RCC Sheet 19

1) Question.

In a cantilever retaining wall, the bending moment in the vertical stem varies as
Answer.
- 1
  
  h
- 2
  
  $h^{2}$
- 3
  
  $h^{3}$
- 4
  
  $h^{4}$
Answer: 3

Explanation:
Where h = Height of the stem
2) Question.

The heel slab of a retaining wall is reinforced at the ................. of the slab
Answer.
- 1
  
  bottom face
- 2
  
  top face
- 3
  
  middle
Answer: 2

Explanation:
3) Question.

The factor of safety due to sliding of the retaining wall is generally taken as
Answer.
- 1
  
  1
- 2
  
  1.5
- 3
  
  2
- 4
  
  4
Answer: 2

Explanation:
4) Question.

The factor of safety due to overturning of the retaining wall is generally taken as
Answer.
- 1
  
  2
- 2
  
  4
- 3
  
  6
- 4
  
  8
Answer: 1

Explanation:
5) Question.

In a reinforced concrete retaining wall, a shear key is provided, if the
Answer.
- 1
  
  shear stress in the vertical stream is excessive
- 2
  
  shear force in the toe slab is more than that in the heel slab
- 3
  
  retaining wall is not safe against sliding
- 4
  
  retaining wall is not safe against over turning
Answer: 3

Explanation:
6) Question.

In the design of a masonry retaining wall, the
Answer.
- 1
  
  vartical load should fall within the middle-third of base width
- 2
  
  horizontal thrust should act at h/3 from base
- 3
  
  resultant load should fall within a distance of one- sixth of base width on either side of its mid point
- 4
  
  resultant load should fall within a distance of one-eight of base width on either side of ots mid point
Answer: 3

Explanation:
7) Question.

A buttress in a wall is intended to provide
Answer.
- 1
  
  lateral support to roof slab only
- 2
  
  lateral support to wall
- 3
  
  to resist vertical loads only
- 4
  
  lateral support to roof beams only
Answer: 2

Explanation:
8) Question.

When the retaining wall has a sloping backfill with surcharge angel $β$ , then the intensity of earth pressure ( $p_{a}$ ) at the base of the retaining wall height H, is given by
Answer.
- 1
  
  $p_{a} = w H \sin β x \frac{\sin β - \sqrt{\sin^{2} β - \sin^{2} ϕ}}{\sin β + \sqrt{\sin^{2} β - \sin^{2} ϕ}}$
- 2
  
  $p_{a} = w H \cos β x \frac{\cos β - \sqrt{\cos^{2} β - \cos^{2} ϕ}}{\cos β + \sqrt{\cos^{2} β - \cos^{2} ϕ}}$
- 3
  
  $p_{a} = w H \tan β x \frac{\tan β - \sqrt{\tan^{2} β - \tan^{2} ϕ}}{\tan β + \sqrt{\tan^{2} β - \tan^{2} ϕ}}$
- 4
  
  none of the above
Answer: 2

Explanation:
9) Question.

The overturning moment, due to active earth pressure, at toe of the retaining wall is
Answer.
- 1
  
  $\frac{w H^{3}}{2} (\frac{1 - \sin ϕ}{1 + \sin ϕ})$
- 2
  
  $\frac{w H^{3}}{4} (\frac{1 - \sin ϕ}{1 + \sin ϕ})$
- 3
  
  $\frac{w H^{3}}{6} (\frac{1 - \sin ϕ}{1 + \sin ϕ})$
- 4
  
  $\frac{w H^{3}}{8} (\frac{1 - \sin ϕ}{1 + \sin ϕ})$
Answer: 3

Explanation:
10) Question.

If the surcharge is horizontal and carries a surcharge of intensity $w_{1}$ per unit area, then the pressure intensity ( $p_{a}$ ) at the base of the retaining wall of height H is given by
Answer.
- 1
  
  $p_{a} = w H (\frac{1 + \cos ϕ}{1 - \sin ϕ}) + w_{1} (\frac{1 + \cos ϕ}{1 - \sin ϕ})$
- 2
  
  $p_{a} = w H (\frac{1 - \sin ϕ}{1 + \sin ϕ}) + w_{1} (\frac{1 - \sin ϕ}{1 + \sin ϕ})$
- 3
  
  $p_{a} = w H (\frac{1 - \sin ϕ}{1 + \cos ϕ}) + w_{1} (\frac{1 - \sin ϕ}{1 + \cos ϕ})$
- 4
  
  $p_{a} = w H (\frac{1 + \cos ϕ}{1 - \cos ϕ}) + w_{1} (\frac{1 + \cos ϕ}{1 - \cos ϕ})$
Answer: 2

Explanation:

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