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Fluid Mechanics MCQ 11

1. The specific weight of water in S.I. unit is
2. A body floating in a liquid is said to be in a stable equilibrium, if its metacentre coincides with its centre of gravity.
3. The flow in a pipe is laminar, when Reynold number is less than 2000.
4. The specific weight of sea water is __________ that of pure water.
5. The most economical section of a rectangular channel is one which has hydraulic mean depth or hydraulic radius equal to
6. If a body floating in a liquid occupies a new position and remains at rest in this new position, when given a small angular displacement, The body is said to be in __________ equilibrium.
7. According to Pascal's law, the intensity of pressure at any point in a fluid at rest is the same in all directions.
8. The ratio of velocity of fluid in an undisturbed stream to the velocity of sound wave is known as Mach number.
9. The total energy line lies over the centre line of the pipe by an amount equal to
10. The siphon will work satisfactorily, if the minimum pressure in the pipe is __________ vapour pressure of liquid.
11. The force exerted by a moving fluid on an immersed body is directly proportional to the rate of change of momentum due to the presence of the body. This statement is called
12. The most economical section of a trapezoidal channel is one which has hydraulic mean depth equal to
13. All the gases are considered to have compressible flow and all the liquids are considered to have incompressible flow.
14. A flow is called sub-sonic, if the Mach number is
15. A piezometer tube is used only for measuring
16. The discharge of a depressed nappe is 6 to 7 percent __________ that of a free nappe.
17. An open tank containing liquid is moving with an acceleration on an inclined plane. The inclination of the free surface of the liquid will be __________ to the acceleration of the tank.
18. The ratio of the inertia force to the surface tension force is called Weber's number.
19. Re-entrant or Borda's mouthpiece is an __________ mouthpiece.
20. Euler's number is the ratio of __________ force to pressure force.
Fluid Mechanics MCQ 11
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