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.

Meter associated with viscosity

A. Saybolt
B. Orsat
C. 10
D. Redwood
E. Engler
Answer» B. Orsat
Discussion
2.

In a free vortex flow, the tangential velocity is

A. directly proportional to the square of the radial distance
B. inversely proportional to the square of the radial distance
C. directly proportional to the radial distance
D. inversely proportional to the radial distance
Answer» F.
Discussion
3.

The terminal velocity of a small sphere setting in a viscous fluid varies as the

A. Inverse of the diameter
B. Inverse square of the diameter
C. Fluid viscosity
D. Inverse of the fluid viscosity
E. None of the above
Answer» E. None of the above
Discussion
4.

Dynamic viscosity : Poise : kinematic viscosity

A. A.P.I.
B. Stoke
C. Slug
D. 1.25
E. N/m2
Answer» C. Slug
Discussion
5.

Which of the following statement regarding the buoyant force is incorrect?

A. Buoyant force has no horizontal component
B. The magnitude of the buoyant force is equal to the weight of fluid displaced by the body
C. The buoyant force acts through the centre of gravity of the body
D. None of the above
Answer» D. None of the above
Discussion
6.

In laminar flow through a pipe, discharge varies

A. Linearly as the viscosity
B. Linearly as pipe diameter
C. Inversely s the viscosity
D. Linearly as the pressure drop
E. None of the above
Answer» D. Linearly as the pressure drop
Discussion
7.

A container carrying water is moved in a horizontal direction with an acceleration of 2.45 m/s2. The angle of inclination of the free water surface to the horizontal is

A. 1.25
B. 14.03?
C. 0?
D. 45?
E. 67.8?
Answer» C. 0?
Discussion
8.

A pressure of 500 kPa applied to 2 m3 if liquid results in a volume change of 0.004 m3. The bulk modulus, in Mpa, is

A. 2500
B. 2.5
C. 2.5 x 106
D. 25
E. 250
Answer» F.
Discussion
9.

The viscosity of a fluid varies with

A. temperature
B. pressure
C. temperature, pressure and density
D. temperature and pressure
E. density
Answer» B. pressure
Discussion
10.

Hydraulic jump occurs when

A. Flow is sub-critical
B. Adequate downstream depth is available
C. Flow is supercritical and adequate downstream depth is available
D. Flow is sub-critical and adequate down streamdepth is available
E. Flow is supercritical
Answer» D. Flow is sub-critical and adequate down streamdepth is available
Discussion
11.

Presence of air in a pressure tunnel may result in

A. Increased discharge
B. Increased head loss
C. Water hammer
D. Bulking of flow
E. Any or all of the above
Answer» F.
Discussion
12.

Hydraulic jump is a

A. Steady non-uniform flow
B. Non-steady uniform flow
C. non-steady non-uniform flow
D. Steady uniform flow
Answer» C. non-steady non-uniform flow
Discussion
13.

Red wood viscometer

A. Compares viscosities of fluids
B. Measures absolute viscosity
C. Measures dynamic viscosity
D. Measures kinematic viscosity
E. None of the above
Answer» D. Measures kinematic viscosity
Discussion
14.

It is proposed to model a submarine moving at 10 m/s by taking a 10 : 1 scale model. What velocity, in m/s, would be needed in the model study?

A. 10
B. 40
C. 3.16
D. 100
E. 80
Answer» D. 100
Discussion
15.

A U-tube manometer, attached to an air pipe, measures 20 cm of mercury. The pressure, in kPa, in the air pipe is

A. 42.5
B. 32.4
C. 26.7
D. 51.3
E. 38.6
Answer» D. 51.3
Discussion
16.

The line traced by a single fluid particle as it moves over a period of time is known as

A. Line of force
B. Flow line
C. Filament line
D. Streak line
E. Path line
Answer» F.
Discussion
17.

The generating capacity of world's largest capacity hydroelectric plant is of the order of

A. 3000 MW
B. 5000 MW
C. 2000 MW
D. 1000 MW
E. 4000 MW
Answer» C. 2000 MW
Discussion
18.

A critical depthmeter is always

A. Associated with water hammer
B. Associated with steep gradient
C. Associated with hydraulic jump
D. Associated with surge
E. Associated with tranquil flow
Answer» D. Associated with surge
Discussion
19.

A flow is said to be laminar when

A. The fluid particles moves in a zig-zag way
B. The Reynold number is high
C. The fluid particles move in layers parallel to the boundary
D. None of the above
E. None of the above
Answer» D. None of the above
Discussion
20.

In Hagen-poiseuille flow of viscous liquid, one of the following pairs of forces strike a balance

A. Pressure and viscous forces
B. Inertia and gravity forces
C. 3
D. Gravity and viscous forces
E. Inertia and viscous forces
Answer» F.
Discussion
21.

The glass is considered as a

A. frozen liquid
B. liquid metal
C. crystal
D. solid
Answer» B. liquid metal
Discussion
22.

A hydraulic intensifier is a device

A. To lift small quantities of water through large head by means of large quantity of water falling through small height
B. To generate high pressure
C. To increase the intensity of pressure of water by means of the energy of a large quantity of water at low pressure
D. To temporarily store the energy of water
E. None of the above
Answer» D. To temporarily store the energy of water
Discussion
23.

A normal shockwave is analogous to

A. open channel flow with Fr < 1.0
B. hydraulic jump
C. a small amplitude wave in open channels
D. open channel flow with Fr > 1.0
Answer» C. a small amplitude wave in open channels
Discussion
24.

In an isothermal atmosphere the pressure

A. decreases linearly with elevation
B. cannot be related to elevation
C. is constant with elevation
D. decreases near the surface but approaches a constant value
E. decreases exponentially with elevation
Answer» F.
Discussion
25.

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

A. x1/2
B. x5/3
C. x5/4
D. x4/5
E. x3/5
Answer» E. x3/5
Discussion
26.

Which assumption is not valid in the analysis of gravity dams

A. The foundation and the dam behave as one unit, the joint being a perfect one
B. The stress in the foundation and the body of the dam are within plastic limits
C. The material in the foundation and in the body of the dam is isotropic and homogeneous
D. No loads are transferred to abutments by beam action
E. No movements are caused in the foundations due to transference of the load
Answer» C. The material in the foundation and in the body of the dam is isotropic and homogeneous
Discussion
27.

The river flow during floods can be classified as

A. Unsteady uniform flow
B. unsteady non-uniform flow
C. Steady uniform flow
D. steady non-uniform flow
Answer» D. steady non-uniform flow
Discussion
28.

The angle of contact (0) between mercury and glass tube in case of capillary depression is

A. 128?
B. 157?
C. 10?
D. 90?
E. 0?
Answer» B. 157?
Discussion
29.

Best section for open channel flow is

A. rectangular
B. trapezoidal
C. triangular
D. semi-circle
Answer» E.
Discussion
30.

In an open channel, under critical depth

A. specific energy is least varying
B. specific energy is maximum
C. specific energy is minimum
D. specific energy is zero
Answer» E.
Discussion
31.

A plot between power generated in MW and time is known as

A. Load curve
B. Load duration curve
C. Load factor
D. Demand curve
E. None of the above
Answer» B. Load duration curve
Discussion
32.

The condition for the stable equilibrium of a floating body is

A. The metercentre should lie above he e.g
B. The centre of buoyancy and the c.g must lie on the same vertical line
C. All of the above
D. None of the above
E. None
Answer» D. None of the above
Discussion
33.

Separation is caused by

A. Reduction of pressure gradient to zero
B. The boundary layer thickness reducing to zero
C. An adverse pressure gradient
D. Reduction of pressure to vapour pressure
E. None of these answers
Answer» D. Reduction of pressure to vapour pressure
Discussion
34.

Mercury is suitable for manometers because

A. It moves easily
B. It does not stick to tube walls
C. It has high density
D. It can be easily seen in tube
E. It is generally not used in manometers
Answer» F.
Discussion
35.

Specific speed (metric) = k x specific (FPS) where k has the value of

A. 0.67
B. 0.41
C. 2.37
D. 1.75
E. 1
Answer» B. 0.41
Discussion
36.

The statement "For laminar flow through a fine porous bed or capillary passages in a solid, the velocity based on the total cross-section is proportional to the ratio of pressure gradient to viscosity" is known as

A. Schmidt's law
B. Fick's law
C. Reynolds hypothesis
D. Stock's law
E. Darcy's law of permeability
Answer» F.
Discussion
37.

When power is transmitted through a considerable distance by means of water under pressure, the maximum power is transmitted when

A. Frictional loss of head is one third of the total head supplied
B. Frictional loss of head is 10% of the total head
C. Eficiency of transmission is 75%
D. Frictional loss of head is half of the total head supplied
E. Loss in transmission is 17.7%.
Answer» B. Frictional loss of head is 10% of the total head
Discussion
38.

Permissible velocity of water flowing through concrete tunnel is usually

A. 4 - 5 m/s
B. 12 - 12 m/s
C. 25 m/s
D. 20 m/s
E. 10 - 12 m/s
Answer» B. 12 - 12 m/s
Discussion
39.

The width of a weir with end contractions is

A. Equal to the width of the channel
B. Less than the width of the channel
C. Half the width of the channel
D. One fourth the width of the channel
E. None of the above
Answer» C. Half the width of the channel
Discussion
40.

A rocket exits exhaust gases with p = 0.5 kg m3 out a 50 cm dia nozzle at a velocity of 1200 m/s. Estimate the thrust, in kN

A. 140
B. 420
C. 40
D. 280
E. 90
Answer» B. 420
Discussion
41.

The density of air at 10?C and 1 Mpa abs in SI units is

A. 12.31
B. 1.231
C. 118.4
D. 65
E. None of the above
Answer» B. 1.231
Discussion
42.

105 N/m2 pressure is eqrivalent to

A. 1 bar
B. 750.06 mm Hg
C. 0.98682 atm
D. 401.85 m H2O
E. Any of the above
Answer» F.
Discussion
43.

In a completely turbulent flow the head loss

A. decreases with wall roughness
B. increases with the velocity squared
C. increases with flow rate
D. increases with the velocity
E. increases with diameter
Answer» C. increases with flow rate
Discussion
44.

For a floating ship to be in equilibrium the metacentre should be

A. below the centre of gravity
B. above the centre of gravity
C. exactly at the centre of gravity
D. close to centre of gravity
Answer» D. close to centre of gravity
Discussion
45.

The drag force on a 40 : 1 scale model of a ship is measured to be 10 N. What force, in kN, is expected on the ship?

A. 520
B. 160
C. 80
D. 640
E. 320
Answer» E. 320
Discussion
46.

The turbulent flow is hydraulically smooth if the ratio height of roughness projection/the thickness of laminar sub-layer is less than

A. 0.8
B. 1
C. 0.75
D. 0.5
E. 0.25
Answer» F.
Discussion
47.

Mixed flow turbine are

A. Radial inward flow type
B. Radial outward flow type
C. Partly rdial partly axial
D. Parallel flow type
E. None of the above
Answer» D. Parallel flow type
Discussion
48.

The highest voltage at which power is transmitted in India is

A. 440 kV
B. 400 kV
C. 11 kV
D. 132 kV
E. 33 kV
Answer» C. 11 kV
Discussion
49.

A 2m dia., 3 m high, cylindrical water tank is pressurized such that the pressure at the top is 20 kPa. The force in kN, acting on the bottom is

A. 176
B. 132
C. 106
D. 155
E. 195
Answer» E. 195
Discussion
50.

In isentropic flow, the temperature

A. Is a function of Mach number only
B. Is independent of Mach number
C. Cannot drop and then increase again downstream
D. Cannot exceed the reservoir temperature
E. Remains constant in a duct flow
Answer» E. Remains constant in a duct flow
Discussion