Fluid Mechanics
Physics ⇒ Mechanics
Fluid Mechanics starts at 8 and continues till grade 12.
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See sample questions for grade 12
A fluid exerts pressure in all directions at a point. This is a consequence of which property of fluids?
Define the term 'incompressible fluid'.
Describe the capillary action observed when a thin tube is dipped into water.
Explain the difference between laminar and turbulent flow.
A ball of mass 0.2 kg and volume 2.5 × 10⁻⁴ m³ is completely immersed in water. What is the magnitude of the buoyant force acting on it? (Density of water = 1000 kg/m³, g = 9.8 m/s²)
A block of wood floats on water with 60% of its volume submerged. What is the density of the wood if the density of water is 1000 kg/m³?
A hydraulic press has a small piston of area 0.01 m² and a large piston of area 0.5 m². If a force of 200 N is applied to the small piston, what is the force exerted by the large piston?
A liquid flows through a horizontal pipe that narrows from a cross-sectional area of 0.05 m² to 0.01 m². If the speed of the liquid in the wider section is 2 m/s, what is its speed in the narrower section?
Which law explains why a ship floats on water?
(1) Newton's First Law
(2) Archimedes' Principle
(3) Bernoulli's Principle
(4) Pascal's Law
Which of the following best describes surface tension?
(1) The force per unit area exerted by a fluid
(2) The energy required to increase the surface area of a liquid by a unit amount
(3) The resistance to flow in a fluid
(4) The upward force on a submerged object
Which of the following is NOT a property of an ideal fluid?
(1) Incompressibility
(2) Non-viscosity
(3) Surface tension
(4) Irrotational flow
Which of the following is NOT an assumption of Bernoulli's equation?
(1) The fluid is incompressible.
(2) The flow is steady.
(3) The fluid is non-viscous.
(4) The fluid is heated.
The continuity equation for an incompressible fluid is given by ________.
The pressure at a depth h in a liquid of density ρ under gravity g is given by the formula ________.
The property of a fluid that enables it to return to its original shape after being deformed is called ________.
The Reynolds number is used to predict whether the flow of a fluid will be ________ or ________.
True or False: Bernoulli's equation is valid for all types of fluid flow, including viscous and turbulent flows.
True or False: The density of a fluid is defined as its mass per unit volume.
True or False: The pressure at a point in a fluid at rest is the same in all directions.
True or False: The pressure inside a soap bubble is greater than the pressure outside it.
