Fluids Practice — Pressure, Buoyancy and Bernoulli
10 problems · instant feedback · full explanations
Fluids push on everything they touch. Track pressure differences and you can predict buoyancy, flow speeds and lift. Remember: pressure is force per area, and faster flow means lower pressure.
Q1.
What is the SI unit of pressure?
Multiple choice · Easy
Q2.
A force of 500 N acts on an area of 0.25 m². What is the pressure?
Numerical answer (Pa) · Easy
Q3.
What is the absolute pressure 10 m below the surface of the sea? (P_atm = 101325 Pa, ρ = 1000 kg/m³, g = 9.8 m/s²)
Numerical answer (Pa) · Medium
Q4.
According to Archimedes' principle, the buoyant force on a submerged object equals:
Multiple choice · Medium
Q5.
True or false: a steel ship floats because steel is less dense than water.
True / False · Easy
Q6.
A submerged object displaces 0.5 m³ of water. What is the buoyant force on it? (ρ = 1000 kg/m³, g = 9.8 m/s²)
Numerical answer (N) · Medium
Q7.
According to Bernoulli's principle, where a fluid flows faster, its pressure is:
Multiple choice · Medium
Q8.
Water flows at 1.5 m/s through a pipe of cross-section 0.02 m², then enters a narrower section of 0.01 m². What is the speed there?
Numerical answer (m/s) · Hard
Q9.
True or false: pressure in a static fluid acts equally in all directions at a given point.
True / False · Medium
Q10.
In a hydraulic lift, 100 N is applied to a 0.01 m² piston. What force appears on the 0.5 m² platform piston?
Multiple choice · Hard