Question 1

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 2

Which of the following is true?

Accepted Answer

A) A streamline can only be defined for irrotational flow. 
B) A streamline cannot be defined for turbulent flow. 
C) Streamlines cannot cross in laminar flow, but can cross in turbulent flow. 
D) A streamline is the path that a tiny element of fluid would take as the fluid flows. 
E) The velocity vector of a fluid element is always perpendicular to the streamline. 
A) A streamline can only be defined for irrotational flow. 
B) A streamline cannot be defined for turbulent flow. 
C) Streamlines cannot cross in laminar flow, but can cross in turbulent flow. 
D) A streamline is the path that a tiny element of fluid would take as the fluid flows. 
E) The velocity vector of a fluid element is always perpendicular to the streamline.

Question 3

Which of the following assumptions is NOT made in the derivation of Bernoulli's equation?

Accepted Answer

A) assume streamline flow 
B) neglect viscosity 
C) neglect friction 
D) neglect gravity 
E) neglect turbulence 
A) assume streamline flow 
B) neglect viscosity 
C) neglect friction 
D) neglect gravity 
E) neglect turbulence

Question 4

An incompressible liquid flows along the pipe as shown.The ratio of the speeds v2/v1 is:

Accepted Answer

A) A1/A2 
B) A2/A1 
C)    
D)    
E) v1/v2 
A) A1/A2 
B) A2/A1 
C)    
D)    
E) v1/v2

Question 5

A blast of wind tips a sailboat in the clockwise direction when viewed from the stern.When the wind ceases the boat rotates back toward the upright position if, when it is tilted, the center of buoyancy:

Accepted Answer

A) is above the center of gravity 
B) is below the center of gravity 
C) is to the right of the center of gravity 
D) is to the left of the center of gravity 
E) coincides with the center of gravity 
A) is above the center of gravity 
B) is below the center of gravity 
C) is to the right of the center of gravity 
D) is to the left of the center of gravity 
E) coincides with the center of gravity

Question 6

A block of ice at 0 ° C is floating on the surface of water in a beaker.The surface of the water just comes to the top of the beaker.When the ice melts the water level will:

Accepted Answer

A) rise and overflow will occur 
B) remain the same 
C) fall 
D) depend on the initial ratio of water to ice 
E) depend on the shape of the block of ice 
A) rise and overflow will occur 
B) remain the same 
C) fall 
D) depend on the initial ratio of water to ice 
E) depend on the shape of the block of ice

Question 7

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 8

Two balls have the same shape and size but one is denser than the other.When they are dropped in air, which has the greater acceleration? Do not ignore air resistance.

Accepted Answer

A) The heavier ball 
B) The lighter ball 
C) They have the same acceleration 
D) The heavier ball if atmospheric pressure is high, they lighter ball if it is low 
E) The lighter ball if atmospheric pressure is high, the heavier ball if it is low 
A) The heavier ball 
B) The lighter ball 
C) They have the same acceleration 
D) The heavier ball if atmospheric pressure is high, they lighter ball if it is low 
E) The lighter ball if atmospheric pressure is high, the heavier ball if it is low

Question 9

The two arms of a U-tube are not identical, one having twice the diameter of the other.A cork in the narrow arm requires a force of 16 N to remove it.The tube is filled with water and the wide arm is fitted with a piston.The minimum force that must be applied to the piston to push the cork out is:

Accepted Answer

A) 4 N 
B) 8 N 
C) 16 N 
D) 32 N 
E) 64 N 
A) 4 N 
B) 8 N 
C) 16 N 
D) 32 N 
E) 64 N

Question 10

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 11

A block of ice at 0 ° C containing a piece of cork is floating on the surface of water in a beaker.When the ice has melted the water level:

Accepted Answer

A) is higher 
B) is lower 
C) is the same 
D) depends on the initial ratio of water to ice 
E) depends on the shape of the ice block 
A) is higher 
B) is lower 
C) is the same 
D) depends on the initial ratio of water to ice 
E) depends on the shape of the ice block

Question 12

A non-viscous incompressible fluid is pumped steadily up a vertical pipe with uniform cross section.The difference in pressure between points at the top and bottom:

Accepted Answer

A) is the same as it would be if the fluid were motionless 
B) is greater at higher flow rates than at lower flow rates 
C) is less at higher flow rates than at lower flow rates 
D) does not depend on the density of the fluid 
E) is zero 
A) is the same as it would be if the fluid were motionless 
B) is greater at higher flow rates than at lower flow rates 
C) is less at higher flow rates than at lower flow rates 
D) does not depend on the density of the fluid 
E) is zero

Question 13

A cork floats on the surface of an incompressible liquid in a container exposed to atmospheric pressure.The container is then sealed and the air above the liquid is evacuated.The cork:

Accepted Answer

A) sinks slightly 
B) rises slightly 
C) floats at the same height 
D) bobs up and down about its old position 
E) behaves erratically 
A) sinks slightly 
B) rises slightly 
C) floats at the same height 
D) bobs up and down about its old position 
E) behaves erratically

Question 14

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 15

Water (density = 1.0 x103 kg/m3)flows through a horizontal tapered pipe.At the wide end its speed is 4.0 m/s.The difference in pressure between the two ends is 4.5 x103 Pa.The speed of the water at the narrow end is:

Accepted Answer

A) 2.6 m/s 
B) 3.2 m/s 
C) 4.0 m/s 
D) 4.5 m/s 
E) 5.0 m/s 
A) 2.6 m/s 
B) 3.2 m/s 
C) 4.0 m/s 
D) 4.5 m/s 
E) 5.0 m/s

Question 16

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 1.10?

Accepted Answer

A) 12,800 N 
B) 14,400 N 
C) 16,000 N 
D) 17,600 N 
E) 19,200 N 
A) 12,800 N 
B) 14,400 N 
C) 16,000 N 
D) 17,600 N 
E) 19,200 N

Question 17

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 18

A wood board floats in fresh water with 60% of its volume under water.The density of the wood is:

Accepted Answer

A) 0.4 g/cm3 
B) 0.5 g/cm3 
C) 0.6 g/cm3 
D) less than 0.4 g/cm3 
E) more than 0.6 g/cm3 
A) 0.4 g/cm3 
B) 0.5 g/cm3 
C) 0.6 g/cm3 
D) less than 0.4 g/cm3 
E) more than 0.6 g/cm3

Question 19

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

Question 20

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

Exam 14: Fluids

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

Which of the following is true?

Which of the following assumptions is NOT made in the derivation of Bernoulli's equation?

An incompressible liquid flows along the pipe as shown.The ratio of the speeds v2/v1 is:

A blast of wind tips a sailboat in the clockwise direction when viewed from the stern.When the wind ceases the boat rotates back toward the upright position if, when it is tilted, the center of buoyancy:

A block of ice at 0 ° C is floating on the surface of water in a beaker.The surface of the water just comes to the top of the beaker.When the ice melts the water level will:

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

Two balls have the same shape and size but one is denser than the other.When they are dropped in air, which has the greater acceleration? Do not ignore air resistance.

The two arms of a U-tube are not identical, one having twice the diameter of the other.A cork in the narrow arm requires a force of 16 N to remove it.The tube is filled with water and the wide arm is fitted with a piston.The minimum force that must be applied to the piston to push the cork out is:

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

A block of ice at 0 ° C containing a piece of cork is floating on the surface of water in a beaker.When the ice has melted the water level:

A non-viscous incompressible fluid is pumped steadily up a vertical pipe with uniform cross section.The difference in pressure between points at the top and bottom:

A cork floats on the surface of an incompressible liquid in a container exposed to atmospheric pressure.The container is then sealed and the air above the liquid is evacuated.The cork:

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

Water (density = 1.0 x103 kg/m3)flows through a horizontal tapered pipe.At the wide end its speed is 4.0 m/s.The difference in pressure between the two ends is 4.5 x103 Pa.The speed of the water at the narrow end is:

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 1.10?

All fluids are:

A wood board floats in fresh water with 60% of its volume under water.The density of the wood is:

A fluid is undergoing steady flow.Therefore:

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

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Filters

An incompressible liquid flows along the pipe as shown.The ratio of the speeds v₂/v₁ is:

Water (density = 1.0 x10³ kg/m³)flows through a horizontal tapered pipe.At the wide end its speed is 4.0 m/s.The difference in pressure between the two ends is 4.5 x10³ Pa.The speed of the water at the narrow end is: