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.Management Sciences
Category: Fluid Mechanics
Rain drops are spherical because of__________________?
A. viscosity
B. air resistance
C. surface tension forces
D. atmospheric pressure
E. none of the above
A model of a reservior is drained in 4 mts by opening the sluice gate. The model scale is 1: 225. How long should it take to empty the prototype ?
A. 900 minutes
B. 4 minutes
C. 4 x (225)3/2 minutes
D. 4 (225)1/3 minutes
E. 4 x V225 minutes
Froude number is significant in__________________?
A. supersonics, as with projectile and jet propulsion
B. full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc.
C. simultaneous motion through two fluids where there is a surface of dis-continuity, gravity forces, and wave making effect, as with ship’s hulls
D. all of the above
E. none of the above
Choose the correct relationship ?
A. specific gravity = gravity x density
B. dynamicviscosity = kinematicviscosity x density
C. gravity = specific gravity x density
D. kinematicviscosity = dynamicviscosity x density
E. hydrostaticforce = surface tension x gravity
Poise is the unit of________________?
A. surface tension
B. capillarity
C. viscosity
D. shear stress in fluids
E. buoyancy
Mercury does not wet glass. This is due to property of liquid known as__________________?
A. adhesion
B. cohesion
C. surface tension
D. viscosity
E. compressibility
The fluid forces considered in the Navier Stokes equation are__________________?
A. gravity, pressure and viscous
B. gravity, pressure and turbulent
C. pressure, viscous and turbulent
D. gravity, viscous and turbulent
E. none of the above
Metacentre is the point of intersection of _________________________?
A. vertical upward force through e.g. of body and center line of body
B. buoyant force and the center line of body
C. mid point between e.g. and center of buoyancy
D. all of the above
E. none of the above
The pressure in the air space above an oil (sp. gr. 0.8) surface in a tank is 0.1 kg/cm”. The pressure at 2.5 m below the oil surface will be __________________?
A. 2 metres of water column
B. 3 metres of water column
C. 3.5 metres of water column
D. 4 m of water column
E. none of the above
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