# Civil Engineering - RCC Structures Design

### Exercise :: RCC Structures Design - Section 3

21.

A raft foundation is provided if its area exceeds the plan area of the building by

 A. 10% B. 20% C. 30% D. 40% E. 50%

Explanation:

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22.

The Total pressure on the vertical face of a retaining wall of height h exerted by the retained earth weighing w per unit volume having an angle of surcharge α°, is :

 A. B. C. D.

Explanation:

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23.

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 E. 0.7 H

Explanation:

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24.

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

 A. 51.5 B. 52.5 C. 53.5 D. 54.5 E. 55.5

Explanation:

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25.

If depth of slab is 10 cm, width of web 30 cm, depth of web 50 cm, centre to centre distance of beams 3 m, effective span of beams 6 m, the effective flange width of the beam, is

 A. 200 cm B. 300 cm C. 150 cm D. 100 cm