OAR OAR Mechanical Comprehension: Fluids Questions and Answers 2

Question 1

A hydraulic jack has a small piston with an area of 2 sq in and a large piston with an area of 20 sq in. If 10 lb of force is applied to the small piston, what force is exerted by the large piston?

Accepted Answer

100 lb

Answer

200 lb

Answer

20 lb

Answer

50 lb

Question 2

What happens to the buoyant force on a fully submerged object as it is pushed deeper into a fluid of uniform density?

Accepted Answer

It remains the same

Answer

It increases

Answer

It decreases

Answer

It doubles

Question 3

Water flows through a horizontal pipe that narrows from a diameter of 4 cm to 2 cm. How does the flow velocity change in the narrow section?

Accepted Answer

It quadruples

Answer

It doubles

Answer

It stays the same

Answer

It halves

Question 4

A submarine's hull must withstand greater pressure at deeper depths primarily because of which factor?

Accepted Answer

The increasing weight of the water column above it

Answer

The temperature of the water

Answer

The salinity of the ocean

Answer

The speed of ocean currents

Question 5

An object with a density of 0.6 g/cm³ is placed in water (density 1.0 g/cm³). What fraction of the object's volume will be submerged?

Accepted Answer

60%

Answer

40%

Answer

100%

Answer

50%

Question 6

In a venturi meter, what happens to the fluid pressure in the constricted (narrow) section compared to the wider section?

Accepted Answer

Pressure decreases

Answer

Pressure increases

Answer

Pressure stays the same

Answer

Pressure fluctuates randomly