civil engineering Mcqs
2801. A fluid in equilibrium cant sustain_________________?
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A. compressive stress

B. bending stress

C. all of the above

D. shear stress

E. tensile stress

2802. A pressure of 25 m of head of water is equal to________________?
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A. 245 kN/m2

B. 12.5 kN/m2

C. 2.5kN/m2

D. 25 kN/m2

E. 2500 kN/m2

2803. The sewage is pumped up_______________?
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A. All the above

B. From flat areas

C. From basements

D. From low lying areas

2804. For laying a sewer line in a trench of 2 m width, an offset line is marked on the ground parallel to the given centre line at a distance of___________________?
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A. 160 cm

B. 120 cm

C. 100 cm

D. 140 cm

2805. It is customary to design a sewer for D.W.F. on the basis of________________?
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A. Twice the average demand

B. Thrice the average demand

C. Four times the average demand

D. Average demand

2806. Aerobic activity is maximum_______________?
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A. In sewer treatment plants

B. At sewer pipes

C. None of these

D. In freshly produced sewage
2807. The layers of vegetable wastes and night soil alternatively piled above the ground to form a mound, is called_______________?
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A. Windrow

B. None of these

C. A heap

D. Plateau

2808. Hazens formula VS = 418 (GS Gw)d [(3T + 70)/100] is used for the settlement velocity of the particles of diameter______________________?
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A. Less than 0.1 mm

B. Less than 0.05 mm

C. Greater than 0.1 mm

D. Less than 0.01 mm

2809. The discharge per unit plan area of a sedimentation tank, is generally called________________?
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A. Surface loading

B. Over flow velocity

C. Over flow rate

D. All the above
2810. In case of Imhoff tanks_____________________?
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A. Detention period is 2 hours

B. All the above

C. The shape is rectangular

D. The velocity of flow is restricted to 0.30 m/minute

2811. The ratio of minimum hourly flow to the average flow of sewage is_________________?
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A. 4-Jan

B. 2-Jan

C. 4-Mar

D. 1/3
2812. Sewer manholes are generally provided at________________?
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A. All of these

B. The junctions of sewers

C. The change of direction

D. The change of gradient

2813. The most effective arrangement for diverting excess storm water into a natural drainage, is____________________?
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A. Overflow weir

B. None of these

C. Leaping weir

D. Siphon spill way
2814. Water content of sewage is about___________________?
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A. 90%

B. 9.9 %

C. 99%

D. 95%

2815. The units of viscosity are__________________?
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A. none of the above

B. kg sec/metre

C. metres2 per sec

D. newton-sec per metre

E. newton-sec per metre2

2816. Antisyphonage pipe is fitted_______________?
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A. At the beginning of sewer line

B. With a W.C. trap

C. At the end of septic tanks

D. On manholes

2817. The asbestos cement pipes are generally laid___________________?
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A. Vertically

B. At an angle of 60

C. Horizontally

D. At an angle of 30

2818. The normal stress in a fluid will be constant in all directions at a point only if_________________?
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A. it is frictionless

B. it is incompressible

C. it has zero viscosity

D. it is at rest.

E. it has uniform viscosity

2819. If the flame of a miners safety lamp in a manhole extinguishes within 5 minutes, the sewer certainly contains_______________?
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A. Oxygen

B. Methane

C. Carbon dioxide

D. Hydrogen sulphide

2820. The conditions for the stable equilibrium of a floating body are_______________?
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A. the center of buoyancy and the center of gravity must lie on the same vertical line

B. a righting couple should be formed

C. all the above are correct

D. none of the above is correct

E. the meta-center should lie above the center of gravity

2821. At the junction of sewers___________________?
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A. Top of smaller sewer is kept lower

B. Top of larger sewer is kept lower

C. Tops of both the sewers are at the same level

D. None of these
2822. Which of the following meters is not associated with viscosity__________________?
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A. Orsat

B. none of the above

C. Red wood

D. Engler

E. Say bolt

2823. Assertion A.: The minimum self cleansing velocity in the sewer, at least once a day, must be generated. Reason (R): If certain deposition takes place and is not removed, it obstructs free flow and causes further deposition leading to complete blocking of the sewer?
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A. Both A and R are true and R is the correct explanation of A

B. Both A and R are true but R is not a correct explanation of A

C. A is true but R is false

D. A is false but R is true

2824. The pH value of sewage is determined with the help of_________________?
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A. Turbid meter

B. Imhoff Cone

C. Potentiometer

D. None of these

2825. Metacentric height is given as the distance between_______________?
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A. center of buoyancy and metacentre

B. the center of gravity of the body and the center of pressure

C. the center of gravity of the body andthe meta center

D. the center of gravity of the body and the center of buoyancy

E. none of the above

2826. For the COD test of sewage, organic matter is oxidised by K2Cr2O7 in the presence of________________?
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A. HNO3

B. None of these

C. HCl

D. H2SO4
2827. Removal of oil and grease from sewage, is known____________________?
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A. Skimming

B. Screening

C. Filtration

D. None of these

2828. The most dangerous pollutant in vehicular emissions is____________________?
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A. CO2

B. SO2

C. CO

D. O3

2829. In sewage, the solids in mg per litre is__________________?
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A. 500 to 1000

B. 1000 to 1500

C. 100 to 500

D. 1500 to 2000

2830. To maintain aerobic biological activity, the moisture content of the compost mass should be about_________________?
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A. 50%

B. 55 %

C. 60%

D. 45%

2831. The minimum diameter of a sewer is kept __________________?
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A. 20 cm

B. 25 cm

C. 15 cm

D. 10 cm

2832. The clarigesters are_________________?
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A. Circular septic tanks

B. Circular Imhoff double tanks with bottom hoppers

C. Rectangular septic tanks

D. Circular Imhoff double storey tanks without bottom hoppers
2833. The property of a fluid which enables it to resist tensile stress is known as________________?
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A. compressibility

B. cohesion

C. surface tension

D. viscosity.

E. adhesion

2834. Units of surface tension are_________________?
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A. energy/unit area

B. distance

C. both of the above

D. it has no units

E. none of the above

2835. Nitrogen cycle of sewage, is____________________?
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A. Liberation of nitrogen-formation of nitrates-formation of nitrites-liberation of ammonia

B. Liberation of nitrogen-liberation of ammonia-formation of nitrites- formation of nitrates

C. Liberation of ammonia-formation of nitrites-formation of nitrates-liberation of nitrogen

D. Formation of nitrates-formation of nitrites-liberation of nitrates-liberation of nitrates

2836. In sewers the velocity of flow should not be_________________?
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A. More than 20 m/sec

B. Less than the self-cleansing velocity

C. Less than 10 m/sec

D. More than the self-cleansing velocity

2837. The surface tension of mercury at normal temperature compared to that of water is____________________?
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A. same

B. less

C. more or less depending on size of glass tube

D. none of the above.

E. more
2838. In sewers the gas generally found, is_________________?
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A. Carbon dioxide (CO2)

B. Methane (CH4)

C. All the above

D. Hydrogen sulphide (H2S)

2839. The sewage treatment in septic tanks is due to__________________?
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A. None of these

B. Parasitic decomposition

C. Aerobic decomposition

D. Anaerobic decomposition
2840. Falling drops of water become spheres due to the property of ________________?
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A. cohesion

B. surface tension

C. adhesion

D. viscosity

E. compressibility

2841. Viscosity of water in comparison to mercury is ______________________?
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A. unpredictable.

B. same

C. higher

D. lower

E. higher/lower depending on temperature

2842. The volumetric change of the fluid caused by a resistance is known as_________________?
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A. cohesion

B. volumetric index

C. compressibility

D. adhesion

E. volumetric strain

2843. Choose the correct relationship_________________?
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A. dynamicviscosity = kinematicviscosity x density

B. specific gravity = gravity x density

C. gravity = specific gravity x density

D. kinematicviscosity = dynamicviscosity x density

E. hydrostaticforce = surface tension x gravity.

2844. Free surface of a liquid tends to contract to the smallest possible area due to force of _________________?
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A. friction

B. adhesion

C. cohesion

D. surface tension

E. viscosity

2845. Specific weight of sea water is more that of pure water because it contains ________________?
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A. all of the above

B. heavy water

C. dissolved air

D. suspended matter

E. dissolved salt

2846. Pick up the in-correct statement from the following?
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A. None of these

B. Inlets are generally provided in all sewers

C. Catch basins are generally provided in sewers for carrying drainage discharge

D. Manholes are provided in sewer pipes at suitable intervals

2847. In septic tanks__________________?
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A. The clear space between the baffle top and covering slab is about 7.5 cm

B. The baffles or tees are extended up to top level of scum

C. Free board of 0.3 m may be provided

D. All the above
2848. The sewer that unloads the sewage at the point of treatment is called_________________?
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A. House sewer

B. Outfall sewer

C. Branch sewer

D. Main sewer

2849. The sewer which collects the discharge from a collecting system and delivers it to a treatment plant, is known_____________________?
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A. House sewer

B. Branch sewer

C. Sewer outfall

D. Lateral sewer

2850. In R.C. sewer pipes, the percentage longitudinal reinforcement to the cross-sectional area of concrete is kept________________?
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A. 10

B. 2

C. 0.25

D. 5