Fluid Mechanics
Physics ⇒ Mechanics
Fluid Mechanics starts at 8 and continues till grade 12.
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See sample questions for grade 9
A balloon filled with helium rises in air. Explain why.
A block of wood floats on water but sinks in oil. Is the density of oil greater or less than that of water?
A cube of side 0.1 m is completely submerged in water. What is the volume of water displaced?
A stone weighs 10 N in air and 6 N when fully immersed in water. What is the buoyant force acting on the stone?
Define density.
Describe the difference between absolute pressure and gauge pressure.
Explain why a steel needle sinks in water but a ship made of steel floats.
Explain why atmospheric pressure decreases with altitude.
Explain why it is easier to cut vegetables with a sharp knife than with a blunt one, in terms of pressure.
If a force of 200 N is applied over an area of 0.5 m², what is the pressure exerted?
If a swimmer is 5 m below the surface of a lake (density = 1000 kg/m³), what is the pressure due to the water at that depth? (Take g = 10 m/s²)
If the density of a liquid is 800 kg/m³ and the height of the liquid column is 2 m, what is the pressure at the bottom? (Take g = 10 m/s²)
If the mass of a liquid is 500 g and its volume is 250 cm³, what is its density in kg/m³?
State Archimedes' Principle.
State Pascal's Law.
What is the density of water in kg/m³?
What is the effect of increasing temperature on the viscosity of a liquid?
What is the formula for pressure?
Which law explains why a hydraulic lift works?
A cylindrical tank of radius 0.5 m is filled with water to a height of 2 m. Calculate the total force exerted by the water on the bottom of the tank. (Take density of water = 1000 kg/m³, g = 10 m/s²)
