civil engineering MCQs – Page 139

Practise multiple-choice questions from civil engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

civil engineering Mcqs
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