Reinforced Cement Concrete Structures MCQ Questions and Answers in Civil Engineering

Question. Which one of the following sections of equal cross-sectional area can resist the torsional moment a R.C.C. beam section more efficiently when working stress design is adopted ?
a) An unsymmetrical section
b) A box section
c) A solid rectangular section
d) A symmetrical

Answer : C

Question. The pitch of bars of main reinforcement in solid slab should not exceed ............ the effective depth of slab or 60 cm whichever is smaller ?
a) double
b) three times
c) five times
d) six times

Answer : B

Question. The longitudinal shearing stresses acting on the surface between the steel and concrete are called ?
a) bond stresses
b) tensile stresses
c) compressive stresses
d) none of these

Answer : A

Question. Which of the following statement is correct ?
a) The anchorage value of a hook is assumed sixteen times the diameter of the round bar if the angle of the bend is 45°
b) Steel bars are generally connected together to get greater length than the standard lengths by providing hooked splice
c) For plain mild steel reinforcing bars, when hooks are used, they should be of U-type
d) all of the above

Answer : D

Question. Which of the following statement is correct ?
a) The amount of transverse reinforcement for ordinary slab is taken as 0.15 % of gross concrete area
b) The transverse reinforcement in a simply supported slab distributes the temperature stress
c) The transverse reinforcement is placed in contact with the main reinforcement
d) none of the above

Answer : D

Question. A cantilever retaining wall should not be used for heights more than ?
a) 4 m
b) 6 m
c) 8 m
d) 10 m

Answer : B

Question. A reinforced slab, built monolithically with the supporting columns and is reinforced in two or more directions, without any provision of beams, is called a ?
a) two way slab
b) flat slab
c) continuous slab
d) circular slab

Answer : B

Question. For the purposes of the design of reinforced concrete footings, pressure distribution is assumed be ?
a) linear
b) parabolic
c) hyperbolic
d) none of these

Answer : B

Question. The maximum permissible shear stress given in IS: 456-1978 is based on ?
a) diagonal tension failure
b) diagonal compression failure
c) flexural tension failure
d) uniaxial compression

Answer : A

Question. The losses in pre-stress in pre-tensioning system are due to ?
a) friction
b) shrinkage and creep of concrete
c) elastic deformation of concrete when wires are tensioned successively
d) none of the above

Answer : B

Question. In reinforced cement concrete structures, the steel reinforcement consists of ?
a) deformed bars
b) cold twisted bars
c) mild steel and medium tensile steel bars
d) all of these

Answer : D

Question. A combined footing may be ?
a) trapezoidal
b) square
c) circle
d) either (a) or (b)

Answer : D

Question. In a reinforced concrete beam, the shear stress distribution above the neutral axis follows ?
a) straight line
b) circular curve
c) parabolic curve
d) none of these

Answer : C

Question. When there are some restrictions on the maximum value of the footing, a ................ footing should be provided even for a square column ?
a) triangular
b) trapezoidal
c) rectangular
d) circular

Answer : C

Question. The application of elastic theory to the beams is based on the assumption that ?
a) at any cross-section, plane sections before bending remain plane after bending
b) all tensile stresses are taken up by reinforcement alone and none by the concrete
c) steel reinforcement is free from initial stresses when it is embedded in concrete
d) all of the above

Answer : D

Question. When the steel bars are embedded in concrete, the concrete after setting, adheres to the surface of the bars and thus resist any force that tends to pull or push this rod. The intensity of this adhesive force is called ?
a) bond stress
b) shear stress
c) compressive stress
d) none of these

Answer : A

Question. The number of stirrups resisting shear force, in a reinforced beam, is given by ?
a) Shear force / Spacing of stirrups
b) Lever arm / Spacing of stirrups
c) Spacing of stirrups / Lever arm
d) Spacing of stirrups / Shear force

Answer : B

Question. When a circular slab simply supported at the edge is loaded with uniformly distributed load the stresses are developed in ?
a) radial direction only
b) circumferential direction only
c) both radial and circumferential direction
d) none of these

Answer : C

Question. For a longitudinal reinforcing bar in a column, the cover should not be less than ?
a) 10mm
b) 20mm
c) 30mm
d) 40mm

Answer : D

Question. The section of the beam having greater width at the top in comparison to the width below central axis is known as ?
a) critical section
b) T-section
c) L-section
d) none of these

Answer : B

Question. The maximum shear stress in a rectangular beam is ............. times of average shear stress ?
a) 1.15
b) 1.25
c) 1.50
d) 1.75

Answer : C

Question. Which of the following statement is correct ?
a) For bridge slabs, the amount of reinforcement is taken as 0.6 % of gross concrete area
b) In a circular slab, the reinforcement is provided at the concave side of the slab
c) The transverse reinforcement in a simply supported slab distributes the temperature stress
d) all of the above

Answer : C

Question. The neutral axis of an over-reinforced section falls ?
a) on the critical neutral axis of balanced section
b) below the critical neutral axis of balanced section
c) above the critical neutral axis of balanced section
d) none of the above

Answer : B

Question. According to IS: 456-1978, the thickness at the edge, in reinforced concrete be less than ......... for footings on soils ?
a) 100 mm
b) 150 mm
c) 250 mm
d) 350 mm

Answer : B

Question. In an over-reinforced section ?
a) steel reinforcement is not fully stressed to its permissible value
b) concrete is not fully stressed to its permissible value
c) either (a) and (b)
d) both (a) and (b)

Answer : A

Question. The assumed overall depth of the T-beam is taken as ............ of the span when it is simply supported at ends ?
a) 1/10 to 1/12
b) 1/12 to 1/15
c) 1/15 to 1/20
d) 1/20 to 1/25

Answer : B

Question. The ultimate strength of the steel used for pre-stressing is nearly ?
a) 250 N/mm²
b) 415 N/mm²
c) 500 N/mm²
d) 1500 N/mm²

Answer : C

Question. For M 15 concrete, the unit punching shear strength of concrete is taken as ?
a) 1 N/mm²
b) 2 N/mm²
c) 3 N/mm
d) 4 N/mm²

Answer : A

Question. For M 15 grade concrete, the section is to be redesigned if shear stress is more than ?
a) 0.5 N/mm²
b) 1 N/mm²
c) 1.5 N/mm²
d) 2 N/mm²

Answer : D

Question. In a T-beam, the vertical distance between the bottom of the flange and the centre of the tensile reinforcement is known as the ?
a) breadth of flange
b) thickness of flange
c) breadth of slab
d) depth of rib

Answer : D

Question. In a pre-stressed concrete structure ?
a) dead load of structure is reduced
b) cracking of concrete is avoided
c) the cost of supporting structure and foundation is reduced
d) all of the above

Answer : D

Question. When the footing is symmetrically loaded, the pressure beneath the footing will ?
a) be uniform
b) not be uniform
c) be zero in the centre
d) be more at the edges

Answer : B

Question. When an inclined or horizontal member is carrying mainly axial loads, it is termed as a ?
a) strut
b) column
c) tie
d) all of theset

Answer : A

Question. The maximum spacing of vertical reinforcement in R.C.C. wall should not exceed the thickness of wall ?
a) equal to
b) 1.5 times
c) 2 times
d) 3 times

Answer : D

Question. The loss of stress with time at constant strain is called ?
a) relaxation
b) creep
c) shrinkage
d) ductility

Answer : A

Question. The moment of resistance of an over-reinforced section is determined on the basis of ?
a) tenisle force developed in steel
b) compressive force developed in concrete
c) both (a) and (b)
d) none of these

Answer : D

Question. In a ribbed slab, the clear spacing between the ribs should not be more than ?”
a) 300 mm
b) 450 mm
c) 600 mm
d) 800 mm

Answer : B

Question. The pitch of transverse reinforcement should not be more than the ?
a) least lateral dimension of the column
b) sixteen times the diameter of the longitudinal reinforcing bar nearest to the compression face of the member
c) forty-eight times the diameter of the transverse reinforcement
d) minimum value of (a), (b) and (c)

Answer : D

Question. The torsion resisting capacity of a given reinforced concrete section ?
a) decreases with decrease in stirrup spacing
b) decreases with increase in longitudinal bars
c) does not depend upon stirrup and longitudinal steels
d) increases with increase in stirrup and longitudinal steels

Answer : D

Question. If the bond stress developed in a reinforced concrete beam is more than permissible value, it can be brought down by ?
a) increasing the depth of beam
b) increasing the number of bars
c) decreasing the diameter of the bars
d) all of these

Answer : D

Question. The combined footing, in the longitudinal direction, will have ?
a) sagging bending moment in the two cantilever portions
b) hogging bending moment in some length of middle portion
c) either (a) or (b)
d) both (a) and (b)

Answer : D

Question. In a singly reinforced concrete beam, as the load increases ?
a) only concrete will resist tension
b) only steel bars will resist tension
c) both concrete and steel will resist tension
d) both concrete and steel will resist compression

Answer : B

Question. As per IS: 456-1978, the permissible value of bond stress for M15 grade of concrete is ?
a) 0.5 N/mm²
b) 1 N/mm²
c) 1.5 N/mm²
d) 2 N/mm²

Answer : B

Question. For a ribbed slab, the overall depth of the slab shall not exceed ............ the width of slab ?
a) two times
b) three times
c) four times
d) five times

Answer : C

Question. In a beam section, if the steel reinforcement is of such a magnitude that the permissible stresses concrete and steel are developed simultaneously, the section is known as ?
a) balanced section
b) critical section
c) economical section
d) any one of these

Answer : D

Question. The diameter of bars for main reinforcement in slabs, may vary from ?
a) 2 to 4 mm
b) 4 to 8 mm
c) 8 to 14 mm
d) 14 to 18 mm

Answer : C

Question. The thickness of the topping of a ribbed slab is kept from ?
a) 10 to 30 mm
b) 30 to 50 mm
c) 50 to 80 mm
d) 80 to 110 mm

Answer : C

Question. The modular ratio is the ratio of ?
a) Young's modulus of steel to the Young's modulus of concrete
b) Young's modulus of concrete to the Young's modulus of steel
c) load carried by steel to the load carried by concrete
d) both a and c

Answer : D

Question. In a reinforced concrete column, the cross-sectional area of steel bar is As, and that of concrete is Ac. The equivalent area of the section in terms of concrete is equal to ?
a) Ac + mAc
b) Ac + mAs
c) As - mAc
d) Ac - mAs

Answer : B

Question. When a beam is loaded with transverse loads, the bending moment ?
a) remains constant at every section
b) varies from section to section
c) develops shear stresses in the beam
d) Both b and c

Answer : D

Question. A T-beam behaves like a rectangular beam of width equal to its flange, if neutral axis ?
a) remains outside the flange
b) remains within the flange
c) remains below the slab
d) both (a) and (b)

Answer : B

Question. The effective depth of a T-beam is the distance between the ?
a) centre of the flange and the top of the tensile reinforcement
b) top of the flange and the centre of the tensile reinforcement
c) bottom of the flange and the centre of the tensile reinforcement
d) centre of the flange and the bottom of the tensile reinforcement

Answer : B

Question. Which of the following statement is wrong ?
a) The volume of lateral reinforcement provided in reinforced piles should not be less than 0.2% of the gross volume of the pile
b) The centre to centre spacing of lateral reinforcement in reinforced piles should not exceed half the width of the pile
c) When the pile has to penetrate hard stratum, the lateral reinforcement at the top of the pie for a distance of three times the width, should be in the form of helix
d) none of the above

Answer : D

Question. The sum of tread plus twice the rise of a stair is kept as ?
a) 300 mm
b) 400 mm
c) 500 mm
d) 600 mm

Answer : D

Question. In a T-beam, the breadth of the rib is equal to the ?
a) total thickness of the slab, including cover
b) width of the portion of the beam in the compression zone
c) width of the portion of the beam in the tensile zone
d) none of the above

Answer : C

Question. Bars of tensile reinforcement of a rectangular beam ?
a) are curtailed when not required to resist the bending moment
b) are bent up at suitable places to serve as shear reinforcement
c) are maintained in the bottom to provide at least the local bond stress
d) all of the above

Answer : D

Question. The breadth of rib in a T-beam should atleast be equal to ....... the depth of rib ?
a) one-half
b) one-third
c) one-fourth
d) one-sixth

Answer : B

Question. When hooks are formed in deformed bars, the internal radius of the bend should be at least ............ times the diameter of the bar ?
a) two
b) three
c) four
d) six

Answer : B

Question. End bearing piles are used ?
a) to transfer load through water or soft soil to a suitable bearing stratum
b) to resist large horizontal or inclined forces
c) to compact loose granular soils
d) all of the above

Answer : A

Question. The factor of safety due to sliding of the retaining wall is generally taken as ?
a) 1
b) 1.5
c) 2
d) 4

Answer : B

Question. For a reinforced concrete beam section, the shape of the shear stress diagram is ?
a) parabolic over the whole section with maximum value at the neutral axis
b) parabolic above the neutral axis and rectangular below the neutral axis
c) linearly varying as the distance from the neutral axis
d) dependent on the magnitude of shear reinforcement provided

Answer : B

Question. At a certain section, in a combined footing for two columns carrying unequal loads, the shear is zero. At this section ?
a) sagging moment is zero
b) sagging moment is maximum
c) hogging moment is zero
d) nogging moment is maximum

Answer : D

Question. The precast concrete piles are generally used for a maximum design load of about ....... concept for large prestressed piles ?
a) 40 tonnes
b) 60 tonnes
c) 80 tonnes
d) 100 tonnes

Answer : C

Question. A reinforced concrete beam will crack if tensile stress set up in the concrete below the neutral axis is ?
a) less than the permissible stress
b) more than the permissible stress
c) equal to the permissible stress
d) any one of these

Answer : B

Question. The measurement of anchorage lengths of inclined bars, used to act as shear reinforcement is taken in ?
a) tension zone from the mid of the sloping portion of the bar
b) compression zone from mid-depth of the beam
c) tension zone from the mid-depth of the beam
d) compression zone from the end of the sloping portion of the bar

Answer : B

Question. The diameter of longitudinal bars in a column should not be less than ?
a) 4 mm
b) 8 mm
c) 12 mm
d) 16 mm

Answer : C

Question. When a reinforced concrete structure is loaded, the resistance first broken is ?
a) pure adhesive resistance
b) frictional resistance
c) mechanical resistance
d) none of these

Answer : A

Question. In case of two-way slab, the limiting deflection of the slab is ?
a) primarily a function of the long span
b) primarily a function of the short span
c) independent of long or short spans
d) dependent on both long and short spans

Answer : B

Question. For a balanced section, the moment of resistance obtained from compressive force will be ............... the moment of resistance obtained from the tensile force ?
a) greater than
b) less than
c) equal to
d) all of these

Answer : C

Question. While designing a reinforced concrete pole as a column, it is considered as ?
a) fixed at both ends
b) hinged at both ends
c) fixed at one end and hinged at the other end
d) none of the above

Answer : C

Question. A long column is one whose ratio of effective length to its least lateral dimension exceeds ?
a) 5
b) 10
c) 12
d) 20

Answer : C

Question. In a combined footing, the reinforcement should be placed ?
a) on the bottom face for sagging bending moment
b) on the top face for hogging bending moment
c) on the bottom face for hogging bending moment
d) both a and b

Answer : D

Question. A ribbed slab is provided where ?
a) plain ceiling is required
b) thermal insulation is required
c) acoustic insulation is required
d) all of these

Answer : D

Question. The purpose of lateral ties in short reinforced concrete columns is to ?
a) facilitate construction
b) facilitate compaction of concrete
c) avoid buckling of longitudinal bars
d) increase the load carrying capacity of the column

Answer : C

Question. Which of the following statement is correct ?
a) The strap footing does not transfer any pressure to the soil
b) A raft footing is a combined footing that covers the entire area beneath a structure
c) A pile foundation is used where the top soil is relatively weak
d) all of the above

Answer : D

Question. The hammer used in driving piles should be ?
a) drop hammer
b) diesel hammer
c) vibratory hammer
d) all of these

Answer : D

Question. The shrinkage in a concrete slab ?
a) causes shear cracks
b) causes tension cracks
c) causes compression cracks
d) does not cause any cracking

Answer : B

Question. The diameter of a bar used in ribbed slab should not be more than ?
a) 12 mm
b) 18 mm
c) 22 mm
d) 30 mm

Answer : C

Question. For an over reinforced (singly reinforced) rectangular reinforced concrete section ?
a) the lever arm will be less than that for a balanced section
b) the maximum stress developed by steel will be equal to the allowable stress in steel
c) the maximum stress developed by concrete will be equal to allowable stress in concrete
d) none of the above

Answer : C

Question. The diameter of bars used for distribution reinforcement in slabs, may vary from ?
a) 2 to 4 mm
b) 4 to 6 mm
c) 6 to 8 mm
d) 8 to 12 mm

Answer : C