PPSC Sub Engineer Civil Past Papers MCQs curated from previous years’ tests to help you understand key concepts, exam patterns, and important questions for effective preparation.
PPSC Sub Engineer Civil Past Papers
For pipes, laminar flow occurs when Reynolds number is:
A. less than 2000
B. between 2000 and 3000
C. more than 3000
D. less than 3000
The fluid forces considered in the Naiver Stokes equation are_:
A. Gravity, pressure and viscous
B. gravity, pressure and turbulent
C. pressure, viscous and turbulent
D. gravity, viscous and turbulent
All the terms of energy in Bernoulli’s equation have dimension of:
A. energy
B. work
C. mass
D. length
For hypersonic flow, the Mach number is :
A. greater than unity
B. greater than 2
C. greater than 4
D. greater than 10
Normal depth in open channel flow is the depth of flow corresponding to:
steady flow
B. unsteady flow
C. laminar flow
D. uniform flow
E. critical flow
Pitot tube is used for measurement of:
A. flow
B. velocity
C. discharge
D. viscosity
Mach number is significant in:
A. supersonics, as with projectiles and jet propulsion
B. full immersion
C. all of the above
D. none of the above
The equation of continuity holds good when the flow :
A. is steady
B. is one dimensional
C. velocity is uniform at all
D. all of the above
A large Reynold number is indication of:
A. smooth and streamline flow
B. laminar flow
C. steady flow
D. highly turbulent flow
For pipes, turbulent flow occurs when Reynolds number is:
A. less than 2000
B. between 2000 and 4000
C. more than 4000
D. less than 4000
Bernoulli equation deals with the law of conservation of:
A. mass
B. momentum
C. energy
D. work
Cavitation is caused by:
A. high velocity
B. high pressure
C. weak material
D. low pressure
Hydrometer is used to determine :
A. specific gravity of liquids
B. specific gravity of solids
C. specific gravity of gases
D. relative humidity
The upper surface of a weir over which water flows is known is :
A. crest
B. nappe
C. sill
D. weir top
In a free vortex motion, the radial component of velocity everywhere is :
A. maximum
B. minimum
C. zero
D. non-zero
General energy equation holds for :
A. steady flow
B. turbulent flow
C. laminar flow
D. non-uniform flow
The flow which neglects changes in a transverse direction is known as :
A. one dimensional flow
B. uniform flow
C. steady flow
D. turbulent flow
Flow occurring in a pipeline when a valve is being opened is :
A. steady
B. unsteady
C. laminar
D. vortex
For measuring flow by a venturimeter, if should be installed in :
A. vertical line
B. horizontal line
C. inclined line with flow downward
D. In any direction and in any location
An ideal flow of any fluid must satisfy :
A. Pascal law
B. Newton’s law of viscosity
C. boundary layer theory
D. continuity equation
Gradually varied flow is :
A. steady uniform
B. non-steady non-uniform
C. non-steady uniform
D. steady non-uniform
During the opening of a valve in a pipe line, the flow is :
A. steady
B. unsteady
C. uniform
D. laminar
In the case of steady flow of a fluid, the acceleration of any fluid particle is :
A. constant
B. variable
C. zero
D. zero
Flow of water in a pipe about 3 meters in diameter can be measured by :
A. orifice plate
B. venture
C. rotameter
D. pitot tube
Rotameter is a device used to measure :
A. absolute pressure
B. velocity of fluid
C. flow
D. rotation
The time oscillation of a floating body with increase in metacentric height will be :
A. same
B. higher
C. lower
D. lower/high
In an immersed body, centre 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
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
The two important forces for a floating body are :
A. buoyancy, gravity
B. buoyancy, pressure
C. buoyancy, inertial
D. inertial, gravity
Center of pressure on an inclined plane is :
A. at the centroid
B. above the centroid
C. below the centroid
D. at metacenter
Ratio of inertia force to elastic force is known as :
A. Mach number
B. Froude number
C. Reynold’s number
D. Weber’s number
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
Ratio of inertia force to surface Jension is known as :
A. Mach number
B. Froude number
C. Reynold’s number
D. Weber’s number
The horizontal component of buoyant force is :
A. negligible
B. same as buoyant force
C. zero
D. non of these
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
Centre of pressure compared to e.g. is :
A. above it
B. below it
C. at same point
D. above or below
Metacentric height is the distance between the metacentre and :
A. water surface
B. center of pressure
C. center of gravity
D. center of buoyancy
The resultant of all normal pressures acts :
A. at e.g. of body
B. at center of pressure
C. vertically upwards
D. at metacentre
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
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
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
Dynamic viscosity of most of the gases with rise in temperature :
A. increases
B. decreases
C. remains unaffected
D. unpredictable
The speed of sound in a ideal gas varies directly as its :
A. pressure
B. temperature
C. density
D. absolute temperature
Dynamic viscosity of most of the liquids with rise in temperature :
A. increases
B. decreases
A. remains unaffected
D. unpredictable
E. none of the above
Which of the following instrument can be used for measuring speed of a submarine moving in deep sea :
A. Venturimeter
B. Orifice plate
C. hot wire anemometer
D. rotameter
E. pitot tube
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
Dynamic viscosity of most of the gases with rise in temperature :
A. increases
B. decreases
C. remains unaffected
D. unpredictable
Which of the following instruments is used to measure flow on the application of Bernoulli’s theorem :
A. all of the above
B. Orifice plate
C. nozzle
D. pitot tube
The speed of sound in a ideal gas varies directly as its :
A. Absolute temperature
B. temperature
C. density
D. modulus of elasticity
Dynamic viscosity of most of the liquids with rise in temperature :
A. increases
B. decreases
A. remains unaffected
D. unpredictable
Barometer is used to measure :
A. pressure in pipes, channels etc.
B. atmospheric pressure
C. very low pressure
D. difference of pressure
Pressure of the order of “10” torr can be measured by :
A. Bourdon tube
B. Pirani Gauge
C. micro-manometer
D. ionisation gauge
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
The difference of pressure between the inside and outside of a liquid drop is :
A.p = Txr
B.p = T/r
C. p = T/2r
D. p = 2T/r
E. none of the above
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
The capillary rise at 20°C in a clean glass tube of 1 mm bore containing water is ap-proximately :
A. 30 mm
B. 5 mm
C. 10 mm
D. 20 mm
The difference of pressure between the inside and outside of a liquid drop is :
A.p = Txr
B.p = T/r
C. p = T/2r
D. p = 2T/r
The continuity equation is connected with :
A. viscous/unviscous fluids
B. compressibility of fluids
C. conservation of mass
D. steady/unsteady flow
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
Capillary action is due to the :
A. surface tension
B. cohesion of the liquid
C. all of the above
D. none of the above
The units of dynamic or absolute viscosity are :
A. metres2 per sec
B. kg sec/meter
C. newton-sec per meter
D. newton-sec2 per meter
E. none of the above
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
Rain drops are spherical because of :
A. viscosity
B. air resistance
C. surface tension forces
D. atmospheric pressure
The centre 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
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
Poise is the unit of :
A. surface tension
B. capillarity
C. viscosity
D. shear stress in fluids
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
A liquid would wet the solid, if adhesion forces as compared to cohesion forces are :
A. less
B. more
C. equal
D. less at low temperature
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. 2.5kN/m2
A one dimensional flow is one which :
A. is uniform flow
B. is steady uniform flow
C. takes place in straight lines
D. involves zero transverse component of flow
4-61. Kinematic viscosity is equal to :
A. dynamic viscosity/density
B. dynamicviscosity x density
C. density/dynamic viscosity
D. 1/dynamicviscosity x density
The units of kinematic viscosity are :
A. metres2 per sec
B. kg sec/meter
C. newton-sec per meter
D. newton-sec per meter
Dimensions of surface tension are :
A. MlL°T2
B. MlL°Tx
C. MlL r2
D. MlL2T2
Which of the following meters is not associated with viscosity :
A. Red wood
B. Say bolt
C. Engler
D. Orsat
Kinematic viscosity is dependent upon :
A. pressure
B. distance
C. level
D. density
The units of viscosity are :
A. metres2 per sec
B. kg sec/metre
C. newton-sec per metre2
D. newton-sec per metre
Surface tension has the units of :
A. newtons/m
B. newtons/m
C. new tons/m
D. newtons
The increase of temperature results in :
A. increase in viscosity of gas
B. increase in viscosity of liquid
C. decrease in viscosity of gas
D. decrease in viscosity of liquid
In a static fluid :
A. resistance to shear stress is small
B. fluid pressure is zero
C. linear deformation is small
D. only normal stresses can exist
E. viscosity is nil
A balloon lifting in air follows the following principle :
A. law of gravitation
B. Archimedes principle
C. principle of buoyancy
D. all of the above
E. continuity equation
The bulk modulus of elasticity with increase in pressure :
A. increases
B. decreases
C. remains constant
D. increases firs
A fluid in equilibrium can’t sustain :
A. tensile stress
B. compressive stress
C. shear stress
D. bending stress
The stress-strain relation of the newton eon fluid is :
A. linear
B. parabolic
C. hyperbolic
D. inverse type
Surface tension has the units of :
A. newtons/m
B. newtons/m
C. new tons/m
D. newtons
E. newton m
A perfect gas :
A. has constant viscosity
B. has zero viscosity
C. is incompressible
D. none of the above
In a static fluid :
A. resistance to shear stress is small
B. fluid pressure is zero
C. linear deformation is small
D. only normal stresses can exist
A balloon lifting in air follows the following principle :
A. law of gravitation
B. Archimedes principle
C. principle of buoyancy
D. all of the above
A fluid in equilibrium can’t sustain :
A. tensile stress
B. compressive stress
C. shear stress
D. bending stress
The tendency of a liquid surface to contract is due to the following property :
A. cohesion
B. adhesion
C. viscosity
D. surface tension
Which of the following is dimensionless :
A. specific weight
B. specific volume
C. specific speed
D. specific gravity
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 xlO6N/m3
Mercury does not wet glass. This is due to property of liquid known as :
A. adhesion
B. cohesion
C. surface tension
D. viscosity
The value of mass density in kgsecVm4 for water at 0°C is :
A. 1
B. 1000
C. 100
D. 101.9
An ideal flow of any fluid must fulfil the following :
A. Newton’s law of motion
B. Newton’s law of viscosity
C. Pascal’ law
D. Continuity equation
Fluid is a substance which offers no resistance to change of :
A. pressure
B. flow
C. shape
D. volume
The buoyancy depends on :
A. mass of liquid displaced
B. viscosity of the liquid
C. pressure of the liquid displaced
D. depth of immersion
Falling drops of water become spheres due to the property of :
A. adhesion
B. cohesion
C. surface tension
D. viscosity
Which of the following is the unit of kinematic viscosity :
A. pascal
B. poise
C. stoke
D. faraday
The density of water is 1000 kg/m3 at :
A. 0°C
B. 0°K
C. 4°C D. 20°C
For manometer, a better liquid combination is one having :
A. higher surface tension
B. lower surface tension
C. surface tension is no criterion
D. high density and viscosity
Units of surface tension are :
A. energy/unit area
B. distance
C. both of the above
D. it has no units
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