design of concrete structures MCQs – Page 5

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

design of concrete structures Mcqs
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 /