Question 1

A student standardizes the concentration of a salt-water solution by slowly adding salt until an egg will just float. The procedure is based on the assumption that:

Accepted Answer

A)  all eggs have the same volume 
B)  all eggs have the same weight 
C)  all eggs have the same density 
D)  all eggs have the same shape 
E)  the salt tends to neutralize the cholesterol in the egg 
A)  all eggs have the same volume 
B)  all eggs have the same weight 
C)  all eggs have the same density 
D)  all eggs have the same shape 
E)  the salt tends to neutralize the cholesterol in the egg

Question 2

A U-tube has dissimilar arms, one having twice the diameter of the other. It contains an incompressible fluid and is fitted with a sliding piston in each arm, with each piston in contact with the fluid. When an applied force does work W in pushing the piston in the narrow arm down, the fluid does work __________ on the piston in the wide arm.

Accepted Answer

A)  W 
B)  2W 
C)  W/2 
D)  4W 
E)  W/4 
A)  W 
B)  2W 
C)  W/2 
D)  4W 
E)  W/4

Question 3

An object hangs from a spring balance. The balance indicates 30 N in air, 20 N when the object is submerged in water.What does the balance indicate when the object is submerged in liquid with a density that is half of water?:

Accepted Answer

A)  20 N 
B)  25 N 
C)  30 N 
D)  35 N 
E)  40 N 
A)  20 N 
B)  25 N 
C)  30 N 
D)  35 N 
E)  40 N

Question 4

A water line enters a house 2.0 m below ground. A smaller diameter pipe carries water to a faucet 5.0 m above ground, on the second floor. Water flows at 2.0 m/s in the main line and at 7.0 m/s on the second floor. Take the density of water to be 1.0 * 103 kg/m3. The diffenernce in pressure in the main line is 2.0 *105 Pa, then the pressure on the second floor is:

Accepted Answer

A)  7.5 * 104 Pa with the main line at the higher pressure 
B)  2.65 *104 Pa with the main line at the higher pressure 
C)  7.5 * 104 Pa with the main line at the lower pressure 
D)  2.65 * 104 Pa with the main line at the lower pressure 
E)  9.4 *104 Pa with the main line at the higher pressure 
A)  7.5 * 104 Pa with the main line at the higher pressure 
B)  2.65 *104 Pa with the main line at the higher pressure 
C)  7.5 * 104 Pa with the main line at the lower pressure 
D)  2.65 * 104 Pa with the main line at the lower pressure 
E)  9.4 *104 Pa with the main line at the higher pressure

Question 5

A constriction in a pipe reduces its diameter from 4.0 cm to 2.0 cm. Where the pipe is narrow the water speed is 8.0 m/s. Where it is wide the water speed is:

Accepted Answer

A)  2.0 m/s 
B)  4.0 m/s 
C)  8.0 m/s 
D)  16 m/s 
E)  32 m/s 
A)  2.0 m/s 
B)  4.0 m/s 
C)  8.0 m/s 
D)  16 m/s 
E)  32 m/s

Question 6

The quantity y appearing in Bernoulli's equation MUST be measured:

Accepted Answer

A)  upward from the center of the Earth 
B)  upward from the surface of the Earth 
C)  upward from the lowest point in the flow 
D)  downward from the highest point in the flow 
E)  upward from any convenient level 
A)  upward from the center of the Earth 
B)  upward from the surface of the Earth 
C)  upward from the lowest point in the flow 
D)  downward from the highest point in the flow 
E)  upward from any convenient level

Question 7

"An object completely submerged in a fluid displaces its own volume of fluid." This is:

Accepted Answer

A)  Pascal's paradox 
B)  Archimedes' principle 
C)  Pascal's principle 
D)  true, but none of the above 
E)  false 
A)  Pascal's paradox 
B)  Archimedes' principle 
C)  Pascal's principle 
D)  true, but none of the above 
E)  false

Question 8

A non-viscous incompressible liquid is flowing through a horizontal pipe of constant cross-section. Bernoulli's equation and the equation of continuity predict that the drop in pressure along the pipe:

Accepted Answer

A)  is zero 
B)  depends on the length of the pipe 
C)  depends on the fluid velocity 
D)  depends on the cross-sectional area of the pipe 
E)  depends on the height of the pipe 
A)  is zero 
B)  depends on the length of the pipe 
C)  depends on the fluid velocity 
D)  depends on the cross-sectional area of the pipe 
E)  depends on the height of the pipe

Question 9

A U-tube has dissimilar arms, one having twice the diameter of the other. It contains an incompressible fluid and is fitted with a sliding piston in each arm, with each piston in contact with the fluid. When the piston in the narrow arm is pushed down a distance d, the piston in the wide arm rises a distance:

Accepted Answer

A)  d 
B)  2d 
C)  d/2 
D)  4d 
E)  d/4 
A)  d 
B)  2d 
C)  d/2 
D)  4d 
E)  d/4

Question 10

The diagram shows a pipe of uniform cross section in which water is flowing. The directions of flow and the volume flow rates (in cm3/s) are shown for various portions of the pipe. The direction of flow and the volume flow rate in the portion marked A are:

Accepted Answer

A)  $\downarrow$ and 3 cm3/s 
B)  $\uparrow$  and 7 cm3/s 
C)  $\downarrow$ and 9 cm3/s 
D)  $\uparrow$  and 11 cm3/s 
E)  $\downarrow$and 15 cm3/s 
A)  $\downarrow$ and 3 cm3/s 
B)  $\uparrow$  and 7 cm3/s 
C)  $\downarrow$ and 9 cm3/s 
D)  $\uparrow$  and 11 cm3/s 
E)  $\downarrow$and 15 cm3/s

Question 11

A small steel ball floats in a half-full container of mercury. When water is added:

Accepted Answer

A)  the ball will float on the water 
B)  the ball will rise slightly 
C)  the mercury will float on the water 
D)  the ball will sink to the bottom of the container 
E)  the ball will lower slightly more into the mercury 
A)  the ball will float on the water 
B)  the ball will rise slightly 
C)  the mercury will float on the water 
D)  the ball will sink to the bottom of the container 
E)  the ball will lower slightly more into the mercury

Question 12

A pirate chest rests at the bottom of an ocean. If the water is still, the net force it exerts on the chest:

Accepted Answer

A)  is upward 
B)  is downward 
C)  is zero 
D)  depends on the mass of the chest 
E)  depends on the contents of the chest 
A)  is upward 
B)  is downward 
C)  is zero 
D)  depends on the mass of the chest 
E)  depends on the contents of the chest

Question 13

Bernoulli's equation can be derived from the conservation of:

Accepted Answer

A)  energy 
B)  mass 
C)  angular momentum 
D)  volume 
E)  pressure 
A)  energy 
B)  mass 
C)  angular momentum 
D)  volume 
E)  pressure

Question 14

To measure moderately low pressures oil with a density of 8.5 * 102 kg/m3 is used in place of mercury in a barometer. A change in the oil column of 1.0 mm indicates a change in pressure of about:

Accepted Answer

A)  1.2 *10-7 Pa 
B)  1.2 *10-5 Pa 
C)  0.85 Pa 
D)  1.2 Pa 
E)  8.3 Pa 
A)  1.2 *10-7 Pa 
B)  1.2 *10-5 Pa 
C)  0.85 Pa 
D)  1.2 Pa 
E)  8.3 Pa

Question 15

An airtight box, having a lid of area 80 cm2, is partially evacuated. Atmospheric pressure is 1.01 *105 Pa. A force of 108 lb is required to pull the lid off the box. The pressure in the box was:

Accepted Answer

A)  2.60 * 104 Pa 
B)  6.35 * 104 Pa 
C)  7.50 * 104 Pa 
D)  1.38 * 105 Pa 
E)  1.76 * 105 Pa 
A)  2.60 * 104 Pa 
B)  6.35 * 104 Pa 
C)  7.50 * 104 Pa 
D)  1.38 * 105 Pa 
E)  1.76 * 105 Pa

Question 16

A bucket resting on the floor of an elevator contains an incompressible fluid of density $\rho$. When the elevator has a downward acceleration of magnitude a the pressure difference between two points in a fluid, separated by a vertical distance $\Delta$h, is given by:

Accepted Answer

A) $\rho$a$\Delta$h 
B)  $\rho$g$\Delta$h 
C)  $\rho$(g + a)$\Delta$h 
D)  $\rho$(g - a)$\Delta$h 
E)  $\rho$ga$\Delta$h 
A) $\rho$a$\Delta$h 
B)  $\rho$g$\Delta$h 
C)  $\rho$(g + a)$\Delta$h 
D)  $\rho$(g - a)$\Delta$h 
E)  $\rho$ga$\Delta$h

Question 17

A fluid is undergoing "incompressible" flow. This means that:

Accepted Answer

A)  the pressure at a given point cannot change with time 
B)  the velocity at a given point cannot change with time 
C)  the velocity must be the same everywhere 
D)  the pressure must be the same everywhere 
E)  the density cannot change with time or location 
A)  the pressure at a given point cannot change with time 
B)  the velocity at a given point cannot change with time 
C)  the velocity must be the same everywhere 
D)  the pressure must be the same everywhere 
E)  the density cannot change with time or location

Question 18

A bucket resting on the floor of an elevator contains an incompressible fluid of density $\rho$. When the elevator has an upward acceleration a the pressure difference between two points in a fluid separated by a vertical distance $\Delta$h, is given by:

Accepted Answer

A)  $\rho$a$\Delta$h 
B)  $\rho$g$\Delta$h 
C)  $\rho$(g + a)$\Delta$h 
D)  $\rho$(g - a)$\Delta$h 
E)  $\rho$ga$\Delta$h 
A)  $\rho$a$\Delta$h 
B)  $\rho$g$\Delta$h 
C)  $\rho$(g + a)$\Delta$h 
D)  $\rho$(g - a)$\Delta$h 
E)  $\rho$ga$\Delta$h

Question 19

Several cans of different sizes and shapes are all filled with the same liquid to the same depth. Then:

Accepted Answer

A)  the weight of the liquid is the same for all cans 
B)  the force of the liquid on the bottom of each can is the same 
C)  the least pressure is at the bottom of the can with the largest bottom area 
D)  the greatest pressure is at the bottom of the can with the largest bottom area 
E)  the pressure on the bottom of each can is the same 
A)  the weight of the liquid is the same for all cans 
B)  the force of the liquid on the bottom of each can is the same 
C)  the least pressure is at the bottom of the can with the largest bottom area 
D)  the greatest pressure is at the bottom of the can with the largest bottom area 
E)  the pressure on the bottom of each can is the same

Question 20

A 0.50 N metal sinker appears (as measured using a spring scale) to have a mass of 0.45 N when submerged in water. The specific gravity of the metal is:

Accepted Answer

A)  6 
B)  8 
C)  9 
D)  10 
E)  12 
A)  6 
B)  8 
C)  9 
D)  10 
E)  12

Exam 14: Fluids

A student standardizes the concentration of a salt-water solution by slowly adding salt until an egg will just float. The procedure is based on the assumption that:

An object hangs from a spring balance. The balance indicates 30 N in air, 20 N when the object is submerged in water.What does the balance indicate when the object is submerged in liquid with a density that is half of water?:

A constriction in a pipe reduces its diameter from 4.0 cm to 2.0 cm. Where the pipe is narrow the water speed is 8.0 m/s. Where it is wide the water speed is:

The quantity y appearing in Bernoulli's equation MUST be measured:

"An object completely submerged in a fluid displaces its own volume of fluid." This is:

A non-viscous incompressible liquid is flowing through a horizontal pipe of constant cross-section. Bernoulli's equation and the equation of continuity predict that the drop in pressure along the pipe:

The diagram shows a pipe of uniform cross section in which water is flowing. The directions of flow and the volume flow rates (in cm3/s) are shown for various portions of the pipe. The direction of flow and the volume flow rate in the portion marked A are:

A small steel ball floats in a half-full container of mercury. When water is added:

A pirate chest rests at the bottom of an ocean. If the water is still, the net force it exerts on the chest:

Bernoulli's equation can be derived from the conservation of:

To measure moderately low pressures oil with a density of 8.5 * 102 kg/m3 is used in place of mercury in a barometer. A change in the oil column of 1.0 mm indicates a change in pressure of about:

An airtight box, having a lid of area 80 cm2, is partially evacuated. Atmospheric pressure is 1.01 *105 Pa. A force of 108 lb is required to pull the lid off the box. The pressure in the box was:

A bucket resting on the floor of an elevator contains an incompressible fluid of density ρ\rhoρ . When the elevator has a downward acceleration of magnitude a the pressure difference between two points in a fluid, separated by a vertical distance Δ\DeltaΔ h, is given by:

A fluid is undergoing "incompressible" flow. This means that:

A bucket resting on the floor of an elevator contains an incompressible fluid of density ρ\rhoρ . When the elevator has an upward acceleration a the pressure difference between two points in a fluid separated by a vertical distance Δ\DeltaΔ h, is given by:

Several cans of different sizes and shapes are all filled with the same liquid to the same depth. Then:

A 0.50 N metal sinker appears (as measured using a spring scale) to have a mass of 0.45 N when submerged in water. The specific gravity of the metal is:

Measurement

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Motion in Two and Three Dimensions

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Rotation

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Filters

The diagram shows a pipe of uniform cross section in which water is flowing. The directions of flow and the volume flow rates (in cm³/s) are shown for various portions of the pipe. The direction of flow and the volume flow rate in the portion marked A are:

To measure moderately low pressures oil with a density of 8.5 * 10² kg/m³ is used in place of mercury in a barometer. A change in the oil column of 1.0 mm indicates a change in pressure of about:

An airtight box, having a lid of area 80 cm², is partially evacuated. Atmospheric pressure is 1.01 *10⁵ Pa. A force of 108 lb is required to pull the lid off the box. The pressure in the box was:

A bucket resting on the floor of an elevator contains an incompressible fluid of density $\rho$ . When the elevator has a downward acceleration of magnitude a the pressure difference between two points in a fluid, separated by a vertical distance $\Delta$ h, is given by:

A bucket resting on the floor of an elevator contains an incompressible fluid of density $\rho$ . When the elevator has an upward acceleration a the pressure difference between two points in a fluid separated by a vertical distance $\Delta$ h, is given by: