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Question 30977
JEE Physics · Hard

Fluid Mechanics: Bernoulli's Theorem MCQ

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Bernoulli's TheoremHardQuestion 30977

Question

In a siphon working to drain liquid over a hump, the pressure at the top of the siphon is:
  1. A
    Atmospheric
  2. B
    Higher than atmospheric
  3. C
    Lower than atmospheric
    Correct
  4. D
    Zero

Correct answer

Lower than atmospheric

Explanation

By Bernoulli's equation, as liquid climbs the hump, pressure decreases. At the top, P < P_atm. The siphon works only if this pressure stays above vapour pressure of the liquid.

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