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WorksheetsSDD - III Practice Test Unit 4
Total questions: 42
Worksheet time: 42mins
Name
Class
Date
1.
The Minimum factor of safety against sliding to a<br />retaining wall is
a)
1
b)
1.55
c)
2
d)
3
2.
The minimum factor of safety again overturning for a<br />retaining wall is
a)
3
b)
2
c)
1.5
d)
1
3.
Normally counter forts in a retaining wall are spaced at<br />an interval of
a)
1.5 m to 2.5 m
b)
2.5 m to 3.5 m
c)
3.5 m to 4.5 m
d)
4.5 to 5.5 m
4.
The minimum percentage of mild steel reinforcement to<br />be provided in any direction in a retaining wall as
a)
0.12
b)
1.5
c)
0.2
d)
0.22
5.
In a cantilever retaining wall of height H the horizontal<br />pressure of earth will act at an distance of
a)
H\3 from the<br />top
b)
H\3 from the<br />base
c)
H\2 from the top
d)
H\4 from the base
6.
The maximum spacing of the reinforcement being<br />provided in a retaining wall is
a)
100 mm
b)
250 mm
c)
450 mm
d)
600 mm
7.
The minimum thickness of stem at the top in a cantilever<br />retaining wall should be
a)
100 mm
b)
150 mm
c)
200 mm
d)
300 mm
8.
Bending moment in vertical stem and heel slab at centre<br />(in between counterforts) is taken as
a)
wl²/10
b)
wl²/12
c)
wl²/9
d)
wl²/8
9.
In a cantilever retaining wall with the horizontal back fill<br />the earth pressure exerted by the soil can be calculated by
a)
wh²/2 sin Φ
b)
wh²/2 (1-sin Φ<br />/1+sin Φ)
c)
wh²/2 (1+sin Φ /1-sin Φ)
d)
wh²/2 (1+sin Φ /1- sin Φ)²
10.
Bending moment in vertical stem and heel slab at centre (in between counterforts) is taken as
a)
wl²/8
b)
wl²/10
c)
wl²/12
d)
wl²/16
11.
In a reinforced concrete retaining wall, a shear key is provided. If the
a)
Shear stress in the vertical stem is<br />excessive.
b)
Shear force in the toe slab is more than that<br />in the heel slab
c)
Retaining wall is not safe against sliding
d)
Retaining wall is not safe against overturning.
12.
How is the base-level bending moment of a cantilever<br />retaining wall expressed as a function of its height H?
a)
H
b)
H^2
c)
H^3
d)
H^4
13.
In a cantilever retaining wall, the main steel reinforcement is provided
a)
On the backfill side, in the vertical<br />direction
b)
On both, inner and outer, faces
c)
In horizontal as well as in vertical directions
d)
To counteract shear stresses
14.
In the design of a masonry retaining wall, the
a)
Vertical load should fall within the middle third of base width
b)
Horizontal thrust should act at h/3 from base.
c)
Resultant load should fall within a distance of one-sixth of base width on either side of its midpoint.
d)
Resultant load should fall within a distance of one- either of base width on either side of its midpoint
15.
Which of the following are the general design
a)
1, 2 and 3 only
b)
1, 3 and 4 only
c)
1, 2 and 4 only
d)
2, 3 and 4
16.
A buttress in a wall is intended to provide
a)
Lateral support to roof slab<br />only
b)
Lateral support to wall
c)
To resist vertical loads only
d)
Lateral support to roof beams only
17.
Consider the following statements: The main<br />reinforcement in the counter fort in a counter fort
a)
1 and 2
b)
2 and 3
c)
3 and 4
d)
2 and 4
18.
The pressure exerted by the retained material on the retaining wall is called
a)
Active earth pressure
b)
Earth pressure
c)
Passive earth pressure
d)
Both (a) and (b)
19.
A retaining wall which resist the earth pressure due to backfill by its dead weight is called
a)
Cantilever retaining wall
b)
Gravity wall
c)
Counterfort retaining wall
d)
Buttress retaining wall
20.
Cantilever RC retaining wall proves to be economical for height
a)
5m to 7m
b)
8m to 10m
c)
11 m to 15m
d)
More than 15m
21.
Let H= height of retaining wall, ϒ=unit weight of backfill and ka = coefficient of active earth pressure, kp = coefficient of passive earth pressure, then the intensity of active earth pressure per unit area of wall at any depth ‘h’ below top of the wall is given by
a)
Pa = ka ϒ h
b)
Pa = kp ϒ h
c)
Pa = ka ϒ h2 /2
d)
Pa = ka ϒ h3 /6
22.
Let H= height of retaining wall, ϒ=unit weight of backfill and ka = coefficient of active earth pressure, kp = coefficient of passive earth pressure, then total pressure at any height ‘h’ below top of the wall is given by
a)
Pa = ka ϒ h
b)
Pa = kp ϒ h
c)
Pa = ka ϒ h2 /2
d)
Pa = ka ϒ h3 /6
23.
Let H= height of retaining wall, ϒ=unit weight of backfill and ka = coefficient of active earth pressure, kp = coefficient of passive earth pressure, then bending moment at any height ‘h’ below top of the wall is given by
a)
Pa = ka ϒ h
b)
Pa = kp ϒ h
c)
Pa = ka ϒ h2 /2
d)
Pa = ka ϒ h3 /6
24.
Coefficient of active earth pressure ka
a)
ka = 1-sinϕ / 1+sinϕ
b)
ka = 1-sin2ϕ / 1+sin2ϕ
c)
ka = 1+sinϕ / 1-sinϕ
d)
ka = 1+sin2ϕ / 1-sin2ϕ
25.
Coefficient of passive earth pressure kp
a)
Kp = 1-sinϕ / 1+sinϕ
b)
Kp = 1-sin2ϕ / 1+sin2ϕ
c)
Kp = 1+sinϕ / 1-sinϕ
d)
Kp = 1+sin2ϕ / 1-sin2ϕ
26.
The relation between ka = coefficient of active earth pressure and kp = coefficient of passive earth pressure is
a)
kp =3 x ka
b)
ka =3 x kp
c)
kp =9 x ka
d)
ka =9 x kp
27.
The vertical stem of cantilever retaining wall is subjected to
a)
Varying earth pressure developing tensile stresses on earth side
b)
Varying earth pressure developing tensile stresses on opposite side of earth side
c)
Varying large upward soil pressure
d)
Downward force due to self-weight of slab
28.
The heel slab of cantilever retaining wall is subjected to<br />1. Varying earth pressure developing tensile stresses on earth side<br />2. Downward force due to weight of earth above the heel slab<br />3. Downward force of self-weight of slab<br />4. Upward soil pressure
a)
1 ,2 and 3
b)
Only 2 and 3
c)
Only 1 and 3
d)
2, 3 and 4
29.
The toe slab of cantilever retaining wall is subjected to<br />1) Varying large Upward soil pressure<br />2) Downward force due to weight of earth above the heel slab<br />3) Downward force of self-weight of slab
a)
1 ,2 and 3
b)
Only 2 and 3
c)
Only 1 and 3
d)
2, 3 and 4
30.
To stabilize a concrete cantilever retaining wall against sliding, the ratio of sliding force to resisting force should be
a)
≥ 1.55
b)
≤ 1.55
c)
≥ 1.0
d)
≤ 0.645
31.
To stabilize a concrete cantilever retaining wall against sliding, the ratio of resisting force to sliding force should be
a)
≥ 1.55
b)
≤ 1.55
c)
≥ 1.0
d)
≤ 0.645
32.
In retaining wall to prevent the sliding of wall sometimes
a)
Shear key is provided
b)
Bending key is provided
c)
Ankle key is provided
d)
Bearings are provided
33.
If the angle of repose is 31º the coefficient of active earth pressure is
a)
0.29
b)
0.32
c)
0.3
d)
0.22
34.
The temperature and shrinkage reinforcement provided in retaining wall for mild steel
a)
0.12% of gross sectional area
b)
0.15% of gross sectional area
c)
0.51% of gross sectional area
d)
0.21% of gross sectional area
35.
The temperature and shrinkage reinforcement provided in retaining wall for HYSD reinforcement is
a)
0.12% of gross sectional area
b)
0.15% of gross sectional area
c)
0.51% of gross sectional area
d)
0.21% of gross sectional area
36.
For stability of retaining wall against retaining wall the factor of safety against overturning
a)
Should not less than 1.55
b)
Should not more than 1.55
c)
Should not less than 1.00
d)
1
37.
If embankment is sloping at an angle of 18º to the horizontal, the coefficient of active earth pressure is
a)
0.3
b)
0.36
c)
3.6
d)
3
38.
If angle of repose is 30º then Coefficient of active earth pressure ka
a)
3
b)
9
c)
1/3
d)
1/9
39.
If angle of repose is 30º then Coefficient of passive earth pressure kp
a)
3
b)
9
c)
1/3
d)
1/9
40.
The maximum permissible eccentricity of a retaining wall of width B to avoid failure in tension is
a)
B/2
b)
B/3
c)
B/6
d)
B/12
41.
Let height of retaining wall is 5.1m, ϒ=unit weight of backfill is 18kN/m3 and ka = coefficient of active earth pressure is 0.32, then total pressure at height 5.1m below top of the wall is given by
a)
74.90 kN
b)
79.40 kN
c)
94.70 kN
d)
97.40 kN
42.
Let height of retaining wall is 5.1m, ϒ=unit weight of backfill is 18kN/m3 and ka = coefficient of active earth pressure is 0.32, then bending moment at height 5.1m below top of the wall is given by
a)
123.74 kNm
b)
137.24 kNm
c)
127.34 kNm
d)
124.73 kNm
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