Pakistan MCQs

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

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

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

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

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

Buoyant force equals ρVg.
F=1000×0.03×10 = 300 N.

For floating equilibrium, submerged fraction equals object density divided by fluid density.
750/1000 = 0.75.

Volume flow rate is Q=Av.
Q=0.04×3 = 0.12 m³/s.

Stress measures internal force intensity.
It may be tensile, compressive, or shear.

Strain compares deformation with original dimension.
It is dimensionless.

Universal gravitation applies to any pair of masses.
The force acts along the line joining their centers.

Young's modulus measures material stiffness.
A larger value means less strain for a given stress.