Fluid mechanics is a branch of physics that involves which of the following? 1. Hydrodynamics 2. ...

(Answer to Q. 1)  ANS: B
Fluid mechanics deals with the behavior of fluids in motion and involves fluid dynamics. Hy-drodynamics is the study of fluids in motion.

(Answer to Q. 2)  ANS: B
When considering the flow of a liquid through a tube, you should take two factors into consider-ation: the driving pressure forcing the fluid and the resistance the liquid must overcome as it flows. Reynolds suggested that fluid flow becomes turbulent when velocity is increased or when there are changes in fluid density or viscosity and the radius of the tube. The Venturi and Ber-noulli principles deal with the relationship between a liquid's forward velocity and tubular lat-eral-wall pressure.

(Answer to Q. 3)  ANS: B
In laminar flow, the fluid flows in discrete cylindrical layers or streamlines. With turbulent flow, the movement of fluid becomes chaotic. Straight and aerodynamic are not terms that are used to describe the way fluid moves.

(Answer to Q. 4)  ANS: A
Fick's law represents the flow of gases across semipermeable membranes. Henry's law explains the relationship of a gas and a liquid in a combined space. Graham's law involves the relationship of multiple gases placed under the same temperature and pressure, and Charles' law states that the volume of gas varies directly with changes in temperature.

(Answer to Q. 5)  ANS: A
c is the molar concentration (in mol/L) of the dissolved gas.

(Answer to Q. 6)  ANS: C
Graham's law states that when two gases are placed under the same temperature and pressure conditions, the rates of diffusion of the two gases are inversely proportional to the square root of their masses, or , where r1 and r2 represent the diffusion rates of the respective gases, and M1 and M2 are the molar masses. If the mass of a gas is considered directly proportional to its density at a constant temperature and pressure, then 2, where d1 and d2 are the densities of the gases in ques-tion.

What an excellent community, thanks for answering