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MDCAT Physics QUESTION #4406
Question 1
An incompressible fluid flows through a pipe that becomes narrower in one section. The fluid speed increases in that region to maintain:
  • Constant pressure
  • Constant energy
  • Constant mass flow rate✔️
  • Constant volume
Correct Answer Explanation
By the equation of continuity: $A_1v_1 = A_2v_2$. For an incompressible fluid, the volume flow rate (and hence mass flow rate) must remain constant. When area decreases, velocity increases to maintain $\dot{m} = \rho Av = $ constant.