Free Civil Engineering MCQs Mock Test Online with Answers

Q1 : 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

Q2 : 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

Q3 : 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: 900 minutes B: 4 minutes C: 4 x (225)3/2 minutes D: 4 x V225 minutes

Q4 : The minimum diameter of a sewer is kept __________________?

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

Q5 : Viscosity of water in comparison to mercury is ______________________?

A: higher B: lower C: same D: unpredictable.

Q6 : 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

Q7 : 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

Q8 : Cavitation will begin when______________________?

A: the pressure at any location reaches an absolute pressure equal to the saturated vapour pressure of the liquid B: pressure becomes more than critical pressure C: flow is increased D: pressure is increased

Q9 : Pick up the incorrect statement from the following?

A: The process of decomposing the organic matter under controlled anaerobic conditions, is called sludge digestion B: Sludge digestion is carried out in sludge tank C: The gases produced in sludge digestion process, contain 75% carbon dioxide D: The gases produced in sludge digestion process, contain 75% methane

Q10 : 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

Q11 : 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

Q12 : If the diameter of a sewer is 150 mm, the gradient required for generating self cleansing velocity, is________________?

A: 1 in 60 B: 1 in 100 C: 1 in 120 D: None of these

Q13 : A pressure of 25 m of head of water is equal to________________?

A: 25 kN/m2 B: 2500 kN/m2 C: 2.5kN/m2 D: 12.5 kN/m2

Q14 : The resultant upward pressure of the fluid on an immersed body due to its tendency to uplift the sub-merged body is called___________________?

A: upthrust B: reaction C: buoyancy D: metacentre

Q15 : An ideal flow of any fluid must fulfill the following______________?

A: Newton’s law of motion B: Newton’s law of viscosity C: Pascal’ law D: Continuity equation

Q16 : Dynamic viscosity of most of the liquids with rise in temperature____________________?

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

Q17 : 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

Q18 : Which of the following instruments is used to measure flow on the application of Bernoulli’s theorem __________________?

A: Venturimeter B: Orifice plate C: nozzle D: all of the above

Q19 : 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

Q20 : The stress-strain relation of the newtoneon fluid is________________?

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

Q21 : An ideal flow of any fluid must satisfy ___________________?

A: Pascal law B: Newton’s law of viscosity C: boundary layer theory D: continuity equation

Q22 : If q is the average sewage flow from a city of population P, the maximum sewage flow______________?

A: Q = [(4 + )/(18 + )] q B: Q = [(18 + P)/(4 + )] q C: Q = [(18 + )/(4 + )] q D: Q = [(5 + )/((15 + )] q

Q23 : 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: 9,000 kg B: 13,500 kg C: 18,000 kg D: 27,000 kg

Q24 : An inverted siphon is designed generally for____________________?

A: One pipe B: Two pipes C: Three pipes D: Four pipes

Q25 : For very great pressures, viscosity of moss gases and liquids __________________?

A: remains same B: increases C: decreases D: shows erratic behaviour

Q26 : Kjeldahl nitrogen is a mixture of___________________?

A: Ammonia and nitrogen B: Nitrogen and organic nitrogen C: Organic nitrogen and ammonia D: All the above

Q27 : 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

Q28 : If 2% solution of a sewage sample is incubated for 5 days at 20°C and depletion of oxygen was found to be 5 ppm, B.O.D. of the sewage is____________________?

A: 200 ppm B: 225 ppm C: 250 ppm D: None of these

Q29 : Metacentre is the point of intersection of _________________________?

A: vertical upward force through e.g. of body and center line of body B: buoyant force and the center line of body C: mid point between e.g. and center of buoyancy D: all of the above

Q30 : The flow in which the particles of a fluid attain such velocities that vary from point to point in magnitude and direction as well as from instant to instant, is known as_________________?

A: one dimensional flow B: uniform flow C: steady flow D: turbulent flow

Q31 : Principle of similitude forms the basis of__________________?

A: comparing two identical equipments B: designing models so that the result can be converted to prototypes C: comparing similarity between design and actual equipment D: hydraulic designs

Q32 : Which one of the following statements regarding septic tanks is wrong ?

A: A gap of 7.5 cm between the bottom of the covering slab and the top level of scum is provided B: The outlet invert level is kept 5 to 7.5 cm below the inlet invert level C: The minimum width of septic level is 90 cm D: The depth of tank is kept equal to its width

Q33 : Reynolds number is significant in____________________?

A: supersonics, as with projectile and jet propulsion B: full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc C: simultaneous motion through two fluids where there is a surface of dis-continuity, gravity forces, and wave making effect, as with ship’s hulls D: all of the above

Q34 : 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

Q35 : 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: h B: wh C: w/h D: h/w

Q36 : In an immersed body, center 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 e.g. depending on density of body and liquid

Q37 : Pitot tube is used for measurement of__________________?

A: pressure B: flow C: velocity D: dsscharge

Q38 : The normal value of over flow rates for plain primary sedimentation tanks, ranges between________________?

A: 25,000 to 35,000 litres/sqm/day B: 40,000 to 50,000 litres/sqm/day C: 50,000 to 60,000 litres/sqm/day D: 80,000 to 100,000 litres/sqm/day

Q39 : Fluid is a substance which offers no resistance to change of_________________?

A: pressure B: flow C: shape D: temperature

Q40 : Nitrogen cycle of sewage, is____________________?

A: Liberation of ammonia-formation of nitrites-formation of nitrates-liberation of nitrogen B: Liberation of nitrogen-liberation of ammonia-formation of nitrites- formation of nitrates C: Liberation of nitrogen-formation of nitrates-formation of nitrites-liberation of ammonia D: Formation of nitrates-formation of nitrites-liberation of nitrates-liberation of nitrates

Q41 : The factor responsible for purification of sewage in river is________________?

A: Hydrology B: Dissolved oxygen in water C: Temperature D: All the above

Q42 : Choose the wrong statement?

A: any weight, floating or immersed in a liquid, is acted upon by a buoyant force B: Buoyant force is equal to the weight of the liquid displaced C: The point through which buoyant force acts, is called the center of buoyancy D: Center of buoyancy is located above the center of gravity of the displaced liquid v

Q43 : The speed of sound in a ideal gas varies directly as its ______________?

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

Q44 : For a body floating in a liquid the normal pressure exerted by the liquid acts at _________________?

A: bottom surface of the body B: e.g. of the body C: metacentre D: all points on the surface of the body

Q45 : Rain drops are spherical because of____________________?

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

Q46 : Rotameter is a device used to measure____________________?

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

Q47 : Dilution method of disposing of sewage, is not preferred to_______________?

A: When sewage is fresh B: When diluting water has high dissolved oxygen content C: When diluting water is used for water supply near the point of sewage disposed D: When the diluting water is having flow currents

Q48 : In circular sewers if depth of flow is 0.2 times the full depth, the nominal gradient,______________?

A: Is only provided B: Is doubled C: Is trebled D: Is not enough

Q49 : 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

Q50 : 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 simply float over the mercury B: the metal piece will be immersed in mercury by half 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

Q51 : 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

Q52 : 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: higher than the surface of liquid B: the same as the surface of liquid C: lower than the surface of liquid D: unpredictable

Q53 : The bulk modulus of elasticity with increase in pressure___________________?

A: increases B: decreases C: remains constant D: increases first upto certain limit and then decreases

Q54 : The tendency of a liquid surface to contract is due to the following property_________________?

A: cohesion B: adhesion C: surface tension D: elasticity

Q55 : For hypersonic flow, the Mach number is___________________?

A: unity B: greater than unity C: greater than 2 D: greater than 4

Q56 : Total pressure on a lmxlm gate immersed vertically at a depth of 2 m below the free water surface will be ___________________?

A: 1000 kg B: 4000 kg C: 2000 kg D: 8000 kg

Q57 : Liquids________________?

A: cannot be compressed B: occupy definite volume C: are not affected by change in pressure and temperature D: none of the above

Q58 : The fluid forces considered in the Navier Stokes equation are__________________?

A: gravity, pressure and viscous B: gravity, pressure and turbulent C: gravity, viscous and turbulent D: none of the above

Q59 : 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

Q60 : Dimensions of surface tension are_________________?

A: MlL°T2 B: MlL°Tx C: MlL2T2 D: MlL°t

Q61 : A drop manhole is provided if__________________?

A: A sewer drops from a height B: A branch sewer joins the main sewer at higher level C: A lamp is inserted to check obstruction D: None of these

Q62 : Ratio of inertia force to elastic force is known as _____________________?

A: Mach number B: Froude number C: Reynold’s number D: Weber’s number

Q63 : All the terms of energy in Bernoulli’s equation have dimension of_______________?

A: energy B: work C: length D: mass

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 : 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

Q66 : 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

Q67 : 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

Q68 : To maintain aerobic biological activity, the moisture content of the compost mass should be about_________________?

A: 45 % B: 50 % C: 55 % D: 60 %

Q69 : Cavitation is caused by___________________?

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

Q70 : Falling drops of water become spheres due to the property of ________________?

A: adhesion B: cohesion C: surface tension D: viscosity

Q71 : The line of action of the buoyant force acts through the centroid of the ___________________?

A: submerged body B: volume of the floating body C: volume of the fluid vertically above the body D: displaced volume of the fluid

Q72 : 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

Q73 : The velocity of jet of water travelling out of opening in a tank filled with water is proportional to___________________?

A: head of water (h) B: h2 C: V/T D: h3/1.

Q74 : The buoyancy depends on__________________?

A: mass of liquid displaced B: viscosity of the liquid C: pressure of the liquid displaced D: depth of immersion

Q75 : The gas which may cause explosion in sewers, is_________________?

A: Carbondioxide B: Methane C: Ammonia D: Carbon monoxide

Q76 : In septic tanks__________________?

A: Free board of 0.3 m may be provided B: The baffles or tees are extended up to top level of scum C: The clear space between the baffle top and covering slab is about 7.5 cm D: All the above

Q77 : For design of sewers, percentage of sewage discharge is assumed_____________________?

A: 65 to 70% B: 70 to 75% C: 75 to 80% D: 85%

Q78 : 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: pitot tube

Q79 : The water carried sewerage system removes__________________?

A: Domestic sewage B: Industrial sewage C: Storm sewage D: .All the above

Q80 : 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: sin 9 B: sin 9 C: casS D: cos 9

Q81 : Capillary action is due to the__________________?

A: surface tension B: cohesion of the liquid C: adhesion of the liquid molecules and the molecules on the surface of a solid D: all of the above

Q82 : The units of kinematic viscosity are_______________?

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

Q83 : 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

Q84 : The amount of oxygen consumed by the aerobic bacterias which cause the aerobic biological decomposition of sewage, is known_________________?

A: Bio-Chemical Oxygen Demand (B.O.D.) B: Dissolved Oxygen (D.O.) C: Chemical Oxygen Demand (C.O.D.) D: None of these

Q85 : In a forced vortex, the velocity of flow everywhere within the fluid is__________________?

A: maximum B: minimum C: zero D: non-zero finite

Q86 : The volumetric change of the fluid caused by a resistance is known as_________________?

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

Q87 : 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

Q88 : Kinematic viscosity is dependent upon________________?

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

Q89 : For measuring flow by a venturimeter, if should be installed in__________________?

A: vertical line B: horizontal line C: inclined line with upward flow D: in any direction and in any location

Q90 : Froude number is significant in____________________?

A: supersonics, as with projectile and jet propulsion B: full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc. C: simultaneous motion through two fluids where there is a surface of dis-continuity, gravity forces, and wave making effect, as with ship’s hulls D: all of the above

Q91 : 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

Q92 : Sewer pipes are designed for maximum discharge with 25% to 33% vacant cross-sectional area for__________________?

A: Unexpected large scale infiltration of stream water B: Unexpected increase in the population C: Under estimates of maximum and average flows D: All of the above

Q93 : Barometer is used to measure__________________?

A: pressure in pipes, channels etc. B: atmospheric pressure C: very low pressure D: rain level

Q94 : The flow in which conditions do not change with time at any point, is known as _____________________?

A: one dimensional flow B: uniform flow C: steady flow D: turbulent flow

Q95 : Dried sewage after treatment is used as____________________?

A: Fertilizer B: Building material C: Chemical for lowering B.O.D. D: Base material for paints

Q96 : Choose the wrong statement?

A: fluids are capable of flowing B: fluids conform to the shape of the con-taining vessels C: when in equilibrium, fluids cannot sustain tangential forces D: when in equilibrium, fluids can sustain shear forces

Q97 : Antisyphonage pipe is fitted_______________?

A: At the end of septic tanks B: On manholes C: With a W.C. trap D: At the beginning of sewer line

Q98 : A perfect gas_________________?

A: has constant viscosity B: has zero viscosity C: is incompressible D: none of the above

Q99 : Dynamic viscosity of most of the gases with rise in temperature___________________?

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

Q100 : The equation of continuity holds good when the flow __________________?

A: is steady B: is one dimensional C: velocity is uniform at all the cross sec-tions D: all of the above

Free Civil Engineering MCQs Mock Test Online with Answers

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