Hydraulics And Fluid Mechanics Mcqs – (Civil Engineering) MCQs Latest For FPSC, PPSC, NTS, KPPSC, SPSC & Other Tests
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Hot wire anemometer is used to measure_______________?
A. pressure intensity of gas
B. velocity of gas
C. discharge
D. pressure intensity of liquid
Density of water is maximum at ___________________?
A. 0°K
B. 0°C
C. 4°C
D. 100°C
E. 20°C.
Property of a fluid by which its own molecules are attracted is called ________________?
A. viscosity
B. cohesion
C. adhesion
D. compressibility
E. surface tension
The property of a fluid which enables it to resist tensile stress is known as________________?
A. surface tension
B. compressibility
C. cohesion
D. adhesion
E. viscosity.
The specific weight of water is 1000 kg/m” _______________?
A. at norma] pressure of 760 mm
B. at mean sea level
C. at 4°C temperature
D. all the above
E. none of the above.
When the flow parameters at any given instant remain same at every point, then flow is said to be____________________?
A. steady state
B. quasi static
C. laminar
D. uniform
E. static.
The normal stress in a fluid will be constant in all directions at a point only if_________________?
A. it has zero viscosity
B. it has uniform viscosity
C. it is incompressible
D. it is frictionless
E. it is at rest.
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. 10.2/m sec
C. 9.81 m/sec2
D. 9.75 m/sec2
E. 9 m/sec .
The surface tension of mercury at normal temperature compared to that of water is____________________?
A. more
B. same
C. less
D. more or less depending on size of glass tube
E. none of the above.
For very great pressures, viscosity of moss gases and liquids __________________?
A. increases
B. remains same
C. decreases
D. shows erratic behaviour
E. none of the above.
Viscosity of water in comparison to mercury is ______________________?
A. higher
B. same
C. lower
D. higher/lower depending on temperature
E. unpredictable.
The bulk modulus of elasticity __________________?
A. is large when fluid is more compressible
B. increases with pressure
C. has the dimensions of 1/pressure
D. is independent of pressure and viscosity
E. is directly proportional to flow.
The value of the coefficient of compressibility for water at ordinary pressure and temperature in kg/cm is equal to _________________?
A. 2100
B. 1000
C. 2700
D. 10,000
E. 21,000.
Surface tension _____________________?
A. acts in the plane of the interface normal to any line in the surface
B. is a function of the curvature of the interface
C. is also known as capillarity
D. decreases with fall in temperature
E. has no units
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. 40 x 105 kg/cm2
B. 4000 kg/cm2
C. 400 kg/cm2
D. 40 x 106 kg/cm2
E. none of the above
Units of surface tension are_________________?
A. distance
B. energy/unit area
C. both of the above
D. it has no units
E. none of the above
Choose the correct relationship_________________?
A. gravity = specific gravity x density
B. dynamicviscosity = kinematicviscosity x density
C. specific gravity = gravity x density
D. kinematicviscosity = dynamicviscosity x density
E. hydrostaticforce = surface tension x gravity.
For manometer, a better liquid combination is one having______________?
A. higher surface tension
B. high density and viscosity
C. surface tension is no criterion
D. lower surface tension
E. low density and viscosity
The property of fluid by virtue of which it offers resistance to shear is called____________________?
A. surface tension
B. cohesion
C. adhesion
D. viscosity
E. all of the above
The density of water is 1000 kg/m3 at __________________?
A. 0°K
B. 0°C
C. 4°C D. 20°C
E. all temperature
The ratio of absolute viscosity to mass density is known as____________________?
A. viscosity index
B. specific viscosity
C. kinematic viscosity
D. coefficient of viscosity
E. coefficient of compressibility
Which of the following is the unit of kinematic viscosity _________________?
A. poise
B. pascal
C. stoke
D. faraday
E. none of the above
Alcohol is used in manometers because_____________________?
A. it is clearly visible
B. it has low vapour pressure
C. it has low surface tension
D. it can provide longer column due to low density
E. is provides suitable meniscus
Specific weight of sea water is more that of pure water because it contains ________________?
A. dissolved salt
B. dissolved air
C. suspended matter
D. all of the above
E. heavy water
Free surface of a liquid tends to contract to the smallest possible area due to force of _________________?
A. surface tension
B. friction
C. viscosity
D. cohesion
E. adhesion
Falling drops of water become spheres due to the property of ________________?
A. cohesion
B. adhesion
C. surface tension
D. viscosity
E. compressibility
If cohesion between molecules of a fluid is greater than adhesion between fluid and glass, then the free level of fluid in a dipped glass tube will be_________________?
A. the same as the surface of liquid
B. higher than the surface of liquid
C. lower than the surface of liquid
D. unpredictable
E. none of the above
The total pressure on the surface of a vertical sluice gate 2 m x 1 m with its top 2 m surface being 0.5 m below the water level will be____________________?
A. 1000 kg
B. 500 kg
C. 1500 kg
D. 2000 kg
E. 4000 kg.
The resultant upward pressure of the fluid on an immersed body is called_________________?
A. center of pressure
B. buoyancy
C. upthrust
D. all the above are correct
E. none of above is correc
Hot wire anemometer is used to measure_______________?
A. pressure intensity of gas
B. velocity of gas
C. discharge
D. pressure intensity of liquid
Density of water is maximum at ___________________?
A. 0°K
B. 0°C
C. 4°C
D. 100°C
E. 20°C.
Property of a fluid by which its own molecules are attracted is called ________________?
A. viscosity
B. cohesion
C. adhesion
D. compressibility
E. surface tension
The property of a fluid which enables it to resist tensile stress is known as________________?
A. surface tension
B. compressibility
C. cohesion
D. adhesion
E. viscosity.
The specific weight of water is 1000 kg/m” _______________?
A. at norma] pressure of 760 mm
B. at mean sea level
C. at 4°C temperature
D. all the above
E. none of the above.
When the flow parameters at any given instant remain same at every point, then flow is said to be____________________?
A. steady state
B. quasi static
C. laminar
D. uniform
E. static.
The normal stress in a fluid will be constant in all directions at a point only if_________________?
A. it has zero viscosity
B. it has uniform viscosity
C. it is incompressible
D. it is frictionless
E. it is at rest.
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. 10.2/m sec
C. 9.81 m/sec2
D. 9.75 m/sec2
E. 9 m/sec .
The surface tension of mercury at normal temperature compared to that of water is____________________?
A. more
B. same
C. less
D. more or less depending on size of glass tube
E. none of the above.
For very great pressures, viscosity of moss gases and liquids __________________?
A. increases
B. remains same
C. decreases
D. shows erratic behaviour
E. none of the above.
Viscosity of water in comparison to mercury is ______________________?
A. higher
B. same
C. lower
D. higher/lower depending on temperature
E. unpredictable.
The bulk modulus of elasticity __________________?
A. is large when fluid is more compressible
B. increases with pressure
C. has the dimensions of 1/pressure
D. is independent of pressure and viscosity
E. is directly proportional to flow.
The value of the coefficient of compressibility for water at ordinary pressure and temperature in kg/cm is equal to _________________?
A. 2100
B. 1000
C. 2700
D. 10,000
E. 21,000.
Surface tension _____________________?
A. acts in the plane of the interface normal to any line in the surface
B. is a function of the curvature of the interface
C. is also known as capillarity
D. decreases with fall in temperature
E. has no units
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. 40 x 105 kg/cm2
B. 4000 kg/cm2
C. 400 kg/cm2
D. 40 x 106 kg/cm2
E. none of the above
Units of surface tension are_________________?
A. distance
B. energy/unit area
C. both of the above
D. it has no units
E. none of the above
Choose the correct relationship_________________?
A. gravity = specific gravity x density
B. dynamicviscosity = kinematicviscosity x density
C. specific gravity = gravity x density
D. kinematicviscosity = dynamicviscosity x density
E. hydrostaticforce = surface tension x gravity.
For manometer, a better liquid combination is one having______________?
A. higher surface tension
B. high density and viscosity
C. surface tension is no criterion
D. lower surface tension
E. low density and viscosity
The property of fluid by virtue of which it offers resistance to shear is called____________________?
A. surface tension
B. cohesion
C. adhesion
D. viscosity
E. all of the above
The density of water is 1000 kg/m3 at __________________?
A. 0°K
B. 0°C
C. 4°C D. 20°C
E. all temperature
The ratio of absolute viscosity to mass density is known as____________________?
A. viscosity index
B. specific viscosity
C. kinematic viscosity
D. coefficient of viscosity
E. coefficient of compressibility
Which of the following is the unit of kinematic viscosity _________________?
A. poise
B. pascal
C. stoke
D. faraday
E. none of the above
Alcohol is used in manometers because_____________________?
A. it is clearly visible
B. it has low vapour pressure
C. it has low surface tension
D. it can provide longer column due to low density
E. is provides suitable meniscus
Specific weight of sea water is more that of pure water because it contains ________________?
A. dissolved salt
B. dissolved air
C. suspended matter
D. all of the above
E. heavy water
Free surface of a liquid tends to contract to the smallest possible area due to force of _________________?
A. surface tension
B. friction
C. viscosity
D. cohesion
E. adhesion
Falling drops of water become spheres due to the property of ________________?
A. cohesion
B. adhesion
C. surface tension
D. viscosity
E. compressibility
If cohesion between molecules of a fluid is greater than adhesion between fluid and glass, then the free level of fluid in a dipped glass tube will be_________________?
A. the same as the surface of liquid
B. higher than the surface of liquid
C. lower than the surface of liquid
D. unpredictable
E. none of the above
The total pressure on the surface of a vertical sluice gate 2 m x 1 m with its top 2 m surface being 0.5 m below the water level will be____________________?
A. 1000 kg
B. 500 kg
C. 1500 kg
D. 2000 kg
E. 4000 kg.
The resultant upward pressure of the fluid on an immersed body is called_________________?
A. center of pressure
B. buoyancy
C. upthrust
D. all the above are correct
E. none of above is correct
The buoyancy depends on__________________?
A. mass of liquid displaced
B. pressure of the liquid displaced
C. viscosity of the liquid
D. depth of immersion
E. none of the above.
A piece of metal of specific gravity 13.6 is placed in mercury of specific gravity 13.6, what fraction of it volume is under mercury ?
A. the metal piece will be immersed in mercury by half
B. the metal piece will simply float over the mercury
C. whole of the metal piece will be immersed with its top surface just at mercury level
D. metal piece will sink to the bottom
E. none of the above
Fluid is a substance which offers no resistance to change of_________________?
A. flow
B. pressure
C. shape
D. volume
E. temperature
An ideal flow of any fluid must fulfill the following______________?
A. Newton’s law of viscosity
B. Newton’s law of motion
C. Pascal’ law
D. Continuity equation
E. Boundary layer theory
The volumetric change of the fluid caused by a resistance is known as_________________?
A. volumetric index
B. volumetric strain
C. compressibility
D. adhesion
E. cohesion
A fluid is said to be ideal, if it is________________?
A. inviscous
B. incompressible
C. viscous and incompressible
D. inviscous and compressible
E. inviscous and incompressible
Fluid is a substance that_______________?
A. always expands until it fills any container
B. cannot be subjected to shear forces
C. has the same shear stress.at a point regardless of its motion
D. cannot remain at rest under action of any shear force
E. flows
Practical fluids____________________?
A. possess surface tension
B. are viscous
C. are compressible
D. possess all the above properties
E. possess none of the above properties
If no resistance is encountered by displacement, such a substance is known as___________________?
A. water
B. fluid
C. gas
D. perfect solid
E. ideal fluid
Liquids________________?
A. occupy definite volume
B. cannot be compressed
C. are not affected by change in pressure and temperature
D. GO are not viscous
E. none of the above
The value of mass density in kgsecVm4 for water at 0°C is_______________?
A. 1000
B. 1
C. 100
D. 101.9
E. 91
Mercury does not wet glass. This is due to property of liquid known as_________________?
A. cohesion
B. adhesion
C. surface tension
D. viscosity
E. compressibility
Property of a fluid by which molecules of different kinds of fluids are attracted to each other is called________________?
A. adhesion
B. viscosity
C. cohesion
D. compressibility
E. surface tension
Specific weight of water in S.I. units is equal to_________________?
A. 10000 N/m3
B. 1000 N/m3
C. 9.81 xlO3 N/m3
D. 9.81 xlO6N/m3
E. 9.81 N/m3
Which of the following is dimensionless ________________?
A. specific volume
B. specific weight
C. specific speed
D. specific gravity
E. specific viscosity
The pressure at a point in a fluid will not be same in all the directions when the fluid is________________?
A. viscous
B. moving
C. viscous and static
D. inviscous and moving
E. viscous and moving
The tendency of a liquid surface to contract is due to the following property_________________?
A. adhesion
B. cohesion
C. viscosity
D. surface tension
E. elasticity
A fluid in equilibrium can’t sustain_________________?
A. compressive stress
B. tensile stress
C. shear stress
D. bending stress
E. all of the above
The bulk modulus of elasticity with increase in pressure___________________?
A. increases
B. remains constant
C. decreases
D. increases first upto certain limit and then decreases
E. unpredictable
A balloon lifting in air follows the following principle_________________?
A. Archimedes principle
B. law of gravitation
C. principle of buoyancy
D. all of the above
E. continuity equation
In a static fluid__________________?
A. resistance to shear stress is small
B. linear deformation is small
C. fluid pressure is zero
D. only normal stresses can exist
E. viscosity is nil
A perfect gas_________________?
A. has zero viscosity
B. has constant viscosity
C. is incompressible
D. is of theoretical interest
E. none of the above
The increase of temperature results in_________________?
A. increase in viscosity of liquid
B. increase in viscosity of gas
C. decrease in viscosity of gas
D. decrease in viscosity of liquid
E. A. and D. above
Surface tension has the units of____________________?
A. newtons/m
B. newtons/m
C. new tons/m
D. newtons
E. newton m
The stress-strain relation of the newtoneon fluid is________________?
A. linear
B. hyperbolic
C. parabolic
D. inverse type
E. none of the above
The units of viscosity are__________________?
A. newton-sec per metre2
B. kg sec/metre
C. metres2 per sec
D. newton-sec per metre
E. none of the above
Kinematic viscosity is dependent upon________________?
A. distance
B. pressure
C. level
D. flow
E. density
Which of the following meters is not associated with viscosity__________________?
A. Say bolt
B. Red wood
C. Engler
D. Orsat
E. none of the above
Dimensions of surface tension are_________________?
A. MlL°T2
B. MlL r2
C. MlL°Tx
D. MlL2T2
E. MlL°t
If mercury in a barometer is replaced by water, the height of 3.75 cm of mercury will be following cm of water___________________?
A. 51 cm
B. 52 cm
C. 50 cm
D. 52.2 cm
E. 51.7 cm
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. w/h
B. wh
C. h
D. h/w
E. h/wh
The units of kinematic viscosity are_______________?
A. metres2 per sec
B. newton-sec per meter
C. kg sec/meter
D. newton-sec per meter
E. none of the above
4-61. Kinematic viscosity is equal to________________?
A. dynamic viscosity/density
B. density/dynamic viscosity
C. dynamicviscosity x density
D. 1/dynamicviscosity x density
E. same as dynamic viscosity
A one dimensional flow is one which___________________?
A. is steady uniform flow
B. is uniform flow
C. takes place in straight lines
D. involves zero transverse component of flow
E. takes place in one dimension
A pressure of 25 m of head of water is equal to________________?
A. 2500 kN/m2
B. 245 kN/m2
C. 25 kN/m2
D. 2.5kN/m2
E. 12.5 kN/m2
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. decrease
B. increase
C. remain same
D. increase/decrease depending on depth of immersion
E. unpredictable
A liquid would wet the solid, if adhesion forces as compared to cohesion forces are_________________?
A. equal
B. more
C. less
D. less at low temperature and more at high temperature
E. there is no such criterion
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 buoyancy
B. center of pressure
C. meta center
D. center of gravity
E. none of the above
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. Equilibrium of a floating body
B. Buoyancy
C. Archimedes’ principle
D. Bernoulli’s theorem
E. Metacentric principle
The conditions for the stable equilibrium of a floating body are_______________?
A. a righting couple should be formed
B. the center of buoyancy and the center of gravity must lie on the same vertical line
C. the meta-center should lie above the center of gravity
D. all the above are correct
E. none of the above is correct