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RCC Structures Design MCQ

1.The maximum shear stress (qmax) in a rectangular beam is

  • A1.25 times the average
  • B1.50 times the average
  • C1.75 times the average
  • D2.0 times the average
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Correct Answer : (B)

1.50 times the average
Explanation:

2.In favourable circumstances a 15 cm concrete cube after 28 days, attains a maximum crushing strength

  • A100 kg/cm²
  • B200 kg/cm²
  • C300 kg/cm²
  • D400 kg/cm²
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Correct Answer : (D)

400 kg/cm²
Explanation:

3.If q is the punching shear resistance per unit area a, is the side of a square footing for a column of side b, carrying a weight W including the weight of the footing, the depth (D) of the footing from punching shear consideration, is

  • AD = W (a - b)/4a²bq
  • BD = W (a² - b²)/4a²bq
  • CD = W (a² - b²)/8a²bq
  • DD = W (a² - b²)/4abq
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Correct Answer : (B)

D = W (a² - b²)/4a²bq
Explanation:

4.The Young's modulus of elasticity of steel, is

  • A150 KN/mm²
  • B200 KN/mm²
  • C250 KN/mm²
  • D275 KN/mm²
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Correct Answer : (D)

275 KN/mm²
Explanation:

5.The section of a reinforced beam where most distant concrete fibre in compression and tension in steel attains permissible stresses simultaneously, is called

  • ABalanced section
  • BEconomic section
  • CCritical section
  • DAll the above
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Correct Answer : (D)

All the above
Explanation:

6.As per IS : 1343, total shrinkage for a pre-tensioned beam, is

  • A3.0 × 10⁻²
  • B3.0 × 10⁻³
  • C3.0 × 10⁻⁵
  • D3.5 × 10⁻⁵
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Correct Answer : (D)

3.5 × 10⁻⁵
Explanation:

7.If d is the diameter of a bar, ft is allowable tensile stress and fb, is allowable bond stress, the bond length is given by

  • Aft .d/4fb
  • B(π/4). (ft .d/fb)
  • Cπ ft .d²/fb
  • D(π/4). (ft .d3/fb)
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Correct Answer : (A)

ft .d/4fb
Explanation:

8.A pre-cast pile generally used, is

  • ACircular
  • BSquare
  • COctagonal
  • DSquare with corners chamfered
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Correct Answer : (D)

Square with corners chamfered
Explanation:

9.The weight of reinforced concrete, is generally taken as

  • A2200 kg/m³
  • B2300 kg/m³
  • C2400 kg/m³
  • D2500 kg/m³
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Correct Answer : (D)

2500 kg/m³
Explanation:

10.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

  • A12 bar diameters
  • B18 bar diameters
  • C24 bar diameters
  • D30 bar diameters
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Correct Answer : (C)

24 bar diameters
Explanation:

11.The system in which high tensile alloy steel bars (silica manganese steel) are used as pre-stressing tendons, is known as

  • AFreyssinet system
  • BMagnel-Blaton system
  • CC.C.L. standard system
  • DLee-McCall system
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Correct Answer : (D)

Lee-McCall system
Explanation:

12.If the effective length of a 32 cm diameter R.C.C. column is 4.40 m, its slenderness ratio, is

  • A40
  • B45
  • C50
  • D55
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Correct Answer : (D)

55
Explanation:

13.Distribution reinforcement in a simply supported slab, is provided to distribute

  • ALoad
  • BTemperature stress
  • CShrinkage stress
  • DAll the above
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Correct Answer : (D)

All the above
Explanation:

14.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

  • AOne-half lever arm of the section
  • BOne-third lever arm of the section
  • CLever arm of the section
  • DOne and half lever arm of the section
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Correct Answer : (C)

Lever arm of the section
Explanation:

15.The diameter of longitudinal bars of a column should never be less than

  • A6 mm
  • B8 mm
  • C10 mm
  • D12 mm
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Correct Answer : (D)

12 mm
Explanation:

16.Design of R.C.C. cantilever beams, is based on the resultant force at

  • AFixed end
  • BFree end
  • CMid span
  • DMid span and fixed support
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Correct Answer : (A)

Fixed end
Explanation:

17.High strength concrete is used in pre-stressed member

  • ATo overcome high bearing stresses developed at the ends
  • BTo overcome bursting stresses at the ends
  • CTo provide high bond stresses
  • DAll the above
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Correct Answer : (D)

All the above
Explanation:

18.According to load factor method, the permissible load ‘W’ on a short column reinforced with longitudinal bars and lateral stirrups, is

  • AStress in concrete × area of concrete
  • BStress in steel × area of steel
  • CStress in concrete × area of concrete + Stress in steel × area of steel
  • DNone of these
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Correct Answer : (C)

Stress in concrete × area of concrete + Stress in steel × area of steel
Explanation:

19.Based on punching shear consideration, the overall depth of a combined footing under a column A, is

  • A(Area of the column A × Safe punching stress)/Load on column A
  • B(Perimeter of column A × Safe punching stress)/(Load on column A + Upward pressure × Area of the column)
  • C(Perimeter of column A × Safe punching stress)/(Load on column A × Upward pressure × Area of the column)
  • DNone of these
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Correct Answer : (B)

(Perimeter of column A × Safe punching stress)/(Load on column A + Upward pressure × Area of the column)
Explanation:

20.If W is the load on a circular slab of radius R, the maximum circumferential moment at the centre of the slab, is

  • AWR²/16
  • B2WR²/16
  • C3WR²/16
  • DZero
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Correct Answer : (C)

3WR²/16
Explanation:

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