SDD - III Practice Test Unit 4

The Minimum factor of safety against sliding to a<br />retaining wall is

• 1
• 1.55
• 2
• 3

The minimum factor of safety again overturning for a<br />retaining wall is

• 3
• 2
• 1.5
• 1

Normally counter forts in a retaining wall are spaced at<br />an interval of

• 1.5 m to 2.5 m
• 2.5 m to 3.5 m
• 3.5 m to 4.5 m
• 4.5 to 5.5 m

The minimum percentage of mild steel reinforcement to<br />be provided in any direction in a retaining wall as

• 0.12
• 1.5
• 0.2
• 0.22

In a cantilever retaining wall of height H the horizontal<br />pressure of earth will act at an distance of

• H\3 from the<br />top
• H\3 from the<br />base
• H\2 from the top
• H\4 from the base

The maximum spacing of the reinforcement being<br />provided in a retaining wall is

• 100 mm
• 250 mm
• 450 mm
• 600 mm

The minimum thickness of stem at the top in a cantilever<br />retaining wall should be

• 100 mm
• 150 mm
• 200 mm
• 300 mm

Bending moment in vertical stem and heel slab at centre<br />(in between counterforts) is taken as

• wl²/10
• wl²/12
• wl²/9
• wl²/8

In a cantilever retaining wall with the horizontal back fill<br />the earth pressure exerted by the soil can be calculated by

• wh²/2 sin Φ
• wh²/2 (1-sin Φ<br />/1+sin Φ)
• wh²/2 (1+sin Φ /1-sin Φ)
• wh²/2 (1+sin Φ /1- sin Φ)²

Bending moment in vertical stem and heel slab at centre (in between counterforts) is taken as

• wl²/8
• wl²/10
• wl²/12
• wl²/16