#1
Which of the following best defines buoyancy?
The ability of a fluid to resist flow
The force exerted on an object immersed in a fluid
The upward force exerted by a fluid on an object submerged in it
The tendency of a fluid to rise when heated
#2
Which property of a fluid determines its resistance to flow?
Density
Viscosity
Pressure
Temperature
#3
What is the SI unit of viscosity?
Pascal (Pa)
Newton (N)
Pascal-second (Pa·s)
Newton-second (N·s)
#4
Which fluid property determines whether an object will sink or float in it?
Viscosity
Pressure
Density
Temperature
#5
Which of the following is NOT a unit of pressure?
Pascal (Pa)
Newton (N)
Atmosphere (atm)
Torr (mmHg)
#6
What principle explains why ships float in water?
Bernoulli's principle
Newton's first law
Pascal's principle
Archimedes' principle
#7
How does the buoyant force on an object immersed in a fluid change when it is fully submerged?
It decreases
It increases
It remains the same
It becomes zero
#8
Which of the following factors does NOT affect buoyancy?
Volume of the object
Density of the fluid
Mass of the object
Depth of the fluid
#9
What happens to the pressure in a fluid as depth increases?
It increases
It decreases
It remains constant
It fluctuates
#10
Which law states that the pressure exerted by a confined fluid is transmitted equally in all directions?
Boyle's law
Charles's law
Pascal's law
Gay-Lussac's law
#11
A helium balloon floats in air because:
The balloon's weight is greater than the buoyant force.
The balloon's weight is equal to the buoyant force.
The balloon's weight is less than the buoyant force.
The balloon's weight is irrelevant to its floating.
#12
In a hydraulic lift system, if the area of the smaller piston is 10 cm² and the area of the larger piston is 50 cm², what is the mechanical advantage of the system?
#13
What is the term for the change in pressure experienced by a fluid when its velocity changes?
Bernoulli's effect
Pascal's effect
Archimedes' effect
Newton's effect
#14
A submarine submerges by letting water into its ballast tanks. This process is an application of which principle?
Bernoulli's principle
Archimedes' principle
Pascal's principle
Newton's third law
#15
Why does ice float on water?
Because ice has higher density than water.
Because ice has lower density than water.
Because ice is less buoyant than water.
Because ice is more viscous than water.