RCC Structures Design Quiz | RCC Structures Design MCQs and Answers

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Questions
81 If longitudinally spanning stairs are casted along with their landings, the maximum bending moment per metre width, is taken as
A wl²/4
B wl²/8
C wl²/10
D wl²/12

Answer: wl²/8
82 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
A 4 mm
B 5 mm
C 6 mm
D 7 mm

Answer: 7 mm
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83 On an absolutely rigid foundation base, the pressure will
A Be more at the edges of the foundation
B Be uniform
C Not be uniform
D Be zero at the centre of the foundation

Answer: Not be uniform
84 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
A cAc + m cAsc
B c(A – Asc) + m cAsc
C c[A + (m – 1)ASC]
D All the above

Answer: All the above
85 The live load to be considered for an accessible roof, is
A Nil
B 75 kg/m3
C 150 kg/m 2
D 200 kg/cm 2

Answer: 150 kg/m 2
86 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
A w1/w2 = l2/ l1
B w1/w2 = (l2/l1)²
C w1/w2 = (l2/l1)3
D w /w = (l /l )4

Answer: w /w = (l /l )4
87 According to I.S.: 456, 1978 the thickness of reinforced concrete footing on piles at its edges, is kept less than
A 5 cm
B 10 cm
C 15 cm
D 20 cm

Answer: 15 cm
88 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
A bn (fc/2) (d – n/3)
B Atft (d – n/3)
C ½ n1 (1 – n1/3) cbd²
D All the above

Answer: All the above
89 By over-reinforcing a beam, the moment of resistance can be increased not more than
A 10 %
B 15 %
C 20 %
D 25 %

Answer: 25 %
90 A part of the slab may be considered as the flange of the T-beam if
A Flange has adequate reinforcement transverse to beam
B It is built integrally with the beam
C It is effectively bonded together with the beam
D All the above

Answer: All the above
91 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
A (5/6) (r/1 + r²) M
B (5/6) (r²/1 + r²) M
C (5/6) (r²/1 + r3) M
D (5/6) (r²/1 + r4) M

Answer: (5/6) (r²/1 + r4) M
92 The steel generally used in R.C.C. work, is
A Stainless
B Mild steel
C High carbon steel
D High tension steel

Answer: Mild steel
93 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
A 200 cm
B 300 cm
C 150 cm
D 100 cm

Answer: 150 cm
94 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
A 8hp/ l
B 8hp/l²
C 8hl/p
D 8hl/p²

Answer: 8hp/l²
95 For normal cases, stiffness of a simply supported beam is satisfied if the ratio of its span to its overall depth does not exceed
A 10
B 15
C 20
D 25

Answer: 20
96 If the loading on a pre-stressed rectangular beam, is uniformly distributed, the tendon to be provided should be.
A Straight below centroidal axis
B Parabolic with convexity downward
C Parabolic with convexity upward
D Straight above centroidal axis

Answer: Parabolic with convexity downward
97 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
A D = 0.00775 aP
B D = 0.0775 aP
C D = 0.07775 aP
D D = 0.775 Pa

Answer: D = 0.00775 aP
98 If the shear stress in a R.C.C. beam is
A Equal or less than 5 kg/cm2, no shear reinforcement is provided
B Greater than 4 kg/cm2, but less than 20 kg/cm2, shear reinforcement is provided
C Greater than 20 kg/cm2, the size of the section is changed
D All the above

Answer: All the above
99 For a continuous floor slab supported on beams, the ratio of end span length and intermediate span length, is
A 0.6
B 0.7
C 0.8
D 0.9

Answer: 0.9
100 In a singly reinforced beam
A Compression is borne entirely by concrete
B Steel possesses initial stresses when embedded in concrete
C Plane sections transverse to the centre line of the beam before bending remain plane after bending
D Elastic moduli for concrete and steel have different values within the limits of deformation of the beam

Answer: Plane sections transverse to the centre line of the beam before bending remain plane after bending

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