rcc structures design MCQs – Page 5

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

rcc structures design Mcqs
81. According to I.S. 456, 1978 the thickness of reinforced concrete footing on piles at its edges, is kept less than______________?
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A. 75 cm

B. 30 cm

C. 20 cm

D. 40 cm

82. As per I.S. 456 1978, the pH value of water shall be_______________?
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A. Equal to 6

B. Equal to 7

C. Not less than 6

D. Less than 6

83. per unit run exerted by the Total pressure on the vertical face of a retaining wall of height retained earth weighing per unit volume, is___________________?
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A. wh [(1 )/2(1 + sin )]

B. wh [(1 )/(1 + sin )]

C. wh [(1 )/(1 + sin )]

D. wh [(1 )/3(1 + sin )]

84. The anchorage value of a hook is assumed sixteen times the diameter of the bar if the angle of the bend, is___________________?
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A. All the above

B. 40

C. 30

D. 45

85. If the loading on a pre-stressed rectangular beam, is uniformly distributed, the tendon to be provided should be_______________?
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A. Straight below centroidal axis

B. Straight above centroidal axis

C. Parabolic with convexity downward

D. Parabolic with convexity upward

86. The advantage of reinforced concrete, is due to_______________?
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A. Economy because of less maintenance cost

B. Fire-resisting and durability

C. Monolithic character

D. All the above
87. Post tensioning system_______________?
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A. Is economical for large spans and is adopted now a days

B. Was widely used in earlier days

C. Is not economical and hence not generally used

D. None of these
88. The live load to be considered for an inaccessible roof, is______________?
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A. 200 kg/m2

B. 150 kg/cm 2

C. 75 kg/m2

D. Nil

89. The live load to be considered for an accessible roof, is________________?
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A. 75 kg/m3

B. 150 kg/m 2

C. Nil

D. 200 kg/cm 2

90. The length of lap in tension reinforcement should not be less than the bar diameter (actual tension / four times the permissible average bond stress) if it is more than_______________?
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A. 30 bar diameters

B. 36 bar diameters

C. 24 bar diameters

D. 18 bar diameters

91. If the effective length of a 32 cm diameter R.C.C. column is 4.40 m, its slenderness ratio, is_______________?
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A. 55

B. 40

C. 45

D. 50

92. Bottom bars under the columns are extended into the interior of the footing slab to a distance greater than____________?
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A. 24 diameters from the centre of the column

B. 42 diameters from the outer edge of the column

C. 42 diameters from the inner edge of the column

D. 42 diameters from the centre of the column

93. A part of the slab may be considered as the flange of the T-beam if__________________?
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A. All the above

B. It is built integrally with the beam

C. It is effectively bonded together with the beam

D. Flange has adequate reinforcement transverse to beam

94. A retaining wall and is the horizontal earth pressure, the factor of safety If is weight of against sliding, is_____________?
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A. 1.5

B. 1.25

C. 1

D. 2

95. For M 150 mix concrete, according to I.S. specifications, local bond stress, is_________________?
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A. 20 kg/cm2

B. 5 kg/cm2

C. 10 kg/cm 2

D. 15 kg/cm2

96. A pre-stressed concrete member__________________?
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A. Possesses internal stresses

B. Is made of reinforced concrete

C. Is made of concrete

D. Is stressed after casting

97. Pick up the incorrect statement from the following. The intensity of horizontal shear stress at the elemental part of a beam section, is directly proportional to__________________?
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A. Moment of the beam section about its neutral axis

B. Shear force

C. Distance of the C.G. of the area from its neutral axis

D. Area of the section

98. The breadth of a ribbed slab containing two bars must be between______________?
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A. 6 cm to 7.5 cm

B. 10 cm to 12 cm

C. 8 cm to 10 cm

D. 12 cm to 15 cm

99. For stairs spanning horizontally, the minimum waist provided is________________?
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A. 4 cm

B. 12 cm

C. 8 cm

D. 6 cm

100. A simply supported beam 6 m long and of effective depth 50 cm, carries a uniformly distributed load 2400 kg/m including its self weight. If the lever arm factor is 0.85 and permissible tensile stress of steel is 1400 kg/cm2, the area of steel required, is___________________?
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A. 17 cm2

B. 14 cm 2

C. 15 cm2

D. 16 cm2