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9.1 , fluid mechanics — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysics9.1 , fluid mechanics1 Mark
MCQ
Figure shows a siphon. Choose the wrong statement:

($P_0$ = atmospheric pressure)

  • A
    Siphon works when $h_3 > 0$
  • B
    Pressure at point $2$ is $P_2 = P_0 - \rho gh_3$
  • C
    Pressure at point $3$ is $P_0$
  • ✓
    None of the above 
✓

Answer

Correct option: D.
None of the above 
d
By Bernoulli equation

$\mathrm{P}_{0}+\rho \mathrm{gh}_{3}=\mathrm{P}_{0}+1 / 2 \rho \mathrm{v}^{2}$

$1 / 2 \rho v^{2}=\rho g h_{3}$

$\mathrm{P}_{0}=\mathrm{P}_{2}+1 / 2 \rho \mathrm{v}^{2}$

$\mathrm{P}_{2}=\mathrm{P}_{0}-\rho \mathrm{gh}_{3}$

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