# 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/cm

^{2}

- (B) 200
kg/cm

^{2}

- (C) 300 kg/cm

^{2}

- (D) 400 kg/cm

^{2}

**7. If**

*p*_{1}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 φ, the lateral intensity of pressure*p*_{2}is- (A)

*wh*(1 -

*cos*

*φ*)/(1 +

*sin φ*)

- (B)

*wh*(1 -

*sin*

*φ*)/(1 +

*sin φ*)

- (C)

*wh*(1 -

*tan*

*φ*)/(1 +

*tan φ*)

- (D)

*w*(1 -

*cos*

*φ*)/

*h*(1 +

*sin φ*)

**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/cm

^{2}

- (B) 7.6
kg/cm

^{2}

- (C) 21.5 kg/cm

^{2}

- (D) 11.4 kg/cm

^{2}

**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/m^{2}, the modular ratio is- (A) 2800/

*C*

- (B) 2300/2

*C*

- (C) 2800/3

*C*

- (D) 2800/

*C*

^{2}

**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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