civil engineering MCQs – Page 135

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 Review each marked answer and report any item that may be outdated or unclear.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
2681. A well oxidized sewage contains nitrogen mainly as___________________?
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A. Nitrites

B. Nitrates

C. None of these

D. Free ammonia

2682. Under the depletion allowance method in computing depreciation, the depletion charge is equal to either ________________ which ever is smaller ?
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A. 50% of the fixed percentage of gross income or 50% of the net taxable income

B. 50% of the fixed percentage of gross income or the net taxable income

C. Fixed percentage of gross income or 50% of the net taxable income

D. Fixed percentage of gross income or the net taxable income

2683. For non-scouring velocity 5 m/sec, the type of sewers generally preferred to, is____________________?
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A. Cement concrete sewers

B. Glazed bricks sewers

C. Stone ware sewers

D. Cast iron sewers

2684. Pick up the correct statement from the following?
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A. 4 ppm of Dissolved Oxygen (D.O.) is ensured before discharging the treated sewage in river

B. Solubility of oxygen in sewage is 95% of that of distilled water

C. All the above

D. Hydrogen sulphide gas in excess, may cause corrosion of concrete sewers

2685. The sewer which resists sulphide corrosion, is____________________?
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A. Cast iron sewer

B. R.C.C. sewer

C. Lead sewer

D. Brick sewer

2686. What is defined as the reduction or fall of the value of an asset due to constant use and passage of time ?
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A. Inflation

B. Depletion

C. Depreciation

D. Deflation

2687. The density of population over 40 hectares is 250/hectare. If water supply demand per day is 200 litres and sewage discharge is 80% of water supply, the sewage flow in sewers of separate system, is_____________________?
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A. 0.0556 cumec

B. 0.05556 cumec

C. 0.05552 cumec

D. 0.05554 cumec

2688. What refers to the claim of anyone to ownership ?
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A. Equity

B. Assets

C. Liability

D. Proprietorship

2689. Lead caulked joints are used for laying____________________?
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A. C.I. pipes

B. G.I. pipes

C. Stone ware pipes

D. Earthenware pipes
2690. Depletion of ozone layer in the outer atmosphere may cause___________________ ?
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A. Lung cancer

B. Bronchitis

C. Skin cancer

D. Heart disorder

2691. Sewer ventilating columns are generally placed at_______________?
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A. Upper ends of branch sewers

B. All the above

C. Distances 150 m to 300 m

D. Every change in the size of sewers

2692. In circular sewers if depth of flow is 0.2 times the full depth, the nominal gradient,______________?
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A. Is trebled

B. Is doubled

C. Is only provided

D. Is not enough

2693. The amount of oxygen consumed by the aerobic bacterias which cause the aerobic biological decomposition of sewage, is known_________________?
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A. Dissolved Oxygen (D.O.)

B. Chemical Oxygen Demand (C.O.D.)

C. None of these

D. Bio-Chemical Oxygen Demand (B.O.D.)

2694. 4-61. Kinematic viscosity is equal to________________?
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A. dynamicviscosity x density

B. same as dynamic viscosity

C. 1/dynamicviscosity x density

D. dynamic viscosity/density

E. density/dynamic viscosity

2695. The pressure at a point in a fluid will not be same in all the directions when the fluid is________________?
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A. viscous and static

B. moving

C. viscous

D. viscous and moving

E. inviscous and moving

2696. Before discharging the foul sewage into rivers, it is generally treated by_____________________?
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A. All the above

B. Sedimentation

C. Oxidation

D. Screening

2697. If the depletion of oxygen is found to be 2.5 mg/litre after incubating 2.5 ml of sewage diluted to 250 ml for 5 days at 20C, B.O.D. of the sewage is_________________?
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A. 100 mg/l

B. 250 mg/l

C. 50 mg/l

D. 150 mg/l

2698. In case of sewer lines_________________?
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A. Water test is carried out to check water tightness of the joints

B. Obstruction test is carried out with the help of smooth ball of diameter 13 mm

C. All the above

D. Test for straightness is carried out with the help of a lamp and mirror

2699. If no resistance is encountered by displacement, such a substance is known as___________________?
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A. perfect solid

B. ideal fluid

C. gas

D. fluid

E. water

2700. In primary sedimentation, the 0.2 mm inorganic solids get separated if specific gravity is_________________?
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A. 2.25

B. 2.55

C. 2.65

D. 2.5