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.

Fresh water 2 m deep flows over the top of 4 m of salt water (S = 1.04). The pressure at the bottom, in kPa, is

A. 60.4
B. 58.8
C. 55.2
D. 51.3
E. 47.9
Answer» B. 58.8
Discussion
2.

The lift on the cylinder caused by the circulation is independent of

A. velocity
B. cylinder diameter
C. magnitude of circulation
D. None of the above
Answer» C. magnitude of circulation
Discussion
3.

Essentially the gravity dam resists the loads to which it is exposed, due to its

A. Volume
B. Size
C. Mass
D. Gravity
E. High tensile stress
Answer» D. Gravity
Discussion
4.

The pressure inside a 4 cm dia hose is 700 kPa. If the water exits through 1 2 cm dia. Nozzle what velocity in m/s can be expected inside the hose?

A. 10.5
B. 9.7
C. 16.3
D. 20.4
E. 12.4
Answer» C. 16.3
Discussion
5.

A mercury water manometer indicates a gauge difference of 400 mm. The difference in pressure, measured in metres of water, is

A. 0.4
B. 0.8
C. 1088
D. 5.44
E. None of the above
Answer» E. None of the above
Discussion
6.

What pressure differential, in pascals, exists at the bottom of a 3 m vertical wall if the temperature inside is 20?C and outside it is -20?C. Assume equal pressures at the top

A. 3
B. 15
C. 6
D. 9
E. 12
Answer» D. 9
Discussion
7.

Drag force in not a function of

A. mass density of the fluid
B. mass density of the body
C. velocity of the body
D. projected area of the body
Answer» C. velocity of the body
Discussion
8.

In Buttress dam, too flat a slope causes

A. A very high inclined stress at the heel
B. Overloading of buttress sections
C. Excessive tensile stress on upstream face
D. Increased tendency to overturning
E. Excessive tensile stresses in the foundation and the body of the dam
Answer» B. Overloading of buttress sections
Discussion
9.

Eulers dimensionless number relates the following

A. None
B. Pressure force and viscous force
C. Inertial force and gravity
D. Viscous force and inertial
E. Pressure force and inertial force
Answer» F.
Discussion
10.

If a centrifugal pump is noisy in operation, the cause may be

A. Air in water
B. Discharge head too high
C. Mechanical defect
D. Suction head too high
E. Priming faulty
Answer» D. Suction head too high
Discussion
11.

A streamline

A. is the line of equal velocity in a flow
B. occurs on all types of flows
C. is fixed in space in space flow
D. 51.3
E. is the line along geometrical centre of the flow
Answer» D. 51.3
Discussion
12.

Tranqil flow must always occur

A. Below normal depth
B. Above normal depth
C. Above critical depth
D. Below critical depth
E. At normal depth
Answer» D. Below critical depth
Discussion
13.

Boundary layer thickness (?) is the distance from the surface of the solid body in the direction perpendicular to flow, where the velocity of fluid is equal to

A. Free stream velocity
B. 0.9 times the free stream velocity
C. 0.99 times the free stream velocity
D. None of the above
E. Free vortex motion
Answer» D. None of the above
Discussion
14.

The centre of buoyancy is

A. Centroid of displaced volume of fluid
B. Mid-point between C.G. and metacentre
C. The point of intersection of the buoyant force and the centre line of the body
D. Centre of gravity of the body
E. When the metacentre is below C.G.
Answer» B. Mid-point between C.G. and metacentre
Discussion
15.

The flow between any two stream lines

A. decreases along its path
B. remains the same
C. increases along its path
D. is always zero
Answer» D. is always zero
Discussion
16.

Mercury is generally used in barometer because

A. It does not stick to the tube walls
B. It has practically zero vapour pressure
C. All above
D. It shines and can be easily read
E. Of higher density due to which the height of barmeter will be small
Answer» F.
Discussion
17.

An orifice is said to be a large orifice when

A. Electrical conductivity
B. An orifice can discharge fluid within 10 minutes
C. The cross-section of orifie is not less than 10% of the cross-section of tank
D. The head over the orifice is smaller than its vertical dimensions
Answer» E.
Discussion
18.

World's largest capacity hydro-electric generating plant is located in

A. U.S.S.R.
B. U.S.A.
C. France
D. India
E. Germany
Answer» B. U.S.A.
Discussion
19.

The magnitude of earthquake pressure on a dam varies as a function of

A. Frequency of vibration and amplitude
B. Richard's scale number
C. Amplitude
D. Frequency of vibration
E. Amplitude and intensity
Answer» B. Richard's scale number
Discussion
20.

In a turbine installation gross head is defined as

A. The difference of level between the head race and the tail race
B. The difference of level between reservoir and downstream
C. The difference of head between axis of turbine to discharge stream level
D. The head actually used in developing power
E. None of the above
Answer» B. The difference of level between reservoir and downstream
Discussion
21.

Specific speed for reaction turbine ranges from

A. 10 - 110
B. 3 - 710
C. 200 - 300
D. More than 300
E. 125 - 180
Answer» B. 3 - 710
Discussion
22.

When the Reynolds number is less than 500 the flow is said to be laminar for

A. pipe flow
B. flow between parallel plates
C. free surface flow
D. all of the above
Answer» E.
Discussion
23.

An object having 20 kg mass weighs 19.60 kg on a spring type balance. The value of 'g' in m/sec2 for the place is

A. 1000
B. 10.1
C. 9.8
D. 10.2
E. 9.9
Answer» F.
Discussion
24.

The maximum continuous power available from a hydro-electric plant under the most adverse hydraulic conditions is known as

A. Primary power
B. Firm power
C. Installed capacity
D. Base power
E. Secondary power
Answer» C. Installed capacity
Discussion
25.

In a flow field, at the stagnation point

A. total energy is zero
B. pressure head is equal to velocity head
C. All the velocity head is converted into pressure head
D. pressure is zero
Answer» D. pressure is zero
Discussion
26.

The loss of head due to sudden enlargement is attributed to

A. roughness of the pipe
B. production and dissipation of turbulent energy
C. viscosity of fluid
D. generation of heat
Answer» D. generation of heat
Discussion
27.

The flow in venturi flume takes place at

A. Atmospheric pressure
B. Vacuum
C. High pressure
D. Varying pressure
E. None of the above
Answer» B. Vacuum
Discussion
28.

If a water tank partially filled with water is being carried on a truck with a constant horizontal acceleration, the level of liquid will

A. Rise on the front side of the tank
B. Rise on the back side of the tank and fall on front
C. Fall on the front side of the tank
D. Front side fluctuate considerably
E. Fall on the back side of the tank and rise on front
Answer» C. Fall on the front side of the tank
Discussion
29.

The thickness of laminar boundary layer at a distance x from the leading edge over a flat plate varies as

A. x1/2
B. x3/5
C. x2
D. x
E. x4/5
Answer» B. x3/5
Discussion
30.

Kinematic similarity between model and prototype means

A. Vitrified clay.
B. The similarity of shape
C. The similarity of discharge
D. The similarity of forces
E. The similarity of motion
Answer» E. The similarity of motion
Discussion
31.

When the relationship between Reynolds number and the friction factor is represented by a straight line the flow is said to be

A. laminar flow
B. vortex flow
C. turbulent flow
D. isentropic flow
Answer» B. vortex flow
Discussion
32.

In reaction turbine the draft tube is used

A. To increase the effective head
B. To prevent air from entering
C. To reconvert kinetic energy to flow energy by a gradual expansion of the flow cross-section
D. To transport water to downstream without eddies
E. To run the turbine full
Answer» D. To transport water to downstream without eddies
Discussion
33.

Chemically inact relatively unstable blocks, large or small with three or more sets of joints and seams are known as

A. Moderately jointed rocks
B. Crushed rocks
C. Schistos rocks
D. Chemical rocks
E. Block or seamy rocks
Answer» F.
Discussion
34.

A critical depthmeter is used to measure

A. Discharge in an open channel
B. Depth of oceans and rivers
C. Rise in head during hydraulic jump
D. Effective head of fluid flowing in a pipe
E. Rise in head during water hammer
Answer» B. Depth of oceans and rivers
Discussion
35.

The general energy equation is applicable to

A. Turbulent flow
B. Unsteady flow
C. Laminar flow
D. Steady flow
E. Non-uniform flow
Answer» E. Non-uniform flow
Discussion
36.

As the temperature increases, the viscosity of a gas

A. increases, increases
B. decreases, decreases
C. increases, decreases
D. decreases, increases
Answer» E.
Discussion
37.

The pressure centre is

A. A point on the line of action of the resultant force
B. At the centroid of the submerged area
C. Independent of the orientation of the area
D. Always above the centroid of area
E. The centroid of the pressure prism
Answer» B. At the centroid of the submerged area
Discussion
38.

Mouthpieces are used to measure

A. pressure
B. rate of flow
C. frictionless
D. viscosity
E. velocity
Answer» C. frictionless
Discussion
39.

The force acting on a gravity dam which causes stability is

A. Reservoir water pressure
B. Uplift
C. Weight of the dam
D. Wind pressure
E. Earth and silt pressure
Answer» D. Wind pressure
Discussion
40.

In order to keep out debris and other materials carried by water which are likely to damage turbine, provision is made by

A. Ensign valve
B. Jet flow gates
C. Trash racks
D. Radial gates
E. Trunions
Answer» D. Radial gates
Discussion
41.

Anchor blocks are provided to hold the pipe line so as to

A. Prevent the pipe line sliding down the hill
B. Control the direction of expansion
C. Resist the unbalanced hydrostatic forces at a change of direction of the pipe line
D. Prevent movement of the pipe line on account of vibration or water hammer pressures
E. All of the above
Answer» F.
Discussion
42.

In Red wood viscometer

A. Absolute value of viscosity is determined
B. The fluid discharges through orifice with negligible velocity
C. Comparison of viscosity is done
D. Part of the head of fluid is utilised in overcoming friction
E. The fluid should rapidly flow out of the orifice
Answer» D. Part of the head of fluid is utilised in overcoming friction
Discussion
43.

Air vessels in a reciprocating pump is

A. Fitted in the suction line
B. Fitted in the delivery line
C. A cast iron chamber having an opening at the base
D. A, B and C above together
E. None of the above
Answer» E. None of the above
Discussion
44.

A Founeyron turbine is

A. Outward flow reaction turbine
B. Inward flow reaction turbine
C. Outward flow impulse turbine
D. Inward flow impulse turbine
E. None of the above
Answer» B. Inward flow reaction turbine
Discussion
45.

In a venturimeter

A. Length of divergent cone is equal to the length of conergent cone
B. Length of divergent cone is half that of convergent cone
C. Divergent cone is kept shorter than convergent cone
D. Divergent cone is kept longer than the convergent cone
E. None of the above
Answer» C. Divergent cone is kept shorter than convergent cone
Discussion
46.

A froude number of 2 indicates

A. a weak jump
B. a medium jump
C. a very strong jump
D. a strong jump
Answer» B. a medium jump
Discussion
47.

A hydraulic jump can occur under all of the following conditions EXCEPT

A. at the foot of the spillways
B. where the gradient suddenly chauges from a steep slope to a flat slope
C. when water moving in shooting flow impacts with water having a larger depth with streaming flow
D. on the upstream side of the sluices
Answer» F.
Discussion
48.

Which is the correct statement

A. In volute casing the velocity of water decreases but pressure increases
B. In volute casing the velocity of water and also pressure increase
C. Volute casing is improvement over the vortex casing
D. Volute casing provides diffusering
E. None of the above
Answer» B. In volute casing the velocity of water and also pressure increase
Discussion
49.

The foot valve is provided

A. On suction line
B. On delivery line
C. Both suction and delivery line
D. Neither suction nor delivery lines
E. All of the above
Answer» B. On delivery line
Discussion
50.

The motion of air mass in a tornado is

A. free vortex at the centre and forced vortex outside
B. free vortex at the centre as well as outside
C. forced vertex at the centre and free vortex outside
D. forced cortex at the centre as well as outside
Answer» E.
Discussion