Free Civil Engineering MCQs Mock Test Online with Answers

Q1 : Density of water is maximum at ___________________?

A: 0°C B: 0°K C: 4°C D: 100°C

Q2 : 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

Q3 : The spacing of bars of perforations of fine screens used for the treatment of sewage, is_______________?

A: 2 to 3 mm B: 3 to 5 mm C: 5 to 8 mm D: 8 to 10 mm

Q4 : For evaporation and measurement of settable solids, the apparatus used, is________________?

A: A jar B: A breaker C: A test tube D: An Imhoff cone

Q5 : The ratio of the diameter of a circular section and the side of a square section hydraulically equivalent, is____________________?

A: 1.095 B: 1.085 C: 1.075 D: 1.065

Q6 : 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

Q7 : The volumetric change of the fluid caused by a resistance is known as_________________?

A: volumetric strain B: volumetric index C: compressibility D: adhesion

Q8 : The ratio of absolute viscosity to mass density is known as____________________?

A: specific viscosity B: viscosity index C: kinematic viscosity D: coefficient of viscosity

Q9 : 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

Q10 : The sewers___________________?

A: Must be of adequate size to avoid over flow B: Must flow under gravity ½ to ¾ full C: Must be laid at least 2 to 3 m deep to collect /water from the basements D: All the above

Q11 : ‘Cowl’ is provided at___________________?

A: Lower end of ventilating column B: Upper end of ventilating column C: Upper end of the manhole D: First step in manhole

Q12 : 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 has zero viscosity D: it is at rest.

Q13 : The flow velocity in detritus tanks is________________?

A: 0.05 m/sec B: 0.09 m/sec C: 1.25 m/sec D: None of these

Q14 : 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

Q15 : 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

Q16 : The clarigesters are_________________?

A: Circular septic tanks B: Rectangular septic tanks C: Circular Imhoff double tanks with bottom hoppers D: Circular Imhoff double storey tanks without bottom hoppers

Q17 : 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

Q18 : 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

Q19 : 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

Q20 : 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

Q21 : 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

Q22 : The speed of sound in a ideal gas varies directly as its ______________?

A: pressure B: temperature C: density D: absolute temperature

Q23 : Gradually varied flow is____________________?

A: steady uniform B: non-steady non-uniform C: non-steady uniform D: steady non-uniform

Q24 : The rate of accumulation of sludge per person per year, is_______________________?

A: 10 litres B: 15 litres C: 20 litres D: 25 litres

Q25 : In order that flow takes place between two points in a pipeline, the differential pressure between thes^ points must be more than_________________?

A: frictional force B: viscosity C: surface friction D: all of the above

Q26 : In areas where rainy season is limited to a few months, the type of sewerage system recommended is__________________?

A: Combined system B: Partially separate system C: Separate system D: None of these

Q27 : 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 flow C: steady flow D: turbulent flow

Q28 : 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.

Q29 : 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

Q30 : 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

Q31 : Rotameter is a device used to measure____________________?

A: absolute pressure B: velocity of fluid C: flow D: rotation

Q32 : 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

Q33 : The two important forces for a floating body are___________________?

A: The two important forces for a floating body are___________________? B: buoyancy, pressure C: buoyancy, inertial D: inertial, gravity

Q34 : The stress-strain relation of the newtoneon fluid is________________?

A: linear B: parabolic C: hyperbolic D: inverse type

Q35 : Drop manholes are the manholes___________________?

A: Without entry ladders B: Without manhole covers C: With depths more than 3.5 m D: Having drains at different levels

Q36 : For similarity, in addition to models being geometrically similar to prototype, the following in both cases should also be equal__________________?

A: ratio of inertial force to force due to viscosity B: ratio of inertial force to force due to gravitation C: ratio of inertial force to force due to surface tension D: all the four ratios of inertial force to force due to viscosity, gravitation, surface tension, and elasticity

Q37 : The point in the immersed body through which the resultant pressure of the liquid may be taken to act is known as____________________?

A: meta center B: center of pressure C: center of buoyancy D: center of gravity

Q38 : A piece of wood having weight 5 kg floats in water with 60% of its volume under the liquid. The specific gravity of wood is__________________?

A: 0.83 B: 0.6 C: 0.4 D: none of the above

Q39 : The vapour pressure over the concave surface is__________________?

A: less man the vapour pressure over the plane surface B: equal to the vapour pressure over the plane surface C: greater than the vapour pressure over the plane surface D: none of the above

Q40 : 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

Q41 : 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

Q42 : Metacentric height is the distance between the metacentre and___________________?

A: water surface B: center of pressure C: center of gravity D: center of buoyancy

Q43 : 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

Q44 : If the depth of flow in a circular sewer is 1/4th of its diameter D, the wetted perimeter is______________?

A: /2 B: /4 C: /3 D: D

Q45 : During the opening of a valve in a pipe line, the flow is___________________?

A: steady B: unsteady C: uniform D: laminar

Q46 : Dynamic viscosity of most of the gases with rise in temperature___________________?

A: increases B: decreases C: remains unaffected D: unpredictable

Q47 : 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

Q48 : 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: none of the above

Q49 : The maximum depth of sedimentation tanks, is kept__________________?

A: 3 m B: 3.5 m C: 4 m D: 4.5 m

Q50 : The minimum diameter of a sewer is kept __________________?

A: 10 cm B: 15 cm C: 20 cm D: 25 cm

Q51 : If is the diameter of upper circular portion, the overall depth of New Egg shaped sewer section, Is_____________________?

A: 1.250 D B: 1.350 D C: 1.425 D D: 1.625 D

Q52 : A large Roynold number is indication of_________________?

A: smooth and streamline flow B: laminar flow C: steady flow D: highly turbulent flow

Q53 : 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

Q54 : 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

Q55 : 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 magnitude aricf direction of the velocity do not change from point to point in the fluid D: velocity, depth, pressure, etc. change from point to point in the fluid flow

Q56 : Kinematic viscosity is dependent upon________________?

A: pressure B: distance C: flow D: density

Q57 : 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

Q58 : Flow occurring in a pipeline when a valve is being opened is ______________________?

A: steady B: unsteady C: laminar D: vortex

Q59 : Pick up the incorrect size of stone ware sewers_________________?

A: 52.5 cm B: 67.5 cm C: 82.5 cm D: None of these

Q60 : 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

Q61 : 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

Q62 : 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

Q63 : 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

Q64 : In a residential colony, sewers of diameters 100 mm, 150 mm and 225 mm were laid with a gradient 1 in 120. Which portion of the sewage system does not choke in due course of time?

A: 100 mm dia. B: 150 mm dia. C: 225 mm dia. D: All of these

Q65 : Cavitation is caused by___________________?

A: high velocity B: high pressure C: weak material D: low pressure

Q66 : In sewers the velocity of flow should not be_________________?

A: More than the self-cleansing velocity B: Less than the self-cleansing velocity C: Less than 10 m/sec D: More than 20 m/sec

Q67 : 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

Q68 : Units of surface tension are_________________?

A: energy/unit area B: distance C: both of the above D: it has no units

Q69 : The continuity equation is connected with_______________?

A: viscous/unviscous fluids B: compressibility of fluids C: conservation of mass D: open channel/pipe flow

Q70 : Hazen’s formula VS = 418 (GS – Gw)d [(3T + 70)/100] is used for the settlement velocity of the particles of diameter______________________?

A: Less than 0.01 mm B: Less than 0.05 mm C: Less than 0.1 mm D: Greater than 0.1 mm

Q71 : Which of the following is dimensionless ________________?

A: specific weight B: specific volume C: specific speed D: specific gravity

Q72 : Rain drops are spherical because of____________________?

A: viscosity B: air resistance C: surface tension forces D: atmospheric pressure

Q73 : The units of viscosity are__________________?

A: metres2 per sec B: kg sec/metre C: newton-sec per metre2 D: newton-sec per metre

Q74 : The pH value of sewage is determined with the help of_________________?

A: Imhoff Cone B: Turbid meter C: Potentiometer D: None of these

Q75 : For a grit chamber, if the recommended velocity of flow is 0.2 m/sec and detention period is 2 minutes, the length of the tank, is__________________?

A: 16 m B: 20 m C: 24 m D: 30 m

Q76 : pH value of sludge during alkaline regression stage, is__________________?

A: More than 7 B: Less than 7 C: Less than 6 D: More than 6

Q77 : Pick up the correct statement from the following?

A: The circular section of sewers provides maximum hydraulic mean depth B: The circular sewers are provided for separate sewerage system C: The circular sewers work efficiently if the sections run at least half full D: All the above

Q78 : In a fully mechanised composting plant, involves________________?

A: Mechanized receipt B: Mechanized segregation C: Mechanized pulverising of refuse D: All of these

Q79 : 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

Q80 : The value of mass density in kgsecVm4 for water at 0°C is_______________?

A: 1 B: 1000 C: 100 D: 101.9

Q81 : 4-61. Kinematic viscosity is equal to________________?

A: dynamic viscosity/density B: dynamicviscosity x density C: density/dynamic viscosity D: 1/dynamicviscosity x density

Q82 : 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

Q83 : Imhoff cone is used to measure________________?

A: Total organic solids B: Total solids C: Total in organic solids D: Settleable solids

Q84 : The capillary rise at 20°C in a clean glass tube of 1 mm bore containing water is ap-proximately____________________?

A: 1 mm B: 5 mm C: 10 mm D: 30 mm

Q85 : The upper surface of a weir over which water flows is known is________________?

A: crest B: nappe C: sill D: weir top

Q86 : The minimum width of the fire escape stairs shall be?

A: 1.00 m B: 1.5 m C: 2.0 m D: 1.25 m

Q87 : To prevent settling down of sewage both at the bottom and on the sides of a large sewer, self-cleaning velocity recommended for Indian conditions, is_________________?

A: 0.50 m/sec B: 0.60 m/sec C: 0.70 m/sec D: 0.75 m/sec

Q88 : The total energy of each particle at various places in the case of perfect incompres sible fluid flowing in continuous sream________________?

A: keeps on increasing B: keeps on decreasing C: remains constant D: may increase/decrease

Q89 : For a floating body to be in stable equilibrium, its metacentre should be_________________ ?

A: below the center of gravity B: below the center of buoyancy C: above the center of buoyancy D: above the center of gravity

Q90 : 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

Q91 : Alcohol is used in manometer, because___________________?Choose the wrong statement ?

A: its vapour pressure is low B: it provides suitable meniscus for the inclined tube C: its density is less D: it provides accurate readings.

Q92 : 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

Q93 : For the COD test of sewage, organic matter is oxidised by K2Cr2O7 in the presence of________________?

A: H2SO4 B: HNO3 C: HCl D: None of these

Q94 : weight of water, the hydraulic mean depth of the sewer and the bed slope w is the unit of the sewer, then the tractive force exerted by flowing water, is________________________?

A: w r S S B: w r S C: w r1/2 D: w r2/3

Q95 : The detention time of a circular tank of diameter d and water depth H, for receiving the sewage Q per hour, is________________?

A: d² (0.011d + 0.785H)/Q B: d (0.022d + 0.085H)/Q C: d (0.785d + 0.011H)/Q D: d (0.285d + 0.011H)/Q

Q96 : General energy equation holds for_________________?

A: steady flow B: turbulent flow C: laminar flow D: non-uniform flow

Q97 : 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: steady flow D: streamline flow

Q98 : 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

Q99 : 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

Q100 : 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

Free Civil Engineering MCQs Mock Test Online with Answers

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