Pakistan MCQs

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

Momentum is p=mv.
P=6×4 = 24 kg·m/s.

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

Impulse equals change in momentum.
J=3(8-2)=18 N·s.

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

Impulse is FΔt for constant force.
50×0.2 = 10 N·s.

Density is mass divided by volume.
ρ=600/0.5 = 1200 kg/m³.

Conserve momentum: 2×6 = (2+4)v.
V=12/6 = 2 m/s.

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

Angular acceleration measures how quickly rotational speed changes.
Its SI unit is rad/s².

Total momentum is 3×4+1×2=14 kg·m/s.
Total mass is 4 kg, so v=3.5 m/s.

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