Fluid Statics: Master the Forces at Play in Fluids at Rest

Question 1

Which of the following statements accurately describes fluid statics?

Accepted Answer

Fluids at rest exert pressure equally in every direction.

Answer

Fluids at rest exert pressure solely in a horizontal direction.

Answer

Fluids at rest have zero pressure acting on their container's walls.

Answer

Fluids at rest apply pressure only to the bottom surface of their container.

Question 2

According to Archimedes' principle, the buoyant force acting on a submerged object is equivalent to:

Accepted Answer

The weight of the fluid displaced by the object.

Answer

The weight of the object itself.

Answer

The weight of the fluid above the object.

Answer

The weight of the fluid below the object.

Question 3

Hydrostatic pressure at a given depth in a fluid:

Accepted Answer

Increases proportionally with increasing depth.

Answer

Decreases proportionally with increasing depth.

Answer

Remains constant regardless of depth.

Answer

Varies based on the shape of the container.

Question 4

Which of the following factors has no influence on hydrostatic pressure at a given depth in a fluid?

Accepted Answer

Surface area of the fluid

Answer

Depth of the fluid

Answer

Density of the fluid

Answer

Acceleration due to gravity

Question 5

Which of the following is NOT a characteristic of an ideal fluid?

Accepted Answer

Viscous

Answer

Incompressible

Answer

Frictionless

Answer

Homogeneous

Question 6

The flow rate of a fluid through a pipe is determined by:

Accepted Answer

Pressure difference, pipe diameter, and fluid viscosity

Answer

Pressure difference and pipe diameter only

Answer

Pipe diameter and fluid viscosity only

Answer

Pipe roughness and fluid density only

Question 7

According to Bernoulli's principle, as the speed of a fluid increases in a horizontal stream, what happens to its pressure?

Accepted Answer

Pressure falls.

Answer

Pressure rises.

Answer

Pressure stays the same.

Question 8

How does Pascal's Law contribute to the operation of hydraulic systems?

Accepted Answer

It enables equal pressure distribution throughout the system, regardless of the fluid volume.

Answer

It generates a vacuum within the system, allowing for effortless fluid movement.

Answer

It creates an upward buoyant force that lifts objects immersed in the fluid.

Answer

It increases the fluid's velocity by applying force to it.

Question 9

Which of the following factors does NOT affect hydrostatic pressure at a given depth?

Accepted Answer

Shape of the container

Answer

Density of the fluid

Answer

Depth of the fluid

Answer

Acceleration due to gravity

Question 10

A simple U-tube manometer is used to measure the pressure of a gas. If the pressure difference between the gas and the atmosphere is 20 kPa and the density of the manometer fluid is 800 kg/m³, what is the height difference between the two columns of the manometer?

Accepted Answer

0.25 m

Answer

0.5 m

Answer

0.125 m

Answer

0.375 m

Question 11

A fluid exerts a force on a submerged body that is:

Accepted Answer

Equal to the weight of the fluid displaced by the body.

Answer

Dependent on the shape of the body.

Answer

Equal to the density of the fluid.

Question 12

The flow of a fluid is considered laminar when:

Accepted Answer

The fluid particles move in layers without any cross-mixing.

Answer

The fluid has a high viscosity.

Answer

The fluid particles move in a turbulent manner.

Question 13

Which of the following statements accurately describes fluid flow?

Accepted Answer

Laminar flow is characterized by fluid particles moving in distinct layers.

Answer

Turbulent flow is characterized by smooth, regular motion.

Answer

Viscosity does not affect fluid flow.

Question 14

Which of the following is the SI unit of pressure?

Accepted Answer

Pascal

Answer

Newton

Answer

Joule

Question 15

Which of the following is NOT a condition for equilibrium of a floating body?

Accepted Answer

The weight of the body is greater than the buoyant force acting on it.

Answer

The center of gravity of the body is below its center of buoyancy.

Answer

The body is in translational equilibrium.

Question 16

A cylindrical tank with a radius of 10 cm holds 2 liters of water. What is the height of the tank?

Accepted Answer

12.57 cm

Answer

50.26 cm

Answer

25.13 cm

Answer

6.28 cm

Question 17

A U-tube manometer filled with mercury (density 13,600 kg/m³) shows a height difference of 0.15 meters between the two mercury levels. What is the pressure difference between the two points being measured?

Accepted Answer

2,040 N/m²

Answer

2,520 N/m²

Answer

1,020 N/m²

Answer

1,560 N/m²

Question 18

A dam has a trapezoidal cross-section: 10 meters wide at the top, 20 meters wide at the base, and 15 meters high. If the water behind the dam reaches the top, what is the total force exerted by the water on the dam?

Accepted Answer

2.25 MN (Mega Newtons)

Answer

3 MN

Answer

1.5 MN

Answer

1 MN

Question 19

Which formula correctly calculates the pressure exerted by a fluid at rest?

Accepted Answer

P = ρgh

Answer

P = ρgV

Answer

P = V/ρg

Answer

P = gh/ρ

Question 20

Which factor does NOT affect the buoyancy force acting on an object submerged in a fluid?

Accepted Answer

Density of the object

Answer

Volume of the object

Answer

Density of the fluid

Answer

Acceleration due to gravity

Question 21

A fluid (density 800 kg/m³) flows through a pipe with a cross-sectional area of 0.01 m² at a velocity of 2 m/s. What is the mass flow rate of the fluid?

Accepted Answer

16 kg/s

Answer

64 kg/s

Answer

32 kg/s

Answer

8 kg/s

Question 22

Which device is used to measure the pressure of a fluid?

Accepted Answer

Manometer

Answer

Anemometer

Answer

Thermometer

Answer

Hydrometer

Question 23

What is the SI unit of pressure?

Accepted Answer

Pascal

Answer

Watt

Answer

Newton

Answer

Joule

Question 24

Which of these is NOT a typical application of fluid statics?

Accepted Answer

Designing aircraft wings

Answer

Predicting the performance of hydraulic systems

Answer

Determining the flow rate of fluids in pipelines

Answer

Analyzing the stability of dams

Question 25

What principle explains the upward force exerted on an object submerged in a fluid?

Accepted Answer

Archimedes' principle

Answer

Pascal's principle

Answer

Torricelli's principle

Answer

Bernoulli's principle