![Three soil specimens (Soil 1, Soil 2 and Soil 3), each 150 mm long and 100 mm diameter, are placed in series in a constant head flow](https://www.gkseries.com/blog/wp-content/uploads/2023/09/Three-soil-specimens-Soil-1-Soil-2-and-Soil-3-each-150-mm-long-and-100-mm-diameter.jpg)
Q. Three soil specimens (Soil 1, Soil 2 and Soil 3), each 150 mm long and 100 mm diameter, are placed in series in a constant head flow set-up as shown in the figure. Suitable screens are provided at the boundaries of the specimens to keep them intact. The values of coefficient of permeability of Soil 1, Soil 2 and Soil 3 are 0.01, 0.003 and 0.03 cm/s, respectively.
![](https://www.gkseries.com/blog/wp-content/uploads/2023/09/Screenshot-941.png)
The value of h in the set-up is
(A) 0 mm
(B) 40 mm
(C) 255 mm
(D) 560 mm
Ans: 40 mm