Q3: Which of the following statements is incorrect?

a.

A control volume is a fixed amount of matter.

b.

A control volume is a region in space (either fixed or moving)and the boundary of this control volume is called the controlsurface through which matter may or may not enter or exit thecontrol volume

c.

A system is a fixed amount of matter.

d.

It is possible to have a control volume that moves or distortsits shape

Q4:Which of the following statements is incorrect?

a.

For steady flow through a pipe, the rate of change of mass in acontrol volume is zero.

b.

For a rigid stationary wall with zero velocity at theboundary, 𝑣⋅𝑛=0v⋅n=0

c.

The normal vector to the control surface always points into thefluid domain

d.

The normal vector to the control surface always points out ofthe fluid domain