Civil Engineering : RCC Structures Design MCQs with Answers

1 .
If T and R are tread and rise respectively of a stair, then
A)  2R + T = 60
B)  R + 2T= 30
C)  R + 2T = 60
D)  2R + T = 30

Correct Answer :   2R + T = 60

2 .
In a prestressed beam carrying an external load W with a bent tendon is having angle of inclination θ and prestressed load P. The net downward load at the centre is________.
A)  W - P sin θ
B)  W - P cos θ
C)  W - 2P cos θ
D)  W - 2P sin θ

Correct Answer :   W - 2P sin θ

3 .
If permissible working stresses in steel and concrete are respectively 1400 kg/cm² and 80 kg/cm² and modular ratio is 18, in a beam reinforced in tension side and of width 30 cm and having effective depth 46 cm, the lever arms of the section, is
A)  37 cm
A)  
B)  38 cm
B)  
C)  39 cm
C)  
D)  40 cm
D)  

Correct Answer :   40 cm

4 .
Design of R.C.C. cantilever beams, is based on the resultant force at
A)  free end
B)  mid span
C)  fixed end
D)  mid span and fixed support

Correct Answer :   fixed end

5 .
If the length of a wall on either side of a lintel opening is at least half of its effective span L, the load W carried by the lintel is equivalent to the weight of brickwork contained in an equilateral triangle, producing a maximum bending moment
A)  WL / 8
A)  
B)  WL / 6
B)  
C)  WL / 4
C)  
D)  WL / 2
D)  

Correct Answer :   WL / 6

6 .
An under-reinforced section means
A)  Steel provided is insufficient
B)  Steel will yield first
C)  Steel provided on one face only
D)  Steel is provided at the under side only

Correct Answer :   Steel will yield first

7 .
The spacing of transverse reinforcement of column is decided by the following consideration.
A)  The least lateral dimension of the column
B)  Forty-eight times the diameter of transverse reinforcement
C)  Sixteen times the diameter of the smallest longitudinal reinforcing rods in the column
D)  All of the above

Correct Answer :   All of the above

8 .
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)  7 mm
B)  6 mm
C)  5 mm
D)  4 mm

Correct Answer :   7 mm

9 .
A T-beam behaves as a rectangular beam of a width equal to its flange if its neutral axis
A)  remains within the flange
B)  remains below the slab
C)  coincides the geometrical centre of the beam
D)  None of the above

Correct Answer :   remains within the flange

10 .
The weight of a foundation is assumed as
A)  5% of wall weight
B)  7% of wall weight
C)  10% of wall weight
D)  12% of wall weight

Correct Answer :   10% of wall weight

11 .
A ribbed slab is provided for
A)  a plain ceiling
B)  thermal insulation
C)  acoustic insulation
D)  All of the above

Correct Answer :   All of the above

12 .
For a number of columns constructed in a rcjw, the type of foundation provided, is
A)  raft
B)  strip
C)  strap
D)  footing

Correct Answer :   strip

13 .
After prestressing process is completed, a loss of stress is due to
A)  creep of steel
B)  creep of concrete
C)  shrinkage of concrete
D)  All of the above

Correct Answer :   All of the above

14 .
The minimum head room over a stair must be
A)  200 cm
B)  205 cm
C)  210 cm
D)  230 cm

Correct Answer :   210 cm

15 .
In case the factor of safety against sliding is less than 1.5, a portion of slab is constructed downwards at the end of the heel slab, which is known as
A)  a rib
B)  a key
C)  a cut-off wall
D)  All of the above

Correct Answer :   All of the above

16 .
The diameter of the column head support a flat slab, is generally kept
A)  0.25 times the span length
B)  0.25 times the diameter of the column
C)  4.0 cm larger than the diameter of the column
D)  5.0 cm larger than the diameter of the column

Correct Answer :   0.25 times the span length

17 .
The steel generally used in R.C.C. work, is
A)  stainless
B)  mildsteel
C)  high carbon steel
D)  high tension steel

Correct Answer :   mildsteel

18 .
Pick up the correct statement from the following :
A)  Lateral reinforcement prevents the shearing of concrete on diagonal plane
A)  
B)  Lateral reinforcement stops breaking away of concrete cover, due to buckling
B)  
C)  Lateral reinforcement in R.C.C. columns, is kept not less than 5 mm diameter
C)  
D)  All of the above
D)  

Correct Answer :   All of the above

19 .
The allowable tensile stress in mild steel stirrups, reinforced cement concrete, is
A)  190 kg/cm²
B)  230 kg/cm²
C)  260 kg/cm²
D)  1400 kg/cm²

Correct Answer :   1400 kg/cm²

20 .
If A is the sectional area of a prestressed rectangular beam provided with a tendon prestressed by a force P through its centroidal longitudinal axis, the compressive stress in concrete, is
A)  A / P
A)  
B)  P / A
B)  
C)  P / 2A
C)  
D)  2A / P
D)  

Correct Answer :   P / A

21 .
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

Correct Answer :   15 cm

22 .
The effective width of a column strip of a flat slab, is
A)  radius of the column
B)  half the width of the panel
C)  diameter of the column
D)  one-fourth the width of the panel

Correct Answer :   half the width of the panel

23 .
High strength concrete is used in prestressed member____
A)  to provide high bond stresses
B)  to ovecome bursting stresses at the ends
C)  to overcome high bearing stresses developed at the ends
D)  All of the above

Correct Answer :   All of the above

24 .
The transverse reinforcements provided at right angles to the main reinforcement
A)  distribute the load
B)  resist the shrinkage stress
C)  resist the temperature stresses
D)  All of the above

Correct Answer :   All of the above

25 .
The amount of reinformcement for main bars in a slab, is based upon
A)  maximum bending moment
B)  minimum shear force
C)  maximum shear force
D)  minimum bending moment

Correct Answer :   maximum bending moment

26 .
If the effective length of a 32 cm diameter R.C.C. column is 4.40 m, its slenderness ratio, is
A)  45
B)  50
C)  55
D)  60

Correct Answer :   55

27 .
In testing a pile by load test, pile platform is loaded with one and half times the design load and a maximum settlement is noted. The load is gradually removed and the consequent rebound is measured. For a safe pile, the net settlement (i.e. total settlement minus rebound) per tonne of test load should not exceed
A)  30 mm
A)  
B)  25 mm
B)  
C)  20 mm
C)  
D)  15 mm
D)  

Correct Answer :   25 mm

28 .
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 20 kg/cm², the size of the section is changed
C)  greater than 4 kg/cm², but less than 20 kg/cm², shear reinforcement is provided
D)  All of the above

Correct Answer :   All of the above

29 .
On piles, the drop must be at least
A)  100 cm
B)  120 cm
C)  140 cm
D)  150 cm

Correct Answer :   120 cm

30 .
The live load to be considered for an accessible roof, is
A)  75 kg/m³
B)  150 kg/m²
C)  200 kg/cm²
D)  Nil

Correct Answer :   150 kg/m²

31 .
The percentage of minimum reinforcement of the gross sectional area in slabs, is
A)  0.15%
B)  0.18%
C)  0.20%
D)  None of the above

Correct Answer :   0.15%

32 .
A continuous beam shall be deemed to be a deep beam if the ratio of effective span to overall depth, is
A)  2.0
B)  2.5
C)  less than 2
D)  less than 2.5

Correct Answer :   less than 2.5

33 .
To have pressure wholly compressive under the base of a retaining wall of width b, the resultant of the weight of the wall and the pressure exerted by the retained, earth should have eccentricity not more than
A)  b / 6
A)  
B)  b / 5
B)  
C)  b / 4
C)  
D)  b / 3
D)  

Correct Answer :   b / 6

34 .
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 of the above

Correct Answer :   All of the above

35 .
Design of a two way slab simply supported on edges and having no provision to prevent the corners from lifting, is made by
A)  Marcus formula
B)  Rankine formula
C)  Rankine Grashoff formula
D)  Rankine-Marcus formula

Correct Answer :   Rankine Grashoff formula

36 .
Design of R.C.C. simply supported beams carrying U.D.L. is based on the resultant B.M. at
A)  supports
B)  mid span
C)  quarter span
D)  every section

Correct Answer :   mid span

37 .
A foundation rests on
A)  subgrade
B)  foundation soil
C)  Both (A) and (B)
D)  base of the foundation

Correct Answer :   Both (A) and (B)

38 .
For initial estimate for a beam design, the width is assumed
A)  1/30th of span
B)  1/25th of span
C)  1/20th of span
D)  1/15th of span

Correct Answer :   1/30th of span

39 .
A foundation is called shallow if its depth, is
A)  half of its width
B)  equal to its width
C)  one-fourth of its width
D)  three-fourth of its width

Correct Answer :   equal to its width

40 .
A circular slab subjected to external loading, deflects to form a
A)  ellipsoid
B)  semi-hemisphere
C)  parabolloid
D)  None of the above

Correct Answer :   parabolloid

41 .
An R.C.C beam of 25 cm width has a clear span of 5 metres and carries a U.D.L. of 2000 kg/m inclusive of its self weight. If the lever arm of the section is 45 cm., the beam is
A)  safe in shear
B)  is safe with stirrups
C)  needs revision of the section
D)  is safe with stirrups and inclined members

Correct Answer :   safe in shear

42 .
In a doubly-reinforced beam if c and t are stresses in concrete and tension reinforcement, d is the effective depth and n is depth of critical neutral axis n, the following relationship holds good
A)  mc/t = n/d-n
A)  
B)  m+c/t = n/d+n
B)  
C)  t+c/m = d+n/n
C)  
D)  m/t+c = n/d-n
D)  

Correct Answer :   mc / t = n / d-n

43 .
The system in which high tensile alloy steel bars (silica manganese steel) are used as prestressing tendons, is known as
A)  Freyssinet system
B)  Magnel-Blaton system
C)  Lee-McCall system
D)  C.C.L. standard system

Correct Answer :   Lee-McCall system

44 .
The minimum clear cover for R.C.C. columns shall be
A)  smaller of 40 mm or diameter
B)  greater of 40 mm or diameter
C)  smaller of 25 mm or diameter
D)  greater of 25 mm or diameter

Correct Answer :   greater of 25 mm or diameter

45 .
If the loading on a prestressed rectangular beam, is uniformly distributed, the tendon to be provided should be
A)  straight above centroidal axis
B)  straight below centroidal axis
C)  parabolic with convexity upward
D)  parabolic with convexity downward

Correct Answer :   parabolic with convexity downward

46 .
In a combined footing if shear stress does not exceed 5 kg/cm², the nominal stirrups provided are
A)  6 legged
B)  8 legged
C)  10 legged
D)  12 legged

Correct Answer :   8 legged

47 .
A flat slab is supported
A)  on beams
B)  on columns
C)  on beams and columns
D)  on columns monolithicaily built with slab

Correct Answer :   on columns monolithicaily built with slab

48 .
If diameter of a reinforcement bar is d, the anchorge value of the hook is
A)  16d
B)  12d
C)  8d
D)  4d

Correct Answer :   16d

49 .
Minimum spacing between horizontal parallel reinforcement of different sizes, should not be less than
A)  one diameter of thinner bar
B)  one diameter of thicker bar
C)  twice the diameter of thinner bar
D)  sum of the diameters of ihinner and thicker bars

Correct Answer :   one diameter of thicker bar

50 .
The maximum shear stress (qmax) in a rectangular beam is
A)  2.5 times the average
A)  
B)  1.75 times the average
B)  
C)  1.50 times the average
C)  
D)  1.25 times the average
D)  

Correct Answer :   1.50 times the average

51 .
For stairs spanning horizontally, the minimum waist provided is
A)  8 cm
B)  10 cm
C)  12 cm
D)  None of the above

Correct Answer :   12 cm

52 .
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
A)  
B)  52.5
B)  
C)  54.5
C)  
D)  53.5
D)  

Correct Answer :   53.5

53 .
If the permissible compressive stress for a concrete in bending is C kg/m², the modular ratio is
A)  2800/C²
B)  2800/3C
C)  2800/C
D)  2300/2C

Correct Answer :   2800/3C

54 .
A raft foundation is provided if its area exceeds the plan area of the building by
A)  20%
B)  30%
C)  40%
D)  50%

Correct Answer :   50%

55 .
If H is the overall height of a retaining wall retaining a surcharge, the width of the base slab usually provided, is
A)  0.7 H
B)  0.6 H
C)  0.5 H
D)  0.4 H

Correct Answer :   0.7 H

56 .
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)  300 cm
B)  200 cm
C)  150 cm
D)  100 cm

Correct Answer :   150 cm

57 .
Total pressure on the vertical face of a retaining wall of height h acts parallel to free surface and from the base at a distance of
A)  h/2
B)  h/3
C)  h/4
D)  2h/3

Correct Answer :   h/3

58 .

If the permissible compressive and tensile stresses in a singly reinforced beam are 50 kg/cm² and 1400 kg/cm² respectively and the modular ratio is 18, the percentage area At of the steel required for an economic section, is
A)  0.796%
A)  
B)  0.696%
B)  
C)  0.596%
C)  
D)  0.496%
D)  

Correct Answer :   0.696%

59 .
The live load to be considered for an inaccessible roof, is
A)  75 kg/m²
B)  150 kg/cm²
C)  200 kg/m²
D)  Nil

Correct Answer :   75 kg/m²

60 .
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)  10 cm
A)  
B)  50 cm
B)  
C)  100 cm
C)  
D)  150 cm
D)  

Correct Answer :   150 cm

61 .
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

Correct Answer :   twice the diameter

62 .
In a simply supported slab the minimum spacing of distribution reinforcement, should be four times the effective thickness of the slab or
A)  30 cm
B)  40 cm
C)  50 cm
D)  60 cm

Correct Answer :   60 cm

63 .
A reinforced concrete cantilever beam is 3.6 m long, 25 cm wide and has its lever arm 40 cm. It carries a load of 1200 kg at its free end and vertical stirrups can carry 1800 kg. Assuming concrete to carry one-third of the diagonal tension and ignoring the weight of the beam, the number of shear stirrups required, is
A)  30
A)  
B)  35
B)  
C)  40
C)  
D)  45
D)  

Correct Answer :   40

64 .
As the percentage of steel increases
A)  depth of neutral axis decreases
B)  depth of neutral axis increases
C)  lever arm decreases
D)  lever arm increases

Correct Answer :   depth of neutral axis increases

65 .
If W is weight of a retaining wall and P is the horizontal earth pressure, the factor of safety against sliding, is
A)  1.25
B)  1.5
C)  2.0
D)  2.5

Correct Answer :   1.5

66 .
An intermediate T-beam reinforced with two layers of tensile steel with clear cover 13 cm encasted with the floor of a hall 12 metres by 7 metres, is spaced at 3 metres from adjoining beams and if the width of the beam is 20 cm, the breadth of the flange is
A)  176 cm
A)  
B)  233 cm
B)  
C)  236 cm
C)  
D)  300 cm
D)  

Correct Answer :   176 cm

67 .
Pick up the assumption for the design of a prestressed concrete member from the following :
A)  A transverse plane section remains a plane after bending
B)  Variation of stress in reinforcement due to changes in external loading is negligible
C)  During deformation limits, Hook's law is equally applicable to concrete as well as to steel
D)  All of the above

Correct Answer :   All of the above

68 .
If the diameter of the main reinforcement in a slab is 16 mm, the concrete cover to main bars is
A)  13 mm
B)  14 mm
C)  15 mm
D)  16 mm

Correct Answer :   16 mm

69 .
Side face reinforcement shall be provided in the beam when depth of the web in a beam exceeds
A)  75 cm
B)  100 cm
C)  120 cm
D)  145 cm

Correct Answer :   75 cm

70 .
The stresses developed in concrete and steel in reinforced concrete beam 25 cm width and 70 cm effective depth, are 62.5 kg/cm² and 250 kg/cm² respectively. If m = 15, the depth of its neutral axis is
A)  20 cm
A)  
B)  30 cm
B)  
C)  25 cm
C)  
D)  35 cm
D)  

Correct Answer :   30 cm

71 .
The angle of repose of a soil is the maximum angle which the outer face of the soil mass makes
A)  with the vertical
B)  with the horizontal
C)  with the perpendicular to. the inclined plane of the soil
D)  None of the above

Correct Answer :   with the horizontal

72 .
The self-weight of the footing, is
A)  not considered for calculating the area of the footing
B)  also considered for calculating the upward pressure on footihg
C)  not considered for calculating the upward pressure on footing
D)  None of the above

Correct Answer :   not considered for calculating the upward pressure on footing

73 .
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)  20
B)  25
C)  30
D)  40

Correct Answer :   20

74 .
If the length of an intermediate span of a continuous slab is 5m, the length of the end span is kept
A)  3.0 m
B)  3.5 m
C)  4.0 m
D)  4.5 m

Correct Answer :   4.5 m

75 .
The floor slab of a building is supported on reinforced cement floor beams. The ratio of the end and intermediate spans is kept
A)  0.6
B)  0.7
C)  0.8
D)  0.9

Correct Answer :   0.9

76 .
The number of treads in a flight is equal to
A)  risers plus one
B)  risers minus one
C)  risers in the flight
D)  None of the above

Correct Answer :   risers minus one

77 .
A short column 20 cm x 20 cm in section is reinforced with 4 bars whose area of cross section is 20 sq. cm. If permissible compressive stresses in concrete and steel are 40 kg/cm² and 300 kg/cm², the Safe load on the column, should not exceed
A)  4120 kg
A)  
B)  41, 200 kg
B)  
C)  412, 000 kg
C)  
D)  None of the above
D)  

Correct Answer :   41, 200 kg

78 .
The reinforced concrete beam which has width 25 cm, lever arm 40 cm, shear force 6t/cm², safe shear stress 5 kg/cm2 and B.M. 24 mt,
A)  is unsafe in shear
B)  is safe in shear
C)  needs redesigning
D)  is over safe in shear

Correct Answer :   is unsafe in shear

79 .
According to I.S. : 456 specifications, the safe diagonal tensile stress for M 150 grade concrete, is
A)  5 kg/cm²
B)  10 kg/cm²
C)  15 kg/cm²
D)  20 kg/cm²

Correct Answer :   5 kg/cm²

80 .
A pre-stressed concrete member
A)  is made of concrete
B)  is stressed after casting
C)  possesses internal stresses
D)  is made of reinforced concrete

Correct Answer :   possesses internal stresses.

81 .
A part of the slab may be considered as the flange of the T-beam if
A)  it is built integrally with the beam
B)  it is effectively bonded together with the beam
C)  flange has adequate reinforcement transverse to beam
D)  All of the above

Correct Answer :   All of the above

82 .
An R.C.C. roof slab is designed as a two way slab if
A)  the slab is discontinuous at edges
B)  the ratio of spans in two directions is less than 2
C)  the slab is continuous over two supports
D)  it supports live loads in both directions

Correct Answer :   the ratio of spans in two directions is less than 2

83 .
If C is creep coefficient, f is original prestress 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)  (C - 1)mf + eE
B)  (C - 1)mf - eE
C)  (1 - C)mf - eE
D)  (1 - C)mf + eE

Correct Answer :   (C - 1)mf + eE

84 .
In a combined footing for two columns carrying unequal loads, the maximum hogging bending moment occurs at
A)  less loaded column
B)  a point of the maximum shear force
C)  a point of zero shear force
D)  a point equidistant from either column

Correct Answer :   a point of zero shear force

85 .
If the ratio of the span to the overall depth does not exceed 10, the stiffness of the beam will ordinarily be satisfactory in case of a
A)  continuous beam
B)  cantilever beam
C)  simply supported beam
D)  None of the above

Correct Answer :   cantilever beam

86 .
The toe projection of foundation slabs is taken
A)  as one third of the base
B)  equal to heel slab
C)  below ground surface
D)  as one sixth of overall height of the wall

Correct Answer :   as one third of the base

87 .
Steel beam theory is used for
A)  design of simple steel beams
B)  steel beams encased in concrete
C)  beams if shear exceeds 4 times allowable shear stress
D)  doubly reinforced beams ignoring compressive stress in concrete

Correct Answer :   doubly reinforced beams ignoring compressive stress in concrete

88 .
A column is regarded as long column if the ratio of its effective length and lateral dimension, exceeds
A)  10
B)  15
C)  20
D)  25

Correct Answer :   15

89 .
Enlarged head of a supporting column of a flat slabs is technically .known as
A)  capital
B)  top of the column
C)  drop panel
D)  supporting end of the column

Correct Answer :   drop panel

90 .
The section of a reinforced beam where most distant concrete fibre in compression and tension in steel attains permissible stressess simultaneously, is called
A)  economic section
B)  balanced section
C)  critical section
D)  All of the above

Correct Answer :   All of the above

91 .
The width of the flange of a L-beam, should be less than
A)  one-sixth of the effective span
B)  breadth of the rib + four times thickness of the slab
C)  breadth of the rib + half clear distance between ribs
D)  least of the above

Correct Answer :   least of the above

92 .
If the maximum dip of a parabolic tendon carrying tension P is h and the effective length of the prestressed beam is L, the upward uniform pressure will be
A)  8hp / l
B)  8hp / l²
C)  8hl / p
D)  3hl / p

Correct Answer :   8hp / l²

93 .
A singly reinforced concrete beam of 25 cm width and 70 cm effective depth is provided with 18.75 cm² steel. If the modular ratio (m) is 15, the depth of the neutral axis, is
A)  30 cm
B)  35 cm
C)  40 cm
D)  50 cm

Correct Answer :   30 cm

94 .
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

Correct Answer :   2400 kg/m³

95 .
The zone in which transverse bending is likely to occur may be obtained by drawing a line from the faces of the column making an angle θ° with horizontal where θ° is
A)  30°
B)  45°
C)  60°
D)  None of the above

Correct Answer :   45°

96 .
According to load factor method, the permissible load W on a short column reinforced with longitudinal bars and lateral stirrups, is
A)  Stress in steel x area of steel
B)  Stress in concrete x area of concrete
C)  Stress in concrete x area of concrete + Stress in steel x area of steel
D)  None of the above

Correct Answer :   Stress in concrete x area of concrete + Stress in steel x area of steel

97 .
In a cantilever retaining wall without a heel slab
A)  thickness of the stem is kept same throughout
B)  base slab is made 10 cm thicker than the stem
C)  width of the base slab is kept 0.7 time the total height of the wall
D)  All of the above

Correct Answer :   All of the above

98 .
A per IS : 1343, total shrinkage for a pretensioned beam, is
A)  3.0 x 10⁻³
B)  3.0 x 10⁻⁴
C)  3.0 x 10⁻⁵
D)  3.5 x 10⁻⁵

Correct Answer :   3.5 x 10⁻⁵

99 .
Lapped splices in tensile reinforcement are generally not used for bars of size larger than
A)  36 mm diameter
B)  32 mm diameter
C)  30 mm diameter
D)  24 mm diameter

Correct Answer :   36 mm diameter

100 .
An R.C.C. beam of 6 m span is 30 cm wide and has a lever arm of 55 cm. If it carries a U.D.L. of 12 t per m and allowable shear stress is 5 kg/cm², the beam
A)  is safe in shear
A)  
B)  is safe with stirrups
B)  
C)  needs revision of section
C)  
D)  is safe with stirrups and inclined bars
D)  

Correct Answer :   needs revision of section

101 .
In a slab, the pitch of the main reinforcement should not exceed its effective depth
A)  two times
B)  three times
C)  four times
D)  five times

Correct Answer :   three times

102 .
The modular ratio m of a concrete whose permissible compressive stress is C, may be obtained from the equation.
A)  m = 700/3C
B)  m = 1400/3C
C)  m = 2800/3C
D)  m = 3500/3C

Correct Answer :   m = 2800/3C

103 .
Thickened part of a flat slab over its supporting column, is technically known as
A)  drop panel
B)  capital
C)  column head
D)  None of the above

Correct Answer :   drop panel

104 .
An R.C.C. beam not provided with shear reinforcement may develop cracks in its bottom inclined roughly to the horizontal at
A)  25°
B)  35°
C)  45°
D)  55°

Correct Answer :   45°

105 .
The effective span of a simply supported slab, is
A)  clear span plus effective depth of the slab
B)  distance between the centres of the bearings
C)  clear distance between the inner faces of the walls plus twice the thickness of the wall
D)  None of the above

Correct Answer :   clear distance between the inner faces of the walls plus twice the thickness of the wall

106 .
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 of the above

Correct Answer :   All of the above

107 .
The thickness of the flange of a Tee beam of a ribbed slab is assumed as
A)  width of the rib
B)  depth of the rib
C)  twice the width of the rib
D)  thickness of the concrete topping 0d) half the thickness of the rib

Correct Answer :   thickness of the concrete topping 0d) half the thickness of the rib

108 .
In a singly reinforced beam, if the permissible stress in concrete reaches earlier than that in steel, the beam section is called
A)  critical section
B)  over reinforced section
C)  economic section
D)  under-reinforced section

Correct Answer :   over reinforced section

109 .
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)  24 bar diameters
B)  18 bar diameters
C)  12 bar diameters
D)  10 bar diameters

Correct Answer :   24 bar diameters

110 .
The minimum cube strength of concrete used for a prestressed member, is
A)  50 kg/cm²
B)  150 kg/cm²
C)  250 kg/cm²
D)  350 kg/cm²

Correct Answer :   350 kg/cm²

111 .
The diameter of longitudinal bars of a column should never be less than
A)  12 mm
B)  10 mm
C)  8 mm
D)  6 mm

Correct Answer :   12 mm

112 .
The design of a retaining wall assumes that the retained earth
A)  is dry
B)  is not cohesives
C)  is free from moisture
D)  All of the above

Correct Answer :   All of the above

113 .
Dimensions of a beam need be changed if the shear stress is more than
A)  25 kg/cm²
B)  20 kg/cm²
C)  15 kg/cm²
D)  10 kg/cm²

Correct Answer :   20 kg/cm²

114 .
Piles are usually driven by
A)  drop hammer
B)  diesel operated hammer
C)  single acting steam hammer
D)  All of the above

Correct Answer :   All of the above

115 .
In favourable circumstances a 15 cm concrete cube after 28 days, attains a maximum crushing strength
A)  200 kg/cm²
B)  300 kg/cm²
C)  400 kg/cm²
D)  500 kg/cm²

Correct Answer :   400 kg/cm²

116 .
The angle of internal friction of soil mass is the angle whose
A)  tangent is equal to the rate of the maximum resistance to sliding on any internal inclined plane to the normal pressure acting on the plane
B)  cosine is equal to the ratio of the maximum resistance sliding on any internal inclined plane to the normal pressure acting on the plane
C)  sine is equal to the ratio of the maximum resistance to sliding on any internal inclined plane to the normal pressure acting on the plane
D)  None of the above

Correct Answer :   tangent is equal to the rate of the maximum resistance to sliding on any internal inclined plane to the normal pressure acting on the plane

117 .
The shear reinforcement in R.C.C. is provided to resist
A)  vertical shear
B)  diagonal tension
C)  horizontal shear
D)  diagonal compression

Correct Answer :   diagonal tension

118 .
An R.C.C. column of 30 cm diameter is reinforced with 6 bars 12 mm φ placed symmetrically along the circumference. If it carries a load of 40, 000 kg axially, the stress is
A)  49.9 kg/cm²
A)  
B)  100 kg/cm²
B)  
C)  175 kg/cm²
C)  
D)  250 kg/cm²
D)  

Correct Answer :   49.9 kg/cm²

119 .
A pile of length L carrying a uniformly distributed load W per metre length is suspended at two points, the maximum, B.M. at the centre of the pile or at the points of suspension, is
A)  WL²/24
A)  
B)  WL²/47
B)  
C)  WL²/26
C)  
D)  WL²/16
D)  

Correct Answer :   WL²/47

120 .
The horizontal portion of a step in a stairs case, is known as
A)  tread
B)  rise
C)  winder
D)  flight

Correct Answer :   tread

121 .
The length of lap in tension reinforcement should not be less than the bar diameter x (actual tension / four times the permissible average bond stress) if it is more than
A)  18 bar diameters
B)  24 bar diameters
C)  30 bar diameters
D)  36 bar diameters

Correct Answer :   30 bar diameters

122 .
Distribution reinforcement in a simply supported slab, is provided to distribute
A)  load
B)  shrinkage stress
C)  temperature stress
D)  All of the above

Correct Answer :   All of the above

123 .
To ensure that the hogging bending moment at two points of suspension of a pile of length L equals the sagging moment at its centre, the distances of the points of suspension from either end, is
A)  0.107 L
A)  
B)  0.207 L
B)  
C)  0.307 L
C)  
D)  0.407 L
D)  

Correct Answer :   0.207 L

124 .
The thickness of the topping of a ribbed slab, varies between
A)  12 cm to 15 cm
B)  8 cm to 10 cm
C)  5 cm to 8 cm
D)  3 cm to 5 cm

Correct Answer :   5 cm to 8 cm

125 .
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

Correct Answer :   200 KN/mm²

126 .
The maximum permissible size of aggregates to be used in casting the ribs of a slab, is
A)  10 mm
B)  15 mm
C)  20 mm
D)  25 mm

Correct Answer :   10 mm

127 .
In a simply supported slab, alternate bars are curtailed at
A)  1/4th of the span
B)  1/5th of the span
C)  1/6th of the span
D)  1/7th of the span

Correct Answer :   1/7th of the span

128 .
In a prestressed member it is advisable to use
A)  high strength concrete only
B)  low strength concrete but high tensile steel
C)  high strength concrete and high tensile steel
D)  high strength concrete but low tensile steel

Correct Answer :   high strength concrete and high tensile steel

129 .
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)  width of the stem at the bottom
C)  one-third of the width of the stem at the bottom
D)  one fourth of the width of the steam at the bottom

Correct Answer :   width of the stem at the bottom

130 .
For a circular slab carrying a uniformly distributed load, the ratio of the maximum negative to maximum positive radial moment, is
A)  1
B)  2
C)  3
D)  4

Correct Answer :   3

131 .
If a bent tendon is required to balance a concentrated load W at the centre of the span L, the central dip h must be at least
A)  WL/P
B)  WL/2P
C)  WL/3P
D)  WL/4P

Correct Answer :   WL/4P

132 .
For M 150 mix concrete, according to I.S. specifications, local bond stress, is
A)  10 kg/cm²
B)  15 kg/cm²
C)  20 kg/cm²
D)  None of the above

Correct Answer :   10 kg/cm²

133 .
If the average bending stress is 6 kg/cm² for M 150 grade concrete, the length of embedment of a bar of diameter d according to I.S. 456 specifications, is
A)  38 d
A)  
B)  48 d
B)  
C)  58 d
C)  
D)  95 d
D)  

Correct Answer :   58 d

134 .
Bottom bars under the columns are extended into the interior of the footing slab to a distance greater than
A)  24 diameter from the centre of the column
B)  42 diameters from the centre of the column
C)  42 diameters from the outer edge of the column
D)  42 diameters from the inner edge of the column

Correct Answer :   42 diameters from the outer edge of the column

135 .
Top bars are extended to the projecting parts of the combined footing of two columns L distance apart for a distance of
A)  half the distance of projection
B)  0.1 L from the centre edge of column
C)  0.1 L from the outer edge of column
D)  one-fourth the distance of projection

Correct Answer :   0.1 L from the centre edge of column

136 .
To ensure uniform pressure distribution, the thickness of the foundation, is
A)  kept zero at the edge
B)  kept uniform throughout
C)  increased gradually towards the edge
D)  decreased gradually towards the edge

Correct Answer :   decreased gradually towards the edge

137 .
The maximum ratio of span to depth of a cantilever slab, is
A)  10
B)  12
C)  14
D)  16

Correct Answer :   12

138 .
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
A)  shear force
B)  area of the section
C)  moment of the beam section about its neutral axis
D)  distance of the C.G. of the area from its neutral axis

Correct Answer :   moment of the beam section about its neutral axis

139 .
In a singly reinforced beam, the effective depth is measured from its compression edge to
A)  tensile reinforcement
B)  tensile edge
C)  neutral axis of the beam
D)  longitudinal central axis

Correct Answer :   tensile reinforcement

140 .
If a rectangular prestressed 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
A)  
B)  10 cm
B)  
C)  15 cm
C)  
D)  20 cm
D)  

Correct Answer :   10 cm

141 .
If the maximum shear stress at the end of a simply supported R.C.C. beam of 16 m effective span is 10 kg/cm², the length of the beam having nominal reinforcement, is
A)  6 m
A)  
B)  8 m
B)  
C)  10 m
C)  
D)  4 cm
D)  

Correct Answer :   8 m

142 .
The diameter of main bars in R.C.C. columns, shall not be less than
A)  6 mm
B)  8 mm
C)  10 mm
D)  12 mm

Correct Answer :   12 mm

143 .
The breadth of a ribbed slab containing two bars must be between
A)  6 cm to 7.5 cm
B)  8 cm to 10 cm
C)  10 cm to 12 cm
D)  12 cm to 15 cm

Correct Answer :   8 cm to 10 cm

144 .
The minimum thickness of the cover at the end of a reinforcing bar should not be less than twice the diameter of the bar subject to a minimum of
A)  15 mm
B)  20 mm
C)  25 mm
D)  30 mm

Correct Answer :   25 mm

145 .
The ratio of the breadth to effective depth of a beam is kept
A)  0.25
B)  0.50
C)  0.70
D)  0.75

Correct Answer :   0.50

146 .
Spacing of stirrups in a rectangular beam, is
A)  increased at the ends
B)  kept constant throughout the length
C)  decreased towards the centre of the beam
D)  increased at the centre of the beam

Correct Answer :   increased at the centre of the beam

147 .
If the width of the foundation for two equal columns is restricted, the shape of the footing generally adopted, is
A)  rectangular
B)  square
C)  triangular
D)  trapezoidal

Correct Answer :   rectangular

148 .
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

Correct Answer :   0.9

149 .
Steel bars are generally connected together to get greater length than the standard length by providing
A)  dowel splice
B)  hooked splice
C)  strainght bar splice
D)  All of the above

Correct Answer :   All of the above

150 .
By over-reinforcing a beam, the moment of resistance can be increased not more than
A)  25%
B)  20%
C)  15%
D)  10%

Correct Answer :   25%

151 .
An R.C.C. column is treated as long if its slenderness ratio is greater than
A)  60
B)  50
C)  40
D)  30

Correct Answer :   50

152 .
The width of the flange of a T-beam should be less than
A)  distance between the centres of T-beam
B)  one-third of the effective span of the T-beam
C)  breadth of the rib plus twelve times the thickness of the slab
D)  least of the above

Correct Answer :   least of the above

153 .
Pick up the correct statement from the following :
A)  A pile is a slender member which transfers its load by friction
A)  
B)  A pile is a slender member which transfers its load to the surrounding soil
B)  
C)  A pile is a slender member which transfers the load through its lower end on a strong strata
C)  
D)  A pile is a cylindrical body of concrete which transfers the load at a depth greater than its width
D)  

Correct Answer :   A pile is a slender member which transfers its load to the surrounding soil

154 .
Cantilever retaining walls can safely be used for a height not more than
A)  2 m
B)  4 m
C)  6 m
D)  8 m

Correct Answer :   6 m

155 .
In a combined footing if shear stress exceeds 5 kg/cm², the nominal stirrups provided are :
A)  12 legged
B)  10 legged
C)  8 legged
D)  6 legged

Correct Answer :   12 legged

156 .
The maximum area of tension reinforcement in beams shall not exceed
A)  1%
B)  4%
C)  1.5%
D)  0.15%

Correct Answer :   4%

157 .
As per I.S. 456 - 1978, the pH value of water shall be
A)  equal to 6
B)  less than 6
C)  equal to 7
D)  not less than 6

Correct Answer :   not less than 6

158 .
If the diameter of longitudinal bars of a square column is 16 mm, the diameter of lateral ties should not be less than
A)  8 mm
B)  6 mm
C)  5 mm
D)  4 mm

Correct Answer :   5 mm

159 .
If the depth of actual neutral axis of a doubly reinforced beam
A)  is greater than the depth of critical neutral axis, the concrete attains its maximum stress earlier
B)  is less than the depth of critical neutral axis, the steel in the tensile zone attains its maximum stress earlier
C)  is equal to the depth of critical neutral axis, the concrete and steel attain their maximum stresses simultanesouly
D)  All of the above

Correct Answer :   All of the above

160 .
The length of the straight portion of a bar beyond the end of the hook, should be at least
A)  seven times the diameter
B)  five times the diameter
C)  four times the diameter
D)  thrice the diameter

Correct Answer :   seven times the diameter

161 .
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
A)  14 cm²
A)  
B)  15 cm²
B)  
C)  16 cm²
C)  
D)  17 cm²
D)  

Correct Answer :   16 cm²

162 .
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)  15
B)  20
C)  25
D)  30

Correct Answer :   20

163 .
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)  lever arm of the section
A)  
B)  one-half lever arm of the section
B)  
C)  one-third lever arm of the section
C)  
D)  one and half lever arm of the section
D)  

Correct Answer :   lever arm of the section

164 .
In a singly reinforced beam
A)  compression is borne entirely by concrete
B)  plane sections transverse to the centre line of the beam before bending remain plane after bending
C)  steel possesses initial stresses when em-beded in concrete
D)  elastic modulii for concrete and steel have different values within the limits of deformation of the beam

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

165 .
A pre-cast pile generally used, is
A)  square
B)  circular
C)  octagonal
D)  square with corners chamfered

Correct Answer :   square with corners chamfered

166 .
On an absolutely rigid foundation base, the pressure will
A)  be uniform
B)  not be uniform
C)  be more at the edges of the foundation
D)  be zero at the centre of the foundation

Correct Answer :   not be uniform

167 .
As per IS : 456, the reinforcement in a column should not be less than
A)  0.6% and not more than 6% of cross-see-tional area
B)  0.7% and not more than 7% of cross-sec-tional area
C)  0.8% and not more than 8% of cross-sectional area
D)  None of the above

Correct Answer :   0.8% and not more than 8% of cross-sectional area

168 .
If the bearing capacity of soil is 10 tonnes/cm² and the projection of plain concrete footing from walls, is a cm, the depth D of footing is
A)  D = 0.775 a
A)  
B)  D = 0.0775 a
B)  
C)  D = 0.775√a
C)  
D)  D = 0.775 a²
D)  

Correct Answer :   D = 0.775 a

169 .
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)  UDL of wall
A)  
B)  triangular load of the wall
B)  
C)  UDL of wall + load from the roof
C)  
D)  triangular load + load from the roof
D)  

Correct Answer :   UDL of wall + load from the roof

170 .
The pitch of the main bars in a simply supported slab, should not exceed its effective depth by
A)  six times
B)  five times
C)  four times
D)  three times

Correct Answer :   six times

171 .
The minimum thickness of a flat slab is taken
A)  L/32 for end panels without drops
B)  L/36 for end panels without drops
C)  L/36 for interior panels without drop
D)  All of the above

Correct Answer :   All of the above

172 .
According to I.S. : 456, slabs which span in two directions with corners held down, are assumed to be divided in each direction into middle strips and edge strips such that the width of the middle strip, is
A)  half of the width of the slab
A)  
B)  two-third of the width of the slab
B)  
C)  three-fourth of the width of the slab
C)  
D)  four-fifth of the width of the slab
D)  

Correct Answer :   three-fourth of the width of the slab

173 .
Minimum spacing between horizontal parallel reinforcement of the same size should not be less than
A)  one diameter
B)  2.5 diameters
C)  3 diameters
D)  3.5 diameters

Correct Answer :   one diameter

174 .
Columns may be made of plain concrete if their unsupported lengths do not exceed their least lateral dimension
A)  five times
B)  four times
C)  three times
D)  two times

Correct Answer :   four times

175 .
An R.C.C. column is treated as short column if its slenderness ratio is less than
A)  30
B)  35
C)  45
D)  50

Correct Answer :   50

176 .
The minimum number of main steel bars provided in R.C.C.
A)  rectangular columns is 4
B)  circular columns is 6
C)  octagonal columns is 8
D)  All of the above

Correct Answer :   All of the above

177 .
Post tensioning system
A)  was widely used in earlier days
B)  is not economical and hence not generally used
C)  is economical for large spans and is adopted now a days
D)  None of the above

Correct Answer :   is economical for large spans and is adopted now a days

178 .
Distribution of shear intensity over a rectangular section of a beam, follows :
A)  a straight line
B)  a parabolic curve
C)  a circular curve
D)  an elliptical curve

Correct Answer :   a parabolic curve

179 .
The maximum diameter of a bar used in a ribbed slab, is
A)  22 mm
B)  20 mm
C)  12 mm
D)  6 mm

Correct Answer :   22 mm

180 .
The maximum ratio of span to depth of a slab simply supported and spanning in one direction, is
A)  20
B)  25
C)  30
D)  35

Correct Answer :   30

181 .
If W is the load on a circular slab of radius R, the maximum radial moment at the centre of the slab, is
A)  2WR²/16
B)  3WR²/16
C)  4WR²/16
D)  5WR²/16

Correct Answer :   3WR²/16

182 .
For M 150 grade concrete (1:2:4) the moment of resistance factor is
A)  0.87
B)  5.80
C)  7.50
D)  8.50

Correct Answer :   8.50

183 .
The maximum ratio of span to depth of a slab simply supported and spanning in two directions, is
A)  25
B)  30
C)  35
D)  40

Correct Answer :   35

184 .
The neutral axis of a T-beam exists
A)  within the flange
B)  below the slab
C)  at the bottom edge of the slab
D)  All of the above

Correct Answer :   All of the above

185 .
A very comfortable type of stairs is
A)  open newel
B)  straight
C)  dog legged
D)  geometrical

Correct Answer :   open newel

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