29. Why the dam of water reservoir is thick at the bottom

(a)  Quantity of water increases with depth

(b)   Density of water increases with depth

(c)   Pressure of water increases with depth

(d)   Temperature of water increases with depth

Explanation-

(c) A torque is acting on the wall of the dam trying to make it topple. The bottom is made very broad so that the dam will be stable.

(7)