Fluid Mechanics
Physics ⇒ Mechanics
Fluid Mechanics starts at 8 and continues till grade 12.
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See sample questions for grade 8
A block of wood floats on water but sinks in oil. Is the density of oil greater or less than that of water?
Describe what happens to the buoyant force on an object as it is lowered deeper into a fluid.
Explain why a steel ship floats on water even though steel is denser than water.
Explain why air pressure decreases as altitude increases.
A container is filled with water to a height of 0.5 m. If the density of water is 1000 kg/m³ and g = 10 m/s², what is the pressure at the bottom of the container?
A cube of side 0.1 m is completely submerged in water. If the density of water is 1000 kg/m³ and g = 10 m/s², what is the buoyant force on the cube?
A sealed syringe filled with water is pressed at one end. The pressure is felt at the other end. This demonstrates which law?
A submarine is at a depth where the water pressure is 2 × 105 Pa. If the area of the hatch is 0.5 m², what is the force on the hatch?
Which of the following best describes viscosity?
(1) The ability of a fluid to flow
(2) The resistance of a fluid to flow
(3) The density of a fluid
(4) The pressure of a fluid
Which of the following best explains why a person feels lighter when swimming in water?
(1) Water is less dense than air
(2) Water exerts an upward buoyant force
(3) Water has high viscosity
(4) Water pressure is low
Which of the following fluids has the highest density?
(1) Water
(2) Air
(3) Mercury
(4) Oil
Which of the following instruments is used to measure atmospheric pressure?
(1) Thermometer
(2) Barometer
(3) Hydrometer
(4) Manometer
A balloon filled with helium rises in air. This is because the density of helium is ________ than that of air.
A hydraulic lift works on the principle of ________'s Law.
A liquid exerts pressure on the walls of its container. This is because the molecules of the liquid are ________ moving.
The density of a fluid is defined as its mass per unit ________.
True or False: Liquids and gases are both considered fluids.
True or False: Objects denser than the fluid they are placed in will float.
True or False: The buoyant force on an object depends on the volume of fluid displaced.
True or False: The pressure at a point in a fluid at rest is the same in all directions.
