ECAT Physics MCQs

Pressure describes how force is distributed over a surface.
Its SI unit is the pascal.

Mass equals density times volume.
M=800×0.25 = 200 kg.

Pascal's principle is used in hydraulic machines.
The same pressure can produce different forces on different piston areas.

Pressure is force divided by area.
P=100/0.5 = 200 Pa.

Immersion displaces fluid and creates an upward resultant pressure force.
That force equals the displaced fluid's weight.

Force equals pressure times area.
F=5000×0.02 = 100 N.

A floating object displaces enough fluid for buoyancy to equal its weight.
The submerged fraction depends on relative density.

Hydrostatic pressure is ρgh.
P=1000×10×5 = 50,000 Pa.

Torque is rF sinθ.
τ=2×20×sin30° = 20 N·m.

Viscosity represents internal friction between layers.
More viscous fluids resist deformation more strongly.

The pressure is 100/0.01 = 10,000 Pa.
Output force is 10,000×0.20 = 2000 N.

Angular velocity is angular displacement divided by time.
ω=10/2 = 5 rad/s.