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Fluid Mechanics: Continuity MCQ

Solve this quality-checked JEE multiple-choice question, then review the correct answer and explanation.

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ContinuityMediumQuestion 30926

Question

Water flows through a pipe of diameter 4 cm at 2 m/s. Diameter narrows to 2 cm. New speed is:
  1. A
    1 m/s
  2. B
    4 m/s
  3. C
    8 m/s
    Correct
  4. D
    16 m/s

Correct answer

8 m/s

Explanation

A₁v₁ = A₂v₂. A ∝ d². (4²)×2 = (2²)×v₂ → 32 = 4v₂ → v₂ = 8 m/s.

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