Fluid Mechanics
The drag co-efficient for a bacterium moving in water at 1 mm/s, will be of the following order of magnitude (assume size of the bacterium to be 1 micron and kinematic viscosity of water to be 10⁻⁶m²/s).

0.44
24
24000
0.24

ANSWER DOWNLOAD EXAMIANS APP

Fluid Mechanics
The Prandtl mixing length is

Useful for computing laminar flow problems
Independent of radial distance from the pipe axis
Zero at the pipe wall and is a universal constant
Independent of the shear stress

ANSWER DOWNLOAD EXAMIANS APP