# Practice Test: Question Set - 11

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

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

3. The angle of repose of a soil is the maximum angle which the outer face of the soil mass makes
(A) With the horizontal
(B) With the vertical
(C) With the perpendicular to the inclined plane of the soil
(D) None of these

4. 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, the following relationship holds good
(A) mc/t = n/(d - n)
(B) (m + c)/t = n/(d + n)
(C) (t + c)/n = (d + n)/n
(D) mc/t = (d - n)/t

5. A raft foundation is provided if its area exceeds the plan area of the building by
(A) 10 %
(B) 20 %
(C) 40 %
(D) 50 %

6. In favourable circumstances a 15 cm concrete cube after 28 days, attains a maximum crushing strength
(A) 100 kg/cm2
(B) 200 kg/cm2
(C) 300 kg/cm2
(D) 400 kg/cm2

7. If p1 is the vertical intensity of pressure at a depth h on a block of earth weighing w per unit volume and the angle of repose Ï†, the lateral intensity of pressure p2 is
(A) wh (1 - cos Ï†)/(1 + sin Ï†)
(B) wh (1 - sin Ï†)/(1 + sin Ï†)
(C) wh (1 - tan Ï†)/(1 + tan Ï†)
(D) w (1 - cos Ï†)/h (1 + sin Ï†)

8. 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) Distance of the C.G. of the area from its neutral axis
(D) Moment of the beam section about its neutral axis

9. According to I.S.: 456, 1978 the thickness of reinforced concrete footing on piles at its edges, is kept less than
(A) 20 cm
(B) 30 cm
(C) 40 cm
(D) 75 cm

10. An R.C.C. beam of 25 cm width and 50 cm effective depth has a clear span of 6 meters and carries a U.D.L. of 3000 kg/m inclusive of its self weight. If the lever arm constant for the section is 0.865, the maximum intensity of shear stress, is
(A) 8.3 kg/cm2
(B) 7.6 kg/cm2
(C) 21.5 kg/cm2
(D) 11.4 kg/cm2

11. The percentage of minimum reinforcement of the gross sectional area in slabs, is
(A) 0.10 %
(B) 0.12 %
(C) 0.15 %
(D) 0.18 %

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

13. 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°

14. Cantilever retaining walls can safely be used for a height not more than
(A) 3 m
(B) 4 m
(C) 5 m
(D) 6 m

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

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