Which of the following statements regarding Fluid Mechanics is FALSE: (a) For a

Question

Which of the following statements regarding Fluid Mechanics is FALSE: (a) For a viscous fluid flowing through a pipe, the pressure drops from the start end of the pipe to the end of the flow at the far end of the pipe (b) The Conservation of Energy holds true in Fluid Mechanics (c) Fluids always move faster through a thicker diameter or wider pipe (d) The flow of a fluid remains constant through a single, unbroken section of pipe In an Adiabatic Process, which of the following is FALSE: (a) The Pressure, Volume, and Temperature all change (b) Work is done to or by the gas, and causes the Internal Energy of the gas to change (c) The ratio of the initial pressure to the final pressure is dependent on the initial volume, the final volume, and whether the gas is monatomic, diatomic, or complex. (d) The Heat Flow in this process must cancel out the Work Done by the Gas Which of the following statements regarding Archimedes' Principle is FALSE (a) Archimedes' principle can be used to determine the density of a material b) Buoyant forces exist in both gasses and liquids c) An object that is wholly or partially submerged in a fluid is subject to an upward force equal to the weight of the fluid displaced d) Objects that are more massive tend to sink, regardless of how those objects' masses are arranged

Explanation / Answer

10.

False statements are a and c.

As per Bernoullie's theorem, sum of kinetic energy, potential energy and pressure energy is constant over any section of the pipe that means if cross section is same through out and pipe is held horizontal then pressure will also be same for both ends .

As per equation of continuity fluids flow faster through narrower regions.

11.

False statement is d

As except d all other statements are pretty true about an adiabatic process but as we know for adiabatic processes heat flow is zero hence statement d looks to be wrong.

12.

Here again the statement d is false.

As whether or not an object will sink, depends on distribution of mass or density of the object and it does not depend only on the mass of the object.

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