A $25mm$ siphon $(k=0\mathrm{.}0015mm)$ is $20m$ long and is used to draw water from a tank

and dicharge it into the air as shown in $($Click on the diagram:OT$2,$ network $4).$ The

discharge in the siphon is $7\mathrm{.}5\frac{l}{s}$ while the length of the siphon from the intake point

to the summit $(S)$ is only one$-$quarter of the total length. If all minor losses are

neglected, what do you think is the approximate pressure at the summit of the

siphon? Select ONE.