design of concrete structures Mcqs
51. The approximate value of the ratio between direct tensile strength and flexural strength is_____________?
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A. 0.75

B. 0.5

C. 1

D. 0.33

52. One of the criteria for the effecvve width of flange of T-beam is bf =+ bw +6Df 6 In above formula, l0 signifies_______________?
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A. clear span of the T-beam

B. effective span of T-beam

C. distance between points of zero moments in the beam

D. distance between points of maximum moments in the beam

53. If the depth of neutral axis for a singly reinforced rectangular section is represented by kd in working stress design, then the value of k for balanced section_______________?
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A. depends on as, only

B. depends on aCbC only

C. depends on both crst and acbc

D. is independant of both ast and acbc where d is the effective depth, ast is per-missible stress in steel in tension and ocbc is permissible stress in concrete in bending compression

54. Maximum quantity of water needed per 50 kg of cement for M 15 grade of concrete is_______________?
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A. 32 liters

B. 28 liters

C. 30 liters

D. 34 liters

55. For a continuous slab of 3 m x 3.5 m size, the minimum overall depth of slab to satisfy vertical deflection limits is__________________?
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A. 75 mm

B. 50 mm

C. 100 mm

D. 120 mm

56. The factor of safety for______________?
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A. steel is higher than that for concrete

B. steel and concrete are same

C. steel is lower than that for concrete

D. none of the above

57. The minimum cover to the ties or spirals should not be less than________________?
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A. 50mm

B. 20 mm

C. 25 mm

D. 15 mm

58. The ratio of the diameter of reinforcing bars and the slab thickness is_______________?
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A. 4-Jan

B. 1/8

C. 5-Jan

D. 6-Jan

59. Approximate value of shrinkage strain in concrete, is________________?
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A. 0.00003

B. 0.03

C. 0.0003

D. 0.003

60. The permissible diagonal tensile stress in reinforced brick work is_____________?
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A. about 1.0 N/mm2

B. 0.3 N/mm2 to 0.7 N/mm2

C. about 0.1 N/mm2

D. zero

61. The load carrying capacity of a helically reinforced column as compared to that of a tied column is about________________?
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A. 5% more

B. 5% less

C. 10% more

D. 10% less

62. The strength of concrete after one year as compared to 28 days strength is about_______________?
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A. 10 to 15% more

B. 15 to 20% more

C. 25 to 50% more

D. 20 to 25% more
63. According to IS : 456- 1978, minimum slenderness ratio for a short column is_______________?
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A. less than 18

B. between 18 and 24

C. less than 12

D. more than 24

64. For the design of retaining walls, the minimum factor of safety against overturning is taken as_____________?
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A. 3

B. 2.5

C. 2.0

D. 1.5

65. If the permissible stress in steel in tension is 140 N/mm2, then the depth of neutral axis for a singly reinforced rectangular balanced section will be___________________?
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A. 0.45 d

B. 0.35 d

C. 0.40 d

D. dependent on grade of concrete also

66. The most commonly used admixture which prolongs the setting and hardening time is_______________?
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A. gypsum

B. all of the above

C. calcium chloride

D. sodium silicate

67. For a cantilever of effective depth of 0.5m, the maximum span to satisfy vertical deflection limit is______________?
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A. 4 m

B. 4.5 m

C. 3.5 m

D. 5 m

68. The relation between modulus of rupture fcr, splitting strength fcs and direct tensile strength fcl is given by_______________?
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A. tcr rcs = tct

B. fcr<fcs

C. fc5>fcr>fC

D. fcr>fcs>fc
69. If the storey height is equal to length of RCC wall, the percentage increase in strength is_____________?
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A. 0

B. 30

C. 20

D. 10
70. In counterfort retaining walls, the main reinforcement in the stem at support is_______________?
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A. not provided

B. provided only on inner face

C. provided only on front face

D. provided both on inner and front faces

71. Workability of concrete is directly proportional to________________?
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A. all of above

B. grading of the aggregate

C. aggregate cement ratio

D. time of transit

72. Poissons ratio for concrete_______________?
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A. none of the above

B. decreases with richer mixes

C. increases with richer mixes

D. remains constant

73. If the size of panel in a flat slab is 6m x 6m, then as per Indian Standard Code, the widths of column strip and middle strip are__________________?
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A. 1.5 m and 3.0 m

B. 3.0 m and 1.5 m

C. 1.5 m and 1.5 m

D. 3.0 m and 3.0 m
74. Critical section for shear in case of flat slabs is at a distance of_______________?
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A. d/2 from periphery of column/capital/ drop panel

B. effective depth of slab from periphery of column/drop panel

C. at the drop panel of slab

D. at the periphery of column

75. According to IS : 456 -1978, the modulus of elasticity of concrete Ec (in N/mm2) can be taken as______________?
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A. Ec = where fck N/mm2 = 700 is the characteristic strength in

B. Ec = = 570

C. Ec = = 5700fck

D. Ec = = 5700
76. The relation between modulus of rupturefcr and characteristic strength of concrete fck is given by_______________?
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A. fcr=1.2Vf7

B. fcr=0.57f7

C. fcr=0.7Vf7

D. re fcr and fck are in N/mm2?

E. fcr=0.35Vf7

77. The individual variation between test strength of sample should not be more than______________?
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A. 5% of average

B. 20% of average

C. 15% of average

D. 10% of average

78. According to IS: 456-1978, the maximum reinforcement in a column is_____________?
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A. 8%

B. 6 %

C. 4%

D. 2%

79. If a beam fails in bond, then its bond strength can be increased most economi-cally by___________?
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A. increasing the depth of beam

B. using thinner bars but more in number

C. using thicker bars but less in number

D. providing vertical stirrups

80. While designing the pile as a column, the end conditions are nearly_______________?
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A. both ends hinged

B. both ends fixed

C. one end fixed and other end hinged

D. one end fixed and other end free

81. If nominal shear stress tv exceeds the design shear strength of concrete xc, the nominal shear reinforcement as per IS : 456-1978 shall be provided for carrying a shear stress equal to__________________?
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A. Tv + Tc

B. xv TC

C. xv

D. xc

82. For walls, columns and vertical faces of all structural members, the form work is generally removed after_______________?
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A. 3 days

B. 7 days

C. 14 days

D. 24 to 48 hours
83. The temperature reinforcement in the vertical slab of a T-shaped R.C. retaining wall is______________?
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A. provided more on inner face than on front face

B. provided more on front face than on inner face

C. not needed

D. provided equally on inner and front faces

84. A T-shaped retaining wall mainly conssits of_________________?
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A. one cantilever

B. four cantilevers

C. three cantilevers

D. two cantilevers

85. Half of the main steel in a simply supported slab is bent up near the support at a distance of x from the center of slab bearing where x is equal to________________?
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A. re 1 is the span

B. 10-Jan

C. 5-Jan

D. 3-Jan

E. 1/7
86. In a counterfort retaining wall, the main reinforcement in the stem at mid span is provided on_______________?
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A. front face only

B. inner face only

C. both front face and inner face

D. none of the above

87. The minimum cover in a slab should neither be less than the diameter of bar nor less than_______________?
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A. 15 mm

B. 13 mm

C. 25 mm

D. 10 mm

88. Minimum grade of concrete to be used in reinforced concrete as per IS:456-1978 is_____________?
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A. M15

B. M20

C. M 10

D. M25

89. Lap length in compression shall not be less than______________?
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A. 20

B. 15 4>

C. 30 (j)

D. 24 (j)
90. In case of hand mixing of concrete, the extra cement to be added is__________________?
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A. 10%

B. 5%

C. 15%

D. 20%

91. Modulus of rupture of concrete is a measure of_______________?
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A. direct tensile strength

B. flexural tensile strength

C. split tensile strength

D. compressive strength

92. Minimum pitch of transverse reinforcement in a column is________________?
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A. forty-eight times the diameter of transverse reinforcement

B. lesser of the above three values

C. sixteen times the smallest diameter of longitudinal reinforcement bar to be tied

D. the least lateral dimension of the member

93. Sinking of an intermediate support of a continuous beam_____________?
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A. e="color: #003f1a;">3. reduces the positive moment at center of span

B. correct answer is?

C. e="color: #003f1a;">2. increases the negative moment at support
D. e="color: #003f1a;">4. increases the positive moment at center of span
E. ="color: #003f1a;">1. reduces the negative moment at support
94. Due to shrinkage stresses, a simply supported beam having reinforcement only at bottom tends to_____________?
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A. deflect downward or upward

B. deflect upward

C. none of the above

D. deflect downward
95. The maximum value of hoop compression in a dome is given by___________________?
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A. wR/d

B. 2wR/d

C. wR/2d

D. wR / 4d

96. In the design of a front counterfort in a counterfort retaining wall, the main reinforcement is provided on_______________?
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A. ="color: #003f1a;">1. bottom face near counterfort
B. e="color: #003f1a;">2. top face near counterfort
C. e="color: #003f1a;">3. bottom face near centre of span
D. e="color: #003f1a;">4. top face near centre of span The correct answer is

E. only (1)

F. only (2)

97. Normally prestressing wires are arranged in the_______________?
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A. anywhere

B. lower part of the beam

C. center

D. upper part of the beam

98. The effect of creep on modular ratio is__________________?
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A. to keep it unchanged

B. to increase it

C. to decrease it

D. either to decrease or to increase it

99. In prestressed concrete______________?
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A. forces of tension and compression change but lever arm remains unchanged

B. forces of tension and compressions remain unchanged but lever arm changes with the moment

C. both forces of tension and compres-sion as well as lever arm change

D. both forces of tension and compres-sion as well as lever arm remain unchanged

100. During erection, the pile of length / is supported by a crane at a distance of________________?
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A. 0.7071

B. 0.207 /

C. 0.293 /

D. 0.793 /