Hydraulics And Fluid Mechanics Mcqs – (Civil Engineering) MCQs Latest For FPSC, PPSC, NTS, KPPSC, SPSC & Other Tests
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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
Poise is the unit of________________?
A. capillarity
B. surface tension
C. viscosity
D. shear stress in fluids
E. buoyancy
Metacentric height is given as the distance between_______________?
A. the center of gravity of the body andthe meta center
B. center of buoyancy and metacentre
C. the center of gravity of the body and the center of pressure
D. the center of gravity of the body and the center of buoyancy
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
If 850 kg liquid occupies volume of one cubic meter, men 0.85 represents its_______________?
A. specific mass
B. specific weight
C. specific gravity
D. specific density
E. none of the above
The center of gravity of the volume of the liquid displaced by an immersed body is called________________?
A. center of pressure
B. meta-center
C. center of buoyancy
D. center of gravity
E. none of the above
The angle of contact in case of a liquid depends upon____________________?
A. the nature of the liquid and the solid
B. the material which exists above the free surface of the liquid
C. both of the above
D. any one of the above
E. none of the above
Rain drops are spherical because of____________________?
A. air resistance
B. viscosity
C. surface tension forces
D. atmospheric pressure
E. none of the above
If the surface of liquid is convex, men_________________?
A. cohesion pressure is decreased
B. cohesion pressure is negligible
C. cohesion pressure is increased
D. there is no cohesion pressure
E. none of the above
To avoid an interruption in the flow of a syphon, an air vessel is provided______________?
A. at the outlet
B. at the inlet
C. at the summit
D. ay nay point between inlet and outlet
E. none of the above
The peoperty by virtue of which a liquid opposes relative motion between its different layers is called_________________?
A. osmosis
B. co-efficient of viscosity
C. viscosity
D. surface tension
E. cohesion
The units of dynamic or absolute viscosity are_______________?
A. kg sec/meter
B. metres2 per sec
C. newton-sec per meter
D. newton-sec2 per meter
E. none of the above
The rise or depression of liquid in a tube due to surface tension wim increase in size of tube will_______________?
A. unpredictable
B. remain unaffected
C. may increase or decrease depending on the characteristics of liquid
D. decrease
E. increase
Capillary action is due to the__________________?
A. cohesion of the liquid
B. surface tension
C. adhesion of the liquid molecules and the molecules on the surface of a solid
D. all of the above
E. none of the above
Liquids transmit pressure equally in all the directions. This is according to_________________?
A. Archimedes principle
B. Boyle’s law
C. Pascal’s law
D. Newton’s formula
E. Chezy’s equation
The continuity equation is connected with_______________?
A. compressibility of fluids
B. viscous/unviscous fluids
C. conservation of mass
D. steady/unsteady flow
E. open channel/pipe flow
The process of diffusion of one liquid into the other through a semi-permeable membrane is called _______________?
A. surface tension
B. osmosis
C. viscosity
D. cohesion
E. diffusivity
The vapour pressure over the concave surface is__________________?
A. less man the vapour pressure over the plane surface
B. greater than the vapour pressure over the plane surface
C. equal to the vapour pressure over the plane surface
D. zero
E. none of the above
The difference of pressure between the inside and outside of a liquid drop is_____________?
A.p = T/r
B.p = Txr
C. p = T/2r
D.p = 2T/r
E. none of the above
The capillary rise at 20°C in a clean glass tube of 1 mm bore containing water is ap-proximately_______________?
A. 5 mm
B. 1 mm
C. 10 mm
D. 20 mm
E. 30 mm
Free surface of a liquid behaves like a sheet and tends to contract to smallest possible area due to the______________?
A. force of friction
B. force of cohesion
C. force of adhesion
D. force of diffusion
E. none of die above
Surface energy per unit area of a surface is numerically equal to ___________________?
A. force of adhesion
B. surface tension
C. atmospheric pressure
D. force of cohesion
E. viscosity
The vapour pressure over the concave surface is________________?
A. less man the vapour pressure over the plane surface
B. greater than the vapour pressure over the plane surface
C. equal to the vapour pressure over the plane surface
D. zero
E. none of the above
To avoid vaporisation in the pipe line, the pipe line over the ridge is laid such that it is not more than_______________?
A. 5.0 above the hydraulic gradient
B. 6.4 m above the hydraulic gradient
C. 10.0 m above the hydraulic gradient
D. 2.4 m above the hydraulic gradient
E. none of the above
The difference of pressure between the inside and outside of a liquid drop is________________?
A.p = T/r
B. p = Txr
C. p = T/2r
D. p = 2T/r
E. none of the above
The capillary rise at 20°C in a clean glass tube of 1 mm bore containing water is ap-proximately____________________?
A. 5 mm
B. 1 mm
C. 10 mm
D. 20 mm
E. 30 mm
Surface energy per unit area of a surface is numerically equal to___________________?
A. force of adhesion
B. surface tension
C. atmospheric pressure
D. force of cohesion
E. viscosity
Free surface of a liquid behaves like a sheet and tends to contract to smallest possible area due to the_______________?
A. force of friction
B. force of cohesion
C. force of adhesion
D. force of diffusion
E. none of die above
The atmospheric pressure with rise in altitude decreases____________________?
A. unpredictable
B. first slowly and then steeply
C. first steeply and then gradually
D. linearly
E. none of the above
An odd shaped body weighing 7.5 kg and occupying 0.01 m3 volume will be completely submerged in a fluid having specific gravity of_________________?
A. 1.2
B. 1
C. 0.8
D. 0.75
E. 1.25
Newton’s law of viscosity is a relationship between________________?
A. shear stress anctthejiate of angular distortion
B. shear stress, velocity and viscosity
C. shear stress and viscosity
D. pressure, velocity and viscosity
E. shear stress, pressure and rate of angular distortion
Pressure of the order of 10″‘ torr can be measured by_______________ ?
A. Pirani Gauge
B. Bourdon tube
C. micro-manometer
D. ionisastion gauge
E. McLeod gauge
Operation of McLeod gauge used for low pressure measurement is based on the principle of_____________________?
A. Charle’s law
B. Boyle’s law
C. gas law
D. Pascal’s law
E. McLeod’s law
In an isothermal atmosphere, the pressure__________________?
A. increases exponentially with elevation
B. remains constant
C. varies in the same way as the density
D. decreases linearly with elevation
E. unpredictable
Barometer is used to measure__________________?
A. very low pressure
B. atmospheric pressure
C. pressure in pipes, channels etc.
D. difference of pressure between two points
E. rain level
Which of the following instrument can be used for measuring speed of an aeroplane ________________?
A. Orifice plate
B. Venturimeter
C. hot wire anemometer
D. rotameter
E. pitot tube
Mercury is often used in barometer because _________________?
A. it is the best liquid
B. its vapour pressure is so low that it may be neglected
C. the height of barometer will be less
D. both B. and C.
E. it moves easily
Which of the following instrument can be used for measuring speed of a submarine moving in deep sea_________________?
A. Orifice plate
B. Venturimeter
C. hot wire anemometer
D. rotameter
E. pitot tube
Dynamic viscosity of most of the liquids with rise in temperature____________________?
A. unpredictable
B. decreases
A. remains unaffected
D. increases
E. none of the above
A metal with specific gravity of o floating in a fluid of same specific gravity a will___________________?
A. float over fluid
B. sink to bottom
C. partly immersed
D. be fully immersed with top surface at fluid surface
E. none of the above
The speed of sound in a ideal gas varies directly as its ______________?
A. temperature
B. pressure
C. density
D. modulus of elasticity
E. absolute temperature
Which of the following instruments is used to measure flow on the application of Bernoulli’s theorem __________________?
A. Orifice plate
B. Venturimeter
C. nozzle
D. pitot tube
E. all of the above
Dynamic viscosity of most of the gases with rise in temperature___________________?
A. increases
B. unpredictable
C. remains unaffected
D. decreases
E. none of the above
Euler’s dimensionless number relates the following_______________?
A. viscous force and inertial force
B. inertial force and gravity
C. viscous force and buoyancy force
D. pressure force and inertial force
E. pressure force and viscous force
Which of the following manometer has highest sensitivity __________________?
A. inclined U-tube
B. U-tube with water
C. U-tube with mercury
D. micro-manometer with water
E. displacement type
Working principle of dead weight pressure gauge tester is based on __________________?
A. Pascal’s law
B. Newton’s law of viscosity
C. Dalton’s law of partial pressure
D. Avogadro’s hypothesis
E. Second law of thermodynamic
In order to increase sensitivity of U-tube manometer, one leg is usually inclined by angle 9. Sensitivity of inclined tube to sensitivity of U-tube is equal to_________________?
A. casS
B. sin 9
C. sin 9
D. cos 9
E. tan 9
The resultant of all normal pressures acts_________________?
A. at center of pressure
B. at e.g. of body
C. vertically upwards
D. at metacentre
E. vertically downwards
Metacentric height is the distance between the metacentre and___________________?
A. center of pressure
B. water surface
C. center of gravity
D. center of buoyancy
E. none of the above
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. similar to metacentre
D. at which all hydraulic forces meet
E. where pressure equivalent to hydraulic thrust will act
Centre of pressure compared to e.g. is______________?
A. at same point
B. below it
C. above it
D. above or below depending on area of body
E. none of the above
The resultant upward pressure of the fluid on an immersed body due to its tendency to uplift the sub-merged body is called___________________?
A. reaction
B. upthrust
C. buoyancy
D. metacentre
E. center of pressure
A piece weighing 3 kg in air was found to weigh 2.5 kg when submerged in water. Its specific gravity is__________________?
A. 5
B. 1
C. 7
D. 6
Center of buoyancy is the___________________?
A. centroid of the displaced volume of fluid
B. e.g. of floating ‘body
C. center of pressure of displaced volume
D. does not exist
E. none of the above
The horizontal component of buoyant force is__________________?
A. same as buoyant force
B. negligible
C. zero
D. non of these
A body floats in stable equilibrium________________?
A. when its e.g. is below it’s center of buoyancy
B. when the metancentre is above e.g
C. when its meatcentric height is zero
D. metacentre has nothing to do with position of e.g. for determining stability
E. none of the above
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 vertical
B. the area is horizontal
C. the area is inclined
D. all of the above
E. none of the above
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. 18,000 kg
B. 13,500 kg
C. 9,000 kg
D. 27,000 kg
E. 30,000 kg
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. 3 meters of water column
B. 2 meters of water column
C. 5 meters of water column
D. 6 meters of water Column
E. 7 meters of water column
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 vertical component of the hydrostatic force on any surface is equal to the weight of the volume of the liquid above the area
C. The horizontal component acts through the center of pressure for the vertical projection
D. he vertical component passes through the center of pressure of the volume
E. Center of pressure acts at a greater depth than center of gravity
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. 4.0 m
B. 3.0 m
C. 2.4 m
D. 2.5 m
E. 5.0 m
Metacentre is the point of intersection of _________________________?
A. mid point between e.g. and center of buoyancy
B. buoyant force and the center line of body
C. vertical upward force through e.g. of body and center line of body
D. all of the above
E. none of the above
For a body floating in a liquid the normal pressure exerted by the liquid acts at _________________?
A. e.g. of the body
B. bottom surface of the body
C. metacentre
D. all points on the surface of the body
E. all of the above
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. more than the weight of the body
B. the weight of the body
C. less than the weight of the body
D. weight of the fluid displaced by the body
E. weight of body plus the weight of the fluid displaced by the body
Buoyant force is___________________?
A. equal to the volume of liquid displaced
B. resultant force acting on a floating body
C. force necessary to keep a body in equilibrium
D. the resultant force on a body due to the fluid surrounding it
E. none of the above
Ratio of inertia force to surface tension is known as ________________________?
A. Froude number
B. Mach number
C. Reynold’s number
D. Weber’s number
E. none of the above
When a body floating in a liquid, is displaced slightly, it oscillates about ___________________?
A. e.g. of body
B. center of buoyancy
C. center of pressure
D. metacentre
E. liquid surface
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. 900 minutes
C. 4 x (225)3/2 minutes
D. 4 (225)1/3 minutes
E. 4 x V225 minutes
For a floating body to be in stable equilibrium, its metacentre should be_________________ ?
A. below the center of buoyancy
B. below the center of gravity
C. above the center of buoyancy
D. between e.g. and center of pressure
E. above the center of gravity
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 : 25
C. 1 : 2.5
D. 1:V5″
E. 1 : 53/2
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. 25 m/sec
B. 10 m/sec
C. 2 m/sec
D. 50 m/sec
E. 250 m/sec
Ratio of inertia force to elastic force is known as _____________________?
A. Mach number
B. Reynold’s number
C. Froude number
D. Weber’s number
E. none of the above
For a floating body to be in equilibrium __________________?
A. a righting couple should be formed
B. center of buoyancy and e.g. must lie on same vertical plane
C. meta center should be above e.g.
D. all of the above
E. none of the above
An open vessel of water is accelerated up an inclined plane. The free water surface will___________________?
A. any one of above is possible
B. make an angle in direction of inclination of inclined plane
C. make an angle in opposite direction to inclination of inclined plane
D. be horizontal
E. none of the above
Center of pressure on an inclined plane is______________________?
A. above the centroid
B. at the centroid
C. below the centroid
D. at metacentre
E. at center of pressure
The two important forces for a floating body are___________________?
A. buoyancy, gravity
B. buoyancy, inertial
C. buoyancy, pressure
D. inertial, gravity
E. gravity, pressure
Resultant pressure of the liquid in the case of an immersed body acts through _________________?
A. metacentre
B. center of pressure
C. center of gravity
D. center of buoyancy
E. in between e.g. and center of pressure
Differential monometer is used to measure _______________________?
A. pressure in pipes, channels etc.
B. very low pressure
C. atmospheric pressure
D. difference of pressure between two points
E. velocity in pipes
The line of action of the buoyant force acts through the centroid of the ___________________?
A. volume of the floating body
B. submerged body
C. volume of the fluid vertically above the body
D. displaced volume of the fluid
E. none of the above
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. 4 m of water column
B. 3 meters of water column
C. 3.5 meters of water column
D. 2 meters of water column
E. none of the above