1) The factor of safety for
a) Steel and concrete are same
b) Steel is lower than that for concrete
c) Steel is higher than that for concrete
d) None of the above
2) Maximum quantity of water needed per 50 kg of cement for M 15 grade of concrete is
a) 34 litres
b) 30 litres
c) 28 litres
d) 32 litres
3) The individual variation between test strength of sample should not be more than
a) + 10% of average
b) + 20% of average
c) + 5% of average
d) + 15% of average
4) According to IS: 456-1978, the flexural strength of concrete is
a) Inversely proportional to square root of compressive strength
b) Inversely proportional to compressive strength
c) directly proportional to square root of compressive strength
d) directly proportional to compressive strength
5) According to IS: 456- 1978, minimum slenderness ratio for a short column is
a) less than 12
b) less than 18
c) between 18 and 24
d) more than 24
6) Lap length in compression shall not be less than
a) 15 dia
b) 20 dia
c) 24 dia
d) 30 dia
7) According to IS: 456-1978, the maximum reinforcement in a column is
a) 2%
b) 4%
c) 6%
d) 8%
8) A higher modular ratio shows
a) lower compressive strength of concrete
b) lower tensile strength of steel
c) higher tensile strength of steel
d) higher compressive strength of concrete
9) The average permissible stress in bond for plain bars in tension is
a) decreased by 25% for bars in compression
b) decreased by 10% for bars in compression
c) increased by 10% for bars in compression
d) increased by 25% for bars in compression
10) The minimum diameter of longitudinal bars in a column is
a) 6 mm
b) 8 mm
c) 12 mm
d) 16 mm
11) Maximum percentage reinforcement in case of slabs is limited to
a) 2
b) 6
c) 8
d) 4
12) The partial safety factor for steel as per IS: 456 —1978 is taken as
a) 1.65
b) 1.35
c) 1.15
d) 1.50
13) The effect of creep on modular ratio is
a) to decrease it
b) to increase it
c) either to decrease or to increase
d) to keep it unchanged
14) The creep strains are
a) caused due to dead loads only
b) caused due to live loads only
c) caused due to both dead live loads
d) independent of loads
15) A beam curved in plan is designed for
a) bending moment and shear
b) bending moment and torsion
c) shear and torsion
d) bending moment, shear and torsion
16) High carbon content in the steel causes
a) increase in both tensile strength ductility
b) decrease in tensile strength increase in ductility
c) decrease in both tensile strength ductility
d) increase in tensile strength decrease in ductility
17) In concrete, use of angular crushed aggregate in place of natural gravel affects
a) compressive strength
b) direct tensile strength
c) flexural tensile strength
d) split tensile strength
18) Ratio of compressive strength to tensile strength of concrete
a) increase with age
b) decrease with age
c) remains constant
d) none of the above
19) According to Indian Standards, the grading of fine aggregates is divided into
a) two zones
b) three zones
c) four zones
d) five zones
20) The bond strength between steel and concrete is due to
a) friction
b) adhesion
c) both friction and adhesion
d) none of the above
21) The diameter of needle used in V- apparatus for the determination of initial setting time is prescribed as
a) 1 mm
b) 0.5 mm
c) 10 mm
d) 5 mm
22) The ultimate strength of the steel used for pre-stressing is nearly
a) 1500 N/mm2
b) 415 N/mm2
c) 560 N/mm2
d) 250 N/mm2
23) A doubly reinforced beam is considered less economical than a singly reinforced beam because
a) tensile steel required is more than that for a balanced section
b) concrete is not stressed to its full value
c) compressive steel is under stressed
d) shear reinforcement is more
24) In limit state design of reinforced concrete, deflection is computed by using
a) tangent modulus
b) initial tangent modulus
c) short and long term values of Young's Modulus
d) secant modulus
25) Drops are provided in flat slab to resist
a) bending moment
b) torsion
c) shear
d) thrust
26) In limit state approach, spacing of main reinforcement controls primarily.
a) cracking
b) collapse
c) deflection
d) durability
27) Deflection can be controlled by using the appropriate
a) aspect ratio
b) span/depth ratio
c) modular ratio
d) water/cement ratio
28) Shear span is defined as the zone where
a) shear force is constant
b) bending moment is constant
c) bending moment is zero
d) shear force is zero
29) From limiting deflection point of view, use of high strength steel in RC beam results in
a) no change in depth
b) increase in width
c) reduction in depth
d) increase in depth
30) Case of 2-way slab, the limiting deflection of the slab is
a) independent of long or short span
b) dependent on both long and short spans
c) primarily a function of the short span
d) primarily a function of the long span
31) Yield line theory results in
a) lower bound solution
b) upper bound solution
c) unique solution
d) elastic solution
32) Deep beams are designed for
a) shear force only
b) bending moment only
c) both shear force and bending moment
d) bearing
33) Loss of stress with time at constant strain in steel is called
a) creep
b) ductility
c) shrinkage
d) relaxation
34) The side face reinforcement, if required in a T-beam will be
a) 0.1% of the web area
b) 0.15% of the web area
c) 0.2% to 0.3% of the web area depending upoon the breadth of the web
d) half the longitudinal reinforcement
35) The purpose of lateral ties in short RC 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 columns
36) Shape of idealized stress-strain curve for concrete as prescribed by IS : 456—1978 is
a) rectangular
b) parabolic
c) rectangular- parabolic
d) none of the above
37) The compressive strength of c determined from 150 mm x 150 cylinders as compared to that dete from 150 mm cubes is
a) more
b) less
c) equal
d) none of the above
38) The compressive strength of concrete determined from 150 mm x 150 mm cylinder as compared to that determined 150mm X 300mm cylinders is
a) more
b) less
c) equal
d) none of the above
39) For a given degree of hydration, of increasing water-cement concrete
a) is to increase permeability
b) is to decrease permeability
c) doesnot change permeability
d) none of the above
40) For a given water-cement ratio in concrete, with passage of time, the permeability
a) increases
b) decreases
c) doesnot change
d) none of the above
41) Curing period required is minimum for the concrete using
a) low heat Portland cement
b) Portland slag cement
c) Rapid hardening cement
d) Ordinary Portland cement
42) In concrete mix design, allowance for bulking of sand is necessary in case of
a) volume batching only
b) weight batching only
c) both (a) and (b)
d) none of the above
43) Minimum water-cement ratio required for full hydration of cement is
a) 0.60
b) 0.23
c) 0.45
d) 0.36
44) For a constant water-cement ratio, decrease in aggregate-cement ratio causes
a) increase in workability
b) decrease in workability
c) no change in workability
d) none of the above
45) Soundness test of cement by Le- Chatelier’s apparatus gives unsoundness due to
a) free lime only
b) Magnesia only
c) both free lime and magnesia
d) none of the above
46) If the angularity number of an aggregate is increased, then the workability of the concrete using this aggregate will
a) increase
b) decrease
c) not change
d) none of the above
47) For a given aggregate content, increasing the water-cement ratio in concrete
a) increases shrinkage
b) decreases shrinkage
c) does not change shrinkage
d) none of the above
48) Endurance limit of mild steel is approximately equal to
a) 0.8
b) 0.7
c) 0.3
d) 0.5
49) Which of the following has high strength?
a) plain hot rolled wires
b) cold drawn wires
c) heat treated rolled wires
d) all have same tensile strength
50) In a spherical dome the hoop stress due to a concentrated load at crown is
a) compressive everywhere
b) tensile everywhere
c) partly compressive and partly tensile
d) zero
51) In a spherical dome subjected to concentrated load at crown or uniformly distributed load, the meridional force is always
a) tensile
b) zero
c) tensile or compressive
d) compressive
52) For bars in tension, a standard hook h anchorage value equivalent to a length of
a) 8 dia
b) 12 dia
c) 16 dia
d) 24 dia
53) The maximum compressive stress in concrete for design purposes is based on a partial safety factor of
a) 1.85
b) 1.50
c) 1.15
d) 2.20
54) According to Whitney’s theory, ultimate strain of concrete is assumed to be
a) 3%
b) 0.03%
c) 0.1%
d) 0.3%
55) The load factors for live load and dead load are taken respectively as
a) 1.5 and 1.5
b) 22 and 22
c) 2.2 and 1.5
d) 1.5 and 2.2
56) Which of the following R.C. retaining walls is suitable for heights beyond 6m?
a) L- shaped wall
b) T- shaped wall
c) Counterfort type
d) all of the above
57) For the design of retaining walls, the minimum factor of safety against over- turning is taken as
a) 1.5
b) 2.0
c) 2.5
d) 3.0
58) The load carrying capacity of a helically reinforced column as compared to that of a tied column is about
a) 5% less
b) 10% less
c) 10% more
d) 5% more
59) The minimum cover to the ties or span should not be less than
a) 15 mm
b) 20 mm
c) 25 mm
d) 50 mm
60) The limits of percentage p of the longitudinal reinforcement in a column given by
a) 0.8% to 6%
b) 0.8% to 8%
c) 0.8% to 4%
d) 0.15% to 2%
61) When shear stress exceeds the permissible limit in a slab, then it is reduced by
a) using high strength steel
b) using thinner bars but more in number
c) increasing the depth
d) providing shear reinforcement
62) The main reason for providing number of reinforcing bars at a support in a simply supported beam is to resist in that zone
a) shear stress
b) compressive stress
c) tensile stress
d) bond stress
63) In working stress design, permissible bond stress in the case of deformed bars is more than that in plain bars by
a) 20%
b) 30%
c) 10%
d) 40%
64) The slab is designed as one way if the ratio of long span to short span is
a) between 1 and 1.5
b) between 1.5 and 2
c) greater tnan 2
d) less than 1
65) Ratio of permissible stress in direct compression and bending compression is
a) less than 1
b) between 1.5 and 2.0
c) greater than 2
d) between 1 and 1.5
66) Minimum thickness of load bearing RCC wall should be
a) 50 mm
b) 100 mm
c) 150 mm
d) 200 mm
67) The ratio of the diameter of reinforcement bars and the slab thickness is
a) 1/4
b) 1/6
c) 1/8
d) 1/5
68) For a reinforced concrete section, shape of shear stress diagram is
a) rectangular above neutral axis and parabolic below neutral axis
b) wholly parabolic
c) wholly rectangular
d) parabolic above neutral axis rectangular below neutral axis
69) Diagonal tension in a beam
a) is maximum at neutral axis
b) decreases below the neutral axis and increases above the neutral axis
c) increases below the neutral axis and decreases above the neutral axis
d) remains same
70) If the permissible stress in steel in tension is 140 N/mm2, then the depth of neutral Axis for a singly reinforced rectangular balanced section will be
a) 0.35d
b) 0.40d
c) 0.45d
d) dependent on grade of concrete also
71) Modulus of elasticity of steel as per IS: 456-1978 shall be taken as
a) 200 KN/mm2
b) 2 x 106 N/cm2
c) 200 KN/cm2
d) 20 KN/cm2
72) For concreting of heavily reinforced sections without vibration, the workability of concrete expressed as compacting factor should be
a) 0.75 - 0.80
b) 0.80 - 0.85
c) 0.85 - 0.92
d) above 0.92
73) In case of hand mixing of concrete, the extra cement to be added is
a) 10%
b) 5%
c) 15%
d) 20%
74) For walls, columns and vertical faces of all structural members, the form work is generally removed after
a) 3 days
b) 14 days
c) 24 to 48 hours
d) 7 days
75) In a reinforced concrete retaining wall, a shear key is provided, if the
a) retaining wall is not safe against sliding
b) shear force in the toe slab is more than that in the heel slab
c) retaining wall is not safe against overturning
d) shear stress in the vertical stem is excessive
76) A reinforced cantilever beam of span 4 m, has a cross-section of 150×500 mm. If checked for lateral stability and deflection, the beam will
a) fall in lateral stability only
b) satisfy the requirements of deflection and lateral stability
c) fall in deflection only
d) fall in both deflection and lateral stability
77) The maximum spacing of vertical reinforcement in RCC wall should not exceed
a) the thickness of wall
b) 1.5 times the thickness of wall
c) 2 times the thickness of wall
d) 3 times the thickness of wall
78) In an RCC beam, side face reinforcement is provided if its depth exceeds
a) 300 mm
b) 500 mm
c) 750 mm
d) 700 mm
79) Flexural collapse in over reinforced beams is due to
a) primary compression failure
b) bond failure
c) primary tension failure
d) secondary compression failure
80) Shrinkage deflections in case of rectangular beams and slabs can be eliminated by putting
a) compression steel 25% greater than tensile steel
b) compression steel more than tensile steel
c) compression steel equal to tensile steel
d) compression steel less than tensile steel
81) In limit state design, permissible bond stress in the case of deformed bars is more
a) 40%
b) 50%
c) 25%
d) 60%
82) Pre-stressed concrete is more desirable in case of
a) cylindrical pipe subjected to internal fluid pressure
b) cylindrical pipe subject to end pressures
c) cylindrical pipe subjected to equal internal and external fluid pressures
d) cylindrical pipe subjected to external fluid pressure
83) In a doubly reinforced rectangular beam, the allowable stress in compression steel is
a) not related to the permissible concrete compression stress
b) less than the permissible stress in steel
c) more than the permissible stress in tension in steel
d) equal to the permissible stress in tension in steel
84) The diagonal tension which results ultimate failure due to development diagonal tension cracks, depends on
a) shear span
b) effective depth
c) both (a) and (b)
d) none of the above
85) For reinforced concrete exposed to sulphate attack minimum grade required is
a) M 25
b) M 10
c) M 15
d) M 20
86) minimum period stipulated for moist curing of concrete using ordinary Portland cement is
a) 3 days
b) 7 days
c) 14 days
d) 28 days
87) Addition of sugar in concrete (about 0.05% of weight of cement) results in
a) incresing the setting time by about 1 hour
b) decreasing the setting time by about 1 hour
c) increasing the setting time by about 4 hours
d) decreasing the setting time by about 4 hours
88) the limit of loss on ignition for ordinary Portland cement is
a) 5%
b) 4%
c) 6%
d) 3%
89) Maximum permissible limit of magnesia content in ordinary Portland cement is
a) 4%
b) 6%
c) 8%
d) 10%
90) Increase in fineness modulus of aggregate indicates
a) finer grading
b) coarse grading
c) gap grading
d) none of the above
91) If the contributions of tri-calcium silicate, di-calcium silicate, tri-calcium aluminate and tetra calcium alumino ferrite to the 28 days strength of hydrated ordinary Portland cement are respectively W, X, Y and Z, then
a) W>X>Y>Z
b) X>W>Y>Z
c) W>X>Z>Y
d) W>Y>X>Z
92) Impact strength of concrete is greater for
a) water stored concrete than for dry concrete
b) angular crushed aggregates
c) rounded aggregates
d) none of the above
93) With the increase in rate of loading during testing, compressive strength of concrete
a) increases
b) decreases
c) remains same
d) none of the above
94) Normally pre-stressing wires are arranged in the
a) upper part of the beam
b) lower part of the beam
c) center
d) anywhere
95) Due to shrinkage stresses, a simply supported beam having reinforcement only at bottom tends to
a) deflect downward
b) deflect upward
c) deflect downward or upward
d) none of the above
96) If a beam fails in bond, then its bond strength can be increased most economically by
a) increasing the depth of beam
b) using thicker bars but less in number
c) providing vertical stirrups
d) using thinner bars but more in number
97) If the depth of actual neutral axis in a beam is more than the depth of critical neutral axis, then the beam is called
a) balanced beam
b) under- reinforcement beam
c) over- reinforcement beam
d) none of the above
98) Minimum grade of concrete to be used in reinforced concrete as per IS : 456-1978 is
a) M 15
b) M 20
c) M 25
d) M 10
99) the column or the strut is the member whose effective length is greater than
a) 3 times the least lateral dimension
b) 2 times the least lateral dimension
c) 4 times the least lateral dimension
d) the least lateral dimension
100) For a longitudinal reinforcing bar column, the minimum cover shall be less than the diameter of bar than
a) 15 mm
b) 25 mm
c) 30 mm
d) 40 mm
