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

Total pressure = atmospheric + hydrostatic; doubling depth doubles only the hydrostatic component, so total pressure increases but does not double.

Question 2

Which property of a fluid describes its resistance to flow?

Accepted Answer

Viscosity

Answer

Viscosity is the measure of a fluid's internal friction and resistance to deformation or flow.

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

Q = A × v = (6/144 ft²) × 3 ft/s = 0.125 ft³/s (convert 6 in² to ft²).

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

Heating increases vapor pressure and thermal expansion in a sealed container, raising internal pressure.

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

Connected static fluids of the same type reach equal heights regardless of tank size (hydrostatic equilibrium).

OAR Test Practice Test

OAR Test Practice Test

OAR OAR Mechanical Comprehension: Fluids 3