Hydraulic Fluid Mechanics MCQs

Question 1

A body floats in stable equilibrium

Accepted Answer

When the metancentre is above c.g.

Answer

When its meateentric height is zero

Answer

When its c.g. is below it's centre of buoyancy

Answer

Metacentre has nothing to do with . position of c.g. for determining stability

Question 2

A piece weighing 3 kg in air was found tc weigh 2.5 kg when submerged in water. Its specific gravity is

Accepted Answer

6

Answer

1

Answer

5

Answer

7

Question 3

A square surface 3 m x 3 m lies in a verticnI line in water with its upper edge at water surface. The hydrostatic force on scatare surface is

Accepted Answer

13,500 kg

Answer

9,000 kg

Answer

18,000 kg

Answer

27,000 kg

Question 4

MC depth of the centre of pressure on a vertical rectangular gate 8 in wide and 6 in high, when the water surface coincides with the top of the gates is

Accepted Answer

3.0 m

Answer

2.4m

Answer

4.0 m

Answer

2.5 m

Question 5

If the atmospheric pressure on the surface of an oil tank (sp. gr. 0.8) is 0.2 kg/cm2, the pressure at a depth of 50 in below the oil surface will be

Accepted Answer

6 metres of water column

Answer

2 metres of water column

Answer

3 metres of water column

Answer

5 metres of water column

Question 6

For a body floating in a liquid the normal pressure exerted by the liquid acts at

Accepted Answer

All points on the surface of the body

Answer

Bottom surface of the body

Answer

C.g. of the body

Answer

Metacentre

Question 7

Choose the wrong statement

Accepted Answer

Centre of buoyancy is located above the centre of gravity of the displaced liquid,

Answer

Any weight, floating or immersed in a liquid, is acted upon by a buoyant force

Answer

Buoyant force is equal to the weight of the liquid displaced

Answer

The point through which buoyant force acts is called the centre of buoyancy

Question 8

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

Accepted Answer

Metacentre

Answer

C.g. of body

Answer

Centre of pressure

Answer

Centre of buoyancy

Question 9

Buoyant force is

Accepted Answer

(e) none of the above.

Answer

Resultant force acting on a floating body

Answer

Equal to the volume of liquid displaced

Answer

Force necessary to keep a body in equilibrium the resultant force on a body due to the fluid surrounding it