Question 1

If pressure drag is acting on an object in moving water

Accepted Answer

A)  The velocity downstream of the object is greater than upstream 
B)  The velocity downstream of the object is always laminar 
C)  The velocity downstream of the object is less than upstream 
D)  None of the above 
A)  The velocity downstream of the object is greater than upstream 
B)  The velocity downstream of the object is always laminar 
C)  The velocity downstream of the object is less than upstream 
D)  None of the above C

Question 2

Bernoulli's principle predicts

Accepted Answer

A)  That pressure varies inversely with flow velocity 
B)  That velocity varies with cross-sectional area 
C)  That pressure near an object increases as water velocity increases 
D)  That small objects sink at constant velocity 
A)  That pressure varies inversely with flow velocity 
B)  That velocity varies with cross-sectional area 
C)  That pressure near an object increases as water velocity increases 
D)  That small objects sink at constant velocity A

Question 3

A bacterium likely lives

Accepted Answer

A)  Under high Reynolds number conditions 
B)  Dominated by inertia 
C)  Dominated by viscosity 
D)  Under conditions only of very low dynamic viscosity 
A)  Under high Reynolds number conditions 
B)  Dominated by inertia 
C)  Dominated by viscosity 
D)  Under conditions only of very low dynamic viscosity C

Question 4

You can reduce drag on a fixed object in a fluid by

Accepted Answer

A)  Increasing the cross-sectional area exposed to the flow 
B)  Decreasing the cross-sectional area exposed to the flow 
C)  Adding projections out from the side to break up the flow 
D)  Changing its density 
A)  Increasing the cross-sectional area exposed to the flow 
B)  Decreasing the cross-sectional area exposed to the flow 
C)  Adding projections out from the side to break up the flow 
D)  Changing its density

Question 5

Skin friction at the surface of a fish can be reduced by

Accepted Answer

A)  Swimming faster 
B)  Swimming slower 
C)  Having an irregular surface with small bumps 
D)  None of the above 
A)  Swimming faster 
B)  Swimming slower 
C)  Having an irregular surface with small bumps 
D)  None of the above

Question 6

In a system of pipes, if water enters the system at a given velocity, what happens if the cross-sectional area triples?

Accepted Answer

A)  Velocity triples 
B)  No effect on velocity 
C)  Velocity decreases to the third power of initial velocity 
D)  Velocity decreases to one-third the initial velocity 
A)  Velocity triples 
B)  No effect on velocity 
C)  Velocity decreases to the third power of initial velocity 
D)  Velocity decreases to one-third the initial velocity

Question 7

Within a boundary layer

Accepted Answer

A)  Flow is always turbulent 
B)  Water velocity is less than in the mainstream 
C)  Water velocity is zero 
D)  Reynolds number is always higher than in the mainstream 
A)  Flow is always turbulent 
B)  Water velocity is less than in the mainstream 
C)  Water velocity is zero 
D)  Reynolds number is always higher than in the mainstream

Question 8

Inertial forces dominate strongly when

Accepted Answer

A)  Re  1000 
D)  Re > 10 
A)  Re  1000 
D)  Re > 10

Question 9

Which of the following is true?

Accepted Answer

A)  Dynamic viscosity of air is greater than water 
B)  Dynamic viscosity increases with increasing temperature 
C)  Dynamic viscosity increases as the size of a particle in a fluid decreases 
D)  None of the above 
A)  Dynamic viscosity of air is greater than water 
B)  Dynamic viscosity increases with increasing temperature 
C)  Dynamic viscosity increases as the size of a particle in a fluid decreases 
D)  None of the above

Question 10

The Reynolds number increases when

Accepted Answer

A)  Water velocity decreases 
B)  Size of the object increases 
C)  Water velocity increases 
D)  Both b and c 
A)  Water velocity decreases 
B)  Size of the object increases 
C)  Water velocity increases 
D)  Both b and c

If pressure drag is acting on an object in moving water

Bernoulli's principle predicts

A bacterium likely lives

You can reduce drag on a fixed object in a fluid by

Skin friction at the surface of a fish can be reduced by

In a system of pipes, if water enters the system at a given velocity, what happens if the cross-sectional area triples?

Within a boundary layer

Inertial forces dominate strongly when

Which of the following is true?

The Reynolds number increases when

Sounding the Deep

The Oceanic Environment

Climate Oscillations and Climate Change

Ecological and Evolutionary Principles of Marine Biology

The Chemical and Physical Environment

Reproduction, Dispersal, and Migration

Plankton

Marine Vertebrates and Other Nekton

The Open Sea: Distributions and Adaptations

Processes in the Water Column

Productivity, Food Webs, and Global Climate Change

Benthic Microorganisms, Seaweeds, and Sea Grasses

The Diversity of Benthic Marine Invertebrates

Benthic Life Habits

The Tidelands: Rocky Shores, Soft-Substratum Shores, Marshes, Mangroves, Estuaries, and Oyster Reefs

The Shallow Coastal Subtidal: Sea Grass Beds, Rocky Reefs, Kelp Forests, and Coral Reefs

Benthos From the Continental Shelf to the Deep Sea

Polar Marine Biology

Biodiversity and Conservation of the Ocean

Fisheries and Food From the Sea

Environmental Impacts of Industrial Activities and Human Populations

Filters

Exam 6: Life in a Fluid Medium

If pressure drag is acting on an object in moving water

Bernoulli's principle predicts

A bacterium likely lives

You can reduce drag on a fixed object in a fluid by

Skin friction at the surface of a fish can be reduced by

In a system of pipes, if water enters the system at a given velocity, what happens if the cross-sectional area triples?

Within a boundary layer

Inertial forces dominate strongly when

Which of the following is true?

The Reynolds number increases when

Sounding the Deep

The Oceanic Environment

Climate Oscillations and Climate Change

Ecological and Evolutionary Principles of Marine Biology

The Chemical and Physical Environment

Reproduction, Dispersal, and Migration

Plankton

Marine Vertebrates and Other Nekton

The Open Sea: Distributions and Adaptations

Processes in the Water Column

Productivity, Food Webs, and Global Climate Change

Benthic Microorganisms, Seaweeds, and Sea Grasses

The Diversity of Benthic Marine Invertebrates

Benthic Life Habits

The Tidelands: Rocky Shores, Soft-Substratum Shores, Marshes, Mangroves, Estuaries, and Oyster Reefs

The Shallow Coastal Subtidal: Sea Grass Beds, Rocky Reefs, Kelp Forests, and Coral Reefs

Benthos From the Continental Shelf to the Deep Sea

Polar Marine Biology

Biodiversity and Conservation of the Ocean

Fisheries and Food From the Sea

Environmental Impacts of Industrial Activities and Human Populations

Filters