RCC Structures Design MCQ Questions and Answers in Civil Engineering

Question. The radius of a bar bend to form a hook, should not be less than
(a) Twice the diameter
(b) Thrice the diameter
(c) Four times the diameter
(d) Five times the diameter

Answer : A

Question. Pick up the incorrect statement from the following: Tensile reinforcement bars of a rectangular beam
(a) Are curtailed if not required to resist the bending moment
(b) Are bent up at suitable places to serve as shear reinforcement
(c) Are bent down at suitable places to serve as shear reinforcement
(d) Are maintained at bottom to provide at least local bond stress

Answer : C

Question. Lapped splices in tensile reinforcement are generally not used for bars of size larger than
(a) 18 mm diameter
(b) 24 mm diameter
(c) 30 mm diameter
(d) 36 mm diameter

Answer : D

Question. An R.C.C. roof slab is designed as a two way slab if
(a) It supports live loads in both directions
(b) The ratio of spans in two directions is less than 2
(c) The slab is continuous over two supports
(d) The slab is discontinuous at edges

Answer : B

Question. If C is creep coefficient, f is original pre-stress in concrete, m is modular ratio, E is Young's modulus of steel and e is shrinkage strain, the combined effect of creep and shrinkage is:
(a) (1 - C) mf - eE
(b) (C - 1) mf + eE
(c) (C - 1) mf - eE
(d) (1 - C) mf + eE

Answer : B

Question. A ribbed slab is provided for
(a) A plain ceiling
(b) Thermal insulation
(c) Acoustic insulation
(d) All the above

Answer : D

Question. The live load to be considered for an accessible roof, is
(a) Nil
(b) 75 kg/m³
(c) 150 kg/m²
(d) 200 kg/cm²

Answer : C

Question. 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 : D

Question. As per IS : 1343, total shrinkage for a pre-tensioned beam, is
(a) 3.0 × 10^-2
(b) 3.0 × 10^-3
(c) 3.0 × 10^-5
(d) 3.5 × 10^-5

Answer : D

Question. Distribution reinforcement in a simply supported slab, is provided to distribute
(a) Load
(b) Temperature stress
(c) Shrinkage stress
(d) All the above

Answer : D

Question. The length of the lap in a compression member is kept greater than bar diameter x (Permissible stress in bar / Five times the bond stress) or
(a) 12 bar diameters
(b) 18 bar diameters
(c) 24 bar diameters
(d) 30 bar diameters

Answer : C

Question. If T and R are tread and rise respectively of a stair, then
(a) 2R + T = 60
(b) R + 2T = 60
(c) 2R + T = 30
(d) R + 2T = 30

Answer : A

Question. An R.C.C. lintel is spanning an opening of 2 m span in a brick wall. The height of the roof is 2.9 m above the floor level and that of the opening is 2.1 m above the floor level. The lintel is to be designed for self weight plus
(a) Triangular load of the wall
(b) UDL of wall
(c) UDL of wall + load from the roof
(d) Triangular load + load from the roof

Answer : C

Question. If the size of a column is reduced above the floor, the main bars of the columns, are
(a) Continued up
(b) Bent inward at the floor level
(c) Stopped just below the floor level and separate lap bars provided
(d) All the above

Answer : D

Question. If ‘W’ is weight of a retaining wall and ‘P’ is the horizontal earth pressure, the factor of safety against sliding, is
(a) 1.0
(b) 1.25
(c) 1.5
(d) 2.0

Answer : C

Question. The stem of a cantilever retaining wall which retains earth level with top is 6 m. If the angle of repose and weight of the soil per cubic metre are 30° and 2000 kg respectively, the effective width of the stem at the bottom, is
(a) 51.5
(b) 52.5
(c) 53.5
(d) 54.5

Answer : C

Question. An under-reinforced section means
(a) Steel is provided at the underside only
(b) Steel provided is insufficient
(c) Steel provided on one face only
(d) Steel will yield first

Answer : D

Question. For the design of a simply supported T-beam the ratio of the effective span to the overall depth of the beam is limited to
(a) 10
(b) 15
(c) 20
(d) 25

Answer : C

Question. The anchorage value of a hook is assumed sixteen times the diameter of the bar if the angle of the bend, is
(a) 30°
(b) 40°
(c) 45°
(d) All the above

Answer : D

Question. In the zone of R.C.C beam where shear stress is less than 5 kg/cm2, nominal reinforcement is provided at a pitch of
(a) One-half lever arm of the section
(b) One-third lever arm of the section
(c) Lever arm of the section
(d) One and half lever arm of the section

Answer : C

Question. An intermediate T-beam reinforced with two layers of tensile steel with clear cover 13 cm encased with the floor of a hall 12 meters by 7 meters, is spaced at 3 meters from adjoining beams and if the width of the beam is 20 cm, the breadth of the flange is
(a) 300 cm
(b) 233 cm
(c) 176 cm
(d) 236 cm

Answer : C

Question. An R.C.C. beam of 25 cm width and 50 cm effective depth has a clear span of 6 meters and carries a U.(d)L. of 3000 kg/m inclusive of its self weight. If the lever arm constant for the section is 0.865, the maximum intensity of shear stress, is
(a) 8.3 kg/cm²
(b) 7.6 kg/cm²
(c) 21.5 kg/cm²
(d) 11.4 kg/cm²

Answer : A

Question. The advantage of a concrete pile over a timber pile, is
(a) No decay due to termites
(b) No restriction on length
(c) Higher bearing capacity
(d) All the above

Answer : D

Question. The thickness of base slab of a retaining wall generally provided, is
(a) One half of the width of the stem at the bottom
(b) One third of the width of the stem at the bottom
(c) One fourth of the width of the steam at the bottom
(d) Width of the stem at the bottom

Answer : D

Question. The floor slab of a building is supported on reinforced cement floor beams. The ratio of the end and intermediate spans is kept
(a) 0.7
(b) 0.8
(c) 0.9
(d) 0.6

Answer : C

Question. The horizontal portion of a step in a stairs case, is known as
(a) Rise
(b) Flight
(c) Winder
(d) Tread

Answer : D

Question. A pre-stressed concrete member
(a) Is made of concrete
(b) Is made of reinforced concrete
(c) Is stressed after casting
(d) Possesses internal stresses

Answer : D

Question. A pre-cast pile generally used, is
(a) Circular
(b) Square
(c) Octagonal
(d) Square with corners chamfered

Answer : D

Question. The system in which high tensile alloy steel bars (silica manganese steel) are used as pre-stressing tendons, is known as
(a) Freyssinet system
(b) Magnel-Blaton system
(c) C.C.L. standard system
(d) Lee-McCall system

Answer : D

Question. 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 : D

Question. The maximum area of tension reinforcement in beams shall not exceed
(a) 0.15%
(b) 1.5%
(c) 4%
(d) 1%

Answer : C

Question. The maximum diameter of a bar used in a ribbed slab, is
(a) 12 mm
(b) 6 mm
(c) 20 mm
(d) 22 mm

Answer : D

Question. The percentage of minimum reinforcement of the gross sectional area in slabs, is
(a) 0.10%
(b) 0.12%
(c) 0.15%
(d) 0.18%

Answer : C

Question. 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 : D

Question. The maximum shear stress (qmax) in a rectangular beam is
(a) 1.25 times the average
(b) 1.50 times the average
(c) 1.75 times the average
(d) 2.0 times the average

Answer : B

Question. The section of a reinforced beam where most distant concrete fibre in compression and tension in steel attains permissible stresses simultaneously, is called
(a) Balanced section
(b) Economic section
(c) Critical section
(d) All the above

Answer : D

Question. If the effective length of a 32 cm diameter R.C.C column is 4.40 m, its slenderness ratio, is
(a) 40
(b) 45
(c) 50 
(d) 55

Answer : D

Question. 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) 8hlP/2

Answer : B

Question. After pre-stressing process is completed, a loss of stress is due to
(a) Shrinkage of concrete
(b) Elastic shortening of concrete
(c) Creep of concrete
(d) All the above

Answer : D

Question. The amount of reinforcement for main bars in a slab, is based upon
(a) Minimum bending moment
(b) Maximum bending moment
(c) Maximum shear force
(d) Minimum shear force

Answer : B

Question. If R and T are rise and tread of a stair spanning horizontally, the steps are supported by a wall on one side and by a stringer beam on the other side, the steps are designed as beams of width
(a) R + T
(b) T - R
(c) √R²+T²
(d) R - T

Answer : C

Question. The load stress of a section can be reduced by
(a) Decreasing the lever arm
(b) Increasing the total perimeter of bars
(c) Replacing larger bars by greater number of small bars
(d) Replacing smaller bars by greater number of greater bars

Answer : C

Question. The angle of repose of a soil is the maximum angle which the outer face of the soil mass makes
(a) With the horizontal
(b) With the vertical
(c) With the perpendicular to the inclined plane of the soil
(d) None of these

Answer : A

Question. The weight of reinforced concrete, is generally taken as
(a) 2200 kg/m³
(b) 2300 kg/m³
(c) 2400 kg/m³
(d) 2500 kg/m³

Answer : D

Question. If ‘W’ is the load on a circular slab of radius ‘R’, the maximum radial moment at the centre of the slab, is
(a) WR²/16
(b) 2WR²/16
(c) 3WR²/16
(d) 5WR²/16

Answer : C

Question. According to the steel beam theory of doubly reinforced beams
(a) Tension is resisted by tension steel
(b) Compression is resisted by compression steel
(c) Stress in tension steel equals the stress in compression steel
(d) All the above

Answer : D

Question. If a rectangular pre-stressed beam of an effective span of 5 meters and carrying a total load 3840 kg/m, is designed by the load balancing method, the central dip of the parabolic tendon should be
(a) 5 cm
(b) 10 cm
(c) 15 cm
(d) 20 cm

Answer : B

Question. The transverse reinforcements provided at right angles to the main reinforcement
(a) Distribute the load
(b) Resist the temperature stresses
(c) Resist the shrinkage stress
(d) All the above

Answer : D

Question. If ‘W’ is the uniformly distributed load on a circular slab of radius ‘R’ fixed at its ends, the maximum positive radial moment at its centre, is
(a) 3WR²/16
(b) 2WR²/16
(c) WR²/16
(d) None of these

Answer : C

Question. The Young's modulus of elasticity of steel, is
(a) 150 KN/mm2
(b) 200 KN/mm2
(c) 250 KN/mm2
(d) 275 KN/mm2

Answer : B

Question. A circular slab subjected to external loading, deflects to form a
(a) Semi-hemisphere
(b) Ellipsoid
(c) Paraboloid
(d) None of these

Answer : C

Question. If W is the load on a circular slab of radius R, the maximum circumferential moment at the centre of the slab, is
(a) WR²/16
(b) 2WR²/16
(c) 3WR²/16
(d) Zero

Answer : C

Question. The width of the flange of a T-beam, which may be considered to act effectively with the rib depends upon
(a) Breadth of the rib
(b) Overall thickness of the rib
(c) Centre to centre distance between T-beams
(d) All the above

Answer : D

Question. The reinforced concrete beam which has width 25 cm, lever arm 40 cm, shear force 6 t/cm2, safe shear stress 5 kg/cm2 and (b)M. 24 mt,
(a) Is safe in shear
(b) Is unsafe in shear
(c) Is over safe in shear
(d) Needs redesigning

Answer : B

Question. An R.C.C. column is treated as short column if its slenderness ratio is less than
(a) 30
(b) 35
(c) 40
(d) 50

Answer : D

Question. In favourable circumstances a 15 cm concrete cube after 28 days, attains a maximum crushing strength
(a) 100 kg/cm²
(b) 200 kg/cm²
(c) 300 kg/cm²
(d) 400 kg/cm²

Answer : D

Question. [A + (m - 1) A_SC] known as equivalent concrete area of R.C.C. is given by
(a) Modular ratio method
(b) Load factor method
(c) Ultimate load method
(d) None of these

Answer : A

Question. Bottom bars under the columns are extended into the interior of the footing slab to a distance greater than
(a) 42 diameters from the centre of the column
(b) 42 diameters from the inner edge of the column
(c) 42 diameters from the outer edge of the column
(d) 24 diameters from the centre of the column

Answer : C

Question. The live load to be considered for an inaccessible roof, is
(a) Nil
(b) 75 kg/m²
(c) 150 kg/cm²
(d) 200 kg/m²

Answer : B

Question. If ‘H’ is the overall height of a retaining wall retaining a surcharge, the width of the base slab usually provided, is
(a) 0.3 H
(b) 0.4 H
(c) 0.5 H
(d) 0.7 H

Answer : D

Question. The thickness of the topping of a ribbed slab, varies between
(a) 3 cm to 5 cm
(b) 5 cm to 8 cm
(c) 8 cm to 10 cm
(d) 12 cm to 15 cm

Answer : B

Question. If the maximum shear stress at the end of a simply supported R.C.C beam of 6 m effective span is 10 kg/cm², the share stirrups are provided for a distance ‘x’ from either end where, ‘x’ is
(a) 50 cm
(b) 100 cm
(c) 150 cm
(d) 200 cm

Answer : C