Mechanical Properties Of Fluid

The relative viscosity of blood remains approximately constant within a certain range of temperatures. For blood, this range is between and , which is close to normal human body temperature. Beyond this temperature range, the viscosity of blood changes significantly.
Therefore, the relative viscosity of blood remains constant between these temperatures.

The correct option is (A) : and

Bernoulli's principle states that for an incompressible, non-viscous fluid, the pressure is lower where the fluid velocity is higher. This principle plays a crucial role in understanding the lift generated by an aeroplane wing. The shape of the wing causes the air to move faster over the top surface, which leads to lower pressure on top of the wing compared to the bottom. This pressure difference creates the upward lift force that allows the aeroplane to fly.
Therefore, the technology related to Bernoulli's principle is used in aeroplanes.

The correct option is (C) : aeroplane