Fluid Mechanics
Physics ⇒ Mechanics
Fluid Mechanics starts at 8 and continues till grade 12.
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See sample questions for grade 11
A balloon filled with helium rises in air. Explain why this happens.
A block of wood floats on water. Which force is responsible for keeping it afloat?
A liquid flows through a horizontal pipe. If the pressure at one end is higher than at the other, in which direction does the liquid flow?
Define viscosity.
Describe the difference between laminar and turbulent flow.
A hydraulic press has a small piston of area 0.01 m² and a large piston of area 1 m². If a force of 100 N is applied to the small piston, what is the force exerted by the large piston?
A metal block weighs 50 N in air and 30 N when fully immersed in water. What is the buoyant force acting on the block?
A pipe narrows from a diameter of 10 cm to 5 cm. If the speed of water in the wider section is 2 m/s, what is the speed in the narrower section?
A U-tube contains water and oil. The oil column is 20 cm high and the water column is 10 cm high. If the density of oil is 800 kg/m³ and water is 1000 kg/m³, which side will be higher and by how much?
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 fluids has the highest viscosity at room temperature?
(1) Water
(2) Honey
(3) Alcohol
(4) Air
Which of the following is a correct statement about the continuity equation?
(1) The product of area and velocity is constant for an incompressible fluid.
(2) The sum of pressure and velocity is constant.
(3) The pressure is constant throughout the fluid.
(4) The density is always zero.
Which of the following is NOT a property of an ideal fluid?
(1) Incompressibility
(2) Non-viscosity
(3) Turbulence
(4) Steady flow
A fluid is said to be incompressible if its _______ does not change with pressure.
The capillary rise of a liquid in a tube is due to _______ and _______ forces.
The density of water is _______ kg/m³ at 4°C.
The instrument used to measure atmospheric pressure is called a _______.
True or False: Surface tension is caused by cohesive forces between molecules at the surface of a liquid.
True or False: The density of a floating object is less than the density of the fluid it floats in.
True or False: The pressure at a point in a fluid at rest is the same in all directions.
