RCC Sheet 40

1) Question.

Total pressure on the vertical face of a retaining wall of height h per unit run exerted by the retained earth weighing $ω$ per unit volume, is
Answer.
- 1
  
  $ω h \frac{(1 - s i n ϕ)}{(1 + s i n ϕ)}$
- 2
  
  $ω h^{2} \frac{(1 - s i n ϕ)}{(1 + s i n ϕ)}$
- 3
  
  $\frac{ω h^{2} (1 - s i n ϕ)}{2 (1 + s i n ϕ)}$
- 4
  
  $\frac{ω h^{2} (1 - s i n ϕ)}{3 (1 + s i n ϕ)}$
Answer: 3

Explanation:
2) Question.

If $p_{1}$ is the vertical intensity of pressure at a depth h on a block of earth weighing $ω$ per unit volume and the angle of repose $ϕ$ , the lateral intensity of pressure $p_{2}$ is
Answer.
- 1
  
  $\frac{ω h (1 - \cos θ)}{(1 + \sin θ)}$
- 2
  
  $\frac{ω h (1 - s i n ϕ)}{(1 + s i n ϕ)}$
- 3
  
  $\frac{ω h (1 - \tan ϕ)}{(1 + \tan ϕ)}$
- 4
  
  $\frac{ω h = (1 - s i n ϕ)}{h (1 + s i n ϕ)}$
Answer: 2

Explanation:
3) Question.

If $p_{1}$ and $p_{2}$ are mutually perpendicular principal stresses acting on a soil mass, the normal stress on any plane inclined at angle $θ^{o}$ to the principal plane carrying the principal stress $p_{1}$ , is:
Answer.
- 1
  
  $\frac{p_{1} - p_{2}}{2} + \frac{p_{1} + p_{2}}{2} \sin 2 θ$
- 2
  
  $\frac{p_{1} - p_{2}}{2} + \frac{p_{1} + p_{2}}{2} \cos 2 θ$
- 3
  
  $\frac{p_{1} + p_{2}}{2} + \frac{p_{1} - p_{2}}{2} \cos 2 θ$
- 4
  
  $\frac{p_{1} + p_{2}}{2} + \frac{p_{1} - p_{2}}{2} t a n 2 θ$
Answer: 3

Explanation:
4) Question.

The angle of internal friction of soil mass is the angle whose
Answer.
- 1
  
  tangent is equal to the rate of the maximum resistance to sliding on any internal inclined plane to the normal pressure acting on the plane
- 2
  
  since is equal to the ratio of the maximum resistance to sliding on any internal inclined plane to the normal pressure acting on the plane
- 3
  
  cosine is equal to the ratio of the maximum resistance sliding on any internal inclined plane to the normal pressure acting on the plane
- 4
  
  none of these
Answer: 1

Explanation:
5) Question.

If At is the gross area of steel in tension, d is the effective depth of the beam and $\bar{y}$ is the depth of the centre of gravity of the resultant compression, the moment of resistance M of the beam, is given by
Answer.
- 1
  
  $M = A t (d - \bar{y})$
- 2
  
  $M = A t f (d - \bar{y})$
- 3
  
  $M = A t f (d - \bar{y})$
- 4
  
  none of these
Answer: 3

Explanation:
6) Question.

The angle of repose of a soil is the maximum angle which the outer face of the soil mass makes
Answer.
- 1
  
  with the horizontal
- 2
  
  with the vetical
- 3
  
  with the perpendicular to the inclined plane of the soil
- 4
  
  none of these
Answer: 1

Explanation:
7) Question.

The design of a retaining wall assumes that the retained earth
Answer.
- 1
  
  is dry
- 2
  
  is free from moisture
- 3
  
  is not cohesives
- 4
  
  all the above
Answer: 4

Explanation:
8) Question.

A raft foundation is provided if its area exceeds the plan area of the building by
Answer.
- 1
  
  10%
- 2
  
  20%
- 3
  
  30%
- 4
  
  50%
Answer: 4

Explanation:
9) Question.

In testing a pile by load test, pile platform is loaded with one and half times the design load and a maximum settlement is noted. The load is gradually removed and the con-sequent rebound is measured. For a safe pile, the net settlement(i.e. total settlement minus rebound) per tonne of test load should not exceed
Answer.
- 1
  
  10 mm
- 2
  
  15 mm
- 3
  
  20 mm
- 4
  
  25 mm
Answer: 4

Explanation:
10) Question.

A pile weighing $W_{1}$ kg penetrates S metres with its last blow. If $W_{2}$ is the weight of the hammer having a drop of H metres, the pile can carry a maximum external load
Answer.
- 1
  
  $\frac{W_{1}^{2}}{W_{1} + W_{2}} . \frac{H}{S} + W_{1} k g$
- 2
  
  $\frac{W_{2}^{2}}{W_{1} + W_{2}} . \frac{H}{S} + W_{2} k g$
- 3
  
  $\frac{W_{1}^{2}}{W_{1} - W_{2}} . \frac{H}{S} + W_{1} k g$
- 4
  
  $\frac{W_{2}^{2}}{W_{1} + W_{2}} . \frac{H}{S} + W_{2} k g$
Answer: 2

Explanation:

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