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Fluid Mechanics revision

Total questions: 30

Worksheet time: 3600secs

Name
Class
Date
1.

If a person studies about a fluid which is at rest, what will you call his domain of study?

a)

Fluid Mechanics

b)

Fluid Statics

c)

Fluid Kinematics

d)

Fluid Dynamics

2.

The value of the compressibility of an ideal fluid is

a)

zero

b)

unity

c)

infinity

d)

more than that of a real fluid

3.

The value of the Bulk Modulus of an ideal fluid is

a)

zero

b)

unity

c)

infinity

d)

less than that of a real fluid

4.

Which one of the following is the unit of mass density?

a)

kg = m3

b)

kg = m2

c)

kg = m

d)

kg = ms

5.

The specific gravity of a liquid has

a)

the same unit as that of mass density

b)

the same unit as that of weight density

c)

the same unit as that of specific volume

d)

no unit

6.

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?

a)

v1 > v2

b)

v1 < v2

c)

v1 = v2

d)

Cannot be determined due to insufficient information.

7.

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

a)

0.65

b)

0.66

c)

0.67

d)

0.68

8.

For an incompressible fluid does density vary with temperature and pressure?

a)

It varies for all temperature and pressure range

b)

It remains constant

c)

It varies only for lower values of temperature and pressure

d)

It varies only for higher values of temperature and pressure

9.

The viscosity of a fluid in motion is 1 Poise. What will be it’s viscosity (in Poise) when the fluid is at rest?

a)

0

b)

0.5

c)

1

d)

2

10.

Which of the following is a unit of kinematic viscosity?

a)

Stokes

b)

Pa-s

c)

m2=s

d)

Poise

11.

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)

a)

3

b)

0.3

c)

0.6

d)

6

12.

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)

a)

0.75

b)

1.5

c)

3

d)

6

13.

The device used to measure the fluid pressure is _____________

a)

Hygrometer

b)

Calorimeter

c)

Manometer

d)

Thermometer

14.

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?

a)

Pa > Pb = Pc

b)

Pa > Pb > Pc

c)

Pa < Pb < Pc

d)

Pa < Pb = Pc

15.

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?

a)

P1 > P2 > P3

b)

P1 < P2 < P3

c)

P1 = P2 = P3

d)

P1 > P2 < P3

16.

A simple U tube manometer connected to a pipe in which liquid is flowing with uniform speed will give which kind of pressure?

a)

Absolute Pressure

b)

Vacuum Pressure

c)

Gauge Pressure

d)

Atmospheric pressure

17.

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.

a)

0.95

b)

0.85

c)

1.05

d)

1.65

18.

What is the principal cause of action of buoyant force on a body submerged partially or fully in fluid?

a)

Displacement of fluid due to submerged body

b)

Development of force due to dynamic action

c)

Internal shear forces mitigating external forces

d)

None of the mentioned

19.

In stable equilibrium for completely submerged bodies what is the relation between forces?

a)

Buoyancy force= Weight of body,the centre of buoyancy is below the centre of gravity.

b)

Buoyancy force=Weight of body, the centre of buoyancy is above the centre of gravity.

c)

Buoyancy force < Weight of body

d)

Buoyancy force > Weight of body

20.

In a vertically submerged plane surface, pressure at evbery point remains same

a)

True

b)

False

21.

Which method is used in fluid mechanics?

a)

Lagrangian method

b)

Eulerian method

c)

Both Lagrangian and Eulerian methods

d)

Neither Lagrangian nor Eulerian method

22.

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?

a)

steady and uniform

b)

unsteady and uniform

c)

steady and non-uniform

d)

unsteady and non-uniform

23.

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?

a)

steady and uniform

b)

unsteady and uniform

c)

steady and non-uniform

d)

unsteady and non-uniform

24.

The velocity of a point in a flow is

a)

along the streamline

b)

tangent to the streamline

c)

along the pathline

d)

tangent to the pathline

25.

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?

a)

v1 + v2

b)

v1 + v2/2

c)

v1 + v2/4

d)

2(v1 + v2)

26.

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)

a + b = 0

b)

a + c = 0

c)

a + 2b = 0

d)

a + 2c = 0

27.

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?

a)

the sum of the flow velocities in 1 and 2 is equal to that in 3 and 4

b)

the sum of the flow velocities in 1 and 3 is equal to that in 2 and 4

c)

the sum of the flow velocities in 1 and 4 is equal to that in 2 and 3

d)

the flow velocities in 1 and 2 is equal to that in 3 and 4

28.

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) ?

a)

40 m/s2

b)

20 m/s2

c)

60 m/s2

d)

80 m/s2

29.

When fluid element moves from one position to another and it undergoes change in its dimensions, what type of motion is it?

a)

Linear Translation

b)

Linear Deformation

c)

Angular Deformation

d)

Rotation

30.

When external torque is absent the type of vortex flow is

a)

Circular vortex flow

b)

Independent vortex flow

c)

Free vortex flow

d)

Forced vortex flow