GIKI Engineering Computing MCQs

Density measures how much mass is contained in a given volume.
Its SI unit is kg/m³.

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

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

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

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

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

Streamline or laminar flow has ordered layers.
Turbulent flow contains irregular fluctuations and mixing.

Cohesive molecular forces create surface tension.
It makes a liquid surface behave like a stretched membrane.

Elastic deformation is reversible within the elastic limit.
Beyond that limit, permanent deformation may occur.

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

Opposing torques subtract.
The net magnitude is 15-9 = 6 N·m.

Net work equals the change in kinetic energy.
Kf=20+80 = 100 J.