Introduction to Fluid Mechanics: Master the Basics of Fluid Behavior

Question 1

In a hydrostatic system featuring both an open and a closed surface, the pressure at the open surface is:

Accepted Answer

Atmospheric pressure

Answer

Hydrostatic pressure

Answer

Gauge pressure

Answer

Vacuum pressure

Question 2

A manometer's purpose is to measure:

Accepted Answer

Pressure difference

Answer

Temperature

Answer

Fluid density

Answer

Gas velocity

Question 3

Buoyancy refers to a force that:

Accepted Answer

Acts upward on objects submerged or partially submerged in a fluid

Answer

Acts downward on objects submerged or partially submerged in a fluid

Answer

Acts horizontally on objects submerged or partially submerged in a fluid

Answer

Acts only on objects denser than the fluid

Question 4

In fluid mechanics, which of the following is a scalar quantity?

Accepted Answer

Pressure

Answer

Velocity

Answer

Stress

Answer

Acceleration

Question 5

Laminar flow in a pipe is characterized by:

Accepted Answer

Linear variation of fluid velocity across the pipe's cross-section

Answer

Constant fluid velocity across the pipe's cross-section

Answer

Tiny circular fluid paths within the pipe

Answer

High fluid viscosity

Question 6

A Pitot tube is used to measure:

Accepted Answer

Total pressure

Answer

Static pressure

Answer

Pressure gradient

Answer

Fluid density

Question 7

In a flow field, a streamline:

Accepted Answer

Is tangent to the local velocity vector at every point

Answer

Is perpendicular to the local velocity vector at every point

Answer

Is parallel to the flow direction at every point

Answer

Indicates the maximum velocity at every point

Question 8

Which of the following is NOT a fundamental property of fluids often considered in fluid mechanics?

Accepted Answer

Elasticity

Answer

Density

Answer

Viscosity

Answer

Thermal conductivity

Question 9

Buoyancy describes the upward force exerted by a fluid on a submerged object. What is the magnitude of the buoyant force acting on a 2 kg object submerged in water (density = 1000 kg/m³)?

Accepted Answer

20 N

Answer

10 N

Answer

2 N

Answer

1 N

Question 10

Which equation accurately represents fluid velocity in a pipe?

Accepted Answer

v = Q / A

Answer

v = Q * A

Answer

v = A / Q

Answer

v = 2 * Q * A

Question 11

A streamline is a line in a fluid flow field that connects points of equal:

Accepted Answer

Velocity

Answer

Pressure

Answer

Temperature

Answer

Density

Question 12

Which device is used to measure the pressure at a specific point within a flowing fluid?

Accepted Answer

Pitot tube

Answer

Manometer

Answer

Bourdon gauge

Answer

Viscometer

Question 13

Which of the following dimensionless parameters is utilized to characterize the flow regime in a pipe?

Accepted Answer

Reynolds number

Answer

Froude number

Answer

Mach number

Answer

Grashof number

Question 14

The force per unit area exerted on a stationary fluid is known as:

Accepted Answer

Pressure

Answer

Shear stress

Answer

Normal stress

Answer

Viscosity

Question 15

In fluid flow, the boundary layer is the region where:

Accepted Answer

Significant velocity gradients exist

Answer

Pressure gradients are negligible

Answer

Viscosity effects are dominant

Answer

Flow is fully developed

Question 16

Which fluid property measures the resistance of a fluid to flow?

Accepted Answer

Viscosity

Answer

Density

Answer

Pressure

Answer

Temperature

Question 17

In a static fluid, the pressure at a given depth is determined by:

Accepted Answer

Fluid density and depth

Answer

Fluid density alone

Answer

Fluid velocity alone

Answer

Fluid temperature alone

Question 18

When an object is submerged in a fluid, the buoyant force acting on it is:

Accepted Answer

Equal to the weight of the displaced fluid

Answer

Greater than the weight of the displaced fluid

Answer

Less than the weight of the displaced fluid

Answer

Dependent on the object's shape

Question 19

Laminar flow is characterized by:

Accepted Answer

Smooth, orderly layers of fluid

Answer

Disordered, chaotic fluid motion

Answer

High fluid velocity

Answer

Low fluid viscosity

Question 20

The Reynolds number is a dimensionless quantity used to determine:

Accepted Answer

The type of fluid flow

Answer

The fluid's viscosity

Answer

The fluid's density

Answer

The fluid's velocity

Question 21

The Bernoulli equation is applicable to which type of flow?

Accepted Answer

Steady, incompressible, inviscid flow

Answer

Steady, compressible, viscous flow

Answer

Unsteady, incompressible, inviscid flow

Answer

Unsteady, compressible, viscous flow

Question 22

Which instrument is commonly used to measure fluid velocity?

Accepted Answer

Pitot tube

Answer

Manometer

Answer

Thermometer

Answer

Hydrometer

Question 23

Fluid vorticity is primarily related to:

Accepted Answer

Fluid rotation

Answer

Fluid pressure

Answer

Fluid viscosity

Answer

Fluid density