BDA $20703$

SECTION A

Q$1($a$)$ One end of a U$-$fube manometer in a certain experiment is connected to a reservoir while the other end is connected to a flat zigzag pipe filled with com cooking oll which has a density $)=(922\frac{kg}{m^{\text{'}}}$ as shown in FIGURE Q$1.$ The zigrag pipe is connected to a round container filled with a liquid A which has a densily of $({}_i=800\frac{kg}{m^2}).$ On top of the reservoir, a channel filled with palm oil $)=(915\frac{kg}{m^{\text{'}}}$ was set to have an angle of $55$ from the vertical line. The absolute pressure at point A is measured to be $102736$ Pa $.$ Determine:

$($i$)$ the density of the working fluid $({}_1)$ in the U$-$tube manometer, and $($ii$)$ suggest the name of the working fluid based on your result in $($i$)$