zone of action

zone of silence

control volume

none of the above

Critical point

Vena contracta

Stagnation point

None of these

the temperature at zero velocity

the temperature at zero pressure

the temperature at zero heat transfer

tx`he temperature at zero volume

Mach number

Pressure

Square root of temperature

None of the above

inversely as bulk modulus

directly as the absolute pressure

inversely as the absolute temperature

none of the above

gradually decreasing area

converging-diverging passage

constant area throughout its length

diverging-converging passage

$\frac{dA}{A}=\frac{dV}{V}\left(1-M^2\right)$

$\frac{dA}{A}=\frac{dV}{V}\left(C^2-1\right)$

$\frac{dA}{A}=\frac{dV}{V}\left(M^2-1\right)$

$\frac{dA}{A}=\frac{dV}{V}\left(1-V^2\right)$

Water

Steel

Kerosene

Air

$\frac{K}{\rho }$

$\sqrt{\gamma RT}$

$\sqrt{K\frac{p}{\rho }}$

$\sqrt{\frac{dp}{d\rho }}$

$\frac{dV}{V}+\frac{d\rho }{\rho }+\frac{dA}{A}=0$

$VdV+\frac{dp}{\rho }=0$

$2VdV+\frac{dp}{\rho }=0$

$dp+d\left(\rho V^2\right)=0$