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MDCAT Physics QUESTION #4386
Question 1
A fluid is flowing through a tube. To undergo transition from laminar to turbulent flow, its velocity must be:
  • Slightly less than critical velocity
  • Equal to critical velocity
  • Greater than critical velocity✔️
  • Increasing gradually but less than critical velocity
Correct Answer Explanation
Flow transitions from laminar to turbulent when the Reynolds number $Re = \dfrac{\rho v d}{\eta}$ exceeds a critical value. This occurs when fluid velocity exceeds the critical velocity.