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1 | |
The fluid pressure at the bottom of a container depends on the area of the bottom as well as the height of the fluid. |
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| | A) | True |
| | B) | False |
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2 | |
Fluid pressure is independent of the shape or size of the container. |
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| | A) | True |
| | B) | False |
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3 | |
At a particular depth in a liquid, the fluid pressure is the same in all directions except the upward direction. |
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| | A) | True |
| | B) | False |
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4 | |
Pascal’s law states that the buoyant force will always be equal to the weight of the displaced fluid. |
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| | A) | True |
| | B) | False |
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5 | |
If a rock has a density of a 4 kg/m3 on the earth, it will have a density of 4 kg/m3 on the moon. |
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| | A) | True |
| | B) | False |
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6 | |
Since the weight of the overlying fluid in a container is proportional to its density, the pressure at any depth is also proportional to the density of the fluid. |
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| | A) | True |
| | B) | False |
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7 | |
The buoyant force is equal to the resultant force acting on a submerged object. |
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| | A) | True |
| | B) | False |
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8 | |
The buoyant force on a weather balloon does not depend directly on the density of the gas inside the balloon. |
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| | A) | True |
| | B) | False |
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9 | |
The smaller the area of the input cylinder of a hydraulic press in comparison with the area of the output cylinder, the larger the mechanical advantage. |
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| | A) | True |
| | B) | False |
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10 | |
An open-tube manometer is a device used to measure absolute pressure. |
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| | A) | True |
| | B) | False |
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11 | |
The rate of flow is defined as the speed with which a fluid passes a certain cross section. |
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| | A) | True |
| | B) | False |
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12 | |
If a fluid is considered incompressible, and if we neglect internal friction, the rate of flow through a pipe remains constant, even when the cross-sectional area changes. |
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| | A) | True |
| | B) | False |
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13 | |
Decreasing the diameter of a pipe by one-half will cause the velocity of a fluid through the pipe to be quadrupled. |
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| | A) | True |
| | B) | False |
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14 | |
An increase in fluid velocity results in an increased pressure at the constriction in a venturi meter. |
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| | A) | True |
| | B) | False |
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15 | |
The pressure P in Bernoulli’s equation represents the absolute pressure and not the gauge pressure. |
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| | A) | True |
| | B) | False |
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16 | |
Bernoulli’s equation applies for fluids at rest as well as for fluids in motion. |
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| | A) | True |
| | B) | False |
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17 | |
If several holes are cut in the side of a container filled with water, the discharge velocity increases with depth below the surface; however, the range is a maximum at the midpoint. |
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| | A) | True |
| | B) | False |
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18 | |
If we consider a fluid to be incompressible and neglect the effects of friction, the change in velocity as a fluid goes through the constriction in a horizontal venturi tube does not depend on the density of the fluid. |
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| | A) | True |
| | B) | False |
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19 | |
Either weight density or mass density might be used in Bernoulli’s equation. |
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| | A) | True |
| | B) | False |
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20 | |
Torricelli’s theorem might be thought of as a special case of the more general Bernoulli’s equation. |
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| | A) | True |
| | B) | False |
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21 | |
Which of the following is independent of the density of a liquid? |
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| | A) | The total force at the bottom of the container |
| | B) | The pressure at the surface of the liquid |
| | C) | The pressure at the bottom of the container |
| | D) | The pressure at the sides of the container |
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22 | |
The hydraulic press operates primarily on |
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| | A) | Archimedes’ principle |
| | B) | Pascal’s law |
| | C) | Boyle’s law |
| | D) | Newton’s laws |
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23 | |
The ratio of an object’s weight density to its mass density is |
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| | A) | absolute pressure |
| | B) | less than 1 |
| | C) | equal to g |
| | D) | unitless |
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24 | |
The fluid pressure at any point in a liquid is |
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| | A) | proportional to its density |
| | B) | of the same magnitude |
| | C) | independent of height |
| | D) | directed downward only |
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25 | |
An open-tube manometer measures |
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| | A) | atmospheric pressure |
| | B) | absolute pressure |
| | C) | gauge pressure |
| | D) | sea-level pressure |
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26 | |
A cork float has a volume of 2 ft³ and a density of 12 lb/ft³. Its weight is |
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| | A) | 6 lb |
| | B) | 24 lb |
| | C) | 0.17 lb |
| | D) | 12 lb |
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27 | |
Gasoline has a density of 680 kg/m³. The pressure at the bottom of a container filled with gasoline to a height of 2 m is approximately |
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| | A) | 1360 N/m² |
| | B) | 3400 N/m² |
| | C) | 13,328 N/m² |
| | D) | 1500 N/m² |
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28 | |
A square chunk of cork weighing 2 N floats with exactly half its volume submerged in water. The weight of the displaced water is |
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| | A) | 4 N |
| | B) | 2 N |
| | C) | 1 N |
| | D) | 0.5 N |
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29 | |
A force of 600 lb is applied to the small piston of a hydraulic press. The diameter of the input piston is exactly one-half the diameter of the output piston. The lifting force exerted by the output piston is |
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| | A) | 150 lb |
| | B) | 300 lb |
| | C) | 1200 lb |
| | D) | 2400 lb |
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30 | |
What must the volume of a balloon be if it is to support a total mass of 1000 kg at a point where the density of air is 1.2 kg/m³? (The total mass includes that of the balloon and the helium with which it is filled, as well as the payload.) |
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| | A) | 85 m³ |
| | B) | 833 m³ |
| | C) | 1200 m³ |
| | D) | 8166 m³ |
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31 | |
The rate of flow of a fluid out of an opening at the bottom of a container does not depend on |
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| | A) | the depth of the hole |
| | B) | the area of the opening |
| | C) | the density of the fluid |
| | D) | the acceleration of gravity |
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32 | |
The product of velocity and cross-sectional area for a liquid flowing through a pipe is a measure of |
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| | A) | rate of flow |
| | B) | fluid pressure |
| | C) | volume of fluid |
| | D) | none of these |
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33 | |
The velocity of discharge of a fluid through an orifice is associated most closely with |
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| | A) | Bernoulli |
| | B) | Torricelli |
| | C) | Venturi |
| | D) | Archimedes |
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34 | |
When one blows air across the top of a sheet of paper, the paper rises because of the |
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| | A) | force of the blow |
| | B) | drop in the pressure above the paper |
| | C) | increase in pressure below the paper |
| | D) | increase in temperature of the air |
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35 | |
When there is no change in pressure at the beginning and end of a flow process, Bernoulli’s equation reduces to |
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| | A) | P = ρgh |
| | B) | P + ½ρv² = constant |
| | C) | v = √2gh |
| | D) | ρgh = constant |
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36 | |
Water flowing at a velocity of 20 cm/s in a 6-cm-diameter pipe encounters a constriction 3 cm in diameter. The velocity through the constriction is |
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| | A) | 80 cm/s |
| | B) | 40 cm/s |
| | C) | 5 cm/s |
| | D) | 10 cm/s |
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37 | |
A container 4 ft high is filled to the top with liquid. The discharge velocity from a hole at the bottom of the container is |
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| | A) | 12 ft/s |
| | B) | 16 ft/s |
| | C) | 20 ft/s |
| | D) | 24 ft/s |
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38 | |
In a horizontal venturi tube, the pressure at the inlet is 27 lb/ft², and the velocity of a liquid flowing through it is 10 ft/s. The density of the liquid is 2 slugs/ft³, and the pressure at the throat of the venturi drops to 6 lb/ft². The velocity of the liquid in the throat is approximately |
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| | A) | 11 ft/s |
| | B) | 15 ft/s |
| | C) | 20 ft/s |
| | D) | 25 ft/s |
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39 | |
The dimensions of every term in Bernoulli’s equation are those of |
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| | A) | length |
| | B) | velocity |
| | C) | density |
| | D) | pressure |
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40 | |
Water rushes out the end of a pipe at the rate of 2 m³/s and with a velocity of 4 m/s. The area of the opening is |
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| | A) | 2 m² |
| | B) | 1 m² |
| | C) | 0.5 m² |
| | D) | 0.25 m² |
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41 | |
Gauge pressure is pressure less pressure. |
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42 | |
The forces exerted by a fluid on the walls of its container are always . |
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43 | |
The fluid pressure is directly proportional to the of the fluid and to its . |
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44 | |
Fluid pressure is independent of the or of its container. |
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45 | |
The weight density of a body is equal to the ratio of its to its . Is it a universal constant for a given material? . |
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46 | |
An object that is completely or partly submerged in a fluid experiences an upward force, called the force, which is equal to the of the fluid displaced. This is principle. |
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47 | |
An open, U-shaped tube partially filled with mercury can be used to measure pressure. Such a device is called a(n) . |
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48 | |
If the weight of the displaced fluid exceeds the weight of a submerged body, the body will . |
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49 | |
The press operates on the principle that an output pressure is essentially equal to an input pressure. This principle was named after . |
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50 | |
The ideal mechanical advantage for a hydraulic press is the ratio of the of the output piston to that of the input piston. |
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51 | |
The is defined as the volume of fluid that passes a certain cross section per unit of time. Its unit is in the USCS. |
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52 | |
The motion of a fluid in which every particle in the fluid flows the same path past a particular point as that followed by previous particles is called . |
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53 | |
The principle is responsible for mixing fuel with air in the throat of a carburetor as air rushes through it. |
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54 | |
In our discussion of fluids, four physical quantities are derived from the fundamental quantities of mass, length, and time and play important roles. They are , , ,
and . |
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55 | |
The discharge velocity increases with below the surface of a liquid. The range of the discharged liquid is a maximum at the . |
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56 | |
The velocity of discharge from an orifice depends on the and the . The magnitude of the velocity is predicted by theorem. |
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57 | |
The product of and is a constant and is a measure of the rate of flow. |
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58 | |
Fluid flow in which swirls and eddies increase the frictional drag is called flow. |
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59 | |
In applying Bernoulli’s equation, it must be remembered that P represents pressure and ρ represents density. |
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60 | |
In Bernoulli’s equation, the sum of , , and must remain constant. |
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