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

Bernoulli's principle states that as fluid velocity increases, its pressure decreases.

Question 2

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

Accepted Answer

Increases

Answer

By continuity, the same volume passing through a smaller area must move faster.

Question 3

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

Accepted Answer

Decreases

Answer

Faster flow in the narrow section lowers the pressure per Bernoulli's principle.

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

Area × velocity is constant, so flow rate is conserved along the pipe.

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

Fast air over the roof creates lower pressure above, so higher inside pressure pushes it up.

Bennett Mechanical Test Practice Test