4. To have pressure wholly compressive under the base of a retaining wall of width b, the resultant of the weight of the wall and the pressure exerted by the retained, earth should have eccentricity not more than
5. In a prestressed beam carrying an external load W with a bent tendon is having angle of inclination ? and prestressed load P. The net downward load at the centre is
10. If R and T are rise and tread of a stair spanning horizontally, the steps are supported by a wall on one side and by a stringer beam on the other side, the steps are designed as beams of width
