75+ most important Structural Design 2 mcqs

Q. 1. The maximum ratio of span to depth of a slab simply supported and
spanning in two directions, is
A : 10
B : 20
C : 35
D : 50

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35

Q. 2. Why is the design of RC section as a over reinforced is undesirable?
A : It consumes more concrete
B : It undergoes high strains
C : It fails suddenly
D : Its appearance is not good

It fails suddenly

Q. 4. The effective cover of beam depends on beam
A : Diameter of main reinforcement
B : Grade of steel
C : Width of beam
D : Depth of beam

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Diameter of main reinforcement

Q. 5. Limit state method is consider as
A : Safety at Ultimate Load
B : Serviceability at working load
C : Safety at working load
D : Both A & B

Both A & B

Q. 6. When assessing the strength of a strcture or structural member for the
limit stale of collapse, the value of partial safety factor should be taken for steel
as ….

A : 1.25
B : 1.5
C : 1.15
D : 2

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1.15

Q. 7. The high strength deformed reinforcing bars in either directions in slabs,
shall not be less than …….. of the total cross sectional area of slab

A : 0.15%
B : 0.12%
C : 0.18%
D : 0.1%

0.12%

Q. 8. The deflection of the slab can be kept under control if the ratios of
effective span to effective depth of one-way slabs are taken up from the
provisions as per

A : IS 456
B : IS 875
C : IS 1343
D : IS 3370

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IS 456

Q. 9. Minimum grade of concrete used in design of R.C structure as per IS
456:2000

A : M10
B : M20
C : M25
D : M30

M20

Q. 10. In some staircases, the tread is projected outward to increase the space.
This projection is designated as

A : landing
B : going
C : rising
D : nosing

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nosing

Q. 12. As per IS 456 : 2000 Code, permissible stress in flexural tension for HYSD
bars of grade FE 415 is

A : 130
B : 140
C : 230
D : 275

230

Q. 13. For spans above 10 m,the basic values may be multiplied by ……… in
metres

A : 10/Span
B : 20/Span
C : 30/Span
D : None from the options

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10/Span

Q. 14. The Traditional method of design is based on
A : Linear elastic theory
B : Linear plastic theory
C : Elastic theory
D : Plastic theory

Linear elastic theory

Q. 15. Consider the following statements with regards to the combination of
partial safety factor for loads under limit state of collapse will be
1) 1.5 (D.L. + L.L.)
2) 1.5 (D.L. + W.L.)
3) 1.2 (D.L. + L.L. + W.L.)

A : 1 Only
B : 1 and 2
C : 2 and 3
D : All

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All

Q. 16. Maximum spacing of distribution reinforcement shall not be more than
A : 3d or 300 mm whichever is smaller
B : 3d or 300 mm whichever is greater
C : 5d or 450 mm whichever is smaller
D : 5d or 450 mm whichever is greater

5d or 450 mm whichever is smaller

Q. 17. Basic values of span to effective depth ratios for spans up to 10 m in case
of continuous beam is

A : 7
B : 20
C : 26
D : 10

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26

Q. 18. Value of Partial Safety Factor for Loads in combination of Dead Load +
Imposed Load under Limit State of Collapse is

A : 1.5
B : 1
C : 0.9
D : 1.2

1.5

Q. 19. In case of two way slab the deflection of slab is–
A : Primary function of long span
B : Primary function of short span
C : Independent of span, short or long
D : Mostly long span but sometimes short span

Primary function of short span

Q. 20. A T-beam behaves as a rectangular beam of width equal to its flange if its
Neutral Axis

A : Coincides with centroid of reinforcement
B : Coincides with cetroid of T-section
C : Remains with in the flange
D : Remains in the web

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Remains with in the flange

Q. 21. In limit state method, partial safety factors for steel and concrete are
defined. The ratio of partial safety factor of steel to partial safety factor of
concrete is

A : 0.77
B : 0.85
C : 1
D : 1.15

0.77

Q. 22. Considering modular ratio as 13, grade of concrete as M30 and grade of
steel as 415, what is the balanced depth of neutral axis as per working stress
method?

A : 0.48d
B : 0.45d
C : 0.36d
D : 0.53 d

0.36d

Q. 23. If b is width of the section and D is overall depth of the section. The
maximum area of tension reinforcement shall not exceed….

A : 0.4 bD
B : 0.14 bD
C : 0.04 bD
D : 0.004 bD

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0.04 bD

Q. 24. In longitudinally spanned staircase, main reinforcement is provided….
A : along the span of flight
B : along the width of flight
C : along both directions
D : in going portion

along the span of flight

Q. 25. A higher modular ratio shows —-
A : Higher compressive strength of concrete
B : Lower compressive strength of concrete
C : Higher tensile strength of concrete
D : Lower tensile strength of concrete

Lower compressive strength of concrete

Q. 26. As per IS 456 : 2000 Code, permissible stress in compression in column for
HYSD bars of grade FE 415 is

A : 140
B : 190
C : 230
D : 275

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190

Q. 27. Percentage of steel for balanced design of a singly reinforced rectangular
section by limit state method depends on A) Characteristic strength of concrete B)
Yield strength of steel C) Modulus of Elasticity of Steel D) Geometry of section

A : Only B
B : A), B) & D)
C : A), B) & C)
D : All

A), B) & C)

Q. 28. The side distance of torsion reinforcement at corner of the slab in 2 way
restrained slabs is …..

A : Longer Span/5
B : Longer Span/4
C : Shorter Span/4
D : Shorter Span/5

Shorter Span/5

Q. 29. 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

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Maximum bending moment

Q. 30. In the 2 way continuous slabs, tension reinforcement for negative
moment at supports should be ……… that provided at mid-span steel area.

A : 40%
B : 25%
C : 50%
D : 60%

50%

Q. 31. For Fe 250, the percentage of minimum reinforcement of the gross
sectional area in slabs, is

A : 001
B : 0012
C : 0015
D : 0018

0015

Q. 32. For slab with 8mm dia bars, minimum nominal clear cover required
under moderate exposure condition is

A : 15mm
B : 20mm
C : 25mm
D : 30mm

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30mm

Q. 33. As per IS 456 : 2000 Code, permissible stress in flexural tension for HYSD
bars of grade FE 500 is

A : 130
B : 140
C : 230
D : 275

275

Q. 34. If b is width of the section and d is effective depth of the section, and fy is
yield stress in steel. The minimum area of tension reinforcement shall be not less
than……..

A : 0.85 bd/fy
B : 0.87 bd/fy
C : 0.36 bd/fy
D : 0.67 bd/fy

0.85 bd/fy

Q. 35. The short-term elastic modulus of M40 concrete as per IS 456:2000 is
____________ MPa

A : 31622.8
B : 32000.3
C : 40400.8
D : 31422.8

31622.8

Q. 36. According to worksing stress method as per IS 456:2000, for grade of
concrete : M20 and grade of steel :Fe415, the balanced percentage of steel will be

A : 0.23800000000000002%
B : 0.438%
C : 0.638%
D : 0.8380000000000001%

0.438%

Q. 37. As per IS 456 : 2000 Code, the yield stress for steels for which there is no
clearly defined yield point should be taken tobe

A : Upper yield point
B : Lower yield point
C : 0.2 percent proof stress
D : 1.5 percent proof stress

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0.2 percent proof stress

Q. 38. Critical Section for Shear in case of simply supported beam is
A : at a distance of effective depth from the face of the support
B : at a distance of half the effective depth from the face of support
C : at the face of the support
D : None from the options

at a distance of effective depth from the face of the support

Q. 39. When the comers of a slab are prevented from lifting, the slab may be
designed as

A : Restrained Slabs
B : Simply Supported Slabs
C : Cantilever Slabs
D : None from the options

Restrained Slabs

Q. 40. The singly reinforced balanced design givesA : Smallest cross sectional area
B : Maximum area of steel
C : Smallest cross sectional area and maximum area of steel
D : Largest cross sectional area

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Smallest cross sectional area and maximum area of steel

Q. 41. For continuous two way slab of effective spans 3.2 x 4.5m subjected to
live load of 2.5kN/sqm, calculate effective depth by serviceability criteria.
Consider modification factor 1.4 and Fe415 steel

A : 123.6
B : 114
C : 71.4
D : 81.6

71.4

Q. 42. The rectangular beam of width, 300 mm is having effective depth of 365
mm. The concrete grade is M20 and the grade of reinforcing steel is Fe415. The
tensile reinforcement is provided by 3-20 mm dia bars. As per limit state method,
the moment of resistance due to steel is equal to :

A : 51.010 kNm
B : 76.515 kNm
C : 102.020 kNm
D : 127.526 kNm

102.020 kNm

Q. 43. The rectangular beam of width, 300 mm is having effective depth of 365
mm. The concrete grade is M20 and the grade of reinforcing steel is Fe415. As per
limit state method, the area of steel in a balanced section is :

A : 1046 sqmm
B : 1151 sqmm
C : 1256 sqmm
D : 1360sqmm

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1046 sqmm

Q. 44. For simply supported two way slab of effective spans 3.2 x 4.5m subjected
to live load of 3.5kN/sqm, calculate effective depth by serviceability criteria.
Consider modification factor 1.4 and Fe415 steel

A : 123.6
B : 114.3
C : 87.9
D : 81.6

114.3

Q. 45. Design the factored load for one-way continuous slab of thickness
140mm, subjected to uniformly distributed imposed loads of 5 kN/sqm . The load
of floor finish is 1 kN/sqm.

A : 14.25 kN/m
B : 16.25 kN/m
C : 12.25 kN/m
D : 15.25 kN/m

14.25 kN/m

Q. 46. A beam section 300mm wide and 560mm deep is reinforced with 4 bars of
25mm diameter in the tensile zone and 4 bars of 12mm diameter in the
compression zone. The cover to the centre of both the reinforcement is 40mm.
Determine critical depth of neutral axis if M20 concrete and HYSD bar are used.

A : 194.6 mm
B : 210.4 mm
C : 150.1 mm
D : 202.3 mm

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150.1 mm

Q. 47. For continuous two way slab of effective spans 3.2 x 4.5m subjected to
live load of 3.5kN/sqm, calculate effective depth by serviceability criteria.
Consider modification factor 1.4 and Fe415 steel

A : 123.6
B : 114
C : 71.4
D : 87.9

87.9

Q. 48. A beam section 300mm wide and 560mm deep is reinforced with 4 bars of
25mm diameter in the tensile zone and 4 bars of 12mm diameter in the
compression zone. The cover to the centre of both the reinforcement is 40mm.
Determine actual depth of neutral axis if M20 concrete and HYSD bar are used.

A : 194.6 mm
B : 210.4 mm
C : 150.1 mm
D : 202.3 mm

210.4 mm

Q. 49. Determine critical depth of neutral axis of a singly reinforced beam 160
mm wide and 300 mm deep to the centre of reinforcement, if the stress in steel
and concrete are not to exceed 140 N/sqmm and 5 Nsq/mm. The reinforcement
consists of 4 bars of 16 mm diameter. Take m=18.

A : 165.9 mm
B : 159.5 mm
C : 175.4 mm
D : 117.4 mm

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117.4 mm

Q. 50. An R.C. beam 300 mm X 565 mm effective depth is reinforced with 4 no.
20 mm diameter bars in tension. Find out the depth of N.A. The materials are M20
grade of concrete and HYSD reinforcement of grade Fe415.

A : 150 mm
B : 203 mm
C : 130 mm
D : 200 mm

203 mm

Q. 51. The rectangular beam of width, 300 mm is having overall depth 380mm.
The tensile reinforcement is provided by 4-20mm dia bars. The clear cover is
25mm. The moment capacity of the section due to concrete as per LSM using M20
concrete and Fe415 steel is……

A : 73.799 kNm
B : 98.550 kNm
C : 122.998 kNm
D : 147.598 kNm

98.550 kNm

Q. 52. If the main reinforcement of the slab is parallel in case of the flanged
beam, transverse reinforcement shall be provided; such reinforcement shall not
be less than ……. of the main reinforcementat mid span of the slab.

A : 30%
B : 40%
C : 60%
D : 70%

60%

Q. 53. The surface width of the cracks should not, in general, exceed ……. in
members where cracking is not harmful and does not have any serious adverse
effects
upon the preservation of reinforcing steel nor upon the durability of the
structures.

A : 0.2 mm
B : 0.3 mm
C : 0.4 mm
D : 0.5 mm

0.3 mm

Q. 54. For simply supported one way slab of effective span 4.3m, subjected to
ultimate dead load 6.75kN/sqm & ultimate live load 3kN/sqm, calculate ultimate
maximum bending moment

A : 15
B : 22.5
C : 18
D : 32

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22.5

Q. 55. Where a member is built into a masonry wall which develops only partial
restraint. the member shall be designed to resist a negative moment at the face of
the support of ……………… where ‘W’ is the total design load and ‘L’ is the effective
span

A : WL/36
B : WL/24
C : WL/10
D : WL/18

WL/24

Q. 56. The rectangular beam of width, 250mm is having effective depth of
327mm. The concrete grade is M20 and the grade of reinforcing steel is Fe 415. The
position of neutral axis from compression side is

A : 274 mm
B : 235 mm
C : 196 mm
D : 157 mm

157 mm

Q. 57. If area of steel for maximum mid span moment is 205 sqmm, what would
be the area required for the torsion reinforcement when both edges are
discontinuous?

A : 153.75 sq.mm
B : 205 sq.mm
C : 102.5 sq.mm
D : 41 sq.mm

153.75 sq.mm

Q. 58. For simply supported two way slab of effective spans 3.2 x 4.5m subjected
to live load of 2.5kN/sqm, calculate effective depth by serviceability criteria.
Consider modification factor 1.4 and Fe415 steel

A : 123.6
B : 114
C : 87.9
D : 81.6

81.6

Q. 59. Side face reinforcement is required if the depth of the section is more
than…..

A : 750 mm
B : 650 mm
C : 450 mm
D : 850 mm

750 mm

Q. 60. The rectangular beam of width, 250mm is having effective depth of
327mm. The concrete grade is M20 and the grade of reinforcing steel is Fe 415. The
tensile steel is provided by 2-16mm dia bars. The moment of resistance due to
steel as per LSM is—

A : 21.315 kNm
B : 31.973 kNm
C : 42.550 kNm
D : 53.288 kNm

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42.550 kNm

Q. 61. While designing multistorey structures, IS Code suggests reduction in live
loads because

A : Of the cantilever effect of the building.
B : Thickness of roof slab is smaller than the thickness of floor slabs
C : Cross-section of the columns are different at different floors.
D : All the floors may not be loaded simultaneously.

All the floors may not be loaded simultaneously.

Q. 62. The number given for IS code of practice for design of dead loads (other
than earthquake) for buildings and structures is

A : IS 875 (part 1).
B : IS 875 (part 2).
C : IS 875 (part 3).
D : IS 875 (part 4).

IS 875 (part 1).

Q. 63. The effective span of the simply supported flexure member is
A : Clear span plus the effective depth of the section
B : c/c distance between the two supports
C : Clear span plus the effective depth of the section, and c/c distance between the two
supports, whichever is less
D : Clear span

Clear span plus the effective depth of the section, and c/c distance between the two supports, whichever is less

Q. 64. The modular ratio used in working stress method means
A : the ratio of moduli of elasticity of steel and coarse aggregates
B : the ratio of moduli of elasticity of concrete and coarse aggregates
C : the ratio of moduli of elasticity of concrete and steel
D : the ratio of moduli of elasticity of steel and concrete

the ratio of moduli of elasticity of steel and concrete

Q. 65. The effective span of cantilever beam is
A : Length from free end to the face of the support plus half the effective depth
B : Clear span plus the effective depth of the section
C : Clear span
D : None from the options

Length from free end to the face of the support plus half the effective depth

Q. 66. The diameter of bars used for distribution reinforcement in slabs, may
vary from

A : 2 to 6 mm
B : 6 to 8 mm
C : 10 to 12 mm
D : 12 to 16 mm

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6 to 8 mm

Q. 67. In one way slab, depth is obtained from
A : exposure conditions
B : serviceability conditions
C : severe conditions
D : weather conditions

serviceability conditions

Q. 68. The basic assumption of plane section normal to the axis of beam before
bending remains plane after bending, implies that

A : uniform stress over the beam cross-section
B : uniform strain over the beam cross-section
C : linearly varying strain over the cross-section
D : stresses which are proportional to strains at the cross-section

linearly varying strain over the cross-section

Q. 69. The number given for Indian Standard code for plain and reinforced
concrete is

A : IS456
B : IS800
C : IS875
D : IS1343

IS456

Q. 70. For reinforced concrete members that are totally immersed in seawater,
the additional minimum nominal cover thickness to be provided is

A : 25 mm
B : 30 mm
C : 39 mm
D : 45 mm

25 mm

Q. 71. A two way slab
A : may be simply supported on the four edges, with corners not held down and
carrying uniformely distributed load.
B : may be simply supported on the four edges, with corners held down and carryin
guniformely distributed load.
C : may have edges fixed or continuous and carrying uniformly distributed load
D : all of the above

all of the above

Q. 72. Maximum spacing of main reinforcement shall not be more than
A : 3d or 300 mm whichever is smaller
B : 3d or 300 mm whichever is greater
C : 5d or 450 mm whichever is smaller
D : 5d or 450 mm whichever is greater

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3d or 300 mm whichever is smaller

Q. 73. Flexural collapse in over reinforced beams is due to
A : Primary compression failure
B : Secondary compression failure
C : Primary tension failure
D : Bond failure

Primary compression failure

Q. 74. The concrete on tension side of neutral axis is useful because
A : it holds the reinforcing bars in place
B : it prevents the bars from corrosion
C : it resists the applied moment in uncracked phase of concrete
D : All of the above

All of the above

Q. 75. The modular ratio considered in the working stress method depends on
A : the grade of steel used.
B : the grade of concrete used.
C : the grade of steel and concrete used.
D : grade of PCC

the grade of concrete used.

Q. 76. A simply supported beam carries a working live load of 2.5 kN/m and
dead load is 3.5 kN/m. The design load for limit state of collapse in kN/m is…

A : 6
B : 9
C : 12
D : 6.9

9

Q. 77. In case of under reinforced beam section,
A : actual depth of neutral axis is less than the critical depth of neutral axis
B : moment of resistance is less than that of balanced sections
C : both (a) and (b)
D : actual depth of neutral axis is more than the critical depth of neutral axis

both (a) and (b)

Q. 78. The centroid of compressive force, from extreme compression fibre in
limit state design lies at a distance of

A : 0.367 Xu
B : 0.416 Xu
C : 0.446 Xu
D : 0.573 Xu

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0.416 Xu

Q. 79. For moments at supports where two unequal spans meet or in case where
the spans are not equally loaded, the ………. of the two values for the negative
moment at the support may he taken for design.

A : Maximum
B : Minimum
C : Addition
D : Average

Average

Q. 80. The very high tensile strength steel cannot be employed in reinforced
concrete construction for which of the following reasons?

A : It will cause wide cracks.
B : It has a lower ductility.
C : It has well defined yield point.
D : Its full strength cannot be utilized.

It has a lower ductility.

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