Fluid Mechanics MCQ Civil Engineering Pdf
Specific weight of sea water is more that of pure water because it contains
A. dissolved air
B. dissolved salt
C. suspended matter
D. all of the above
Fluid is a substance which offers no resistance to change of
A. pressure
B. flow
C. shape
D. volume
The resultant of all normal pressures acts
A. at e.g. of body
B. at center of pressure
C. vertically upwards
D. at metacentre
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
The units of viscosity are
A. metre /sec
B. kg sec/metre
C. newton-sec/metre2
D. newton-sec/metre2
To avoid vaporisation in the pipe line, the pipe line over the ridge is laid such that it is not more than
A. 2.4 m above the hydraulic gradient
B. 6.4 m above the hydraulic gradient
C. 10.0 m above the hydraulic gradient
D. 5.0 above the hydraulic gradient
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
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
Coefficient of contraction for an external cylindrical mouthpiece is
A. 1.00*
B. 0.855
C. 0.7H
D. 0.611
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
Fluid Mechanics MCQ Civil Engineering Pdf
Alcohol is used in manometers because
A. it has low vapour pressure
B. it is clearly visible
C. it has low surface tension
D. it can provide longer column due to low density
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.
The surface tension of mercury at normal temperature compared to that of water is
A. more
B. less
C. same
D. more or less depending on size of glass tube
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
The property 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
The density of water is 1000 kg/m3 at
A. 0°C
B. 0°K
C. 4°C
D. 20°C
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
Steady flow occurs when
A. the direction and magnitude of the velocity at all points are identical
B. the velocity of successive fluid particles, 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
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
An ideal fluid is
A. one which obeys Newton’s law of viscosity
B. frictionless and incompressible.
C. very viscous
D. frictionless and compressible
Fluid Mechanics MCQ Civil Engineering Pdf
If 850 kg liquid occupies volume of one cubic meter, men 0.85 represents its
A. specific weight
B. specific mass
C. specific gravity.
D. specific density
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.
The discharge through a V- notch varies as
A. H1/2
B. H3’2
C. H5/2
D. H5’4 where H is head.
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
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
Surface energy per unit area of a surface is numerically equal to
A. atmospheric pressure
B. surface tension
C. force of adhesion
D. force of cohesion
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
A large Roynold number is indication of
A. smooth and streamline flow
B. laminar flow
C. turbulent flow
D. highly turbulent flow.
Free surface of a liquid tends to contract to the smallest possible area due to force of
A. surface tension
B. viscosity
C. friction
D. cohesion
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
Fluid Mechanics MCQ Civil Engineering Pdf
In a Sutro weir, the discharge is proportional to (where H is head)
A. H1/2
B. H3/2
C. H5/2
D. H
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
Mercury is often used in barometer because
A. it is the best liquid
B. the height of barometer will be less
C. its vapour pressure is so low that it may be neglected
D. both (B) and (C)
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
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.
The total pressure force on a plane area is equal to the area multiplied by the intensity of pressure at the centroid, if
A. the area is horizontal
B. the area is vertical
C. the area is inclined
D. all of the above
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
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
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
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
fluid mechanics questions and answers pdf
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
Any between two stream lines represents
A. velocity
B. discharge
C. head
D. pressure
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
Thee horizontal component of buoyant force is
A. negligible
B. same as buoyant force
C. zero
D. none of the above
The unit of kinematic viscosity is
A. gm/cm-sec²
B. dyne-sec/cm²
C. gm/cm²-sec
D. cm²/sec
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. Centroid of the displaced volume of fluid
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
An open vessel of water is accelerated up an inclined plane. The free water surface will
A. be horizontal
B. make an angle in direction of inclination of inclined plane
C. make an angle in opposite direction to inclination of inclined plane
D. any one of above is possible
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
Surface tension has the units of
A. newtons/m
B. newtons/m
C. new tons/m
D. newtons
fluid mechanics mcq pdf civil engineering
According to the principle of buoyancy a body totally or partially immersed in a fluid will be lifted up by a force equal to
A. the weight of the body
B. more than the weight of the body
C. less than the weight of the body
D. weight of the fluid displaced by the body
Normal depth in open channel flow is the depth of flow corresponding to
A. steady flow
B. unsteady flow
C. laminar flow
D. uniform flow
Pressure of the order of 10''' torr can be measured by
A. Bourdon tube
B. Pirani Gauge
C. micro-manometer
D. ionisation gauge
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
A bucket of water is hanging from a spring balance. An iron piece is suspended into water without touching sides of bucket from another support. The spring balance reading will
A. increase
B. decrease
C. remain same
D. increase/decrease depending on depth of immersion
A perfect gas
A. has constant viscosity
B. is incompressible
C. is of theoretical interest
D. none of the above.
The normal stress is same in all directions at a point in a fluid
A. only when the fluid is frictionless
B. only when the fluid is incompressible and has zero viscosity
C. when there is no motion of one fluid layer relative to an adjacent layer
D. irrespective of the motion of one fluid layer relative to an adjacent layer
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
In a two dimensional incompressible steady flow around an air foil, the stream lines are 2 cm apart at a great distance from the air foil, where the velocity is 30 m/sec. The velocity near the air foil, 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.
The region between the separation streamline and the boundary surface of the solid body is known as
A. wake
B. drag
C. lift
D. boundary layer
Fluid Mechanics MCQ
Which of the following is demensionless
A. specific weight
B. specific volume
C. specific speed
D. specific gravity
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
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
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
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
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
The theoretical value of coefficient of contraction of a sharp edged orifice is
A. 0.611
B. 0.85
C. 0.98
D. 1.00
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
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
A vertical rectangular plane surface is submerged in water such that its top and bottom surfaces are 1.5 m and 6.0 m respectively 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
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