Free Civil Engineering MCQs Mock Test Online with Answers

Q1 : Select the correct statement ?

A: Local atmospheric pressure depends upon elevation of locality only B: Standard atmospheric pressure is the mean local atmospheric pressure a* sea level C: Local atmospheric pressure is always below standard atmospheric pressure D: A barometer reads the difference be-tween local and standard atmospheric pressure

Q2 : 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: 2 meters of water column B: 3 meters of water column C: 5 meters of water column D: 6 meters of water Column

Q3 : Flow of water in a pipe about 3 meters in diameter can be measured by_________________?

A: orifice plate B: venturi C: rotameter D: pitot tube

Q4 : 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

Q5 : The bulk modulus of elasticity __________________?

A: has the dimensions of 1/pressure B: increases with pressure C: is large when fluid is more compressible D: is independent of pressure and viscosity

Q6 : The specific weight of water is 1000 kg/m” _______________?

A: at normal pressure of 760 mm B: at 4°C temperature C: at mean sea level D: all the above

Q7 : Uniform flow occurs when____________________?

A: the flow is steady B: the flow is streamline C: size and shape of the cross section in a particular length remain constant D: flow occurs at constant fate

Q8 : Two pipe systems can be said to be equivalent, when the following quantites are same______________?

A: friction loss and flow B: length and diameter C: flow and length D: friction factor and diameter

Q9 : 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

Q10 : 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

Q11 : Kjeldahl nitrogen is a mixture of___________________?

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

Q12 : Fluid is a substance which offers no resistance to change of_________________?

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

Q13 : The maximum depth of sedimentation tanks, is kept__________________?

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

Q14 : 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

Q15 : 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

Q16 : Dried sewage after treatment is used as____________________?

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

Q17 : 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

Q18 : 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

Q19 : The reduced levels of the string at the consecutive sight rails A and B are 203.575 m, 203.475 m respectively. If the difference of their R.D.s is 10 m, the gradient of the sewer line is_________________?

A: 1 in 100 upward B: 1 in 500 upward C: 1 in 100 downward D: 1 in 503 upward

Q20 : To maintain aerobic biological activity, the moisture content of the compost mass should be about_________________?

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

Q21 : 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

Q22 : 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

Q23 : 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

Q24 : The grit and silt of the grit chambers, may not be used for_________________?

A: Raising low lying areas by dumping B: Concreting C: Both A. and B. D: Neither A. nor B

Q25 : 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

Q26 : Pick up the correct statement from the following?

A: The boning rod is used for checking the levels of the sewer inverts B: Manhole covers are made circular for the convenience of the cleaning staff C: A manhole is classified as shallow manhole if its depth is less than 0.9 m D: All the above

Q27 : 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

Q28 : 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

Q29 : 4-61. Kinematic viscosity is equal to________________?

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

Q30 : 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: 500 kg B: 1000 kg C: 1500 kg D: 2000 kg

Q31 : If no resistance is encountered by displacement, such a substance is known as___________________?

A: fluid B: water C: gas D: ideal fluid

Q32 : 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

Q33 : 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

Q34 : 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

Q35 : The density of water is 1000 kg/m3 at __________________?

A: 0°C B: 0°K C: 4°C D. 20°C D: all temperature

Q36 : 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

Q37 : Mach number is significant in___________________?

A: supersonics, as with projectiles 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 force, and wave making effects, as with ship’s hulls D: none of the above

Q38 : The sewer that unloads the sewage at the point of treatment is called_________________?

A: Main sewer B: Outfall sewer C: Branch sewer D: House sewer

Q39 : 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

Q40 : 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

Q41 : 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

Q42 : 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

Q43 : 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.

Q44 : Liquids________________?

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

Q45 : Newton’s law of viscosity is a relationship between________________?

A: shear stress anctthejiate of angular distortion B: shear stress and viscosity C: shear stress, velocity and viscosity D: pressure, velocity and viscosity

Q46 : The layers of vegetable wastes and night soil alternatively piled above the ground to form a mound, is called_______________?

A: A heap B: Plateau C: Windrow D: None of these

Q47 : 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

Q48 : The minimum diameter of a sewer is kept __________________?

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

Q49 : 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

Q50 : 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

Q51 : For detecting the nitrates in sewage, the colour may be developed by adding________________?

A: Potassium permanganate B: Sulphuric acid and napthamine C: Phenol-di -sulphuric acid and potassium hydroxide D: None of these

Q52 : 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

Q53 : 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

Q54 : Pick up the in-correct statement from the following?

A: Manholes are provided in sewer pipes at suitable intervals B: Catch basins are generally provided in sewers for carrying drainage discharge C: Inlets are generally provided in all sewers D: None of these

Q55 : 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

Q56 : Dimensions of surface tension are_________________?

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

Q57 : 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

Q58 : 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

Q59 : 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

Q60 : The ratio of absolute viscosity to mass density is known as____________________?

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

Q61 : Rotameter is a device used to measure____________________?

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

Q62 : 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

Q63 : If the flame of a miner’s safety lamp in a manhole extinguishes within 5 minutes, the sewer certainly contains_______________?

A: Hydrogen sulphide B: Carbon dioxide C: Methane D: Oxygen

Q64 : 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

Q65 : The settling velocity of the particles larger than 0.06 mm in a settling tank of depth 2.4 is 0.33 m per sec. The detention period recommended for the tank, is____________________?

A: 30 minutes B: 1 hour C: 1 hour and 30 minutes D: 2 hours

Q66 : Bernoulli equation deals with the law of conservation of____________________?

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

Q67 : Pick up the correct statement from the following?

A: Indore method of composting involves decomposition under aerobic conditions B: Bangalore method of composting involves decomposing under anaerobic conditions C: Fully stabilised refuse by the Bangalore method of compositing is a powdery mass called humus D: all of these

Q68 : 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

Q69 : The property of a fluid which enables it to resist tensile stress is known as________________?

A: compressibility B: cohesion C: adhesion D: viscosity.

Q70 : For design of sewers, percentage of sewage discharge is assumed_____________________?

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

Q71 : 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

Q72 : 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

Q73 : 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

Q74 : Pick up the incorrect statement from the following for allowing workers to enter sewers_______________?

A: The particular manhole and one manhole on upstream and one manhole on downstream should remain open for 30 minutes B: Proper tests for the presence of poisonous gases must be carried out C: The men entering the manhole should be advised to smoke in the sewer D: Warning signals should be erected

Q75 : Stone ware pipes are_______________?

A: Highly resistant to sulphide corrosion B: Highly impervious C: Hydraulically efficient because of their smooth interior surface D: Especially suited to pressure pipes

Q76 : 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

Q77 : 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

Q78 : Kinematic viscosity is dependent upon________________?

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

Q79 : Which of the following is dimensionless ________________?

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

Q80 : The property of fluid by virtue of which it offers resistance to shear is called____________________?

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

Q81 : In a forced vortex, the velocity of flow everywhere within the fluid is__________________?

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

Q82 : 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

Q83 : 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

Q84 : The buoyancy depends on__________________?

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

Q85 : The discharge per unit plan area of a sedimentation tank, is generally called________________?

A: Over flow rate B: Surface loading C: Over flow velocity D: All the above

Q86 : Surface tension _____________________?

A: acts in the plane of the interface normal to any line in the surface B: is also known as capillarity C: is a function of the curvature of the interface D: decreases with fall in temperature

Q87 : 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 and more at high temperature

Q88 : 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

Q89 : Ratio of inertia force to elastic force is known as _____________________?

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

Q90 : Property of a fluid by which its own molecules are attracted is called ________________?

A: adhesion B: cohesion C: viscosity D: compressibility

Q91 : For very great pressures, viscosity of moss gases and liquids __________________?

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

Q92 : 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

Q93 : 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

Q94 : 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.

Q95 : 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

Q96 : Gradually varied flow is____________________?

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

Q97 : In a fully mechanised composting plant, involves________________?

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

Q98 : 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

Q99 : 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

Q100 : Choose the wrong statement ?

A: The center of buoyancy is located at the center of gravity of the displaced liquid B: For stability of a submerged body, the center of gravity of body must lie directly below the center of buoyancy C: If e.g. and center of buoyancy coincide, the submerged body must lie at neutral equilibrium for all positions D: All floating bodies are stable

Free Civil Engineering MCQs Mock Test Online with Answers

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