Question 1

A fluid is undergoing steady flow. Therefore:

Accepted Answer

A)  the velocity of any given molecule of fluid does not change 
B)  the pressure does not vary from point to point 
C)  the velocity at any given point does not vary with time 
D)  the density does not vary from point to point 
E)  the flow is not uphill or downhill 
A)  the velocity of any given molecule of fluid does not change 
B)  the pressure does not vary from point to point 
C)  the velocity at any given point does not vary with time 
D)  the density does not vary from point to point 
E)  the flow is not uphill or downhill C

Question 2

A certain object floats in fluids of density   Which of the following statements is true?

Accepted Answer

A)  the buoyant force of fluid 1 is greater than the buoyant forces of the other two fluids 
B)  the buoyant force of fluid 3 is greater than the buoyant forces of the other two fluids 
C)  the three fluids exert the same buoyant force 
D)  the object displace the same volume of all three fluids 
E)  none of these are true 
A)  the buoyant force of fluid 1 is greater than the buoyant forces of the other two fluids 
B)  the buoyant force of fluid 3 is greater than the buoyant forces of the other two fluids 
C)  the three fluids exert the same buoyant force 
D)  the object displace the same volume of all three fluids 
E)  none of these are true C

Question 3

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 A

Question 4

Mercury is a convenient liquid to use in a barometer because:

Accepted Answer

A)  it is a metal 
B)  it has a high boiling point 
C)  it expands little with temperature 
D)  it has a high density 
E)  it looks silvery 
A)  it is a metal 
B)  it has a high boiling point 
C)  it expands little with temperature 
D)  it has a high density 
E)  it looks silvery

Question 5

The pressure exerted on the ground by a man is greatest when:

Accepted Answer

A)  he stands with both feet flat on the ground 
B)  he stands flat on one foot 
C)  he stands on the toes of one foot 
D)  he lies down on the ground 
E)  all of the above yield the same pressure 
A)  he stands with both feet flat on the ground 
B)  he stands flat on one foot 
C)  he stands on the toes of one foot 
D)  he lies down on the ground 
E)  all of the above yield the same pressure

Question 6

1 Pa is:

Accepted Answer

A)  1 N/m 
B)  1 m/N 
C)  1 kg/m . s 
D)  1 kg/m . s2 
E)  1 N/m . s 
A)  1 N/m 
B)  1 m/N 
C)  1 kg/m . s 
D)  1 kg/m . s2 
E)  1 N/m . s

Question 7

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 8

A boat floating in fresh water displaces 16,000 N of water. How many newtons of salt-water would it displace if it floats in salt-water of specific gravity 1.17?

Accepted Answer

A)  14,500 
B)  17,600 
C)  16,000 
D)  284 
E)  234 
A)  14,500 
B)  17,600 
C)  16,000 
D)  284 
E)  234

Question 9

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 10

Which of the following statements about Pascal's principle is true?

Accepted Answer

A)  It is valid only for incompressible fluids 
B)  It explains why light objects float 
C)  It explains why the pressure is greater at the bottom of a lake than at the surface 
D)  It is valid only for objects that are less dense than water 
E)  None of the above are true 
A)  It is valid only for incompressible fluids 
B)  It explains why light objects float 
C)  It explains why the pressure is greater at the bottom of a lake than at the surface 
D)  It is valid only for objects that are less dense than water 
E)  None of the above are true

Question 11

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 12

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 13

Gases may be distinguished from other forms of matter by their:

Accepted Answer

A)  lack of color 
B)  small atomic weights 
C)  inability to form free surfaces 
D)  ability to flow 
E)  ability to exert a buoyant force 
A)  lack of color 
B)  small atomic weights 
C)  inability to form free surfaces 
D)  ability to flow 
E)  ability to exert a buoyant force

Question 14

Water flows from a 6.0-cm diameter pipe into an 8.0-cm diameter pipe. The speed in the 6.0-cm pipe is 5.0 m/s. The speed in the 8-inch pipe is:

Accepted Answer

A)  2.8 m/s 
B)  3.7 m/s 
C)  6.6 m/s 
D)  8.8 m/s 
E)  9.9 m/s 
A)  2.8 m/s 
B)  3.7 m/s 
C)  6.6 m/s 
D)  8.8 m/s 
E)  9.9 m/s

Question 15

All fluids are:

Accepted Answer

A)  gases 
B)  liquids 
C)  gases or liquids 
D)  non-metallic 
E)  transparent 
A)  gases 
B)  liquids 
C)  gases or liquids 
D)  non-metallic 
E)  transparent

Question 16

A person blows across the top of one arm of a U-tube partially filled with water. The water in that arm:

Accepted Answer

A)  rises slightly 
B)  drops slightly 
C)  remains at the same height 
D)  rises if the blowing is soft but drops if it is hard 
E)  rises if the blowing is hard but drops if it is soft 
A)  rises slightly 
B)  drops slightly 
C)  remains at the same height 
D)  rises if the blowing is soft but drops if it is hard 
E)  rises if the blowing is hard but drops if it is soft

Question 17

If p is a pressure and $\rho$is a density then p/$\rho$ has units of:

Accepted Answer

A)  m2 
B)  m2/s2 
C)  N/m2 
D)  kg/m2 
E)  m3/kg 
A)  m2 
B)  m2/s2 
C)  N/m2 
D)  kg/m2 
E)  m3/kg

Question 18

An object floats on the surface of a fluid. For purposes of calculating the torque on it, the buoyant force is taken to act at:

Accepted Answer

A)  the center of the bottom surface of the object 
B)  the center of gravity of the object 
C)  the center of gravity of the fluid that the object replaced 
D)  the geometric center of the object 
E)  none of the above 
A)  the center of the bottom surface of the object 
B)  the center of gravity of the object 
C)  the center of gravity of the fluid that the object replaced 
D)  the geometric center of the object 
E)  none of the above

Question 19

Consider a pipe containing a fluid, with the fluid being at rest. To apply Bernoulli's equation to this situation:

Accepted Answer

A)  set v equal to zero because there is no motion 
B)  set g equal to zero because there is no acceleration 
C)  set v and g both equal to zero 
D)  set p equal to the atmospheric pressure 
E)  cannot be done, Bernoulli's equation applies only to fluids in motion 
A)  set v equal to zero because there is no motion 
B)  set g equal to zero because there is no acceleration 
C)  set v and g both equal to zero 
D)  set p equal to the atmospheric pressure 
E)  cannot be done, Bernoulli's equation applies only to fluids in motion

Question 20

A loaded ship passes from a lake (fresh water) to the ocean (salt water). Salt water is more dense than fresh water and as a result the ship will:

Accepted Answer

A)  ride higher in the water 
B)  settle lower in the water 
C)  ride at the same level in the water 
D)  experience an increase in buoyant force 
E)  experience a decrease in buoyant force 
A)  ride higher in the water 
B)  settle lower in the water 
C)  ride at the same level in the water 
D)  experience an increase in buoyant force 
E)  experience a decrease in buoyant force

Exam 14: Fluids

A fluid is undergoing steady flow. Therefore:

A certain object floats in fluids of density Which of the following statements is true?

Mercury is a convenient liquid to use in a barometer because:

The pressure exerted on the ground by a man is greatest when:

1 Pa is:

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:

A boat floating in fresh water displaces 16,000 N of water. How many newtons of salt-water would it displace if it floats in salt-water of specific gravity 1.17?

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

Which of the following statements about Pascal's principle is true?

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:

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:

Gases may be distinguished from other forms of matter by their:

Water flows from a 6.0-cm diameter pipe into an 8.0-cm diameter pipe. The speed in the 6.0-cm pipe is 5.0 m/s. The speed in the 8-inch pipe is:

All fluids are:

A person blows across the top of one arm of a U-tube partially filled with water. The water in that arm:

If p is a pressure and ρ\rhoρ is a density then p/ ρ\rhoρ has units of:

An object floats on the surface of a fluid. For purposes of calculating the torque on it, the buoyant force is taken to act at:

Consider a pipe containing a fluid, with the fluid being at rest. To apply Bernoulli's equation to this situation:

A loaded ship passes from a lake (fresh water) to the ocean (salt water). Salt water is more dense than fresh water and as a result the ship will:

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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:

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:

If p is a pressure and $\rho$ is a density then p/ $\rho$ has units of: