Q.1

If velocities of fluid particles vary from point to point in magnitude and direction, as well as from instant to instant, the flow is said to be

  • laminar
  • turbulent flow
  • uniform flow
  • non-uniform flow.
Q.2

To avoid vapourisation, pipe lines are laid over the ridge so that these are above the hydraulic gradient line, not more than

  • 2.4 m
  • 6.4 m
  • 10.0 m
  • 5.0 m.
Q.3

The best side slope for most economical trapezoidal section, is

  • 30°
  • 45°
  • 60°
  • None of these.
Q.4

An orifice is taken as large if

  • (H2 - H1) > H
  • (H2 - H1) > H/4
  • (H2 - H1) > H/2
  • (H2 - H1) > H/3
Q.5

The continuity equation

  • expresses the relationship between work and energy
  • relates the momentum per unit volume between two points on a stream line
  • relates mass rate of flow along a stream line
  • requires that Newton's second law of motion be satisfied at every point in fluid.
Q.6

For a most economical rectangular channel, the hydraulic mean depth, is equal to

  • the depth of flow
  • half the depth of flow
  • one-third depth of flow
  • None of these.
Q.7

The height of water level in a tank above the centre of a circular hole 2.5 cm in diameter ism. The velocity of water flowing through the hole, is

  • 31.1 m/sec
  • 31.2 m/sec
  • 31.3 m/sec
  • 31.4 m/sec.
Q.8

In fluids, steady flow occurs when

  • conditions of flow change steadily with time
  • conditions of flow do not change with time at a point
  • conditions of flow remain the same at adjacent point
  • velocity vector remains constant at a point.
Q.9

The rise of the liquid along the walls of a revolving cylinder above the initial level, is

  • greater than the depression of the liquid at the axis of rotation
  • lesser than the depression of the liquid at the axis of rotation
  • the same as the depression of the liquid at the axis of rotation
  • none of these.
Q.10

A jet projected at an angle of 45θ,m from the foot of a vertical column, just reaches the top of the column. The height of the column is

  • 15 m
  • 20 m
  • 30 m
  • 40 m
  • 60 m.
Q.11

The following is not a laminar flow

  • Flow of oil in measuring instruments
  • Flow in beds in ground water
  • Rise of water in plants through roots
  • Flow of blood in the arteries of human body
  • Flow in water pipe lines.
Q.12

A closed cylindrical vessel ofcm diameter andcm high is completely filled with a liquid (sp. weightkg/m3) when rotated about its vertical axis atr.p.m. The total pressure on its lid, is

  • 459 kg
  • 549 kg
  • 945 kg
  • 954 kg
  • 95.4 kg.
Q.13

Water displaced by a floating wooden block of density 0.5 m long, 2 m wide and 3 m high, is

  • 17.5 m3
  • 20.0 m3
  • 22.5 m3
  • 25 km3.
Q.14

A closed cylindrical vessel ofcm diameter andcm high is completely filled with a liquid (sp. weightkg/m3) when rotated about its vertical axis atr.p.m. The total pressure on its lid, is

  • 459 kg
  • 549 kg
  • 945 kg
  • 954 kg
  • 95.4 kg.
Q.15

Fluids change the volume under external presssure due to

  • plasticity
  • viscosity
  • compressibility
  • none of these.
Q.16

If Cv, Cc, Cd and Cr are the hydraulic coefficients of an orifice, then

  • Cd = Cc . Cv
  • Cr = 1 + Cv2/Cd
  • Cv = Cc + Cd
  • Cc = Cv/Cd
Q.17

Which one of the following statements is true ?

  • The value of kinetic energy correction factor for turbulent flow lies between 1.03 to 1.06
  • The value of kinetic energy correction factor for laminar flow is 2
  • The practical value of kinetic energy correction factor for turbulent flow is unity
  • all the above.
Q.18

The height of water level in a tank above the centre of a circular hole 2.5 cm in diameter ism. The velocity of water flowing through the hole, is

  • 31.1 m/sec
  • 31.2 m/sec
  • 31.3 m/sec
  • 31.4 m/sec.
Q.19

If Cv, Cc, Cd and Cr are the hydraulic coefficients of an orifice, then

  • Cd = Cc . Cv
  • Cr = 1 + Cv2/Cd
  • Cv = Cc + Cd
  • Cc = Cv/Cd
Q.20

Pick up the correct statement from the following :

  • The fluids which follow are known as Newtonian fluids
  • The fluids which do not follow the linear relationship between shear and rate of strain are known as non Newtonian fluids
  • The substances which flow after yield strains, are known as plastics
  • all the above.
Q.21

Water belongs to

  • Newtonian fluids
  • non-Newtonian fluids
  • compressible fluid
  • none of these.
Q.22

Pick up the correct statement from the following :

  • The fluids which follow are known as Newtonian fluids
  • The fluids which do not follow the linear relationship between shear and rate of strain are known as non Newtonian fluids
  • The substances which flow after yield strains, are known as plastics
  • all the above.
Q.23

The specific weight of water iskg/m3

  • at normal pressure of 760 mm
  • at 4°C temperature
  • at mean sea level
  • all the above.
Q.24

A fluid particle may possess the displacement of

  • translation
  • rotation
  • distortion
  • all the above.
Q.25

Specific weight of liquid

  • remains constant at every place
  • does not remain constant at every place
  • varies from place to place on the earth
  • does not vary on any other planet.
Q.26

In Chezy's formula V = C mi

  • V is the mean velocity of flow
  • m is the hydraulic mean depth
  • i is the loss of head per unit length of pipe
  • All the above.
Q.27

Atmospheric pressure is equal to water column head of

  • 9.81 m
  • 5.0 m
  • 10.30 m
  • 7.5 m.
Q.28

The width of a weir with end contraction, is

  • equal to the width of the channel
  • less than the width of the channel
  • half the width of the channel
  • none of these.
Q.29

Manning's formula is used for

  • flow in open channels
  • head loss due to friction in open channels
  • head loss due to friction in pipes flowing full
  • flow in pipes.
Q.30

In steady flow, which one of the following changes with time

  • velocity
  • pressure
  • density
  • none of these.
0 h : 0 m : 1 s