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 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 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?
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?
Define viscosity.
Describe the difference between laminar and turbulent flow.
Explain why a steel needle floats on water but a steel ball of the same mass sinks.
Explain why atmospheric pressure decreases with altitude.
If the velocity of a fluid increases, what happens to its pressure according to Bernoulli's principle?
State Bernoulli's principle.
State Pascal's law.
