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Fluid Mechanics MCQ Test 2

Total questions: 64

Worksheet time: 40mins

Name
Class
Date
1.

Pascal's Law states that

a)

any pressure applied to the surface of a fluid is transmitted uniformly throughout the fluid in all directions

b)

any pressure applied to the volume of a fluid is transmitted uniformly throughout the fluid in all directions

c)

any pressure applied to the surface of a fluid is transmitted not uniformly throughout the fluid in all directions

d)

any pressure applied to the surface of a fluid is transmitted uniformly throughout the fluid in any directions

2.

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

3.

If cross-sectional area of pipe decreases, the speed of fluid must increase according to:

a)

Continuity equation

b)

Bernoulli's equation

c)

Torricelli's theorem

d)

Venture relation

4.

Laminar flow is

a)

Unsteady and regular

b)

Steady and regular

c)

Unsteady and irregular

d)

Chaotic

5.

Friction factor depends on

a)

Reynolds number

b)

diameter of pipe

c)

roughness of pipe material

d)

all of above

6.

A force of 30.0 N is exerted on a small piston of the hydraulic system. The cross-sectional area of the small piston is 0.05 m2 and that of the large piston is 0.10 m2. The weight of the object that the large piston can lift is ____.

a)

60 N

b)

40 N

c)

100 N

d)

150 N

7.

A dam is constructed with wider and thicker base. Why is it wider and thicker at the base than at the top?

a)

Much water is at the base than at the top.

b)

Water is heavier at the base than at the top.

c)

Liquid pressure is greater at the base than at the top.

d)

It is easier to construct a structure with wider base & narrow top.

8.

If an object has a volume of 10 mL and a mass of 20 g, what is its density?

a)

.5 g/mL

b)

200 g/mL

c)

2 g/mL

9.

The magnitude of the buoyant force is equal to the weight of fluid displaced by the object _____.

a)

for every object submerged partially or completely in a fluid

b)

only for an object that floats

c)

only for an object that sinks

d)

for no object submerged in a fluid

10.

What is an ideal fluid?

a)

A fluid which has no viscosity

b)

A fluid which is incompressible

c)

A fluid which has no surface tension

d)

All of the above

11.

The study of properties of fluids in motion is called

a)

Fluids Study

b)

Fluids statics

c)

Fluids dynamics

d)

None

12.

The dimensions of coefficient of viscosity is:

a)

ML1T-2

b)

M2L1T1

c)

ML-1T-1

d)

ML-1T-2

13.

An object moving through a fluid experience a retarding force called:

a)

Drag force

b)

Gravitational force

c)

Terminating force

d)

Frictional force

14.

As the water falls from tap, its speed increases and cross sectional area:

a)

Decreases

b)

Increases

c)

become zero

d)

becomes Constant

15.

Venturi meter is a device used to measure:

a)

Pressure of the fluid

b)

Viscosity of the fluid

c)

Velocity of the fluid

d)

Density of the fluid

16.

Bernoulli’s equation is obtained by applying law of conservation of.

a)

Mass

b)

Energy

c)

Momentum

d)

Force

17.
Archimedes' Principle states that... 
a)
The buoyant force acting on an object equals the volume of the fluid displaced by the object. 
b)
The buoyant force acting on an object equals the weight (force of gravity) of the fluid displaced by the object.
c)
The buoyant force acting on an object will always be equal. 
18.

Water is a

a)

Compressible liquid

b)

Incompressible liquid

19.

2000<Reynold Number< 4000

a)

Laminar Flow

b)

Turbulent Flow

c)

Transition Flow

d)

Super Hulk Flow

20.

Reynold number less than 2000

a)

Laminar Flow

b)

Transition Flow

c)

Turbulent Flow

d)

Spider flow

21.

Another name for laminar flow

a)

Eddie flow

b)

Zig Zag flow

c)

Streamline flow

d)

None of the above

22.

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

23.

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

24.

What happens to viscosity in the case of incompressible fluids as temperature is increased?

a)

It remains constant

b)

It increases

c)

It decreases

d)

None of the mentioned

25.

Which of the following contribute to the reason behind the origin of surface tension?

a)

only cohesive forces

b)

only adhesive forces

c)

neither cohesive forces nor adhesive forces

d)

both cohesive forces and adhesive forces

26.

The imaginary line drawn in the fluid in such a way that the tangent to any point gives the direction of motion at the point, is called as

a)

path line

b)

streak line

c)

filament line

d)

stream line

27.

In which method of describing fluid motion, the observer remains stationary and observes changes in the fluid parameters at a particular point only?

a)

Lagrangian method

b)

Eulerian method

c)

Stationary method

d)

All of the above

28.

Calculation of water pressure force on dam is the problem of

a)

Statics

b)

Kinetics

c)

Kinematics

d)

Dynamics

29.

Pitot tube measures

a)

atmispheric pressure

b)

Pressure in a car tyre

c)

velocity of flow

d)

piezometric pressure

30.

Coefficient of discharge of a venturimeter is

a)

1.1

b)

9.81

c)

0.9

d)

.5

31.

Locus of all points emerging from single reference point known as

a)

streamline

b)

path line

c)

equipotential line

d)

streak line

32.

The unit of kinematic viscosity is

a)

Pa.s

b)

Sq.m per sec

c)

Pa.sec / sq. m

d)

Kg.sec sq. / sq. m

33.

The constant discharge passing through an uniform dia. pipe is

a)

Unsteady uniform

b)

nonuniform unsteady

c)

uniform steady

d)

Laminar flow

34.

Poise is the unit of

a)

Mass density

b)

Kinematic viscosity

c)

viscosity

d)

velocity gradient

35.

A Newtonion fluid is defined as the fluid which

a)

is incompatible and non-viscous

b)

Obeys Newton's law of viscosity

c)

is higly viscous

d)

is compressible and viscous

36.

Which of the following represent the major energy loss

a)

Bend in pipe

b)

Pipe fittings

c)

Sudden exoansion

d)

Friction loss

37.

Fluids consist of

a)

solids and liquids

b)

gases

c)

gases and liquids

d)

gases and solids

38.

The maximum contraction takes place at a section slightly on the downstream side of the orifice. This is section is knows as (a)  

39.
The upward force exerted by a fluid on a submerged object.
a)
gravity
b)
anti-gravity
c)
buoyant force
d)
lift
40.
The rule that when force is applied to a confined fluid, the increase in pressure is transmitted equally throughout.
a)
pascal's principle
b)
bernoulli's principle
c)
archimedes' principle
d)
Newton's Law
41.
An object is buoyed up when
a)
the buoyant force is less than the object's weight.
b)
the buoyant force is greater than the object's weight.
c)
the buoyant force equals the object's weight.
d)
there is high air pressure.
42.

Shear stress in static fluid is

a)

always zero

b)

always maximum

c)

between zero to maximum

d)

unpredictable

43.

Which property of the fluid offers resistance to deformation under the action of shear force?

a)

density

b)

viscosity

c)

permeability

d)

specific gravity

44.

Which of the following forces generally act on fluid while considering fluid dynamics?

1. Viscous force

2. Pressure force

3. Gravity force

4. Turbulent force

5. Compressibility force

a)

(1), (3), (4) and (5)

b)

(1), (2), (3) and (5)

c)

(1), (2), (3) and (4)

d)

(1), (2), (3), (4) and (5)

45.

Coefficient of friction for laminar flow is given as

Where,

Re = Reynold’s number

a. (Re / 32)

b. (32 / Re)

c. (Re / 16)

d. (16 / Re)

a)

Re/32

b)

32/Re

c)

Re/16

d)

16/Re

46.
Bernoulli's principle states that the pressure in a fluid ____________as the fluid's velocity _____________
a)
decreases, decreases
b)
increases, increases
c)
decreases, increases
d)
goes up, goes up
47.

In venturimeter, the velocity of the liquid at the throat is

a)

Higher than inlet

b)

Higher than outlet

c)

Lesser than inlet

d)

Minimum

48.

Venturimeter and orificemeter measure the ___________ of the fluid

a)

Average velocity

b)

Point velocity

c)

Pressure

d)

Maximum velocity

49.

The cylindrical portion of short length, which connects converging and diverging section of venturimeter, is called as

a)

diffuser

b)

connector

c)

throat

d)

manometer tube

50.

Which of the following devices does not use Bernoulli's equation as its working principle?

a)

Venturimeter

b)

Orifice-meter

c)

Pitot tube

d)

None of the above

51.

In a steady, ideal flow of an incompressible fluid, total energy at any point of the fluid is always constant. This theorem is known as

a)

Euler's theorem

b)

Bernoulli's theorem

c)

Continuity Euation

d)

Pascal law

52.

The pressure at the section of minimum cross sectional area is

a)

Constant

b)

minimum

c)

Maximum

d)

none of these

53.

Relative density of mercury is

a)

1

b)

13.6

c)

9.81

d)

10

54.

The relation between head of water and head of mercury in u tube manometer is

a)

h=12.6 hm

b)

h= 13.6 hm

c)

h=hm(SmSw−1)h=h_m\left(\frac{S_m}{S_w}-1\right)

d)

Both A and C

55.

Coefficient of discharge for venturimeter is

a)

0.96-0.98

b)

1.2-1.4

c)

0.5-0.6

d)

0.62

56.

The metacentric height is the distance between the

a)

centre of gravity of the floating body and the centre of buoyancy

b)

centre of gravity of the floating body and the metacentre

c)

metacentre and centre of buoyancy

d)

original centre of buoyancy and new centre of buoyancy

57.

Stable equilibrium of floating bodies is

a)

when its metacentric height is zero

b)

when the metacentre is above the centre of gravity

c)

when the metacentre is below the centre of gravity

d)

only when its centre of gravity is below its centre of buoyancy

58.

The stability of floating is govern by

a)

Centre of Buoyancy

b)

Centre of gravity

c)

Metacentre

d)

Any of the above

59.

Coefficient of discharge is

a)

actual discharge/ theoretical velocity

b)

actual discharge/ area

c)

actual discharge/ theoretical discharge

d)

Theoretical discharge /actual discharge

60.

Orifice meter is used to measure

a)

Discharge

b)

Velocity

c)

Pressure

d)

Area

61.
Which equation is obtained by integrating the Euler's equation?
a)
Continuity
b)
Bernoulli's
c)
Momentum
d)
all of these
62.
The sum of the pressure energy, the kinetic energy and the potential energy per unit mass is ____
a)
Continuity
b)
Bernoulli's
c)
Momentum
d)
all of these
63.
How is the length of compund pipe can be calculated?
a)
By adding length of different pipes of compound pipe
b)
By subtracting length of different pipes of compound pipe
c)
Using darcy's head loss equation
64.

One litre of water occupies a volume of

a)

100 cm3

b)

250 cm3

c)

500 cm3

d)

1000 cm3

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