ECAT Physics MCQs

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

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

Angular acceleration is change in angular velocity over time.
α=(16-4)/3 = 4 rad/s².

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

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

Linear speed is v=rω.
V=0.5×8 = 4 m/s.

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

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

Rotational dynamics gives τ=Iα.
τ=3×4 = 12 N·m.

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

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

Strain compares deformation with original dimension.
It is dimensionless.