Practice Hydraulics And Fluid Mechanics Multiple Choice Questions Quiz-4 - MCQGeeks.com

Q.1

Steady flow occurs when

the direction and magnitude of the velocity at all points are identical
the velocity of successive fluid par-ticles, at any point, is the same at suc-cessive periods of time
the magnitude and direction of the velocity do not change from point to point in the fluid
the fluid particles move in plane or parallel planes and the streamline pat-terns are identical in each plane

Q.2

The difference of pressure between the inside and outside of a liquid drop is

(a)p = Txr
(b)p = T/r
p = T/2r
(d)p = 2T/r

Q.3

Fluid is a substance that

cannot be subjected to shear forces
always expands until it fills any container
has the same shear stress.at a point regardless of its motion
cannot remain at rest under action of any shear force

Q.4

The discharge of a liquid of kinematic viscosity 4 cm²/sec through a 8 cm dia-meter pipe is 3200n cm7sec. The type of flow expected is

laminar flow
transition flow
turbulent flow
not predictable from the given data

Q.5

Hydrometer is used to determine

specific gravity of liquids
specific gravity of solids
specific gravity of gases
relative humidity

Q.6

The units of dynamic or absolute viscosity are

metres² per sec
kg sec/meter
newton-sec per meter
newton-sec² per meter

Q.7

Newton’s law of viscosity relates

intensity of pressure and rate of angular deformation
shear stress and rate of angular deformation
shear stress, viscosity and temperature
viscosity and rate of angular deformation

Q.8

For hydro-dynamically smooth boundary, the friction coefficient for turbulent flow is

constant
dependent only on Reynolds number
a function of Reynolds number and relative roughness
dependent on relative roughness only

Q.9

Two pipe systems can be said to be equivalent, when the following quantites are same

flow and length
friction loss and flow
length and diameter
friction factor and diameter

Q.10

Cavitation is caused by

high velocity
high pressure
weak material
low pressure

Q.11

For laminar flow in circular pipes, the Darcy’s friction factor f is equal to

16/Re
32/ Re
64/ Re
none of the above where Re is Reynolds number.

Q.12

The shear stress distribution for a fluid flowing in between the parallel plates, both at rest, is

constant over the cross section
parabolic distribution across the section
zero at the mid plane and varies linearly with distance from mid plane
zero at plates and increases linearly to midpoint

Q.13

The line of action of the buoyant force acts through the

centroid of the volume of fluid vertically above the body
center of the volume of floating body
center of gravity of any submerged body
centriod of the displaced volume of fluid

Q.14

A pressure of 25 m of head of water is equal to

25 kN/m2
245 kN/m2
2500 kN/m2
2.5 kN/m2

Q.15

The pressure at a point in a fluid will not be same in all the directions when the fluid is

moving
viscous
inviscous and moving
viscous and moving.

Q.16

For similarity, in addition to models being geometrically similar to prototype, the following in both cases should also be equal

ratio of inertial force to force due to viscosity
ratio of inertial force to force due to gravitation
ratio of inertial force to force due to surface tension
all the four ratios of inertial force to force due to viscosity, gravitation, surface tension, and elasticity

Q.17

A hydraulic press has a ram of 15 cm diameter and plunger of 1.5 cm. It is required to lift a weight of 1 tonne. The force required on plunger is equal tc

10 kg
100 kg
1000 kg
1 kg

Q.18

Property of a fluid by which its own molecules are attracted is called

adhesion
cohesion
viscosity
compressibility

Q.19

The property of a fluid which enables it to resist tensile stress is known as

compressibility
surface tension
cohesion
adhesion

Q.20

Center of buoyancy is the

centroid of the displaced volume of fluid
center of pressure of displaced volume
e.g. of floating body
does not exist

Q.21

Equation of continuity is based on the principle of conservation of

mass
energy
momentum
none of the above

Q.22

Working principle of dead weight pressure gauge tester is based on

Pascal’s law
Dalton’s law of partial pressure
Newton’s law of viscosity
Avogadro’s hypothesis

Q.23

The stress-strain relation of the newtoneon fluid is

linear
parabolic
hyperbolic
inverse type

Q.24

Specific weight of water in S.I. units is equal to

1000 N/m3
10000 N/m3
9.81 xlO3 N/m3
9.81 xlO6 N/m3

Q.25

The eddy viscosity for turbulent flow is

a function of temperature only
a physical property of the fluid.
dependent on the flow
independent of the flow

Q.26

The resultant upward pressure of the fluid on an immersed body is called

upthrust
buoyancy
center of pressure
all the above are correct

Q.27

Which of the following meters is not associated with viscosity

Red wood
Say bolt
Engler
Orsat

Q.28

An odd shaped body weighing 7.5 kg and occupying 0.01 m3 volume will be completely submerged in a fluid having specific gravity of

1
1.2
0.8
0.75

Q.29

Bernoulli equation deals with the law of conservation of

mass
momentum
energy
work

Q.30

Metacentre is the point of intersection of

vertical upward force through e.g. of body and center line of body
buoyant force and the center line of body
mid point between e.g. and center of buoyancy
all of the above

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