A. 900 minutes

B. 4 minutes

C. 4 x (225)3/2 minutes

D. 4 (225)1/3 minutes

**E. 4 x V225 minutes**

# Fluid Mechanics

## 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

## Density of water is maximum at__________________?

A. 0°C

B. 0°K

**C. 4°C**

D. 100°C

E. 20°C.

## 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

## A square surface 3 m x 3 m lies in a vertical line in water pipe its upper edge at water surface. The hydrostatic force on square surface is____________________?

A. 9,000 kg

**B. 13,500 kg**

C. 18,000 kg

D. 27,000 kg

E. 30,000 kg