When the area to be enclosed is large, it becomes essential to provide the _________ construction so as to give stability to the cofferdam.

Cellular cofferdam

Double wall cofferdam

Suspended cofferdam

Single wall cofferdam

Correct Answer : Double wall cofferdam

Explanation : Double wall cofferdam was frequently used on the river Ohio in USA and hence, it derives its name as Ohio river type cofferdam. It is cheap and can be built up rapidly l. It is suitable for hard bed where there is no problem of erosion. This type of cofferdam is unsuitable for deep water.

Recently Updated in Building Materials Questions

The proportions of charcoal, saltpetre and sulphur in gun powder by weight, are respectively :

75, 10, 15

10, 15, 75

15, 75, 10

10, 75, 15.

Correct Answer : Option (C) : 15, 75, 10

A 1st class brick immersed in water for 24 hours, should not absorb water (by weight) more than ____

10%

15%

20%

25%