61.
For a single point load W moving on a symmetrical three hinged parabolic arch of span L, the maximum sagging moment occurs at a distance x from ends. The value of x is

63.
Pick up the correct statement applicable to cased columns.

64.
In column analogy method, the area of an analogous column for a fixed beam of span L and flexural rigidity E$$I$$ is taken as

65.
For under water concreting.