conclude and justify whether the flow is laminar or turbulent?

Answer 1

Responder rhsaunders has it right, but he stopped a little too soon. Give him the points. anyway. I had to look it up when he jigged the handle on my memory.
Rn is the product of fluid velocity, pipe diameter and fluid density, divided by its viscosity. The Rn's for fluids were determined experimentally in straight pipe. The upper ( or rising) range of laminar flow is with increasing velocity until Rn = 2700 to above 4000 and laminar flow becomes turbulent. Rn enters into unit friction losses calculations in flowing fluids.
The lower (or dropping) range of critical flow is when velocity diminishes and Rn is 4000 to below 2100. Here turbulence is damped-out by viscosity to become essentially laminar.This is used in fluid dynamics in calculating the arrangements to assure consistency for accurate metering and to determine aerodynamic and hydraulic flow patterns.
As in both ranges , variarions in upstream arrangements of piping and other flow disurbances will effect the numbers.

Answer 2

Calculate the Reynolds number, and that will tell you.

Answer 3

Can u plz post this on http://www.tutorbuddy.org I will answer when you post