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9.1 , fluid mechanics — Physics STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 SciencePhysics9.1 , fluid mechanics1 Mark
MCQ
Water containing air bubbles flows without turbulence through a horizontal pipe which has a region of narrow cross-section. In this region, the bubbles
  • A
    move with greater speed and are smaller in size than in the rest of the pipe
  • ✓
    move with greater speed and are larger in size than in the rest of the pipe
  • C
    move with lesser speed and are smaller in size than in the rest of the pipe
  • D
    move with lesser speed and are of the same size as in the rest of the pipe
✓

Answer

Correct option: B.
move with greater speed and are larger in size than in the rest of the pipe
b
(b)

In narrow region, velocity of flow is more.

$v \propto \frac{1}{\text { Area }}$

As a result, pressure in narrow region is less.

As, $p+\frac{1}{2} \rho v^2=$ constant for a horizontal tube.

So, bubbles grow in size and they move fast through narrow region.

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