If different layers of fluid moves slowly in a single direction, it is known as a laminar flow which can also be called as viscous flow.

Rotameter type viscometers are used for measurement of viscosity and they are working based on the conversion of viscosity to torque.

Hagen-Piossule equation is applied in viscosity measurement using Saybolt viscometer.

Kinematic density is the ratio of absolute viscosity and mass density denoted by ‘ϱ’.

Rotameter viscometer converts viscosity to torque, while all other options are different names of the same viscometer which convert viscosity to pressure.

Newtonian fluids are in which shear stress is proportional to velocity gradient. Velocity gradient is the result of the approach of shear stress and is considered to be the rate of deformation.

Orifice type device is used for measurement of viscosity in which viscosity is converted to pressure change.

Newton’s equation for viscosity connects relation of viscosity and velocity gradient.

As temperature is increased, viscosity of liquid decreases and for gases viscosity increases.

Newtonian fluids are in which shear stress proportional to velocity gradient. Lubricating oils are Newtonian fluid, while all other options represent non-Newtonian fluids.