148. In case the factor of safety against sliding is less than 1.5, a portion of slab is constructed downwards at the end of the heel slab, which is known as
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149. The stem of a cantilever retaining wall which retains earth level with top is 6 m. If the angle of repose and weight of the soil per cubic metre are 30? and 2000 kg respectively, the effective width of the stem at the bottom, is
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150. In a cantilever retaining wall without a heel slab
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151. The horizontal portion of a step in a stairs case, is known as
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152. A very comfortable type of stairs is
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153. If T and R are tread and rise respectively of a stair, then
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154. The minimum head room over a stair must be
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