at the midspan is very less. The spacing of vertical stirrups is minimum near the supports due to maximum shear force at the supports.
57. A Slab may be designed as one way if the ratio of its longer side to shorter side exceeds.
1.5
1.75
2.00
2.25
ব্যাখ্যা: One way slab is a slab which is supported by beams on the two opposite sides to carry the load along one direction. The ratio of longer span to shorter span is equal or greater than 2, consider as one way slab because this slab will bend in one direction.
58. Steel generally used in RCC work is-
Mild steel
Stainless steel
High carbon steel
High tension steel
ব্যাখ্যা: Mild steel is a ferrous metal made from iron and carbon. It is a low-priced material with properties that are suitable for most general engineering application. Low carbon mild steel has good magnetic properties due to its high iron content.
59. On the basis of intensity of earthquaks, Bangladesh has been divided into generalised seismic zones of
2
3
4
5
60. The live load to be considered for an accessible roof is-
Nil
75 kg/m^3
200 kg/m²
150 kg/m²
ব্যাখ্যা: The permissible live lead of roof is 150 kg/m²