Bennett Mechanical Test Fluid Mechanics and Hydraulics 3

Question 1

Which statement best describes Bernoulli's principle?

Accepted Answer

Faster-moving fluid exerts lower pressure

Answer

Faster-moving fluid exerts higher pressure

Answer

Pressure is unrelated to fluid speed

Answer

Fluid speed depends only on temperature

Question 2

When water flows through a pipe that narrows, the water's speed:

Accepted Answer

Increases

Answer

Decreases

Answer

Stays the same

Answer

Drops to zero

Question 3

As water flows through a narrowing section of pipe, the pressure in that narrow section:

Accepted Answer

Decreases

Answer

Increases

Answer

Doubles exactly

Answer

Is unaffected

Question 4

The continuity equation for fluids states that, for a given pipe, the product of which two quantities stays constant?

Accepted Answer

Cross-sectional area and velocity

Answer

Pressure and temperature

Answer

Density and color

Answer

Length and width

Question 5

Why does the roof of a house sometimes lift off during high winds?

Accepted Answer

Fast wind over the roof lowers pressure above it

Answer

Wind adds weight to the roof

Answer

Air inside the house cools rapidly

Answer

The roof absorbs water

Question 6

A garden hose sprays water farther when you cover part of the opening with your thumb because:

Accepted Answer

Reducing the area increases the exit velocity

Answer

The water becomes lighter

Answer

Pressure inside the hose drops

Answer

The water heats up

Question 7

An atomizer or spray bottle works because air moving quickly past a tube:

Accepted Answer

Creates low pressure that draws liquid up

Answer

Heats the liquid

Answer

Increases the liquid's density

Answer

Freezes the nozzle