civil engineering MCQs – Page 138

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 Review each marked answer and report any item that may be outdated or unclear.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
2741. Pick up the correct statement from the following?
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A. All the above

B. Inlets are provided on the road surface at the lowest point for draining rain water

C. Inlets are generally provided at an interval of 30 m to 60 m along straight roads

D. Inlets having horizontal openings, are called horizontal inlets

2742. Pick up the correct statement from the following?
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A. Bangalore method of composting involves decomposing under anaerobic conditions

B. Indore method of composting involves decomposition under aerobic conditions

C. all of these

D. Fully stabilised refuse by the Bangalore method of compositing is a powdery mass called humus

2743. 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 ?
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A. the metal piece will simply float over the mercury

B. none of the above

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

E. the metal piece will be immersed in mercury by half

2744. Kjeldahl nitrogen is a mixture of___________________?
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A. Nitrogen and organic nitrogen

B. All the above

C. Organic nitrogen and ammonia

D. Ammonia and nitrogen

2745. If the diameter of a sewer is 150 mm, the gradient required for generating self cleansing velocity, is________________?
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A. 1 in 100

B. 1 in 60

C. 1 in 120

D. None of these

2746. If the depth of flow in a circular sewer is 1/4th of its diameter D, the wetted perimeter is______________?
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A. D

B. /3

C. /2

D. /4

2747. To test chemical oxygen demand (C.O.D.) of sewage, organic matter is oxidised by potassium dichromate in the presence of_______________?
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A. Nitric acid

B. Hydrochloric acid

C. Citric acid

D. Sulphuric acid
2748. Kinematic viscosity is dependent upon________________?
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A. pressure

B. distance

C. level

D. flow

E. density
2749. During purification process of sewage the gas given off, is________________?
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A. All the above

B. Carbon dioxide

C. Ammonia

D. Hydrogen

2750. If is the rugosity coefficient, is the bed slope of sewer, the velocity of flow in m/sec may be obtained by the formula V = (1/n) r2/3 s1/2 evolved by_________________?
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A. Kutter

B. Bazin

C. Chezy

D. Manning
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