141. If W is weight of a retaining wall and P is the horizontal earth pressure, the factor of safety against sliding, is

A.1

B.1.25

C.1.5

D.2

142. 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

143. If H is the overall height of a retaining wall retaining a surcharge, the width of the base slab usually provided, is

A. 0.3 H

B. 0.4 H

C. 0.5 H

D. 0.6 H

144. The toe projection of foundation slabs is taken

A. as one third of the base

B. as one sixth of overall height of the wall

C. equal to heel slab

D. below ground surface.

145. The thickness of base slab of a retaining wall generally provided, is

A. one half of the width of the stem at the bottom

B. one-third of the width of the stem at the bottom

C. one fourth of the width of the steam at the bottom

D. width of the stem at the bottom

146. The design of heel slab of a retaining wall, is based on the maximum bending moment due to :

A. its own weight

B. weight of the soil above it,

C. load of the surcharge, if any

D. all the above.

147. Pick up the incorrect statement from the following :

A. In the stem of a retaining wall, reinforcement is provided near the earth side

B. In the toe slab of a retaining wall, rein forcement is provided at the bottom of the slab

C. In the heel slab of a retaining wall, rein forcement is provided at the top of the slab

D. None of these.

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