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 5 of 19
- A. zero
- B. maximum
- C. variable
- D. infinite
Explanation: Terminal velocity is constant speed achieved by an object falling through a fluid (like air) when the force of gravity pulling it down is…
Correct answer: zero- A. turbulent
- B. along random path
- C. along straight line
- D. streamline
Explanation: In ideal conditions, the fluid moves in smooth, orderly paths without turbulence or random motions.
Correct answer: streamline- A. ↓ and 3cm3 /s
- B. ↑ and 7cm3 /s
- C. ↑ and 11cm3 /s
- D. ↓ and 15cm3 /s
Explanation: The sum of flow rates moving inwards is 6+3+5+4= 18 cm3 /sFlow rates moving outwards=3 cm3 /sNet flow rate=15 cm3 /sThe direction of flow…
Correct answer: ↓ and 15cm3 /s- A. velocity of the fluid is constant
- B. flow of the fluid is along straight line
- C. density of the fluid is constant
- D. In these fluids, the density remains the same no matter the pressure or temperature changes, unlike compressible fluids whose density can alter with these variations
Explanation: In these fluids, the density remains the same no matter the pressure or temperature changes, unlike compressible fluids whose density can…
Correct answer: density of the fluid is constant85. An ideal fluid flows through horizontal tube of variable diameter. The pressure is lowest where the
- A. velocity is highest
- B. diameter is smallest
- C. diameter is largest
- D. both a and b
Explanation: According to Venturi relation "Where speed is high pressure will be low"So, option a) is correct.
Correct answer: both a and b- A. flow rate
- B. volume of fluid
- C. mass of fluid
- D. density of fluid
Explanation: Av= A(s/t)=V/t ∵A=area , v=velocity, V=volume, t=timeThe V/t is the rate of change of volume and is also called as flow rate
Correct answer: flow rate- A. mass
- B. energy
- C. momentum
- D. all
Explanation: The equation of continuity is given by A2v1= A2v2 = constantThe equation of continuity described by the principle that mass is conserved…
Correct answer: mass- A. flow of liquids
- B. viscosity
- C. surface tension
- D. all of these
Explanation: Bernoulli's equation applies specifically to the flow of liquids, describing how pressure, velocity, and elevation are related in a…
Correct answer: flow of liquids- A. Bernoulli's theorem
- B. Torricelli's theorem
- C. venture relation
- D. stoke's law
Explanation: Torricelli's theorem links the speed of eflux out of a container's bottom to the liquid's height above the opening.
Correct answer: Torricelli's theorem- A. 16m/s
- B. 32m/s
- C. 4.0m/s
- D. 2.0m/s
Explanation: According to equation if continuity A2v1= A2v2∵Where d is greater area will also be greater and velocity will be low and vice…
Correct answer: 2.0m/s- A. standing straight
- B. sitting on chair
- C. sitting on the ground
- D. lying horizontally
Explanation: In this position, the heart doesn't need to work as hard against gravity to pump blood, resulting in a lower maximum blood pressure…
Correct answer: lying horizontally- A. 4:6
- B. 4:9
- C. 2:9
- D. 4:3
Explanation: The formula for terminal velocity is vt= 2gr2 ρ/9ηSince the terminal velocity vt is proportional to the square of the radius ( r2 ) the…
Correct answer: 4:9- A. fluid pressure
- B. fluid density
- C. fluid speed
- D. fluid energy
Explanation: A Venturi meter is used to measure the fluid speed or flow velocity within a pipe.
Correct answer: fluid speed- A. is 24m/s
- B. is 2.5 m/s
- C. is 44 m/s
- D. cannot be calculated unless the areas of the hole and tank are given
Explanation: Torricelli's theorem links the speed of eflux out of a container's bottom. It is given as v= √2ghv=√2(9.8)(30)= 24m/s
Correct answer: is 24m/s- A. rough
- B. square
- C. spherical
- D. all of these
Explanation: Stoke's law is primarily applicable to objects that have a spherical shape.
Correct answer: spherical- A. density of liquid
- B. height of liquid above the orifice
- C. gravity
- D. both b and c
Explanation: Torricelli's theorem links the speed of eflux out of a container's bottom.
Correct answer: both b and c- A. lower blood pressure
- B. higher blood pressure
- C. normal blood pressure
- D. abnormal blood pressure
Explanation: Systolic pressure refers to the higher blood pressure recorded in the arteries when the heart contracts and pumps blood into the…
Correct answer: higher blood pressure- A. venturi meter
- B. blood pressure
- C. sphygmomanometer
- D. sonometer
Explanation: A device used to measure blood pressure is called a sphygmomanometer
Correct answer: sphygmomanometer- A. Bernoulli's theorem
- B. Torricelli's theorem
- C. venture relation
- D. stoke's law
Explanation: Venturi relation is stated as "Where speed is high pressure will be low"
Correct answer: venture relation100. Ideal fluid is
- A. non-viscous
- B. incompressible
- C. steady flow
- D. possess all properties
Explanation: The properties of an ideal fluid are: Incompressibility Non-viscous Irrotational Flow Steady and Inviscid
Correct answer: possess all properties