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Mechanical Properties of Fluids — Physics STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 SciencePhysicsMechanical Properties of Fluids1 Mark
MCQ
An incompressible fluid flows steadily through a cylindrical pipe which has radius 2R at point A and Radius R at point B farther along the flow direction. If the velocity at point A is v, its velocity at point B is:
  • A
    2v.
  • B
    v.
  • C
    $\frac{\text{v}}{2}$
  • D
    4v.
✓

Answer

  1. 4v.

Explanation:

From equation of continuity.

$\pi(2\text{R})^2\text{v}=\pi\text{r}^2\times\text{v}\text{ or }\text{v}_1=4\text{v}$

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