design of concrete structures MCQs – Page 4

Practise focused design of concrete structures questions with marked answers for exam preparation and subject revision.

design of concrete structures Mcqs

61. The load carrying capacity of a helically reinforced column as compared to that of a tied column is about________________?
0

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_______________?
0

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_______________?
0

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_____________?
0

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___________________?
0

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_______________?
0

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______________?
0

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_______________?
0

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_____________?
0

A. 0

B. 30

C. 20

D. 10

70. In counterfort retaining walls, the main reinforcement in the stem at support is_______________?
0

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________________?
0

A. all of above

B. grading of the aggregate

C. aggregate cement ratio

D. time of transit

72. Poissons ratio for concrete_______________?
0

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__________________?
0

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_______________?
0

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______________?
0

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_______________?
0

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______________?
0

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_____________?
0

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___________?
0

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_______________?
0

A. both ends hinged

B. both ends fixed

C. one end fixed and other end hinged

D. one end fixed and other end free

Previous Next

Showing 61 to 80 of 137 mcqs