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Fluid Dynamics MCQs for MDCAT Practice

Physics section, Fluid Dynamics chapter. Up to eight free sample questions, each with the correct answer and a worked explanation. The full chapter opens in the app.

The bank has 382 active questions on this chapter. Your first 500 practice attempts are free, and every attempt includes a worked explanation.

  1. Question 1
    Laminar flow is characterized by?
    • A: Regular flow
    • B: Steady flow
    • C: Noiseless
    • D: All of the above (correct answer)
    Correct answer: D
    Laminar flow is a smooth, orderly fluid motion characterized by regular, steady, and often quiet movement, contrasting with turbulent flow.
  2. Question 2
    Two meter high tank is full of water, a hole is made in the middle of the tank. The speed of efflux is
    • 4.9 m/s
    • 9.8 m/s
    • 4.42 m/s (correct answer)
    • 3.75 m/s
    Correct answer: C
    This question tests Torricelli's Law, which relates the speed of fluid efflux from a tank to the height of the fluid above the hole. It's crucial to use the correct height in the formula.
  3. Question 3
    For a very fast moving object, drag force and velocity have the following relation:
    • Not related in anyway
    • Direct
    • None of the above
    • Inverse (correct answer)
    Correct answer: D
    Drag force on fast-moving objects is inversely proportional to velocity, meaning higher speeds result in lower drag.
  4. Question 4
    Air is streaming past a horizontal air plane wing such that its speed in 120 m/s over the upper surface and 90 m/s at the lower surface. If the density of air is 1.3 kg per metre3 and the wing is 10 m long and has an average width of 2m, then the difference of the pressure on the two sides of the wing of :
    • 4095.0 Pascal (correct answer)
    • 409.50 Pascal
    • 40.950 Pascal
    • 4.0950 Pascal
    Correct answer: A
    This question tests Bernoulli's principle to calculate the pressure difference across an airplane wing due to varying air speeds, a key concept in fluid dynamics.
  5. Question 5
    The dimensions of pressure is:
    • [M-1L2T-2]
    • [ML-1T]
    • [M-1L-2T-2]
    • [ML-1T-2] (correct answer)
    Correct answer: D
    This question tests your ability to derive the dimensional formula of pressure from its definition and fundamental units.
  6. Question 6
    A two-meter-high tank is full of water. A hole is made in the middle of the tank. The speed of efflux is:
    • 4.9ms-1
    • 9.8ms-1
    • 4.42ms-1 (correct answer)
    • 3.75ms-1
    Correct answer: C
    Torricelli's Law relates efflux speed to the depth of fluid above the hole, not the total tank height.
  7. Question 7
    The terminal velocity of eight droplets having same mass and size is Vt, when they are mixed together to form a single drop, their combined terminal velocity is
    • 4Vt (correct answer)
    • 2Vt
    • 8Vt
    • Vt
    Correct answer: A
    Terminal velocity of droplets scales with the square root of their radius, meaning combining droplets significantly increases their terminal velocity due to volume-to-surface area changes.
  8. Question 8
    A fluid flows steadily through a pipe and small disturbances begin to appear in the flow pattern. Which statement is most appropriate?
    • Flow must be fully turbulent
    • Flow is still laminar
    • Flow is in a transition stage (correct answer)
    • Flow is independent of viscosity
    Correct answer: C
    Fluid flow transitions from smooth laminar to chaotic turbulent. Small disturbances indicate the intermediate "transition stage" where both behaviors can coexist.

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