For the following questions answer them individually
A retaining wall of trapezoidal section having base which ‘b’ retains earth at its back. For no tension to be developed at base, the resultant force will intersect the base from
centre line of the line, within a distance of
The equivalent stiffness of two springs of stiffness $$S_{1} and S_{2}$$ joined in sereies is given by S =
The grade of concrete M 20 means that characteristic compressive strength of 15 cm cubes after 28 days is given by