Embibe Experts Solutions for Chapter: Fluid Mechanics, Exercise 7: Exercise (Assertion & Reason)

Assertion : The velocity of horizontal flow of a ideal liquid is smaller where pressure is large and vise versa.
Reason : According to Bemoullis theorem for the stream line flow of an ideal liquid, the total energy per unit mass remains constant.

Assertion: The shape of an automobile is so designed that its front resembles the streamline pattern of the fluid through which it moves.

Reason: The shape of the automobile is made streamlined in order to reduce resistance offered by the fluid.

Assertion: For Reynold number $\mathrm{Re}>2000$, the flow of fluid is turbulent.

Reason: Inertial forces are dominant compared to the viscous forces at such high Reynold numbers.

Assertion: Turbulence is always dissipative.

Reason: High Reynold number promotes turbulence.

Assertion: Gases also behave as fluids.

Reason: Gas molecules are bounded by cohesive forces.

Assertion: Under steady flow, the velocity of the particle of fluid is not constant at a point.

Reason: Ideal fluids are compressible.

Assertion: Pressurized fluid contains energy.

Reason: Work must be done to compress fluids.

Assertion: Bernoulli’s theorem holds true for ideal fluids in laminar flow.

Reason: In laminar flow, viscous force is not exerted.