OAR OAR Mechanical Comprehension: Fluids 3

Question 1

A submarine descends from 100 ft to 200 ft below sea water. What happens to the pressure on its hull?

Accepted Answer

Pressure increases but does not double because surface pressure already exists

Answer

Pressure doubles

Answer

Pressure stays the same

Answer

Pressure halves

Question 2

Which property of a fluid describes its resistance to flow?

Accepted Answer

Viscosity

Answer

Density

Answer

Surface tension

Answer

Compressibility

Question 3

Water flows at 3 ft/s through a pipe with a 6 in² cross-section. What is the volumetric flow rate?

Accepted Answer

0.125 ft³/s

Answer

0.5 ft³/s

Answer

18 ft³/s

Answer

2 ft³/s

Question 4

A sealed container is partially filled with water and then heated. What happens to the pressure inside?

Accepted Answer

Pressure increases because water vapor pressure rises

Answer

Pressure decreases because water expands

Answer

Pressure remains constant

Answer

Pressure fluctuates randomly

Question 5

Two connected tanks at the same elevation are filled with water. If Tank A has a larger cross-sectional area than Tank B, at equilibrium the water level in each tank is:

Accepted Answer

Equal in both tanks

Answer

Higher in the larger tank A

Answer

Higher in the smaller tank B

Answer

Dependent on which tank was filled first

Question 6

What does a manometer measure?

Accepted Answer

Pressure difference between two points

Answer

Fluid velocity

Answer

Fluid temperature

Answer

Volumetric flow rate

Question 7

An object submerged in water weighs 10 lbs when measured underwater and 25 lbs when measured in air. What is the buoyant force?

Accepted Answer

15 lbs

Answer

10 lbs

Answer

25 lbs

Answer

35 lbs