 |
| 1.
| |
According to Pascal, pressure applied to a fluid __________.
|
| | A) | is transmitted unchanged throughout the fluid |
| | B) | fluctuates as it is transmitted throughout the fluid |
| | C) | increases as it moves through the fluid |
| | D) | decreases as it moves through the fluid |
|
|
|
| 2.
| |
__________ is the force per unit area applied on the surface of an object.
|
| | A) | Pressure |
| | B) | Weight |
| | C) | Gravity |
| | D) | Mass |
|
|
|
| 3.
| |
What is the approximate pressure exerted on your body by the atmosphere at sea level?
|
| | A) | 1,000 Pa |
| | B) | 100 Pa |
| | C) | 100,000 Pa |
| | D) | 10,000 Pa |
|
|
|
| 4.
| |
What determines whether an object will sink or float?
|
| | A) | the direction of the buoyant force on the object |
| | B) | whether the buoyant force is larger than the object's weight |
| | C) | whether gravity acts on the object in the fluid |
| | D) | whether a buoyant force acts on the object |
|
|
|
| 5.
| |
As the height of a fluid above a surface __________, the pressure exerted by the fluid on that surface __________.
|
| | A) | increases, decreases |
| | B) | increases, increases |
| | C) | The pressure exerted by a fluid on a surface is unaffected by the height of the fluid. |
| | D) | decreases, increases |
|
|
|
| 6.
| |
A(n) __________ uses a fluid to increase an applied force.
|
| | A) | compound machine |
| | B) | wheel and axle |
| | C) | hydraulic system |
| | D) | simple machine |
|
|
|
| 7.
| |
The same force is applied to two different objects. The area over which the force is applied to object A is twice as large as the area over which the force is applied to object B. Which of the following statements is true of these objects?
|
| | A) | The pressure applied to object A is equal to the square of the pressure applied to object B. |
| | B) | If the same force is used, the pressure exerted on the objects is the same. |
| | C) | The pressure exerted on object B is twice as great as the pressure exerted on object A. |
| | D) | The pressure exerted on object A is twice as great as the pressure exerted on object B. |
|
|
|
| 8.
| |
What two things must you know to calculate the pressure exerted on a surface?
|
| | A) | the area over which a force is applied and the mass of the object applying the pressure |
| | B) | the force and the weight of the object |
| | C) | the force that is applied and the density of the surface |
| | D) | the force and the area over which it is applied |
|
|
|
| 9.
| |
Which of the following is NOT a fluid?
|
| | A) | pure oxygen |
| | B) | steam |
| | C) | water |
| | D) | ice |
|
|
|
| 10.
| |
Pressure is defined as __________.
|
| | A) | P1 = P2 |
| | B) | pressure = force/area |
| | C) | pressure = mass/acceleration |
| | D) | pressure = area/force |
|
|
|
| 11.
| |
Bernoulli's principle states that as the velocity of a fluid __________, the pressure exerted by the fluid __________ .
|
| | A) | decreases, decreases |
| | B) | increases, increases |
| | C) | decreases, increases |
| | D) | increases, decreases |
|
|
|
| 12.
| |
At what depth is the buoyant force on a submerged object the greatest?
|
| | A) | The buoyant force on a submerged object is the same at any depth. |
| | B) | on the ocean floor |
| | C) | at sea level |
| | D) | at the surface |
|
|
|
| 13.
| |
An instrument called a(n) __________ is used to measure atmospheric pressure.
|
| | A) | barometer |
| | B) | galvanometer |
| | C) | odometer |
| | D) | thermometer |
|
|
|
| 14.
| |
Archimedes' principle states that __________.
|
| | A) | the buoyant force on an object is greater than the weight of the fluid it displaces |
| | B) | when the speed of a fluid increases, the pressure exerted by the fluid decreases |
| | C) | the buoyant force on an object is equal to the weight of the fluid it displaces |
| | D) | pressure applied to a fluid is transmitted unchanged throughout the fluid |
|
|
|
| 15.
| |
An object weighing 50 kg is floating in a fluid. What is the buoyant force of the fluid on the object?
|
| | A) | > 50 kg |
| | B) | 50 kg |
| | C) | < 50 kg |
| | D) | Not enough information is given. |
|
|
|
| 16.
| |
How does Bernoulli's principle explain how airplanes fly?
|
| | A) | The backward force exerted by an engine creates an equal and opposite push, resulting in lift. |
| | B) | Air pressure is greater on the top of the wings, creating lift. |
| | C) | The air pressure on top of the wing is equal and opposite to the air pressure on the bottom, creating a balanced upward force. |
| | D) | Air pressure is greater below the wings, creating lift. |
|
|
|
| 17.
| |
The supporting force exerted by a fluid on an object immersed in it is called __________.
|
| | A) | viscosity |
| | B) | density |
| | C) | lift |
| | D) | buoyant force |
|
|
|
| 18.
| |
If a cube is submerged in water, where on the cube is the pressure exerted by the water the greatest?
|
| | A) | on the bottom |
| | B) | The pressure is equal on all sides of a cube. |
| | C) | on the sides |
| | D) | on the top |
|
|
|
| 19.
| |
In which direction is pressure by a fluid exerted on an object that is submerged in it?
|
| | A) | downward |
| | B) | upward |
| | C) | parallel to the vertical surfaces, perpendicular to the horizontal surfaces |
| | D) | perpendicular to all surfaces of the object |
|
|
|
| 20.
| |
A __________ is any substance that has no definite shape and can flow.
|
| | A) | plasma |
| | B) | fluid |
| | C) | gas |
| | D) | liquid |
|
|
.
