1. An R.C.C. beam of 6 m span is 30 cm wide and has a lever arm of 55 cm. If it carries a U.D.L. of 12 t per m and allowable shear stress is 5 kg/cm2, thebeam
Correct : D. Needsrevision of section
2. According to I.S. : 456, slabs which span in two directions with corners held down, are assumed to be divided in each direction into middle strips and edge strips such that the width of the middle strip, is
Correct : C. Three-fourth of the width of the slab
3. The load stress of a section can be reduced by
Correct : C. Replacing larger bars by greater number of smallbars
4. The diameter of the column head support a flat slab, is generally kept
Correct : A. 0.25 times the span length
5. If is the uniformly distributed load on a circular slab of radius fixed at its ends, the maximum positive radial moment at its centre, is
Correct : C. WR²/16
6. The maximum ratio of span to depth of a slab simply supported and spanning in one direction, is
Correct : C. 30
7. If the width of the foundation for two equal columns is restricted, the shape of the footing generally adopted, is
Correct : B. Rectangular
8. The floor slab of a building is supported on reinforced cement floor beams. The ratio of the end and intermediate spans is kept
Correct : C. 0.9
9. Pick up the correct statement from the following:
Correct : D. All the above
10. In case the factor of safety against sliding is less than 1.5, a portion of slab is constructed downwards at the end of the heel slab, which is known as
Correct : D. All the above
11. Lapped splices in tensile reinforcement are generally not used for bars of size larger than
Correct : D. 36 mmdiameter
12. Minimum spacing between horizontal parallel reinforcement of the same size should not be less than
Correct : A. Onediameter
13. A very comfortable type of stairs is
Correct : D. Open newel
14. Columns may be made of plain concrete if their unsupported lengths do not exceed their least lateral dimension
Correct : C. Four times
15. The width of the flange of a L-beam, should be less than
Correct : D. Least of theabove
16. A pre-stressed concrete member is preferred because
Correct : D. All the above
17. If the ratio of the span to the overall depth does not exceed 10, the stiffness of the
beam will ordinarily be satisfactory in case of a
Correct : C. Cantilever beam
18. A pile of length carrying a uniformlydistributed load per metre length is suspended at two points, the maximum, B.M. at the centre of the pile or at the points of suspension, is
Correct : C. WL²/47
19. If is the net upward pressure on a square footing of side for a square column of side , the maximum bending moment is given by
Correct : C. B.M = pb (b -a)²/8
20. To ensure uniform pressure distribution, the thickness of the foundation, is
Correct : C. Decreased gradually towards the edge
21. longitudinal bars and lateral stirrups, is
Correct : C. Stress in concrete × area of concrete + Stress in steel × area of steel
22. If p1 and p2 are mutually perpendicular principal stresses acting on a soil mass, the normal stress to the principal plane carrying the principal stress p1, is:
Correct : C. [(p p p - p cos 2
23. The maximum permissible size of aggregates to be used in casting the ribs of a slab, is
Correct : C. 10 mm
24. Pick up the incorrect statement from the following: Tensile reinforcement bars of a rectangular beam
Correct : C. Are bent down at suitable places to serve asshear reinforcement
25. Steel bars are generally connected together to get greater length than the standard
length by providing
Correct : D. All the above
26. The minimum thickness of the cover at the end of a reinforcing bar should not be less than twice the diameter of the bar subject to a minimum of
Correct : D. 25 mm
27. Top bars are extended to the projecting parts of the combined footing of two columns Ldistance apart for a distance of
Correct : B. 0.1 L from the centre edge of column
28. For M 150 grade concrete (1:2:4) the moment of resistance factor is
Correct : B. 8.50
29. is the pre-stressed force applied to tendon of a rectangular pre-stressed beam whose area of cross section is and sectional modulus is. The minimum stress on the beam subjected to a maximum bending moment is
Correct : C. f = (P/A) - (M/Z)
30. If C is creep coefficient, f is original pre-stress in concrete, m is modular ratio, E is Young's modulus of steel and e is shrinkage strain, the combined effect of creep and shrinkage is:
Correct : B. (C - 1)mf + eE
31. In a pre-stressed member it is advisable to use
Correct : D. High strength concrete and high tensile steel
32. An R.C.C. lintel is spanning an opening of 2 m span in a brick wall. The height of the roof is 2.9 m above the floor level and that of the opening is 2.1 m above the floor level. The lintel is to be designed for self weight plus
Correct : C. UDL of wall + load from the roof
33. The minimum clear cover for R.C.C. columns shall be
Correct : C. Greater of 25 mm or diameter
34. The minimum thickness of a flat slab is taken
Correct : D. All the above
35. The design of heel slab of a retaining wall is based on the maximum bending moment due to:
Correct : D. All the above
36. An R.C.C beam of 25 cm width has a clear span of 5 metres and carries a U.D.L. of 2000kg/m inclusive of its self weight. If the lever arm of the section is 45 cm., the beam is
Correct : A. Safe in shear
37. The neutral axis of a T-beam exists
Correct : D. All the above
38. A pre-cast pile generally used, is
Correct : D. Square with corners chamfered
39. The spacing of transverse reinforcement of column is decided by the following consideration.
Correct : D. All the above
40. The self-weight of the footing, is
Correct : A. Not considered for calculating the upward pressure onfooting
41. Pick up the incorrect statement from the following:
Correct : D. None of these
42. If the bearing capacity of soil is 10 tonnes/cm2 and the projection of plain concrete footing from walls, is a cm, the depth D of footing is
Correct : B. D = 0.775 a
43. After pre-stressing process is completed, a loss of stress is due to
Correct : D. All the above
44. In a simply supported slab, alternate bars are curtailed at
Correct : D. 1/7th of thespan
45. If R and T are rise and tread of a stair spanning horizontally, the steps are supported by a wall on one side and by a stringer beam on the other side, the steps are designed as beams of width
Correct : C. 2 +T2)
46. If p1 and P2 are effective lateral loadings at the bottom and top exerted by a level earth subjected to a super-load on the vertical face of height h of a retaining wall, the horizontal pressure p per unit length of the wall, is
Correct : C. [( + )/2] h
47. In the zone of R.C.C. beam where shear stress is less than 5 kg/cm2 , nominal reinforcement is provided at a pitch of
Correct : C. Lever arm of the section
48. The transverse reinforcements provided at right angles to the main reinforcement
Correct : D. All the above
49. Long and short spans of a two way slab are ly and lx and load on the slab acting on strips parallel to lx and ly be wx and wy respectively. According to Rankine Grashoff theory
Correct : C. (wx/wy) = (ly/lx)4
50. The pitch of the main bars in a simply supported slab, should not exceed its effective depth by
Correct : D. Six times
51. High strength concrete is used in pre-stressed member
Correct : D. All the above
52. If is the load on a circular slab of radius , the maximum radial moment at the centre of the slab, is
Correct : C. 3WR²/16
53. If A is the area of the foundation of a retaining wall carrying a load W and retaining earth of weight w per unit volume, the minimum depth (h) of the foundation from the free surface of the earth, is
Correct : C. h = (W/Aw) [(1 - )/(1 + sin )]²
54. If the permissible compressive and tensile stresses in a singly reinforced beam are 50 kg/cm2 and 1400 kg/cm2 respectively and the modular ratio is 18, the percentage area At of the steel required for an economic section, is
Correct : C. 0.696 %
55. The modular ratio m of a concrete whose permissible compressive stress is C, may
be obtained from the equation.
Correct : C. m = 2800/3C
56. Enlarged head of a supporting column of a flat slab is technically known as
Correct : C. Capital
57. Thickened part of a flat slab over its supporting column, is technically known as
Correct : A. Drop panel
58. If is the sectional area of a pre-stressed rectangular beam provided with a tendon pre-stressed by a force through its centroidal longitudinal axis, the compressive stress in concrete, is
Correct : A. P/A
59. Side face reinforcement shall be provided in the beam when depth of the web in a
beam exceeds
Correct : B. 75 cm
60. A pre-stressed rectangular beam which carries two concentrated loads W at L/3 from either end, is provided with a bent tendon with tension P such that central one-third portion of the tendon remains parallel to the longitudinal axis, the maximum dip his
Correct : C. WL/3P
61. The minimum head room over a stair must be
Correct : C. 210 cm
62. If q is the punching shear resistance per unit area a, is the side of a square footing for a column of side b, carrying a weight W including the weight of the footing, the depth
(D) of the footing from punching shear consideration, is
Correct : B. D = W (a² -b²)/4a²bq
63. For initial estimate for a beam design, the width is assumed
Correct : D. 1/30th ofspan
64. If the length of a combined footing for two columns l metres apart is L and the projection on the left side of the exterior column is x, then the projection y on the right side of the exterior column, in order to have a uniformly distributed load, is (where is the distance of centre of gravity of column loads).
Correct : D. y = L/2 - (l - )
65. Total pressure on the vertical face of a retaining wall of height h acts parallel to free surface and from the base at a distance of
Correct : B. h/3
66. If the tendon is placed at an eccentricity e below the centroidal axis of the longitudinal axis of a rectangular beam (sectional modulus Z and stressed load P in tendon) the stress at the extreme top edge
Correct : C. Is decreased by Pe/Z
67. The Young's modulus of elasticity of steel, is
Correct : D. 275 KN/mm2
68. Design of a two way slab simply supported on edges and having no provision to prevent the corners from lifting, is made by
Correct : C. Rankine Grashoff formula
69. Spacing of stirrups in a rectangular beam, is
Correct : D. Increased at the centre of the beam
70. As per IS : 456, the reinforcement in a column should not be less than
Correct : D. 0.8% and not more than 8% of cross-sectional area
71. The allowable tensile stress in mild steel stirrups, reinforced cement concrete, is
Correct : A. 1400 kg/cm2
72. Bottom bars under the columns are extended into the interior of the footing slab to a distance greater than
Correct : C. 42 diametersfrom the outer edge ofthe column
73. Pick up the assumption for the design of a pre-stressed concrete member from the following:
Correct : D. All the above
74. The advantage of reinforced concrete, is due to
Correct : D. All the above
75. An R.C.C. column is treated as short column if its slenderness ratio is less than
Correct : D. 50
76. The zone in which transverse bending is likely to occur may be obtained by drawing a
line from the
Correct : B. 45°
77. The thickness of the topping of a ribbed slab, varies between
Correct : B. 5 cm to 8 cm
78. If the length of an intermediate span of a continuous slab is 5m, the length of the end
span is kept
Correct : A. 4.5 m
79. If L is the effective span of a R.C.C. beam which is subjected to maximum shear qmax at the ends, the distance from either end over which stirrups for the shear, are provided, is
Correct : C. (L/2) (1 - 5/qmax)
80. The angle of internal friction of soil mass is the angle whose
Correct : A. Tangent is equal to the rate of the maximum resistance to sliding on any internal inclined plane to the normal pressure acting on theplane
81. The maximum ratio of span to depth of a slab simply supported and spanning in two
directions, is
Correct : C. 35
82. If T and R are the tread and rise of a stair which carries a load w per square metre on slope, the corresponding load per square metre of the horizontal area, is
Correct : B. w (R² + T²)/T
83. If the loading on a pre-stressed rectangular beam, is uniformly distributed, the tendon
to be provided should be.
Correct : B. Parabolic with convexity downward
84. For normal cases, stiffness of a simply supported beam is satisfied if the ratio of its
span to its overall depth does not exceed
Correct : C. 20
85. If the maximum dip of a parabolic tendon carrying tension P is h and the effective length of the pre-stressed beam is L, the upward uniform pressure will be
Correct : B. 8hp/l²
86. If depth of slab is 10 cm, width of web 30 cm, depth of web 50 cm, centre to centre distance of beams 3 m, effective span of beams 6 m, the effective flange width of the beam, is
Correct : C. 150 cm
87. The steel generally used in R.C.C. work, is
Correct : B. Mild steel
88. If the ratio of long and short spans of a two way slab with corners held down is r, the actual reduction of B.M. is given by
Correct : D. (5/6) (r²/1 + r4) M
89. A part of the slab may be considered as the flange of the T-beam if
Correct : D. All the above
90. By over-reinforcing a beam, the moment of resistance can be increased not more than
Correct : D. 25%
91. Total pressure on the vertical face of a retaining wall of height per unit run exerted by the retained earth weighing per unit volume, is
Correct : C. wh² [(1 - )/2(1 + sin )]
92. A singly reinforced beam has breadth b, effective depth d, depth of neutral axis n and critical neutral axis n1. If fc and ft are permissible compressive and tensile stresses, the moment to resistance of the beam, is
Correct : D. All the above
93. According to I.S.: 456, 1978 the thickness of reinforced concrete footing on piles at its edges, is kept less than
Correct : C. 15 cm
94. If l1 and l2 are the lengths of long and short spans of a two way slab simply supported on four edges and carrying a load w per unit area, the ratio of the loads split into w1 and w2acting on strips parallel to l2 and l1 is
Correct : D. w1/w2 = (l2/l1)4
95. The live load to be considered for an accessible roof, is
Correct : C. 150 kg/m2
96. If Ac, Asc and A are areas of concrete, longitudinal steel and section of a R.C.C. column and m and c are the modular ratio and maximum stress in the configuration of concrete, the strength of column is
Correct : D. All the above
97. On an absolutely rigid foundation base, the pressure will
Correct : C. Not be uniform
98. The diameter of transverse reinforcement of columns should be equal to one-fourth of the diameter of the main steel rods but not less than
Correct : D. 7 mm
99. If longitudinally spanning stairs are casted along with their landings, the maximum bending moment per metre width, is taken as
Correct : B. wl²/8
100. If P kg/m2 is the upward pressure on the slab of a plain concrete footing whose projection on either side of the wall is a cm, the depth of foundation D is given by