civil engineering Mcqs
2751. The grit and silt of the grit chambers, may not be used for_________________?
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A. Raising low lying areas by dumping

B. Concreting

C. Both A. and B.

D. Neither A. nor B

2752. The water carried sewerage system removes__________________?
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A. Storm sewage

B. All the above

C. Industrial sewage

D. Domestic sewage

2753. Pick up the correct statement from the following?
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A. pH value indicates acidity and alkalinity of sewage

B. In alkaline sewage, the pH value is more than 7

C. In acidic sewage, the pH value is less than 7

D. All the above
2754. In sewage having fully oxidised organic matter, the nitrogen exists in the form of________________?
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A. Nitrites

B. Free ammonia

C. Aluminoid nitrogen

D. Nitrates
2755. A perfect gas_________________?
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A. is incompressible

B. has constant viscosity

C. is of theoretical interest

D. none of the above

E. has zero viscosity

2756. The sewers___________________?
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A. Must flow under gravity to full

B. Must be laid at least 2 to 3 m deep to collect /water from the basements

C. All the above

D. Must be of adequate size to avoid over flow

2757. 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__________________?
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A. decrease

B. remain same

C. increase/decrease depending on depth of immersion

D. increase

E. unpredictable

2758. The stone ware sewers_________________?
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A. Are used for carrying sewage and drainage from houses

B. All the above

C. After casting are dried and burnt at temperature 150C, 700C and 1200C

D. Are manufactured from clays and shale

2759. A balloon lifting in air follows the following principle_________________?
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A. all of the above

B. law of gravitation

C. principle of buoyancy

D. continuity equation

E. Archimedes principle

2760. 3.0 ml of raw sewage is diluted to 300 ml. The D.O. concentration of the diluted sample at the beginning of the test was 8 mg/l. After 5 day-incubation at 20C, the D.O. concentration was 5 mg/l. The BOD of raw sewerage is______________________?
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A. 400 mg/l

B. 300 mg/l

C. 100 mg/l

D. 200 mg/l

2761. A sewer pipe contains 1 mm sand particles of specific gravity 2.65 and 5 mm organic particles of specific gravity 1.2, the minimum velocity required for removing the sewerage, is_____________________?
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A. 0.35 m/sec

B. 0.45 m/sec

C. 0.40 m/sec

D. 0.30 m/sec

2762. A one dimensional flow is one which___________________?
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A. is steady uniform flow

B. involves zero transverse component of flow

C. takes place in straight lines

D. is uniform flow

E. takes place in one dimension

2763. The small sewers are cleaned by____________________?
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A. None of these

B. Cane rodding

C. Flushing

D. Wooden pills

2764. Dry water flow in a combined sewer, is______________________?
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A. Domestic sewage

B. Storm water

C. Inclusive of domestic and industrial sewage but excludes storm water

D. Industrial sewage

2765. The increase of temperature results in_________________?
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A. decrease in viscosity of gas

B. A. and D. above

C. decrease in viscosity of liquid

D. increase in viscosity of liquid

E. increase in viscosity of gas

2766. Property of a fluid by which molecules of different kinds of fluids are attracted to each other is called________________?
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A. adhesion

B. viscosity

C. surface tension

D. compressibility

E. cohesion

2767. In a fully mechanised composting plant, involves________________?
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A. Mechanized segregation

B. All of these

C. Mechanized receipt

D. Mechanized pulverising of refuse

2768. A manhole is classified as shallow if its depth is between_________________?
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A. 0.9 to 1.20 m

B. 0.5 to 0.7 m

C. 0.7 to 0.9 m

D. 0.4 to 0.5 m

2769. The gas evolved in sewers is________________?
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A. All of these

B. Methane

C. Carbondioxide

D. Hydrogen sulphide

2770. 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____________________?
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A. 30 minutes

B. 2 hours

C. 1 hour

D. 1 hour and 30 minutes

2771. The resultant upward pressure of a fluid on a floating body is equal to the weight of the fluid displaced by the body. This definition is according to____________________?
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A. Equilibrium of a floating body

B. Buoyancy

C. Archimedes principle

D. Metacentric principle

E. Bernoullis theorem

2772. The settlement of a particle in sedimentation tank, is affected by_____________________?
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A. Size and shape of solid

B. Viscosity of water

C. Velocity of flow

D. All the above
2773. Assertion A.: A free board of 0.3 m is provided above the top sewage line in septic tanks. Reason (R): It helps to accommodate the scum in the septic tank_________________?
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A. Both A and R is true and R is the correct explanation of A

B. Both A and R is 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

2774. If the over land flow from the critical point to the drain is 8 km and the difference in level is 12.4 m, the inlet time is________________?
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A. 5 hours

B. 3 hours

C. 2 hours

D. 4 hours
2775. Pick up the incorrect statement from the following for allowing workers to enter sewers_______________?
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A. Warning signals should be erected

B. The particular manhole and one manhole on upstream and one manhole on downstream should remain open for 30 minutes

C. Proper tests for the presence of poisonous gases must be carried out

D. The men entering the manhole should be advised to smoke in the sewer
2776. A drop manhole is provided if__________________?
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A. A branch sewer joins the main sewer at higher level

B. A sewer drops from a height

C. A lamp is inserted to check obstruction

D. None of these

2777. When drainage to sewage ratio is 20, the peak dry weather flow is_______________?
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A. Slightly less than 5% of the design discharge

B. 20% of the design discharge

C. None of these

D. Slightly more than 5% of the design discharge

2778. The gradient of sewers depends upon_________________?
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A. Diameter of the sewer

B. Velocity of flow

C. All the above

D. Discharge

2779. Pick up the incorrect size of stone ware sewers_________________?
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A. None of these

B. 82.5 cm

C. 67.5 cm

D. 52.5 cm

2780. The normal values of over flow rates for sedimentation tanks using coagulant, ranges between__________________?
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A. 40,000 to 50,000 litres/sqm/day

B. 25,000 to 35,000 litres/sqm/day

C. 50,000 to 60,000 litres/sqm/day

D. 80,000 to 100,000 litres/sqm/day

2781. For estimating the peak run off the rational formula Q = 0.0278 KpA was evolved by______________?
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A. Frubling

B. All the above

C. Kinchling

D. Lloyd Davis

2782. For design of sewers, percentage of sewage discharge is assumed_____________________?
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A. 70 to 75%

B. 75 to 80%

C. 85%

D. 65 to 70%

2783. The gas which may cause explosion in sewers, is_________________?
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A. Ammonia

B. Carbon monoxide

C. Carbondioxide

D. Methane
2784. In a sludge digestion tank if the moisture content of sludge V1 litres is reduced from p1 % to p2 % the volume V2 is____________________?
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A. [(100 + P2)/(100 P1)] V1

B. [(100 P1)/(100 P2)] V1

C. [(100 + P1)/(100 P2)] V1

D. [(100 P1)/(100 + P2)] V1

2785. The non-clog pump which permits solid matter to pass out with the liquid sewage, is________________?
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A. None of these

B. Reciprocating pump

C. Centrifugal pump

D. Pneumatic ejector

2786. The property of fluid by virtue of which it offers resistance to shear is called____________________?
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A. surface tension

B. viscosity

C. cohesion

D. adhesion

E. all of the above

2787. For the survival of fish in a river stream, the minimum dissolved oxygen is prescribed________________?
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A. 4 ppm

B. 10 ppm

C. 5 ppm

D. 3 ppm

2788. The resultant upward pressure of the fluid on an immersed body is called__________________?
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A. buoyancy

B. none of above is correct

C. all the above are correct

D. upthrust

E. center of pressure

2789. The maximum depth of sedimentation tanks, is kept__________________?
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A. 3 m

B. 3.5 m

C. 4 m

D. 4.5 m

2790. Mercury does not wet glass. This is due to property of liquid known as_________________?
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A. cohesion

B. surface tension

C. adhesion

D. viscosity

E. compressibility

2791. Flocculated particles do not change their___________________?
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A. Size

B. Shape

C. Weight

D. None of these
2792. If 2% solution of a sewage sample is incubated for 5 days at 20C and depletion of oxygen was found to be 5 ppm, B.O.D. of the sewage is____________________?
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A. 225 ppm

B. 250 ppm

C. None of these

D. 200 ppm

2793. The spacing of bars of perforations of fine screens used for the treatment of sewage, is_______________?
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A. 3 to 5 mm

B. 8 to 10 mm

C. 2 to 3 mm

D. 5 to 8 mm

2794. Which one of the following resists hydrogen sulphide corrosion ?
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A. Glazed stone wares

B. R.C.C.

C. Glazed ware

D. Asbestos cement

2795. 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__________________?
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A. 16 m

B. 24 m

C. 20 m

D. 30 m

2796. In SI units the power of sound is represented in __________________?
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A. Newtons

B. Joules

C. Kgs

D. Watts
2797. You are asked to design sewer pipes of diameters 0.4 m to 0.9 m at maximum flow, you will assume the sewer flow running at___________________?
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A. Two third full

B. Three fourth full

C. Half full

D. Full depth

2798. When the flow parameters at any given instant remain same at every point, then flow is said to be____________________?
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A. quasi static

B. steady state

C. static.

D. uniform

E. laminar

2799. The ratio of absolute viscosity to mass density is known as____________________?
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A. coefficient of viscosity

B. specific viscosity

C. viscosity index

D. coefficient of compressibility

E. kinematic viscosity
2800. The resultant upward pressure of the fluid on an immersed body is called_________________?
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A. none of above is correct

B. upthrust

C. center of pressure

D. all the above are correct

E. buoyancy