Figures below show water flowing through a horizontal pipe from left to right. Note that the pipe in the middle is narrower. Choose the most appropriate depiction of water levels in the vertical pipes.
KVPY 2018, Medium
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$(a)$ By Bernoulli's equation for streamline flow,
$p+\frac{1}{2} \rho v^{2}+\rho g h=\text { a constant }$
In given situation $h=$ constant
$\therefore \quad p+\frac{1}{2} \rho v^{2}=$ constant
When velocity of flow in narrow section increases, pressure decreases.
So, current level in vertical tubes is as shown below.
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