Free Fluid Dynamics MCQs with Answers
363 Fluid Dynamics MCQs from Physics, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Fluid flow is described through speed, pressure and density, including steady flow and the equation of continuity for conserving mass. Bernoulli's equation relates pressure, speed and height, while fluid drag and terminal velocity explain why a falling object eventually moves at constant speed when drag balances its weight.
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Read the Fluid Dynamics notesFree MDCAT chapter notes with key terms363 questions · page 6 of 19
- A. low
- B. high
- C. very high
- D. sometime high and sometime low
Explanation: Laminar flow typically occurs at low speeds. This type of flow involves smooth and orderly movement of fluid layers along parallel paths…
Correct answer: low- A. statically
- B. dynamically
- C. sometime static and sometime dynamic
- D. none of these
Explanation: Sphygmomanometers measure blood pressure dynamically by detecting changes in pressure within the arteries as the cuff gradually deflates…
Correct answer: dynamically- A. Venturi meter
- B. Bernoulli's equation
- C. Equation of continuity
- D. Torricelli's theorem
Explanation: The carburetor uses the Venturi effect, which is based on the principles similar to those used in a Venturi meter, to mix air and fuel in…
Correct answer: Venturi meter- A. Drops slightly
- B. rises slightly
- C. rises if the blowing is soft but drops if it is hard
- D. remains at the same height
Explanation: When a person blows across the top of one arm of a U-tube partially filled with water, the water level in that arm actually rises…
Correct answer: rises slightly- A. laminar flow
- B. turbulent flow
- C. static flow
- D. all kinds of flow
Explanation: Bernoulli's theorem is only applicable to smooth flow. So it is only for laminar flow.Laminar flow is characterized by the smooth flow in…
Correct answer: laminar flow- A. convergent duct
- B. divergent duct
- C. at end points
- D. at any point
Explanation: The speed of the fluid in a Venturi meter is maximum at the convergent duct.
Correct answer: convergent duct- A. Torricelli effect
- B. Bernoulli effect
- C. Venture effect
- D. Doppler's effect
Explanation: This phenomenon is a consequence of Bernoulli's principle, which states that as the speed of a fluid increases, its pressure decreases.
Correct answer: Bernoulli effect- A. Increase
- B. Decrease
- C. Remain same
- D. Doubles
Explanation: Viscosity is a measure of a fluid's resistance to flow. In general, as the temperature of a substance increases, its molecular motion and…
Correct answer: Decrease- A. 2V2
- B. V1/2
- C. 2V1
- D. None of these
Explanation: according to equation of continuity, AV= constant, since the area at the entrance is double the area at exit, so it's velocity has to be…
Correct answer: V1/2- A. Velocity increases pressure decreases cases
- B. Velocity and pressure increases
- C. Velocity and pressure decreases
- D. Velocity decreases pressure increases
Explanation: According to the principle of continuity and Bernoulli's equation, in the constricted part of a pipe where the diameter decreases, the…
Correct answer: Velocity decreases pressure increases- A. Turbulent flow
- B. Laminar flow
- C. Streamline and compressible fluid
- D. None
Explanation: Bernoulli's equation is applicable to streamline flow, which is also known as laminar flow, and it is also applicable to compressible…
Correct answer: Streamline and compressible fluid- A. √2gh
- B. gh
- C. 2pgh
- D. √pgh
Explanation: The speed of efflux, or the velocity with which a fluid exits an orifice under the influence of gravity, is given by the Torricelli's…
Correct answer: √2gh- A. Positive
- B. Negative
- C. Zero
- D. Cannot produce
Explanation: When a particle reaches terminal velocity in a fluid, it means that the gravitational force pulling it down is balanced by the drag force…
Correct answer: Zero- A. Velocity of spherical body
- B. Radius
- C. Coefficient of viscosity
- D. All
Explanation: The dragging force, or drag force, experienced by an object moving through a fluid depends on various factors, including the velocity of…
Correct answer: All- A. Decreases
- B. Increases
- C. Remains constant
- D. Cannot predict
Explanation: As the speed of a falling drop increases, its dragging force increases as well.
Correct answer: Increases- A. Increases
- B. Decreases
- C. Remains the same
- D. Zero
Explanation: As the temperature of a gas increases, the viscosity of the gas generally decreases.
Correct answer: Increases- A. radius of the orifice
- B. height of the liquid column
- C. acceleration due to gravity
- D. density of the liquid
Explanation: The rate of outflow of liquid through an orifice depends on factors such as the radius of the orifice, the height of the liquid column…
Correct answer: acceleration due to gravity- A. Torricelli effect
- B. Bernoulli effect
- C. Venture effect
- D. Doppler's effect
Explanation: This phenomenon is a consequence of Bernoulli's principle, which states that as the speed of a fluid increases, its pressure decreases.
Correct answer: Bernoulli effect- A. Increase
- B. Decrease
- C. Remains same
- D. Doubles
Explanation: Viscosity is a measure of a fluid's resistance to flow. In general, as the temperature of a substance increases, its molecular motion and…
Correct answer: Decrease- A. Increase twice
- B. Increase thrice
- C. Increase 4 times
- D. Same
Explanation: The terminal velocity of a droplet is directly proportional to the square of its radius.
Correct answer: Increase 4 times