Hydraulics and Fluid Mechanics MCQs : This section focuses on the "Hydraulics and Fluid Mechanics". These Multiple Choice Questions (MCQs) should be practiced to improve the Hydraulics and Fluid Mechanics skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.
Question 1
A flow in which the volume of a fluid and its density does not change during the flow is called __________ flow.
A. incompressible
B. compressible
Question 2
A manometer is used to measure
A. low pressure
B. moderate pressure
C. high pressure
D. atomospheric pressure
Question 3
A siphon is used to connect two reservoirs at different levels intervened by a high ridge.
A. TRUE
B. FALSE
Question 4
A structure whose width is __________ the width of the channel, is called a flumed structure.
A. less than
B. more than
Question 5
A vertical wall is subjected to a pressure due to one kind of liquid, on one of its sides. The total pressure on the wall per unit length is (where w = Specific weight of liquid, and H = Height of liquid)
A. wH
B. wH/2
C. wH2/2
D. wH2/3
Question 6
A weir is said to be broad crested weir, if the width of the crest of the weir is __________ half the height of water above the weir crest.
A. equal to.
B. less than
C. more than
Question 7
According to equation of continuity,
A. w1a1 = w2a2
B. w1v1 = w2v2
C. a1v1 = a2v2
D. a1/v1 = a2/v2
Question 8
An error of 1% in measuring head over the apex of the notch (H) will produce an error of __________ in discharge over a triangular notch.
A. 1%
B. 1.50%
C. 2%
D. 2.50%
Question 9
An ideal fluid is frictionless and incompressible.
A. Correct
B. Incorrect
Question 10
Coefficient of contraction is the ratio of
A. actual velocity of jet at vena contracta to the theoretical velocity
B. loss of head in the orifice to the head of water available at the exit of the orifice
C. actual discharge through an orifice to the theoretical discharge
D. area of jet at vena contracta to the area of orifice
Question 11
Coefficient of resistance is the ratio of
A. actual velocity of jet at vena contracta to the theoretical velocity
B. area of jet at vena contracta to the area of orifice
C. loss of head in the orifice to the head of water available at the exit of the orifice
D. actual discharge through an orifice to the dieoretical discharge
Question 12
If a body floating in a liquid returns back to its original position, when given a small angular displacement, the body is said to be in
A. neutral equilibrium
B. stable equilibrium
C. unstable equilibrium
D. none of these
Question 13
In a depressed nappe
A. the pressure below the nappe is atmospheric
B. the pressure below the nappe is negative
C. the pressure above the nappe is atmospheric
D. the pressure above the nappe is negative
Question 14
In a free nappe,
A. the pressure below the nappe is atmospheric
B. the pressure below the nappe is negative
C. the pressure above the nappe is atmospheric
D. the pressure above the nappe is negative
Question 15
In a venturimeter, the velocity of liquid at throat is __________ than at inlet.
A. higher
B. lower
Question 16
In an external mouthpiece, the absolute pressure head at vena contracta is __________ the atmospheric pressure head by an amount equal to 0.89 times the height of the liquid, above the vena contracta.
A. less than
B. more than
Question 17
In one dimensional flow, the flow
A. is steady and uniform
B. takes place in straight line
C. takes place in curve
D. takes place in one direction
Question 18
In open channels, the specific energy is the
A. total energy per unit discharge
B. total energy measured with respect to the datum passing through the bottom of the channel
C. total energy measured above the horizontal datum
D. kinetic energy plotted above the free surface of water
Question 19
In order to measure the flow with a venturimeter, it is installed in
A. horizontal line
B. inclined line with flow upwards
C. inclined line with flow downwards
D. any direction and in any location
Question 20
One litre of water occupies a volume of
A. 100 cm3
B. 250 cm3
C. 500 cm3
D. 1000 cm3
Question 21
The Bernoulli's equation is based on the assumption that
A. there is no loss of energy of the liquid flowing
B. the velocity of flow is uniform across any cross-section of the pipe
C. no force except gravity acts on the fluid
D. all of the above
Question 22
The body will sink down if the force of buoyancy is __________ the weight of the liquid displaced.
A. equal to
B. less than
C. more than
Question 23
The centre of buoyancy is the centre of area of the immersed body.
A. Correct
B. Incorrect
Question 24
The centre of gravity of the volume of the liquid displaced is called
A. centre of pressure
B. centre of buoyancy
C. metacentre
D. none of these
Question 25
The coefficient of discharge for an external mouthpiece is
A. 0.375
B. 0.5
C. 0.707
D. 0.855
Question 26
The coefficient of viscosity may be determined by
A. capillary tube method
B. orifice type viscometer
C. rotating cylinder method
D. all of these
Question 27
The discharge over a rectangular notch is (where b = Width of notch, and H = Height of liquid, above the sill of the notch)
A. Cd x b2gH
B. Cd x b2g x H
C. Cd x b2g x H3/2
D. Cd x b2g x H2
Question 28
The discharge over a right angled notch is (where H = Height of liquid above the apex of notch)
A. Cd 2g x H
B. Cd 2g x H3/2
C. Cd 2g x H2
D. Cd 2g x H5/2
Question 29
The discharge through a large rectangular orifice is given by (where H1 = Height of the liquid above the top of the orifice, H2 = Height of the liquid above the bottom of the orifice, b = Breadth of the orifice, and Cd = Coefficient of discharge)
A. Q = Cd x b2g(H2 - H1)
B. Q = Cd x b2g(H21/2 - H11/2)
C. Q = Cd x b2g(H23/2 - H13/2)
D. Q = Cd x b2g(H22 - H12)
Question 30
The discharge through a siphon spillway is
A. Cd x a2gH
B. Cd x a2g x H3/2
C. Cd x a2g x H2
D. Cd x a2g x H5/2
Question 31
The kinematic viscosity is the
A. ratio of absolute viscosity to the density of the liquid
B. ratio of density of the liquid to the absolute viscosity
C. product of absolute viscosity and density of the liquid
D. product of absolute viscosity and mass of the liquid
Question 32
The loss of head due to an obstruction in a pipe is twice the loss of head at its entrance.
A. Agree
B. Disagree
Question 33
The loss of head due to friction in a pipe of uniform diameter in which a viscous flow is taking place, is (where RN = Reynold number)
A. 1/RN
B. 4/RN
C. 16/RN
D. 64/RN
Question 34
The maximum discharge over a broad crested weir is
A. 0.384 Cd x L x H1/2
B. 0.384 Cd x L x H3/2
C. 1.71 Cd x L x H1/2
D. 1.71 Cd x L x H3/2
Question 35
The maximum efficiency of transmission through a pipe is
A. 50%
B. 56.70%
C. 66.67%
D. 76.66%
Question 36
The metacentric heights of two floating bodies A and B are 1 m and 1.5 m respectively. Select the correct statement.
A. The bodies A and B have equal stability
B. The body A is more stable than body B
C. The body B is more stable than body A
D. The bodies A and B are unstable
Question 37
The power transmitted through a pipe is (where w = Specific weight in N/m3, and Q = Discharge in m3/s)
A. w x Q x H
B. w x Q x hf
C. w x Q (H - hf)
D. w x Q (H + hf)
Question 38
The pressure less than atmospheric pressure is known as
A. suction pressure
B. vacuum pressure
C. negative gauge pressure
D. all of these
Question 39
The pressure measured with the help of a piezometer tube is in
A. N/mm2
B. N/m2
C. head of liquid
D. all of these
Question 40
The Reynold's number of a ship is __________ to its velocity and length.
A. directly proportional
B. inversely proportional
Question 41
The stability of a dam is checked for
A. tension at the base
B. overturning of the wall or dam
C. sliding of the wall or dam
D. all of these
Question 42
The total energy line lies over the hydraulic gradient line by an amount equal to the
A. pressure head
B. velocity head
C. pressure head + velocity head
D. pressure head - velocity head
Question 43
The value of bulk modulus of a fluid is required to determine
A. Reynold's number
B. Froude's number
C. Mach number
D. Euler's number
Question 44
The weight per unit volume of a liquid at a standard temperature and pressure is called
A. specific weight
B. mass density
C. specific gravity
D. none of these
Question 45
When a tube of smaller diameter is dipped in water, the water rises in the tube due to viscosity of water.
A. TRUE
B. FALSE
Question 46
Which of the following is an example of laminar flow?
A. Under ground flow
B. Flow past tiny bodies
C. Flow of oil in measuring instruments
D. all of these
Question 47
In a two dimensional incompressible steady flow around an airfoil, the stream lines are 2 cm apart at a great distance from the airfoil, where the velocity is 30 m/sec. The velocity near the airfoil, where the stream lines are 1.5 cm apart, is
A. 22.5 m/sec.
B. 33 m/sec.
C. 40 m/sec.
D. 90 m/sec.
Question 48
The difference of pressure between the inside and outside of a liquid drop is
A. (a)p = Txr
B. (b)p = T/r
C. p = T/2r
D. (d)p = 2T/r
Question 49
Fluid is a substance that
A. cannot be subjected to shear forces
B. always expands until it fills any container
C. has the same shear stress.at a point regardless of its motion
D. cannot remain at rest under action of any shear force
Question 50
The line of action of the buoyant force acts through the
A. centroid of the volume of fluid vertically above the body
B. center of the volume of floating body
C. center of gravity of any submerged body
D. centriod of the displaced volume of fluid
Question 51
A vertical rectangular plane surface is submerged in water such that its top and bottom surfaces are 1.5 m and 6.0 m res-pectively below the free surface. The position of center of pressure below the free surface will be at a distance of
A. 3.75 m
B. 4.0 m
C. 4.2m
D. 4.5m
Question 52
An object having 10 kg mass weighs 9.81kg on a spring balance. The value of ‘g’ at this place is
A. 10m/sec²
B. 9.81 m/sec²
C. 10.2/m sec
D. 9.75 m/sec²
Question 53
Steady flow occurs when
A. the direction and magnitude of the velocity at all points are identical
B. the velocity of successive fluid par-ticles, at any point, is the same at suc-cessive periods of time
C. the magnitude and direction of the velocity do not change from point to point in the fluid
D. the fluid particles move in plane or parallel planes and the streamline pat-terns are identical in each plane
Question 54
The shear stress distribution for a fluid flowing in between the parallel plates, both at rest, is
A. constant over the cross section
B. parabolic distribution across the section
C. zero at the mid plane and varies linearly with distance from mid plane
D. zero at plates and increases linearly to midpoint
Question 55
Thee horizontal component of buoyant force is
A. negligible
B. same as buoyant force
C. zero
D. none of the above
Question 56
Metacentric height is given as the distance between
A. the center of gravity of the body andthe meta center
B. the center of gravity of the body and the center of buoyancy
C. the center of gravity of the body and the center of pressure
D. center of buoyancy and metacentre
Question 57
The theoretical value of coefficient of contraction of a sharp edged orifice is
A. 0.611
B. 0.85
C. 0.98
D. 1
Question 58
The discharge of a liquid of kinematic viscosity 4 cm²/sec through a 8 cm dia-meter pipe is 3200n cm7sec. The type of flow expected is
A. laminar flow
B. transition flow
C. turbulent flow
D. not predictable from the given data
Question 59
Separation of flow occurs when
A. the pressure intensity reaches a minimum
B. the cross-section of a channel is reduced
C. the boundary layer comes to rest
D. all of the above
Question 60
Two dimensional flow occurs when
A. the direction and magnitude of the velocity at all points are identical
B. the velocity of successive fluid par-ticles, at any point, is the same at suc-cessive periods of time
C. the magnitude and direction of the velocity do not change from point to point in the fluid
D. the fluid particles move in plane or parallel planes and the streamline pat-terns are identical in each plane
Question 61
Uniform flow occurs when
A. the flow is steady
B. the flow is streamline
C. size and shape of the cross section in a particular length remain constant
D. size and cross section change uniformly along length
Question 62
Surface tension has the units of
A. newtons/m2
B. newtons/cm
C. newtons/m
D. newtons
Question 63
The horse power transmitted through a pipe is maximum when the ratio of loss of head due to friction and total head supplied is
A. 1-3
B. 1-4
C. 1-2
D. 2-3
Question 64
According to Bernoulli’s equation for steady ideal fluid flow
A. principle of conservation of mass holds
B. velocity and pressure are inversely proportional
C. total energy is constant throughout
D. the energy is constant along a stream-line but may vary across streamlines
Question 65
When a liquid rotates at a constant angular velocity about a vertical axis as a rigid body, the pressure intensity varies
A. linearly with radial distance
B. as the square of the radial distance
C. inversely as the square of the radial distance
D. inversely as the radial distance
Question 66
The density of water is 1000 kg/m3 at
A. 0°C
B. 0°K
C. 4°C
D. 20°C
Question 67
Which of the following is demensionless
A. specific weight
B. specific volume
C. specific speed
D. specific gravity
Question 68
A large Roynold number is indication of
A. smooth and streamline flow
B. laminar flow
C. turbulent flow
D. highly turbulent flow.
Question 69
The peoperty by virtue of which a liquid opposes relative motion between its different layers is called
A. surface tension
B. co-efficient of viscosity
C. viscosity
D. osmosis
Question 70
Ay between two stream lines represents
A. velocity
B. discharge
C. head
D. pressure
Question 71
The continuity equation pi V,A,= p2V2A2 is based on the following assumption regarding flow of fluid (where pi and p2 are mass densities.)
A. steady flow
B. uniform flow
C. incompressible flow
D. frictionless flow
Question 72
The position of center of pressure on a plane surface immersed vertically in a static mass of fluid is
A. at the centroid of the submerged area
B. always above the centroid of the area
C. always below the centroid of the area
D. none of the above
Question 73
The Prartdtl mixing length is
A. zero at the pipe wall
B. maximum at the pipe wall
C. independent of shear stress
D. none of the above
Question 74
The discharge through a V- notch varies as
A. H1/2
B. H3’2
C. H5/2
D. H5’4 where H is head.
Question 75
The units of viscosity are
A. metre2/sec
B. kg sec/metre
C. newton-sec/metre2
D. newton-sec/metre
Question 76
If a sphere of diameter 1 cm falls in castor oil of kinematic viscosity 10 stokes, with a terminal velocity of 1.5 cm/sec, the coefficient of drag on the sphere is
A. less than 1
B. between 1 and 100
C. 160
D. 200
Question 77
When a body floating in a liquid, is displaced slightly, it oscillates about
A. e.g. of body
B. center of pressure
C. center of buoyancy
D. metacentre
Question 78
The total pressure force on a plane area is equal to the area multiplied by the intensity of pressure at the centriod, if
A. the area is horizontal
B. the area is vertical
C. the area is inclined
D. all of the above
Question 79
Operation of McLeod gauge used for low pressure measurement is based on the principle of
A. gas law
B. Boyle’s law
C. Charle’s law
D. Pascal’s law
Question 80
The pressure in Pascals at a depth of 1 m below the free surface of a body of water will be equal to
A. 1 Pa
B. 91 Pa
C. 981 Pa
D. 9810 Pa
Question 81
True one-dimensional flow occurs when
A. the direction and magnitude of the veiocity at all points are identical
B. the velocity of successive fluid par-ticles, at any point, is the same at suc-cessive periods of time
C. the magnitude and direction of the velocity do not change from point to point in the fluid
D. the fluid particles move in plane or parallel planes and the streamline pat-terns are identical in each plane
Question 82
Non uniform flow occurs when
A. the direction and magnitude of the velocity at all points are identical
B. the velocity of successive fluid par-ticles, at any point, is the same at suc-cessive periods of time
C. the fluid particles move in plane or parallel planes and the streamline pat-terns are identical in each plane
D. velocity, depth, pressure, etc. change from point to point in the fluid flow.
Question 83
In a Sutro weir, the discharge is proportional to (where H is head)
A. H1/2
B. H3/2
C. H5/2
D. H
Question 84
A perfect gas
A. has constant viscosity
B. is incompressible
C. is of theoretical interest
D. none of the above.
Question 85
For a floating body to be in stable equilibrium, its metacentre should be
A. below the center of buoyancy
B. above the center of buoyancy
C. between e.g. and center of pressure
D. above the center of gravity.
Question 86
The resultant of all normal pressures acts
A. at e.g. of body
B. at center of pressure
C. vertically upwards
D. at metacentre
Question 87
Pressure of the order of 10''' torr can be measured by
A. Bourdon tube
B. Pirani Gauge
C. micro-manometer
D. ionisastion gauge
Question 88
Flow of water in a pipe about 3 meters in diameter can be measured by
A. orifice plate
B. venturi
C. rotameter
D. pitot tube
Question 89
An ideal fluid is
A. one which obeys Newton’s law of viscosity
B. frictionless and incompressible
C. very viscous
D. frictionless and compressible
Question 90
In which of the following the friction drag is generally larger than pressure drag?
A. a circular disc or plate held normal to flow
B. a sphere
C. a cylinder
D. an airfoil
Question 91
Choose the wrong statement.Alcohol is used in manometer, because
A. its vapour pressure is low
B. it provides suitable meniscus for the inclined tube
C. its density is less
D. it provides longer length for a given pressure difference
Question 92
At the centre line of a pipe flowing under pressure where the velocity gradient is zero, the shear stress will be
A. minimum
B. maximum
C. negative value
D. could be any value
Question 93
The unit of kinematic viscosity is
A. gm/cm-sec²
B. dyne-sec/cm²
C. gm/cm²-sec
D. cm²/sec
Question 94
An open cubical tank of 2 m side is filled with water. If the tank is rotated with an acceleration such that half of the water spills out, then the acceleration is equal to
A. g/3
B. g/2
C. 2g/3
D. g
Question 95
Newton’s law of viscosity is a relationship between
A. shear stress anctthejiate of angular distortion
B. shear stress and viscosity
C. shear stress, velocity and viscosity
D. pressure, velocity and viscosity
Question 96
For a floating body to be in equilibrium
A. meta center should be above e.g.
B. center of buoyancy and e.g. must lie on same vertical plane
C. a righting couple should be formed
D. all of the above
Question 97
Resultant pressure of the liquid in the case of an immersed body acts through
A. center of gravity
B. center of pressure
C. metacentre
D. center of buoyancy
Question 98
Buoyant force is
A. resultant force acting on a floating body
B. equal to the volume of liquid displaced
C. force necessary to keep a body in equilibrium
D. the resultant force on a body due to the fluid surrounding it
Question 99
Coefficient of contraction for an external cylindrical mouthpiece is
A. 1
B. 0.855
C. 0.7H
D. 0.611
Question 100
The ratio of average velocity to maximum velocity for steady laminar flow in circular pipes is
A. 1-2
B. 2-3
C. 3-2
D. 2
Question 101
A liquid compressed in cylinder has a volume of 0.04 m3 at 50 kg/cm² and a volume of 0.039 m3 at 150 kg/cm². The bulk modulus of elasticity of liquid is
A. 400 kg/cm²
B. 4000 kg/cm²
C. 40 x 105 kg/cm²
D. 40 x 106 kg/cm²
Question 102
Froude number is significant in
A. supersonics, as with projectile and jet propulsion
B. full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc
C. simultaneous motion through two fluids where there is a surface of dis-continuity, gravity forces, and wave making effect, as with ship’s hulls
D. all of the above
Question 103
Reynolds number is significant in
A. supersonics, as with projectile and jet propulsion
B. full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc
C. simultaneous motion through two fluids where there is a surface of dis-continuity, gravity forces, and wave making effect, as with ship’s hulls
D. all of the above
Question 104
Mach number is significant in
A. supersonics, as with projectiles and jet propulsion
B. full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc
C. simultaneous motion through two fluids where there is a surface of dis-continuity, gravity force, and wave making effects, as with ship’s hulls
D. all of fhe above
Question 105
The viscosity of a gas
A. decreases with increase in temperature
B. increases with increase in temperature
C. is independent of temperature
D. is independent of pressure for very high pressure intensities
Question 106
The pressure at the summit of a syphon is
A. equal to atmospheric
B. less than atmospheric
C. more than atmospheric
D. none of the above
Question 107
In a free vortex motion, the radial component of velocity everywhere is
A. maximum
B. minimum
C. zero
D. non-zero and finite
Question 108
A fluid in equilibrium can’t sustain
A. tensile stress
B. compressive stress
C. shear stress
D. bending stress
Question 109
If velocity is zero over l/3rd of a cross-section and is uniform over remaining 2/3rd of the cross-section, then the correction factor for kinetic energy is
A. 4-3
B. 3-2
C. 9-4
D. 27/8
Question 110
With the same cross-sectional area and immersed in same turbulent flow, the largest total drag will be on
A. a circular disc of plate held normal to flow
B. a sphere
C. a cylinder
D. a streamlined body
Question 111
If the atmospheric pressure on the surface of an oil tank (sp. gr. 0.8) is 0.2 kg/cm”, the pressure at a depth of 50 m below the oil surface will be
A. 2 meters of water column
B. 3 meters of water column
C. 5 meters of water column
D. 6 meters of water Column
Question 112
The pressure in the air space above an oil (sp. gr. 0.8) surface in a tank is 0.1 kg/cm”. The pressure at 2.5 m below the oil surface will be
A. 2 meters of water column
B. 3 meters of water column
C. 3.5 meters of water column
D. 4 m of water column
Question 113
The hydraulic grade line is
A. always above the centre line of pipe
B. never above the energy grade line
C. always sloping downward in the direction of flow
D. all of the above
Question 114
Choose the wrong statement
A. The horizontal component of the hydro-static force on any surface is equal to the normal force on the vertical projection of the surface
B. The horizontal component acts through the center of pressure for the vertical projection
C. The vertical component of the hydrostatic force on any surface is equal to the weight of the volume of the liquid above the area
D. he vertical component passes through the center of pressure of the volume
Question 115
In a forced vortex motion, the velocity of flow is
A. directly proportional to its radial distance from axis of rotation
B. inversely proportional to its radial distance from the axis of rotation
C. inversely proportional to the square of its radial distance from the axis of rotation
D. directly proportional to the square of its radial distance from the axis of rotation
Question 116
When the flow parameters at any given instant remain same at every point, then flow is said to be
A. quasi static
B. steady state
C. laminar
D. uniform
Question 117
If the dynamic viscosity of a fluid is 0.5 poise and specific gravity is 0.5, then the kinematic viscosity of that fluid in stokes is
A. 0.25
B. 0.5
C. 1
D. none of the above
Question 118
An ideal flow of any fluid must satisfy
A. Pascal law
B. Newton’s law of viscosity
C. boundary layer theory
D. continuity equation
Question 119
An open tank contains 1 m deep water with 50 cm depth of oil of specific gravity 0.8 above it. The intensity of pressure at the bottom of tank will be
A. 4 kN/m2
B. 10 kN/m2
C. 12 kN/m2
D. 14 kN/m2
Question 120
Which of the following statements is correct?
A. Lower critical Reynolds number is of no practical significance in pipe flow problems.
B. Upper critical Reynolds number is significant in pipe flow problems.
C. Lower critical Reynolds number has the value 2000 in pipe flow
D. Upper critical Reynolds number is the number at which turbulent flow changes to laminar flow.
Question 121
Centre of pressure compared to e.g. is
A. above it
B. below it
C. at same point
D. above or below depending on area of body
Question 122
The resultant upward pressure of a fluid on a floating body is equal to the weight of the fluid displaced by the body. This definition is according to
A. Buoyancy
B. Equilibrium of a floating body
C. Archimedes’ principle
D. Bernoulli’s theorem
Question 123
If the elevation of hydraulic grade line at the junction of three pipes is above the elevation of reservoirs B and C and below reservoir A, then the direction of flow will be
A. from reservoir A to reservoirs B and C
B. from reservoir B to reservoirs C and A
C. from reservoir C to reservoirs A and B
D. unpredictable
Question 124
Pascal-second is the unit of
A. pressure
B. kinematic viscosity
C. dynamic viscosity
D. surface tension
Question 125
Which of the following is the unit of kinematic viscosity
A. pascal
B. poise
C. stoke
D. faraday
Question 126
Ratio of inertia force to surface Jension is known as
A. Mach number
B. Froude number
C. Reynold’s number
D. Weber’s number
Question 127
Which of the following has highest coefficient of discharge ?
A. sharp edged orifice
B. venturimeter
C. Borda’s mouthpiece running full
D. CipoUetti weir
Question 128
A right circular cylinder open at the top is filled with liquid and rotated about its vertical axis at such a speed that half the liquid spills out, then the pressure intensity at the center of bottom is
A. zero
B. one-fourth its value when cylinder was full
C. one-half its value when cylinder was full
D. cannot be predicted from the given data
Question 129
Stanton diagram is a
A. log-log plot of friction factor against Reynolds number
B. log-log plot of relative roughness against Reynolds number
C. semi-log plot of friction factor against Reynolds number
D. semi-log plot of friction factor against relative roughness
Question 130
A closed tank containing water is moving in a horizontal direction along a straight line at a constant speed. The tank also contains a steel ball and a bubble of air. If the tank is decelerated horizontally, theni) the ball will move to the frontii) the bubble will move to the frontiii) the ball will move to the reariv) the bubble will move to the rear Find out which of the above statements are correct ?
A. (i) and (ii)
B. (i) and (iv)
C. (ii) and (iii)
D. (iii) and (iv)
Question 131
In steady flow of a fluid, the total accele ration of any fluid particle
A. can be zero
B. is never zero
C. is always zero
D. is independent of coordinates
Question 132
The point in the immersed body through which the resultant pressure of the liquid may be taken to act is known as
A. center of gravity
B. center of buoyancy
C. center of pressure
D. metacentre
Question 133
When time of closure tc = L/v0 (where L is length of pipe and v0 is speed of pressure wave), the portion of pipe length subjected to maximum head is
A. L/4
B. L/3
C. L/2
D. L
Question 134
The property of fluid by virtue of which it offers resistance to shear is called
A. surface tension
B. adhesion
C. cohesion
D. viscosity
Question 135
Two pipes of same length and diameters d and 2d respectively are connected in series. The diameter of an equivalent pipe of same length is
A. less than d
B. between d and 1.5 d
C. between 1.5 d and 2d
D. greater than 2d
Question 136
In case of an airfoil, the separation of flow occurs
A. at the extreme rear of body
B. at the extreme front of body
C. midway between rear and front of body
D. any where between rear and front of body depending upon Reynolds number
Question 137
Flow at constant rate through a tapering pipe isi) steady flowii) uniform flowiii) unsteady flowiv) non-uniform flowThe correct answer is
A. (i) and (ii)
B. (i)and(iv)
C. (ii) and (iii)
D. (ii) and (iv)
Question 138
Drag force is a function ofi) projected area of the bodyii) mass density of the fluidiii) velocity of the bodyThe correct answer is
A. (i) and (ii)
B. (i) and (iii)
C. (ii) and (iii)
D. (i), (ii) and (iii)
Question 139
The increase in meta centric heighti) increases stabilityii) decreases stabilityiii) increases comfort for passengersiv) decreases comfort for passengersThe correct answer is
A. (i) and (iii)
B. (i) and (iv)
C. (ii) and (iii)
D. (ii) and (iv)
Question 140
Select the correct statement
A. Local atmospheric pressure depends upon elevation of locality only
B. Standard atmospheric pressure is the mean local atmospheric pressure a* sea level
C. Local atmospheric pressure is always below standard atmospheric pressure
D. A barometer reads the difference be-tween local and standard atmospheric pressure
Question 141
Least possible value of correction factor fori) kinetic energy is zeroii) kinetic energy is 1iii) momentum is zeroiv) momentum is 1The correct statements are
A. (i) and (iii)
B. (ii) and (iii)
C. (i) and (iv)
D. (ii) and (iv)
Question 142
Choose the wrong statement
A. fluids are capable of flowing
B. fluids conform to the shape of the con-taining vessels
C. when in equilibrium, fluids cannot sustain tangential forces
D. when in equilibrium, fluids can sustain shear forces
Question 143
For laminar flow in a pipe of circular cross-section, the Darcy’s friction factor f is
A. directly proportional to Reynolds number and independent of pipe wall roughness
B. directly proportional to pipe wall roughness and independent of Reynolds number
C. inversely proportional to Reynolds number and indpendent of pipe wall roughness
D. inversely proportional to Reynolds number and directly proportional to pipe wall roughness
Question 144
For measuring flow by a venturimeter, if should be installed in
A. vertical line
B. horizontal line
C. inclined line with upward flow
D. in any direction and in any location.
Question 145
Which of the following instrument can be used for measuring speed of an aeroplane
A. Venturimeter
B. Orifice plate
C. rotameter
D. pitot tube
Question 146
A ship whose hull length is 100 m is to travel at 10 m/sec. For dynamic similarity, at what velocity should a 1:25 model be towed through water ?
A. 10 m/sec
B. 25 m/sec
C. 2 m/sec
D. 50 m/sec
Question 147
For a sphere of radius 15 cm moving with a uniform velocity of 2 m/sec through a liquid of specific gravity 0.9 and dynamic viscosity 0.8 poise, the Reynolds number will be
A. 300
B. 337.5
C. 600
D. 675
Question 148
The discharge over a broad crested weir is maximum when the depth of flow is (where H is the available head)
A. H/3
B. H/2
C. 2 H/5
D. 2 H/3
Question 149
Two pipe systems are said to be equivalent when
A. head loss and discharge are same in two systems
B. length of pipe and discharge are same in two systems
C. friction factor and length are same in two systems
D. length and diameter are same in two systems
Question 150
A model of torpedo is tested in a towing tank at a velocity of 25 m/sec. The prototype is expected to attain a velocity of 5 m/sec. What model scale has been used ?
A. 1 : 5
B. 1 : 2.5
C. 1 :25
D. 01:50
Question 151
A fluid is said to be ideal, if it is
A. incompressible
B. inviscous
C. inviscous and compressible
D. inviscous and incompressible.
Question 152
The horizontal component of force on a curved surface is equal to the
A. product of pressure intensity at its centroid and area
B. force on a vertical projection of the curved surface
C. weight of liquid vertically above the curved surface
D. force on the horizontal projection of the curved surface
Question 153
The distance from pipe boundary, at which the turbulent shear stress is one-third die wall shear stress, is (where R is the radius of pipe)
A. 1/3 R
B. 1/2 R
C. 2/3 R
D. 3/4 R
Question 154
Coefficient of velocity for Borda’s mouth piece running full is
A. 0.611
B. 0.707
C. 0.855
D. 1
Question 155
Which of the following is used to measure the discharge ?
A. current meter
B. venturimeter
C. pitot tube
D. hotwire anemometer
Question 156
Choose the wrong statement
A. The center of buoyancy is located at the center of gravity of the displaced liquid
B. For stability of a submerged body, the center of gravity of body must lie directly below the center of buoyancy
C. For stability of floating cylinders or spheres, the e.g. of body must lie below the center of buoyancy
D. All floating bodies are stable
Question 157
Surge wave in a rectangular channel is an example ofi) steady flowii) unsteady flowiii) uniform flowiv) non-uniform flowThe correct answer is
A. (i) and (iii)
B. (ii) and (iii)
C. (i) and (iv)
D. (ii) and (iv)
Question 158
The center of gravity of the volume of the liquid displaced by an immersed body is called
A. center of gravity
B. center of pressure
C. metacentre
D. center of buoyancy
Question 159
The center of gravity of the volume of the liquid displaced by an immersed body is called
A. meta-center
B. center of pressure
C. center of buoyancy
D. center of gravity
Question 160
The resultant upward pressure of the fluid on an immersed body due to its tendency to uplift the sub-merged body is called
A. upthrust
B. reaction
C. buoyancy
D. metacentre
Question 161
The resultant upward pressure of the fluid on an immersed body is called
A. upthrust
B. buoyancy
C. center of pressure
D. all the above are correct
Question 162
Which of the following meters is not associated with viscosity
A. Red wood
B. Say bolt
C. Engler
D. Orsat
Question 163
Due to each end contraction, the discharge of rectangular sharp crested weir is reduced by
A. 5%
B. 10%
C. 15%
D. 20%
Question 164
The process of diffusion of one liquid into the other through a semi-permeable membrane is called
A. viscosity
B. osmosis
C. surface tension
D. cohesion
Question 165
The boundary layer thickness at a distance of l m from the leading edge of a flat plate, kept at zero angle of incidence to the flow direction, is O.l cm. The velocity outside the boundary layer is 25 ml sec. The boundary layer thickness at a distance of 4 m is (Assume that boundary layer is entirely laminar)
A. 0.40 cm
B. 0.20 cm
C. 0.10 cm
D. 0.05 cm
Question 166
If a vessel containing liquid moves downward with a constant acceleration equal to ‘g’ then
A. the pressure throughout the liquid mass is atmospheric
B. there will be vacuum in the liquid
C. the pressure in the liquid mass is greater than hydrostatic pressure
D. none of the above
Question 167
In an immersed body, center of pressure is
A. at the center of gravity
B. above the center of gravity
C. below be center of gravity
D. could be above or below e.g. depending on density of body and liquid
Question 168
In an isothermal atmosphere, the pressure
A. decreases linearly with elevation
B. remains constant
C. varies in the same way as the density
D. increases exponentially with elevation
Question 169
To avoid an interruption in the flow of a syphon, an air vessel is provided
A. at the inlet
B. at the outlet
C. at the summit
D. ay nay point between inlet and outlet
Question 170
Working principle of dead weight pressure gauge tester is based on
A. Pascal’s law
B. Dalton’s law of partial pressure
C. Newton’s law of viscosity
D. Avogadro’s hypothesis
Question 171
The stress-strain relation of the newtoneon fluid is
A. linear
B. parabolic
C. hyperbolic
D. inverse type
Question 172
Centre of buoyancy always
A. coincides with the centre of gravity
B. coincides with the centroid of the volume of fluid displaced
C. remains above the centre of gravity
D. remains below the centre of gravity
Question 173
Choose the wrong statement
A. Viscosity of a fluid is that property which determines the amount of its resistance to a shearing force
B. Viscosity is due primarily to interaction between fluid molecules
C. Viscosity of liquids decreases with in-crease in temperature
D. Viscosity of liquids is appreciably affected by change in pressure
Question 174
Center of buoyancy is the
A. centroid of the displaced volume of fluid
B. center of pressure of displaced volume
C. e.g. of floating body
D. does not exist
Question 175
Equation of continuity is based on the principle of conservation of
A. mass
B. energy
C. momentum
D. none of the above
Question 176
Metacentre is the point of intersection of
A. vertical upward force through e.g. of body and center line of body
B. buoyant force and the center line of body
C. mid point between e.g. and center of buoyancy
D. all of the above
Question 177
A streamline is defined as the line
A. parallel to central axis flow
B. parallel to outer surface of pipe
C. of equal yelocity in a flow
D. along which the pressure drop is uniform
Question 178
The conditions for the stable equilibrium of a floating body are
A. the meta-center should lie above the center of gravity
B. the center of buoyancy and the center of gravity must lie on the same vertical line
C. a righting couple should be formed
D. all the above are correct
Question 179
The upper surface of a weir over which water flows is known is
A. crest
B. nappe
C. sill
D. weir top
Question 180
Ratio of inertia force to elastic force is known as
A. Mach number
B. Froude number
C. Reynold’s number
D. Weber’s number
Question 181
The major loss of energy in long pipes is due to
A. sudden enlargement
B. sudden contraction
C. gradual contraction or enlargement
D. friction
Question 182
For very great pressures, viscosity of moss gases and liquids
A. remains same
B. increases
C. decreases
D. shows erratic behaviour
Question 183
Which of the following manometer has highest sensitivity
A. U-tube with water
B. inclined U-tube
C. U-tube with mercury
D. micro-manometer with water
Question 184
The correct relationship among displacement thickness d, momentum thickness m and energy thickness e is
A. d > m > e
B. d > e > m
C. e > m > d
D. e > d > m
Question 185
The velocity distribution for laminar flow through a circular tube
A. is constant over the cross-section
B. varies linearly from zero at walls to maximum at centre
C. varies parabolically with maximum at the centre
D. none of the above
Question 186
The flow in which each liquid particle has a definite path and their paths do not cross each other is called
A. one dimensional flow
B. uniform flow
C. turbulent flow
D. streamline flow
Question 187
If w is the specific weight of liquid and k the depth of any point from the surface, then pressure intensity at that point will be
A. h
B. wh
C. w/h
D. h/w
Question 188
All the terms of energy in Bernoulli’s equation have dimension of
A. energy
B. work
C. mass
D. length
Question 189
The depth ‘d’ below the free surface at which the point velocity is equal to the average velocity of flow for a uniform laminar flow with a free surface, will be (where D is the depth of flow)
A. 0.423 D
B. 0.577 D
C. 0.223 D
D. 0.707 D
Question 190
For a body floating in a liquid the normal pressure exerted by the liquid acts at
A. bottom surface of the body
B. e.g. of the body
C. metacentre
D. all points on the surface of the body
Question 191
For laminar flow in circular pipes, the Darcy’s friction factor f is equal to
A. 16/Re
B. 32/ Re
C. 64/ Re
D. none of the above where Re is Reynolds number.
Question 192
The eddy viscosity for turbulent flow is
A. a function of temperature only
B. a physical property of the fluid.
C. dependent on the flow
D. independent of the flow
Question 193
For hydro-dynamically smooth boundary, the friction coefficient for turbulent flow is
A. constant
B. dependent only on Reynolds number
C. a function of Reynolds number and relative roughness
D. dependent on relative roughness only
Question 194
Two pipe systems can be said to be equivalent, when the following quantites are same
A. friction loss and flow
B. length and diameter
C. flow and length
D. friction factor and diameter
Question 195
A hydraulic press has a ram of 15 cm diameter and plunger of 1.5 cm. It is required to lift a weight of 1 tonne. The force required on plunger is equal tc
A. 10 kg
B. 100 kg
C. 1000 kg
D. 1 kg
Question 196
Specific weight of water in S.I. units is equal to
A. 1000 N/m3
B. 10000 N/m3
C. 9.81 xlO3 N/m3
D. 9.81 xlO6 N/m3
Question 197
Newton’s law of viscosity relates
A. intensity of pressure and rate of angular deformation
B. shear stress and rate of angular deformation
C. shear stress, viscosity and temperature
D. viscosity and rate of angular deformation
Question 198
A pressure of 25 m of head of water is equal to
A. 25 kN/m2
B. 245 kN/m2
C. 2500 kN/m2
D. 2.5 kN/m2
Question 199
The pressure at a point in a fluid will not be same in all the directions when the fluid is
A. moving
B. viscous
C. inviscous and moving
D. viscous and moving.
Question 200
Choose the wrong statement
A. any weight, floating or immersed in a liquid, is acted upon by a buoyant force
B. Buoyant force is equal to the weight of the liquid displaced
C. The point through which buoyant force acts, is called the center of buoyancy
D. Center of buoyancy is located above the center of gravity of the displaced liquid v
Question 201
When an ideal fluid flows past a sphere
A. highest intensity of pressure occurs around the circumference at right angles to flow
B. lowest pressure intensity occurs at front stagnation point
C. lowest pressure intensity occurs at rear stagnation point
D. total drag is zero
Question 202
The value of friction factor ‘f’ for smooth pipes for Reynolds number 106 is approximately equal to
A. 0.1
B. 0.01
C. 0.001
D. 0.0001
Question 203
Coefficient of velocity of venturimeter
A. is independent of Reynolds number
B. decreases with higher Reynolds number
C. is equal to the coefficient of discharge of venturimeter
D. none of the above
Question 204
A model of a reservior is drained in 4 mts by opening the sluice gate. The model scale is 1: 225. How long should it take to empty the prototype ?
A. 4 minutes
B. 4 x (225)3/2 minutes
C. 4 (225)1/3 minutes
D. 4 x (225)1/2 minutes
Question 205
The equation of continuity holds good when the flow
A. is steady
B. is one dimensional
C. velocity is uniform at all the cross sec-tions
D. all of the above
Question 206
Pitot tube is used for measurement of
A. pressure
B. flow
C. velocity
D. dsscharge
Question 207
Select the correct statement.
A. The absolute roughness of a pipe de-creases with time
B. A pipe becomes smooth after using for long time
C. The friction factor decreases with time
D. The absolute roughness increases with time
Question 208
Select the incorrect statement.
A. The pressure intensity at vena contracta is atmospheric
B. Contraction is least at vena contracta
C. Stream lines are parallel throughout the jet at vena contracta
D. Coefficient of contraction is always less than one
Question 209
Kinematic viscosity is equal to
A. dynamic viscosity/density
B. dynamicviscosity x density
C. density/dynamic viscosity
D. 1/dynamicviscosity x density
Question 210
The losses are more in
A. laminar flow
B. transition flow
C. turbulent flow
D. critical flow
Question 211
Which of the following instrument can be used for measuring speed of a submarine moving in deep sea
A. Venturimeter
B. hot wire anemometer
C. rotameter
D. pitot tube
Question 212
For pipes, laminar flow occurs when Roynolds number is
A. less than 2000
B. between 2000 and 4000
C. more than 4000
D. less than 4000
Question 213
The depth of the center of pressure on a vertical rectangular gate 8 m wide and 6 m high, when the water surface coincides with the top of the gate, is
A. 2.4 m
B. 3.0 m
C. 4.0 m
D. 2.5 m
Question 214
The maximum thickness of boundary layer in a pipe of radius r is
A. 0
B. r/2
C. r
D. 2r
Question 215
The speed of a pressure wave through a pipe depends upon
A. the length of pipe
B. the viscosity of fluid
C. the bulk modulus for the fluid
D. the original head
Question 216
When the velocity distribution is uniform over the cross-section, the correction factor for momentum is
A. 0
B. 1
C. 4-3
D. 2
Question 217
Size of a venturimeter is specified by
A. pipe diameter
B. throat diameter
C. angle of diverging section
D. both pipe diameter as well as throat diameter
Question 218
Total pressure on a lmxlm gate immersed vertically at a depth of 2 m below the free water surface will be
A. 1000 kg
B. 4000 kg
C. 2000 kg
D. 8000 kg
Question 219
The value of mass density in kgsecVm4 for water at 0°C is
A. 1
B. 1000
C. 100
D. 101.9
Question 220
The bulk modulus of elasticity with increase in pressure
A. increases
B. decreases
C. remains constant
D. increases first upto certain limit and then decreases
Question 221
Choose the correct relationship
A. specific gravity = gravity x density
B. dynamicviscosity = kinematicviscosity x density
C. gravity = specific gravity x density
D. kinematicviscosity = dynamicviscosity x density
Question 222
If the velocity is zero over half of the cross-sectional area and is uniform over the remaining half, then the momentum correction factor is
A. 1
B. 4-3
C. 2
D. 4
Question 223
Units of surface tension are
A. energy/unit area
B. distance
C. both of the above
D. it has no units
Question 224
Dimensions of surface tension are
A. ML°T-2
B. ML°T
C. ML r-2
D. ML2T2
Question 225
Which of the following instruments is used to measure flow on the application of Bernoulli’s theorem
A. Venturimeter
B. Orifice plate
C. pitot tube
D. all of the above
Question 226
Which of the following is an incorrect statement ?
A. Coefficient of contraction of a venturimeter is unity
B. Flow nozzle is cheaper than venturimeter but has higher energy loss
C. Discharge is independent of orientation of venturimeter whether it is horizontal, vertical or inclined
D. None of the above statement is correct
Question 227
The speed of sound in a ideal gas varies directly as its
A. absolute temperature
B. temperature
C. density
D. modulus of elasticity
Question 228
Liquids transmit pressure equally in all the directions. This is according to
A. Boyle’s law
B. Archimedes principle
C. Pascal’s law
D. Newton’s formula
Question 229
The velocity of jet of water travelling out of opening in a tank filled with water is proportional to
A. head of water (h)
B. h2
C. V/T
D. h2
Question 230
The distance y from pipe boundary, at which the point velocity is equal to average velocity for turbulent flow, is (where R is radius of pipe)
A. 0.223 R
B. 0.423 R
C. 0.577 R
D. 0.707 R
Question 231
A piece of metal of specific gravity 7 floats in mercury of specific gravity 13.6. What fraction of its volume is under mercury ?
A. 0.5
B. 0.4
C. 0.515
D. 0.5
Question 232
Hot wire anemometer is used to measure
A. discharge
B. velocity of gas
C. pressure intensity of gas
D. pressure intensity of liquid
Question 233
The pitot tube is used to measure
A. velocity at stagnation point
B. stagnation pressure
C. static pressure
D. dynamic pressure
Question 234
Piezometer is used to measure
A. pressure in pipe, channels etc
B. atmospheric pressure
C. very low pressures
D. difference of pressure between two points
Question 235
Barometer is used to measure
A. pressure in pipes, channels etc
B. atmospheric pressure
C. very low pressure
D. difference of pressure between two points
Question 236
Differential monometer is used to measure
A. pressure in pipes, channels etc
B. atmospheric pressure
C. very low pressure
D. difference of pressure between two points
Question 237
Manometer is used to measure
A. pressure in pipes, channels etc
B. atmospheric pressure
C. very low pressure
D. difference of pressure between two points
Question 238
Coefficient of discharge for a totally submerged orifice as compared to that for an orifice discharging free is
A. slightly less
B. slightly more
C. nearly half
D. equal
Question 239
Dynamic viscosity of most of the liquids with rise in temperature
A. increases
B. decreases
C. remains unaffected
D. unpredictable
Question 240
Dynamic viscosity of most of the gases with rise in temperature
A. increases
B. decreases
C. remains unaffected
D. unpredictable
Question 241
The rise or depression of liquid in a tube due to surface tension wim increase in size of tube will
A. increase
B. remain unaffected
C. may increase or decrease depending on the characteristics of liquid
D. decrease
Question 242
A square surface 3 m x 3 m lies in a vertical line in water pipe its upper edge at vater surface. The hydrostatic force on square surface is
A. 9,000 kg
B. 13,500 kg
C. 18,000 kg
D. 27,000 kg
Question 243
The center of pressure of a surface subjected to fluid pressure is the point
A. on the surface at which resultant pres-sure acts
B. on the surface at which gravitational force acis
C. at which all hydraulic forces meet
D. similar to metacentre
Question 244
The normal stress in a fluid will be constant in all directions at a point only if
A. it is incompressible
B. it has uniform viscosity
C. it is frictionless
D. it is at rest
Question 245
A rectangular block 2 m long, 1 m wide and 1 m deep floats in water, the depth of immersion being 0.5 m. If water weighs 10 kN/m3, then the weight of the block is
A. 5kN
B. lOkN
C. 15 kN
D. 20 kN
Question 246
A floating body is said to be in a state of stable equilibrium
A. when its metacentric height is zero
B. when the metacentre is above the centre of gravity
C. when the metacentre is below the centre of gravity
D. only when its centre of gravity is below its centre of buoyancy
Question 247
A body floats in stable equilibrium
A. when its meatcentric height is zero
B. when the metancentre is above e.g.
C. when its e.g. is below it’s center of buoyancy
D. metacentre has nothing to do with position of e.g. for determining stability
Question 248
Metacentric height for small values of angle of heel is the distance between the
A. centre of gravity and centre of buoy-ancy
B. centre of gravity and metacentre
C. centre of buoyancy and metacentre
D. free surface and centre of buoyancy
Question 249
If no resistance is encountered by displacement, such a substance is known as
A. fluid
B. water
C. perfect solid
D. ideal fluid
Question 250
The flow in which the velocity vector is identical in magnitude and direction at every point, for any given instant, is known as
A. one dimensional flow
B. uniform f^w
C. steady flow
D. turbulent flow
Question 251
The flow in which the particles of a fluid attain such velocities that vary from point to point in magnitude and direction as well as from instant to instant, is known as
A. one dimensional flow
B. uniform flow
C. steady flow
D. turbulent flow
Question 252
The specific weight of water is 1000 kg/m”
A. at normal pressure of 760 mm
B. at 4°C temperature
C. at mean sea level
D. all the above
Question 253
Density of water is maximum at
A. 0°C
B. 0°K
C. 4°C
D. 100°C
Question 254
Euler’s dimensionless number relates the following
A. inertial force and gravity
B. viscous force and inertial force
C. viscous force and buoyancy force
D. pressure force and inertial force
Question 255
A valve is suddenly closed in a water main in wl.ich the velocity is 1 m/sec and velocity of pressure wave is 981 m/ sec. The inertia head at the valve will be
A. 1 m
B. 10m
C. 100m
D. none of the above
Question 256
The wake
A. always occurs before a separation point
B. always occurs after a separation point
C. is a region of high pressure intensity
D. none of the above
Question 257
In a forced vortex, the velocity of flow everywhere within the fluid is
A. maximum
B. minimum
C. zero
D. non-zero finite
Question 258
The units of kinematic viscosity are
A. metres² per sec
B. kg sec/meter
C. newton-sec per meter
D. newton-sec per meter
Question 259
The length of a pipe is 1 km and its diameter is 20 cm. If the diameter of an equivalent pipe is 40 cm, then its length is
A. 32 km
B. 20 km
C. 8 km
D. 4 km
Question 260
If the weight of a body immersed in a fluid exceeds the buoyant force, then the body will
A. rise until its weight equals the buoyant force
B. tend to move downward and it may finally sink
C. float
D. none of the above
Question 261
A metal with specific gravity of o floating in a fluid of same specific gravity a will
A. sink to bottom
B. float over fluid
C. partly immersed
D. be fully immersed with top surface at fluid surface
Question 262
The time oscillation of a floating body with increase in metacentric height will be
A. same
B. higher
C. lower
D. lower/higher depending on weight of body
Question 263
In series-pipe problems
A. the head loss is same through each pipe
B. the discharge is same through each pipe
C. a trial solution is not necessary
D. the discharge through each pipe is added to obtain total discharge
Question 264
An ideal flow of any fluid must fulfill the following
A. Newton’s law of motion
B. Newton’s law of viscosity
C. Pascal’ law
D. Continuity equation
Question 265
The motion of air mass in a tornado is a
A. free vortex motion
B. forced vortex motion
C. free vortex at center and forced vortex outside
D. forced vortex at center and free vortex outside
Question 266
A fluid of kinematic viscosity 0.4 cm²/sec flows through a 8 cm diameter pipe. The maximum velocity for laminar flow will be
A. less than 1 m/sec
B. 1 m/sec
C. 1.5 m/sec
D. 2 m/sec
Question 267
Stream lines and path lines always coincide in case of
A. steady flow
B. laminar flow
C. uniform flow
D. turbulent flow
Question 268
Which of the following velocity potentials satisfies continuity equation ?
A. x2y
B. x2-y2
C. cosx
D. x2 + y2
Question 269
The capillary rise at 20°C in a clean glass tube of 1 mm bore containing water is ap-proximately
A. 5 mm
B. 10 mm
C. 20 mm
D. 30 mm
Question 270
The continuity equation is connected with
A. viscous/unviscous fluids
B. compressibility of fluids
C. conservation of mass
D. steady/unsteady flow
Question 271
Kinematic viscosity is dependent upon
A. pressure
B. distance
C. flow
D. density