P7 Mekanika Fluida

What is the SI unit of pressure?

• Pascal (Pa)

• Newton (N)

• Joule (J)

• Watt (W)

According to Archimedes' principle, what determines the buoyant force acting on an object that is submerged in a fluid?

• The volume of the fluid displaced

• The weight of the object

• The density of the object

• The shape of the object

Which equation expresses the principle of continuity in fluid mechanics?

• P+12ρv2+ρgh=constant

• A1v1=A2v2

• F=ρgV

• W=PΔV

Bernoulli's equation is a statement of which fundamental principle?

• Conservation of mass

• Conservation of energy

• Newton's second law

• Conservation of momentum

What happens to the pressure of a liquid as depth increases?

• It decreases

• It remains constant

• It increases

• It depends on the liquid's viscosity

If the diameter of a pipe is reduced by half, how does the velocity of the fluid change, assuming incompressible flow?

• It becomes four times faster

• It becomes twice as fast

• It remains the same

• It becomes half as fast

Why does an airplane wing generate lift according to Bernoulli's principle?

• The pressure is the same on both sides of the wing

• Air moves faster over the top of the wing, decreasing pressure

• The wing shape has no effect on air pressure

• The lift force is generated only due to air density

A hydraulic lift has a small piston with an area of 0.01 m² and a large piston with an area of 1.0 m². If a force of 100 N is applied to the small piston, what force is exerted by the large piston?

• 100 N

• 500 N

• 1000 N

• 10,000 N

Why does a person feel lighter when swimming in water?

• Water exerts a downward force on the body

• The density of the body increases in water

• A buoyant force opposes the person's weight

• The person's mass decreases in water

Two identical containers are filled with different fluids, one with water and the other with mercury. At the same depth, how does the pressure in the mercury-filled container compare to that in the water-filled container?

• The same in both containers

• Higher in the mercury-filled container

• Lower in the mercury-filled container

• It depends on the volume of the liquid