WorksheetsFluid Mechanics revision
Total questions: 30
Worksheet time: 3600secs
If a person studies about a fluid which is at rest, what will you call his domain of study?
Fluid Mechanics
Fluid Statics
Fluid Kinematics
Fluid Dynamics
The value of the compressibility of an ideal fluid is
zero
unity
infinity
more than that of a real fluid
The value of the Bulk Modulus of an ideal fluid is
zero
unity
infinity
less than that of a real fluid
Which one of the following is the unit of mass density?
kg = m3
kg = m2
kg = m
kg = ms
The specific gravity of a liquid has
the same unit as that of mass density
the same unit as that of weight density
the same unit as that of specific volume
no unit
Two fluids 1 and 2 have mass densities of p1 and p2 respectively. If p1 > p2, which one of the following expressions will represent the relation between their specific volumes v1 and v2?
v1 > v2
v1 < v2
v1 = v2
Cannot be determined due to insufficient information.
A beaker is filled with a liquid up to the mark of one litre and weighed. The weight of the liquid is found to be 6.5 N. The specific gravity of the liquid will be
0.65
0.66
0.67
0.68
For an incompressible fluid does density vary with temperature and pressure?
It varies for all temperature and pressure range
It remains constant
It varies only for lower values of temperature and pressure
It varies only for higher values of temperature and pressure
The viscosity of a fluid in motion is 1 Poise. What will be it’s viscosity (in Poise) when the fluid is at rest?
0
0.5
1
2
Which of the following is a unit of kinematic viscosity?
Stokes
Pa-s
m2=s
Poise
What will be the diameter (in mm) of a water droplet, the pressure inside which is 0.05 N/cm2 greater than the outside pressure? (Take surface tension as 0.075 N/m)
3
0.3
0.6
6
If a glass tube of 10 mm diameter is immersed in water, what will be the rise or fall in capillary?
(Take surface tension = 0.075 N/m, g = 10 m/s2 and angle of contact = 0)
0.75
1.5
3
6
The device used to measure the fluid pressure is _____________
Hygrometer
Calorimeter
Manometer
Thermometer
A beaker half-filled with water is exposed to the atmosphere. If the pressure at points A, B and C as shown are Pa, Pb and Pc respectively, which one of the following will be the relation connecting the three?
Pa > Pb = Pc
Pa > Pb > Pc
Pa < Pb < Pc
Pa < Pb = Pc
Three beakers 1, 2 and 3 of different shapes are kept on a horizontal table and filled with water up to a height h. If the pressure at the base of the beakers are P1, P2 and P3 respectively, which one of the following will be the relation connecting the three?
P1 > P2 > P3
P1 < P2 < P3
P1 = P2 = P3
P1 > P2 < P3
A simple U tube manometer connected to a pipe in which liquid is flowing with uniform speed will give which kind of pressure?
Absolute Pressure
Vacuum Pressure
Gauge Pressure
Atmospheric pressure
Find the position of 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 id 850 kg/m3 and its length 7.0 m.
0.95
0.85
1.05
1.65
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 mentioned
In stable equilibrium for completely submerged bodies what is the relation between forces?
Buoyancy force= Weight of body,the centre of buoyancy is below the centre of gravity.
Buoyancy force=Weight of body, the centre of buoyancy is above the centre of gravity.
Buoyancy force < Weight of body
Buoyancy force > Weight of body
In a vertically submerged plane surface, pressure at evbery point remains same
True
False
Which method is used in fluid mechanics?
Lagrangian method
Eulerian method
Both Lagrangian and Eulerian methods
Neither Lagrangian nor Eulerian method
A beaker contains water up to a certain height as shown. If the water is allowed to get discharged through a small pipe (of a uniform diameter), what type of flow will it be in the pipe?
steady and uniform
unsteady and uniform
steady and non-uniform
unsteady and non-uniform
A beaker contains water up to a certain height as shown. If the water is allowed to get discharged through a small nozzle, what type of flow will it be in the pipe?
steady and uniform
unsteady and uniform
steady and non-uniform
unsteady and non-uniform
The velocity of a point in a flow is
along the streamline
tangent to the streamline
along the pathline
tangent to the pathline
Two pipes of diameters d1 and d2 converge to form a pipe of diameter 2d. If the liquid flows with a velocity of v1 and v2 in the two pipes, what will be the flow velocity in the third pipe?
v1 + v2
v1 + v2/2
v1 + v2/4
2(v1 + v2)
In a two dimensional flow, the component of the velocity along the X-axis and the Y-axis are u = axy and v = bx2 + cy2. What should be the condition for the flow field to be continuous?
a + b = 0
a + c = 0
a + 2b = 0
a + 2c = 0
In a water supply system, water flows in from pipes 1 and 2 and goes out from pipes 3 and 4 as shown. If all the pipes have the same diameter, which of the following must be correct?
the sum of the flow velocities in 1 and 2 is equal to that in 3 and 4
the sum of the flow velocities in 1 and 3 is equal to that in 2 and 4
the sum of the flow velocities in 1 and 4 is equal to that in 2 and 3
the flow velocities in 1 and 2 is equal to that in 3 and 4
The velocity vector in a fluid is given V=5x4+3y2+2z( in metre/sec). What is the acceleration of it at point (1,3,4) ?
40 m/s2
20 m/s2
60 m/s2
80 m/s2
When fluid element moves from one position to another and it undergoes change in its dimensions, what type of motion is it?
Linear Translation
Linear Deformation
Angular Deformation
Rotation
When external torque is absent the type of vortex flow is
Circular vortex flow
Independent vortex flow
Free vortex flow
Forced vortex flow
