Explore topic-wise MCQs in Testing Subject.

This section includes 657 Mcqs, each offering curated multiple-choice questions to sharpen your Testing Subject knowledge and support exam preparation. Choose a topic below to get started.

1.

Which rock is expected to have highest strength grade?

A. Sand stone rock
B. Limestone rock
C. Solid quartzite rock
D. Marble rocks
E. Granite rock
Answer» D. Marble rocks
Discussion
2.

In the theory of lubrication the assumption is made that

A. The pressure variation along the bearing is the same as if the plates were parallel
B. The velocity varies linearly between the two surfaces
C. The velocity distribution is the same at all cross-sections
D. The velocity varies linearly between the two surfaces
E. The velocity distribution at any section is the same as if the plates were parallel
Answer» F.
Discussion
3.

Darcy's equation for flow through porous media valid as long as the flow remains

A. steady
B. turbulent with negligible inertial effects.
C. critical
D. laminar with negligible internal effects
Answer» E.
Discussion
4.

The flow in a pipe is laminar if the Reynolds number is

A. Between 2000 and 4000
B. Equal to 10000
C. Between 4000 and 6000
D. Equal to 6300
E. Less than 2000
Answer» F.
Discussion
5.

The units of dynamic viscosity are

A. kg m2/sec
B. kg-sec/m
C. Newton/m2-sec
D. m2/sec
E. Newton-sec/m2
Answer» F.
Discussion
6.

The size of a venturimeter is specified by

A. pipe diameter
B. Discharge channel
C. fluid pressure
D. pipe diameter and throat diameter
Answer» F.
Discussion
7.

Fluid statics deals with

A. Viscous and pressure forces
B. Viscous and gravity forces
C. Gravity and pressure forces
D. Surface tension and gravity forces
E. None of the above
Answer» D. Surface tension and gravity forces
Discussion
8.

In above problem, what will be the horse power required to drive the pump?

A. 1000
B. 1670
C. 1570
D. 1450
E. 1900
Answer» C. 1570
Discussion
9.

An imaginary curve drawn through a flowing fluid in such a way that the tangent to it at any point gives the direction of the velocity of flow at that point, is known as

A. Flow-contour
B. Line of flow
C. Streak line
D. Path line
E. Flow line
Answer» D. Path line
Discussion
10.

A short tube mouthpiece will not run full at its outlet if the head under which the orifice work is

A. Less than 5 m of water
B. Between 5 and 10 m of water
C. Less than 3 m of water
D. More than 12.5 m of water
E. Less than 10 m of water
Answer» E. Less than 10 m of water
Discussion
11.

Specific speed of a impulse turbine ranges from

A. 100 - 140
B. 200 - 300
C. 300 - 800
D. 100 - 200
E. 0 - 4.5
Answer» F.
Discussion
12.

1 m of water column is equivalent to

A. 10 kN/m2
B. 1000 kN/m2
C. 0.1 kN/m2
D. 100 kN/m2
E. 1.0 kN/m2
Answer» B. 1000 kN/m2
Discussion
13.

Which of the following component of a reciprocating pump is not made of cast iron?

A. Cylinder
B. Air vessel
C. Foot valve
D. Shaft
E. All of the above
Answer» E. All of the above
Discussion
14.

The head loss in a pipe flow can be calculated using

A. the Momentum equation
B. The darcy Weisbach equation
C. the Bernoulli equation
D. Darcy's law
E. the Chezy Manning equation
Answer» C. the Bernoulli equation
Discussion
15.

The hydraulic gradient line

A. Is same as central line of section
B. Is always parallel to the bottom
C. Is always below the total energy line
D. Is always below the total energy line
E. Is always above the total energy line
Answer» E. Is always above the total energy line
Discussion
16.

Under which of the following conditions, Bernoulli's equation cannot be applied?

A. When the flow is rotational
B. When the flow is turbulent
C. When the flow is unsteady
D. All of the above
Answer» E.
Discussion
17.

A body with a rounded nose and along tapering tail is usually best suited for

A. supersonic flow
B. turbulent subsonic flow
C. sonic flow
D. Laminar flow
Answer» C. sonic flow
Discussion
18.

The effect of negative pressure beneath the nappe in case of flow of water over a rectangular suppressed weir is to

A. Decrease the discharge
B. Increase the discharge
C. Increase frictional resistance
D. Reduced frictional resistance
E. None of the above
Answer» F.
Discussion
19.

The portion of the power canal that extends from the intake works to the power house, is known as

A. Tail race
B. Main storage
C. Lead race
D. Diversion canal
E. Head race
Answer» F.
Discussion
20.

The oscillatory motion of a ship or a boat about its transverse axis is termed as

A. Rolling
B. Gyro-motion
C. Pitching
D. Transverse motion
E. Transverse harmonic motion
Answer» D. Transverse motion
Discussion
21.

Two units are homologous when they are geometrically similar and have

A. Similar stream lines
B. Same Froud's number
C. Same efficiency
D. Same Reynolds number
E. None of these answers
Answer» E. None of these answers
Discussion
22.

Critical speed of turbine is

A. Same as maximum operating speed
B. Same as run away speed
C. The speed equal to synchronous speed of generator
D. The speed at which shaft will break
E. The speed at which the number of natural vibrations or natural frequency equals the number of revolutions per minute
Answer» F.
Discussion
23.

The dam constructed on river chambal is

A. Jawaha Sagar
B. Rana Pratap Sagar
C. Gandhi Sagar
D. All of the above three
E. None of the above
Answer» E. None of the above
Discussion
24.

If the box in above problem is accelerated in a horizontal direction parallel to a pair of sides at the rate of 1 m/sec2, maximum pressure on the top of the box in metres of water would be

A. 0.3
B. 0.49
C. 0.6
D. 0.563
E. 0.225
Answer» B. 0.49
Discussion
25.

A closed cubical box 0.8 m on each side is half filled with water and the other half being filled with oil of specific gravity 0.75. Now if the box is accelerated upwards at the rate of 4.905 m/sec2 the pressure difference in kg/m2 between the top and bottom layers would be

A. 981
B. 545.5
C. 490.5
D. 1050
E. 1800
Answer» E. 1800
Discussion
26.

The dynamic viscosity of most of the gases with rise in gas temperature

A. Increses inversely as ?T
B. Decreases
C. Increases
D. Does not change significantly
E. Increases as ?T
Answer» D. Does not change significantly
Discussion
27.

In Buttress dam the column or slenderness ratio is usually maintained between

A. 2 to 5
B. 12 to 15
C. 20 to 25
D. 5 to 7
E. 7 to 10
Answer» C. 20 to 25
Discussion
28.

In a jet pump

A. kinetic energy of fluid is regained as potential energy
B. energy of high velocity stream is converted into pressure energy
C. energy of high pressure fluid is converted into low pressure fluid
D. potential energy of fluid is converted into rotational energy
Answer» D. potential energy of fluid is converted into rotational energy
Discussion
29.

Select a common dimensionless parameter in fluid mechanics from the following

A. Kinematic viscosity
B. Specific gravity
C. Specific weight
D. Angular velocity
E. None of the these answers
Answer» C. Specific weight
Discussion
30.

The state in which Hirakund dam is established is

A. Madhya Pardesh
B. Uttar Pradesh
C. Bihar
D. Orissa
E. West Bengal
Answer» E. West Bengal
Discussion
31.

The locus of elevations that water will rise in a series of pitot tube is called

A. the energy grade line
B. the velocity head
C. the hydraulic grade line
D. the head loss
E. the pressure head
Answer» B. the velocity head
Discussion
32.

A vessel containing water moves downward with a constant acceleratin equal to 'q' then

A. the pressure throughout the liquid mass will be atmospheric
B. the liquid mass will be under a pressure double the atmospheric pressure
C. the liquid mass will be in turbulence
D. the liquid mass will be under a pressure below the atmospheric pressure
Answer» B. the liquid mass will be under a pressure double the atmospheric pressure
Discussion
33.

When a venturimeter is used in an inclined position, it will show

A. Sale reading
B. More reading
C. Less reading
D. Depends on vescosity of fluid
E. None of the above
Answer» B. More reading
Discussion
34.

A pressure rise of 500 kPa is needed across a pump in a pipe transporting 0.2 m2/s of water. If the pump is 85% efficient, the power needed, in kW, would be

A. 118
B. 85
C. 65
D. 100
E. 60
Answer» B. 85
Discussion
35.

One poise is equivalent to

A. 9.8 dyne/sec
B. 98 kgf sec/m2
C. 1 gm/cm sec
D. 1 kg/m-hr
Answer» D. 1 kg/m-hr
Discussion
36.

The ratio of maximum load to the rated plant capacity is known as

A. Utilization factor
B. Plant factor
C. Load factor
D. Capacity factor
E. Maximum load factor
Answer» B. Plant factor
Discussion
37.

The disadvantage of burried penstocks is

A. Protection against freezing of conveyed water
B. Protection against earthquake shock
C. Difficulty in repair and maintenance
D. Immunity against rock sides, avalanches and falling tree
E. Protection against effect of temperature because of soil cover
Answer» D. Immunity against rock sides, avalanches and falling tree
Discussion
38.

The most efficient cross-section for a channel is

A. Half hexagon in the form of a trapezoid
B. Rectangular
C. Square
D. Triangular
E. Semi-circular
Answer» B. Rectangular
Discussion
39.

A piece of metal of specific gravity 3.4 floats in mercury of specific gravity 13.6. What fraction of its volume is under mercury

A. 0.75
B. Full
C. 0.25
D. 0.5
E. 0.9
Answer» C. 0.25
Discussion
40.

The gentre of gravity of the volume of liquid displaced by an immersed body is called

A. Centre of buoyancy
B. Wet C.G.
C. Metacentre
D. Wet centre
E. Centre of pressure
Answer» B. Wet C.G.
Discussion
41.

A piece of cork weighing 4 kg floats in water with 40% of its volume under the liquid. Determine specific gravity of cork.

A. 1
B. 0.16
C. 0.4
D. 0.6
E. None of the above
Answer» D. 0.6
Discussion
42.

Bluff body

A. Surface is smooth so that friction can be neglected
B. Surface does not coincide with stream lines
C. Surface perpendicular to stream lines
D. 8.3
E. Surface coincides with stream lines
Answer» C. Surface perpendicular to stream lines
Discussion
43.

By the usual gravity analysis as per B.I.S., the permissible tensile stresses at the upstream face of the dam under earthquake loading, should not exceed

A. Zero
B. 100 kg/ cm2
C. 50 kg/ cm2
D. 150 kg/ cm2
E. 200 kg/ cm2
Answer» B. 100 kg/ cm2
Discussion
44.

For hydrodynamically rough boundary the friction coefficient

A. Depends on velocity and relative roughness
B. Varies with Reynold's number
C. Depends on Reynolds number, pressure gradient and relative roughness
D. Remains constant
E. Depends on relative roughness
Answer» F.
Discussion
45.

The depth of water in a 3 m wide rectangular, finished concrete channel is 2m. If the slope is 0.001, estimate the flow rate, in m3/s

A. 14
B. 12
C. 11
D. 13
E. 10
Answer» B. 12
Discussion
46.

Select the quantity in the following that is not a dimensionless parameter

A. Kinematic viscosity
B. Darcy weisbach friction factor
C. Weber number
D. Froude number
E. Pressure coefficient
Answer» B. Darcy weisbach friction factor
Discussion
47.

In case the velocity vector at different points along a stream line remains unchanged then the flow is termed as

A. Irrotational flow
B. Uniform flow
C. Stoke's flow
D. Rotational flow
Answer» C. Stoke's flow
Discussion
48.

The velocity in a 2 cm-diameter pipe is 20 m/s. If the pipe enlarges to 5 cm diameter velocity, in m/s, will be

A. 6.4
B. 5.2
C. 3.2
D. 4.8
E. 8
Answer» D. 4.8
Discussion
49.

Froude number is useful in calculations for

A. Hydraulic jump
B. Surface tension force
C. Flow through pipes
D. Compressible flow problems
E. Water hammer
Answer» B. Surface tension force
Discussion
50.

A small plastic boat loaded with pieces of steel rods is floating in a bath tub. It the cargo is dumped into the water allowing the boat to float empty, the water level in the tub will

A. Fall
B. Fall and then rise
C. Rise and then fall
D. Not change
E. Rise
Answer» B. Fall and then rise
Discussion