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This quiz contains multiple-choice problems on buoyancy, metacentre and metacentric height, manometer and equilibrium conditions of submerged bodies.
Which of the following cannot be the value of absolute pressure of a fluid at any point?
0
1.013 bar
– 1 bar
200 bar
A manometric liquid should suitably have
Low density and low vapour pressure
Low density and high vapour pressure
High density and low vapour pressure
High density and high vapour pressure
A student wants to find the absolute pressure of water at a point below the water's surface. He has a barometer and a manometer pressure gauge. The barometer reads 1.3152 bar, whereas the manometer pressure gauge reads 0.3152 bar. What is absolute pressure (assuming pressure at one end of the manometer is atmospheric)?
1 bar
1.6304 bar
0.3152 bar
1.3152 bar
Submarines use the principle of ‘neutral buoyancy’ to go into the water. True or false?
True
False
In a U-tube manometer, one end is open to the atmosphere, the other end attached to a pressurized gas of gauge pressure 40 kPa. The height of the fluid column on the atmospheric side is 60 cm, and that on the gas side is 30 cm. The manometric fluid used is (take g = 9.8 m/s2)
Water
Liquid ammonia
Oil
Mercury
In a U-tube mercury manometer, one end is exposed to the atmosphere, and the other is connected to a pressurized gas. The gauge pressure of the gas is found to be 40 kPa. Now we change the manometric fluid to water. The height difference changes by (ρ{mercury} = 13600 kg/m^3, ρwater = 1000 kg/m^3)
1260%
92.64 %
Remains unchanged (0%)
13.6%
A simple U-tube manometer can measure negative gauge pressures. True or false?
True
False
Both ends of a U-tube manometer are exposed to the atmosphere. There exists a possibility that the height difference of the manometer is non-zero. True or false?
True
False
Find the position of the centre of buoyancy for a wooden block of width 3.5 m and depth 1 m, when it floats horizontally in water. The density of wooden block is 850 kg/m^3 and its length is 7.0 m.
0.95
0.85
1.05
1.65
A stone weighs 650 N in air and 275 N in water. Compute its specific gravity.
1.73
2.45
3.46
0.865
What happens to the buoyant force acting on an airship as it rises in the air?
Buoyant force increases
Buoyant force decreases
Buoyant force remains constant
Buoyant force first increases then shows decrease
How can a relatively dense object be made to float on a less dense fluid?
By altering the shape.
By altering the forces acting on the object
By altering the shear forces acting on the object
None of the above
What is the principal cause of action of buoyant force on a body submerged partially or fully in fluid?
Displacement of fluid due to submerged body
Development of force due to dynamic action
Internal shear forces mitigating external forces
None of the above
How does the local pressure vary in a stationary fluid?
With depth only
In the horizontal direction only
Both with depth and along horizontal direction
Neither with depth nor along horizontal direction
A stone weighs 450 N in air and 200 N in water. Compute the volume occupied by the stone.
0.025 m^3
0.05 m^3
0.075 m^3
None of the above
