A. Viscous force acts on any spherical body moving in viscous fluid.
According to Stoke's law,
Viscous force
(F)∝ Coefficient of viscosity
(η) ∝ Radius of body
(R) ∝ Velocity of body
(v) ∴F∝ηRv F=6πnRv ∴ Stokes' law is related with viscous drag
B. Turbulence is related with Reynold's number
If
R<2000→ laminar flow
2000<R<3000→ transition flow (both laminar and turbulent)
R>3000→ Turbulent flow
C. Bernouli's principle According to this principle,
p+ρgh+ρv2= constant where,
p is pressure energy per unit volume,
ρgh is potential energy per unit volume and
ρv2 is
kinetic energy per unit volume.
D. Pascal's law
In closed system, pressure remains same everywhere,
p1=p2 used in hydraulic lift.
Hence,
A→ III, B
→ IV,
C→ I and
D→ II are correct.