CHAPTER # 6: FLUID DYNAMICS 1. The study of properties of fluids in motion is called a) Fluid b) Fluid ...
CHAPTER #
6: FLUID DYNAMICS
1.
The study
of properties of fluids in motion is called
a) Fluid
b) Fluid statics
c) Fluid dynamics
d) None
2.
The
dimensions of coefficient of viscosity are.
a)
ML1T-1
b)
M2L1T1
c)
ML-1T-1
d) M2L-1T-1
3.
Is
denoted for coefficient of:
a)
Friction
b) Viscosity
c) Linear expansion
d) Gravitational customer
4.
The SI
unit of coefficient of viscosity is:
a)
−1 −1
b)
−2 −1
c)
−2 −2
d)
2
5.
An object
moving through a fluid experience a retarding force called
a) Drag force
b) Gravitational force
c) Terminating force
d) Frictional force
6.
The
maximum constant velocity of an object falling vertically downward is called:
a) Final velocity
b) Terminal velocity
c) Initial velocity
d) None of these
7.
The drag
force increases as the speed of the object
a) Increases
b) Decreases
c) Remain constant
d)
None of
these
8.
The
equation = 6is called:
a) Newton’s law
b) Stoke’s law
c) Ohm’s law
d) Lenz’s law
9.
Stokes
law is applicable if body has
__________
shape.
a) Rough
b) Square
c) Circular
d) Spherical
10.
The drag
force F on a sphere of radius r moving slowly with speed v through a fluid of
viscosity is
a)
62
b)
6
c)
6 2
d)
62
11. Drag force is given by
a) Newton’s law
b) Pascal’s law
c) Gauss’s law
d) Stoke’s law
12.
When
weight of an object falling freely becomes equal to the drag force, then the
body will move with
a) Increasing speed
b) Decreasing speed
c) Constant speed
d) None of them
13.
When the
body reaches its terminal velocity, the acceleration of the body becomes
a) Maximum speed
b) Minimum speed
c) Zero
d) Constant quantity
14.
As the
water falls from tap, its speed increases and cross sectional area:
a) Zero
b) Increases
c) Decreases
d) Remains constant
1
15. Terminal velocity is given by equation.
a)
Vt = 2gr2r/9η
b)
Vt = gr2r/9η
c)
Vt = gr2r/9η
d)
Vt = 9gr2r/2η
16.
If radius
of droplet becomes half then its terminal velocity will be
a) Half
b) Double
c) One forth
d) Four times
17. Turbulent flow is:
a) Unsteady and regular
b) Steady and regular
c) Unsteady and irregular
d) Steady and regular
18. The flow of ideal fluid is always:
a) Turbulent
b) Streamline
c) Irregular
d) Straight line
19. Irregular flow of fluid is called:
a) Streamline
b) Turbulent
c) Uniform
d) Laminar
20.
According
to equation of continuity, A1V1 = A2V2 = constant. The constant is equal to:
a) Flow rate
b) Volume of fluid
c) Mass of fluid
d) Density of fluid
21.
Equation
of continuity is obtained by applying law of conservation of
a) Mass
b) Energy
c) Momentum
d) All
22.
If
cross-sectional area of pipe decreases, the speed of fluid must increase
according to:
a) Venturi relation
b) Bernoulli’s equation
c) Equation of continuity
d) Torricelli’s theorem
23.
In
equation of continuity, the units of Av is given as:
a) Cubic meter
b) Cubic meter per second
c) Square meter per second
d) Square meter
24. The law of conservation of mass gives:
a) Bernoulli’s equation
b) Equation of continuity
c) Torricelli theorem
d) None of these
25. Bernoulli’s theorem applies to:
a) Solids
b) Plasma state
c) Fluids
d) Liquids
26.
Velocity
of fluid increases where the pressure is:
a) Low
b) High
c) Constant
d) Changes continuously
27.
Speed of
efflux can be determined by applying:
a) Pressure-velocity relationship
b) Torricelli’s theorem
c) Venture relation
d) All
28. Venturi meter is a device used to measure:
a) Pressure of the fluid
b) Speed of fluid
c) Density of fluid
d) Viscosity of the fluid
29. A man standing near a fast moving train may fall.
a) Away from the train
b) Towards the train
c) On himself
d) None of
these
30. Bernoulli’s equation is
obtained by applying law of
conservation of.
a) Mass
b) Energy
c) Momentum
d) Fluid
31. Ideal fluid is.
a) Non-viscous
b) Incompressible
c) Steady flow
d) Possess
all properties
32. Velocity of efflux is measured by relation
a)
|
|||
â„Ž
|
|||
b)
|
â„Ž
|
||
2
|
|||
c)
|
|||
2
â„Ž
|
|||
d)
|
4
â„Ž
|
||
3
|
|||
33.
The
mathematical relation =
2 â„Ž2 − â„Ž1 is known
as:
a)
Equation
of continuity
b) Torricelli’s theorem
c) Bernoulli’s equation
d) Ventra relation
34. Swing is produced to:
a) Increase the speed of ball
b) Decrease the speed of ball
c) Deceive the player
d) Applying the force on the ball
35. The blood pressure in the vessels is always
a) Less than atmosphere
b) Greater than atmosphere
c) Equal to atmosphere
d)
133.32
36.
Instrument
used to measure blood pressure is called
a) Venturi meter
b) Blood pressure
c) Sphygmomanometer
d) Sonometer
37.
One Torr
is expressed in−2 as:
a)
133.3−2
b)
13.33−2
c)
1333−2
d)
1.333−2
38.
Blood has
density equal to that of:
a) Mercury
b) Sodium
c) Honey
d) Water
39.
For which
position, blood pressure in the body have the smallest value?
a) Standing straight
b) Sitting on chair
c) Sitting on ground
d) Lying horizontally
Q No.
|
Ans.
|
Q No.
|
Ans.
|
Q No.
|
Ans.
|
|
1
|
c
|
14
|
c
|
27
|
b
|
|
2
|
c
|
15
|
a
|
28
|
b
|
|
3
|
b
|
16
|
c
|
29
|
b
|
|
4
|
a
|
17
|
c
|
30
|
b
|
|
5
|
a
|
18
|
b
|
31
|
d
|
|
6
|
b
|
19
|
b
|
32
|
c
|
|
7
|
a
|
20
|
a
|
33
|
b
|
|
8
|
b
|
21
|
a
|
34
|
c
|
|
9
|
d
|
22
|
c
|
35
|
b
|
|
10
|
b
|
23
|
b
|
36
|
c
|
|
11
|
d
|
24
|
b
|
37
|
a
|
|
12
|
c
|
25
|
c
|
38
|
d
|
|
13
|
c
|
26
|
a
|
39
|
d
|
|
COMMENTS