Discussion
Siphon will fail to work if:
Answer: B
A siphon fails if the liquid levels in the two vessels are the same.
The flow is driven by the difference in height between the two surfaces, giving a pressure difference \(\rho g h\). With \(h = 0\) there is nothing to drive the flow. A siphon also fails in a vacuum, since atmospheric pressure is what pushes the liquid up the short limb.
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