# FLUID MECHANICS MULTIPLE CHOICE QUESTIONS – 7 | GATE | GPSC | ESE | CIVIL ENGINEERING COMPETITIVE EXAMS

1. When the Mach number is between _____ the flow is called super-sonic flow.

[A] 1 and 2.5
[B] 2.5 and 4
[C] 1 and 6
[D] 4 and 6

2. Euler’s dimensionless number relates _____.

[A] Pressure force and inertial force
[B] Inertial force and gravity
[C] Viscous force and inertial force
[D] Viscous force and buoyancy force

3. When a body floating in a liquid, is displaced slightly, it oscillates about _____.

[A] C.G. of body
[B] Center of pressure
[C] Center of buoyancy
[D] Metacentre

4. When a body is placed over a liquid, it will sink down if _____.

[A] Gravitational force is equal to the up-thrust of the liquid
[B] Gravitational force is less than the up-thrust of the liquid
[C] Gravitational force is more than the up-thrust of the liquid
[D] All of the above

5. Coefficient of velocity is defined as the ratio of _____.

[A] Actual discharge through an orifice to the theoretical discharge
[B] Area of jet at vena contracta to the area of orifice
[C] Actual velocity of jet at vena contracta to the theoretical velocity
[D] None of the above