Fluid Mechanics Basics: Master the Fundamentals of Fluid Behavior

Question 1

Which of the following is a fundamental property of fluids?

Accepted Answer

Density

Answer

Mass

Answer

Surface tension

Answer

Elasticity

Question 2

According to Pascal's law, the pressure exerted by a fluid at rest is:

Accepted Answer

Equal in all directions

Answer

Strongest at the bottom

Answer

Strongest at the top

Answer

Dependent on the shape of the container

Question 3

Bernoulli's equation for incompressible flow relates the following quantities:

Accepted Answer

Pressure, velocity, and elevation

Answer

Temperature, pressure, and density

Answer

Viscosity, velocity, and density

Answer

Volume, mass, and pressure

Question 4

The Reynolds number is a dimensionless ratio used to characterize:

Accepted Answer

Flow regime

Answer

Fluid density

Answer

Pipe diameter

Answer

Surface roughness

Question 5

Which of the following is NOT a characteristic of laminar flow?

Accepted Answer

Turbulent mixing

Answer

Smooth, parallel layers

Answer

Low Reynolds number

Answer

Viscosity-dominated

Question 6

Which instrument is commonly used to measure fluid pressure?

Accepted Answer

Manometer

Answer

Thermometer

Answer

Anemometer

Answer

Hygrometer

Question 7

In fluid mechanics, which property of a fluid primarily determines its resistance to flow?

Accepted Answer

Viscosity

Answer

Density

Answer

Surface tension

Answer

Compressibility

Question 8

When a fluid is at rest, which statement accurately describes its state?

Accepted Answer

The net force acting upon it is zero.

Answer

There are no external forces acting upon it.

Answer

It is moving at a constant velocity.

Answer

It is moving with a constant acceleration.

Question 9

In a system involving a stationary fluid, how does pressure typically vary with depth?

Accepted Answer

Pressure increases linearly with increasing depth.

Answer

Pressure remains constant throughout.

Answer

Pressure increases quadratically with increasing depth.

Answer

Pressure decreases linearly with increasing depth.

Question 10

Which of the following is NOT considered an application of fluid mechanics?

Accepted Answer

Designing electrical circuits

Answer

Designing aircraft

Answer

Designing wind turbines

Answer

Designing bridges

Question 11

The branch of fluid mechanics that deals with the flow of fluids at high velocities is known as:

Accepted Answer

Compressible fluid mechanics

Answer

Incompressible fluid mechanics

Answer

Viscous fluid mechanics

Answer

Inviscid fluid mechanics

Question 12

Which equation describes the conservation of mass for an incompressible flow?

Accepted Answer

Continuity equation

Answer

Bernoulli's equation

Answer

Navier-Stokes equations

Answer

Euler's equations

Question 13

A streamline is a line that:

Accepted Answer

Is tangent to the velocity vector at every point

Answer

Is perpendicular to the velocity vector at every point

Answer

Has a constant pressure along its length

Answer

Has a constant velocity along its length

Question 14

Which of the following is a characteristic of turbulent flow?

Accepted Answer

Highly disordered and chaotic

Answer

Smooth and predictable

Answer

Laminar and viscous

Answer

Inviscid and irrotational

Question 15

The Reynolds number is a dimensionless parameter that characterizes:

Accepted Answer

The ratio of inertial forces to viscous forces

Answer

The ratio of viscous forces to gravitational forces

Answer

The ratio of pressure forces to inertial forces

Answer

The ratio of gravitational forces to pressure forces

Question 16

The Bernoulli equation is applicable for:

Accepted Answer

Steady, incompressible, inviscid flow

Answer

Steady, compressible, inviscid flow

Answer

Unsteady, incompressible, inviscid flow

Answer

Unsteady, compressible, inviscid flow

Question 17

The equation of continuity for an incompressible fluid flowing through a pipe of varying cross-sectional area is given by:

Accepted Answer

AV = constant

Answer

AV^2 = constant

Answer

V^2A = constant

Answer

A^2V = constant

Question 18

The velocity profile for laminar flow in a circular pipe is:

Accepted Answer

Parabolic

Answer

Exponential

Answer

Hyperbolic

Answer

Linear

Question 19

The Bernoulli equation is applicable to:

Accepted Answer

Inviscid, incompressible flows

Answer

Viscous, compressible flows

Answer

Viscous, incompressible flows

Answer

Inviscid, compressible flows