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.

In above problem what will be the ratio of discharge?

A. 27.7
B. 83.5
C. 100
D. 277
E. 2.77
Answer» B. 83.5
Discussion
2.

A piezometer is not used for pressure measurement in pipes when

A. Velocity of fluid is low
B. The pressure drop in the pipe is low
C. The pressure is very low
D. Velocity of fluid is high
E. The fluid in the pipe is a gas
Answer» F.
Discussion
3.

The boundary condition for steady flow of an ideal fluid is that the

A. Continuity equation must be satisfied
B. Boundary surface must be stationary
C. Velocity component tangent to the boundary is zero
D. Velocity is zero at the boundary
E. Velocity component normal to the boundary is zero
Answer» F.
Discussion
4.

In order to avoid a correction for the effect of capillarity in manometers, the diameter of the tube should be

A. Less than 1 mm
B. Less than 3 mm
C. Less than 4.5 mm
D. Greater than or equal to 6 mm
E. None of the above
Answer» E. None of the above
Discussion
5.

Identify the statement which is not one of the assumptions made for the derivation of Bernoulli's theorem

A. All the above
B. The flow is two dimensional
C. Fluid is incompressible
D. Fluid is ideal
E. The flow is steady and continuous
Answer» C. Fluid is incompressible
Discussion
6.

1 atm pressure is equivalent to

A. 1.01315 x 105 N/m2
B. 700 mm Hg
C. 1.0133 x 105 kg/m-sec2
D. 1.0133 x 106 kg/cm-sec2
E. Any of the above
Answer» F.
Discussion
7.

A hydrograph is is a plot of

A. Discharge against time
B. Cumulative run off against time
C. Rainfall intensity against time
D. Cumulative rainfall against time
Answer» B. Cumulative run off against time
Discussion
8.

Select the statement which is correct

A. Local atmospheric pressure is always below standard atmospheric pressure
B. Standard atmospheric pressure is 1 kg/cm2
C. Standard atmospheric pressure is the mean local atmospheric pressure at sea level
D. Local atmospheric pressure depends upon the elevation of the locality only
E. A barometer reads the difference between load and standard atmospheric pressure
Answer» D. Local atmospheric pressure depends upon the elevation of the locality only
Discussion
9.

1 lb/in2 pressure is equivalent to

A. 144 lb/ft2
B. 6.8046 x 10-2
C. 6.8947 x 103 kg/m-sec2
D. 0.06895 bar
E. Any of the above
Answer» F.
Discussion
10.

The pressure in metres of oil (specific gravity 0.85) equivalent to 42.5 m of water is

A. 100 m
B. 52.5 m
C. 85 m
D. 42.5 m
E. 50 m
Answer» F.
Discussion
11.

In a flow field, stagnation point is a point where the

A. both pressure and velocity are zero
B. pressure is zero
C. velocity is zero
D. gravitational effect is zero
Answer» E.
Discussion
12.

When a fluid flows through a tapering pipe at a constantly increasing rate, the flow is said to

A. Irrotational flow
B. Unsteady uniform flow
C. Unsteady flow
D. Turbulent flow
E. Unsteady non-uniform flow
Answer» F.
Discussion
13.

In a centrifugal pump the pressure energy of water is increased because of

A. Rotation of impeller
B. Centrifugal force
C. Momentum of particles
D. Lift of particles
E. None of the above
Answer» C. Momentum of particles
Discussion
14.

A hydro-electric plant is usually temed as high head plant when the head is

A. more than 5 m
B. more than 45 m
C. more than 35 m
D. more than 25 m
E. more than 15 m
Answer» C. more than 35 m
Discussion
15.

In case of forced vortex

A. The fluid rotates with radial as well vertical velocities.
B. Velocity increases with radius
C. The motion of fluid varies at random
D. Velocity decreases with radius
E. The fluid rotates as a composite solid
Answer» C. The motion of fluid varies at random
Discussion
16.

2𝑔148. The power transmitted through the pipe is maximum when head lost due to friction in the pipe is equal to

A. (1/3) rd of the total supply head
B. (1/4) th of the total supply head
C. (1/5) th of the total supply head
D. (1/8) th of the total supply head
Answer» D. (1/8) th of the total supply head
Discussion
17.

In MLT system the dimensions of angular momentum would be

A. ML2T-2
B. MLT-2
C. MLT-1
D. ML2T-1
E. ML2T
Answer» E. ML2T
Discussion
18.

The simplest type of controls for reservoir outlets is provided by

A. Radial gates
B. Slide gates
C. Jet flow gates
D. Cylindrical gates
E. Height pressure gates
Answer» C. Jet flow gates
Discussion
19.

Loss of head due to sudden enlargement is given as

A. (𝑉1−𝑉2)32𝑔
B. (𝑉1−𝑉2)22𝑔
C. (𝑉12−𝑉22)2𝑔
D. √(𝑉1−𝑉2)2𝑔
Answer» C. (𝑉12−𝑉22)2𝑔
Discussion
20.

For hypersonic flow, the Mach no, is

A. Creater than two
B. Greater than unity
C. Greater than four
D. Greater than ten
E. Unity
Answer» D. Greater than ten
Discussion
21.

In an isothermal atmosphere

A. Pressure varies in the same way as density
B. Pressure is constant all over
C. Pressure decreases linearly with elevation
D. Pressure varies exponentially with density
E. Pressure increases directly as the square of height
Answer» B. Pressure is constant all over
Discussion
22.

A tank 2 m square contains one metre of water. Now the tank is accelerated in the horizontal direction parallel to a pair of sides at the rate of 4 m/sec2. In order that there may be no spilling of water the minimum height of the tank should be

A. 4 m
B. 2.32 m
C. 1.41 m
D. 2 m
E. 1 m
Answer» D. 2 m
Discussion
23.

In a turbulent flow in a pipe we know the

A. Viscous stresses dominate
B. Reynolds number is greater than 10,000
C. Shear stress varies linearly with radius
D. Head loss varies linearly with the flow rate
E. Fluid particles move in straight lines
Answer» D. Head loss varies linearly with the flow rate
Discussion
24.

Falling drops of water become spherical due to

A. Dynamic viscosity
B. Cohesion
C. Adhesion
D. Surface tension
E. Kinematic viscosity
Answer» E. Kinematic viscosity
Discussion
25.

The Reynolds number for flow of 0.3 m3/s of oil sp. Gr. 0.86,

A. 29.2
B. 292
C. 2920
D. 22930
E. None of the above
Answer» E. None of the above
Discussion
26.

Rocks with excessive internal stresses which may cause spalling are known as

A. Popping rocks
B. Stratified rocks
C. Swelling rocks
D. Crushed rocks
E. Schistos rocks
Answer» C. Swelling rocks
Discussion
27.

If the specific speed of a turbine is 6 then the turbine should be

A. Thomson
B. Kaplan
C. Pelton wheel
D. Francis
E. Fourneyron
Answer» D. Francis
Discussion
28.

The Reynolds number for pipe flow is given by

A. VD/v
B. VD
C. VD ? /
D. VD /
E. None of the above
Answer» D. VD /
Discussion
29.

Type of impeller used in mud pumps is

A. Shrouded
B. One side shrouded
C. Open
D. Double suction
E. Any of the above
Answer» D. Double suction
Discussion
30.

Reynold's no. may be defined as the ratio of

A. Viscous forces to gravity forces
B. Viscous forces to inertial forces
C. Gravity forces to thertial forces
D. None
E. Elastic forces to pressure forces
Answer» E. Elastic forces to pressure forces
Discussion
31.

The critical depth on a channel is given by

A. h = v2/g
B. h = v2/2g
C. h = v/g
D. h = 2v/g
E. h = v/2g
Answer» B. h = v2/2g
Discussion
32.

A mouthpiece cannot be used under very large head because

A. The variation in discharge is large
B. Cavitation occurs at the vena contracta
C. Of practical difficulties in contraction
D. Vortex is created at the vena contracta
E. The flow through mouthpiece is erratic
Answer» F.
Discussion
33.

Euler's equation of motion can be integrated when it is assumed that

A. The flow is rotational
B. Continrity equation is satisfied
C. Velocity potential exists and the density is constant
D. The fluid is incompressible
E. Bernoulli's satisfied
Answer» D. The fluid is incompressible
Discussion
34.

A Kaplan turbine is suitable for

A. High head low discharge
B. High head high discharge
C. Low head low discharge
D. Low head high discharge
E. None of the above
Answer» E. None of the above
Discussion
35.

In order that the water shall never rise more than 100 cm above the crest for a discharge of 5 cube metres per second, the length of weir will be

A. 2.5 metres
B. 2.51 metres
C. 2.00 metres
D. 1 metre
E. 2.49 metres
Answer» F.
Discussion
36.

The viscosity of a fluid with specific gravity 1.3 is measured to be 0.0034 Ns/m2. Its kinematic viscosity, in m2/s, is

A. 5.8 x 10-6
B. 2.6 x 10-6
C. 9.6 x 10-6
D. 4.4 x 10-6
E. 7.2 x 10-6
Answer» C. 9.6 x 10-6
Discussion
37.

The pressure gradient in laminar motion along the flow dirction is equal to

A. velocity gradient
B. the rate of change of shear stress normal to the direction of flow
C. the rate of change of velocity normal to the direction of flow
D. the rate of change of shear stress along the direction of flow
Answer» D. the rate of change of shear stress along the direction of flow
Discussion
38.

The pressure gradient (?p/?x) in a developed turbulent flow in a horizontal pipe

A. varies directly with the average velocity
B. is constant
C. decreases exponentially
D. is zero
E. varies linearly with axial distance
Answer» C. decreases exponentially
Discussion
39.

When the rheogram for a fluid at any temperature and pressure is a straight line passing through origin, the fluid is said to be

A. Newtonian
B. Non-Newtonian
C. Bingham
D. Ideal plastic
Answer» C. Bingham
Discussion
40.

The centre of buoyancy always coincides with

A. centre of gravity of the body
B. centroid of the volume displaced
C. metacentre
D. None of the above
Answer» C. metacentre
Discussion
41.

Water at 20? C will rise, in a clean 1 mm dia. Glass tube, a distance, in cm, of

A. 3
B. 5
C. 1
D. 4
E. 2
Answer» B. 5
Discussion
42.

Capallary waves in channels, capillary rise in narrow passages are the instances where

A. surface tension is negligible
B. elastic forces are prefominant
C. surface tension cannot be neglected
D. viscous forces play a dominant role
Answer» E.
Discussion
43.

Model analysis of free surface flows are based on

A. Reynold's no
B. Greater than ten
C. Mach no.
D. Froude no.
E. Euler no.
Answer» E. Euler no.
Discussion
44.

The purpose of surge tank in a pipe line is to

A. To maintain the flow of water under emergency conditions
B. To relieve the pressure due to water hammer
C. Smoothen the flow of water
D. Prevent occurrence of hydraulic jump
E. Minimise friction losses in pipe
Answer» C. Smoothen the flow of water
Discussion
45.

The minimum diameter necessary to avoid the capillary rise in the manometer is

A. 6 mm
B. 1 mm
C. 3 mm
D. 15 mm
Answer» B. 1 mm
Discussion
46.

A stationary body immersed in a river has a maximum pressure of 69 Kpa exerted on it at a distance of 5.4 m below the free surface. What velocity of river could be expected ?

A. 9 m/sec
B. 5.4 m/sec
C. 3.82 m/sec
D. 5.67 m/s
E. None of the above
Answer» E. None of the above
Discussion
47.

Formation of air pockets in pressure tunnel may be avoided by

A. Avoiding partial gate opening
B. Avoiding traps or pockets along the crown
C. Avoiding vortices formation
D. Avoiding small intakes
E. Any of the above
Answer» F.
Discussion
48.

The ratio between inertial forces and the square root of pressure forces is known as

A. Euler number
B. Weber number
C. Mach number
D. Froude number
Answer» B. Weber number
Discussion
49.

One dimensional flow is

A. Restricted to flow in a straight line
B. Flow which neglects changes in a transverse direction
C. Steady uniform flow
D. Uniform flow
E. None of the above
Answer» C. Steady uniform flow
Discussion
50.

The force, in kN acting on one of the 1.5 m sides of an open cubical water tank (which is full) is

A. 12.1
B. 10.2
C. 18.2
D. 15.3
E. 16.5
Answer» F.
Discussion