civil engineering MCQs – Page 128

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 Review each marked answer and report any item that may be outdated or unclear.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
2541. For treating the sewage of a large city, you will recommend_________________?
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A. A sedimentation tank and an activated sludge treatment plant

B. Sedimentation tanks with high rate trickling filters

C. A plant consisting of Imhoff tanks with low rate trickling filters

D. None of these

2542. Which of the following pumps in used to pump sewage solids with liquid sewage without clogging the pump is ?
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A. None of these

B. Pneumatic ejector

C. Reciprocating pump

D. Centrifugal pump
2543. What is defined as the reduction of the value of certain natural resources such as mines, oil, timber, quarries, etc. due to the gradual extraction of its contents ?
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A. Depreciation

B. Deflation

C. Depletion

D. Inflation

2544. What type of depreciation is due to the reduction in the demand for the function that the equipment or asset was designed to render ?
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A. Functional depreciation

B. Demand depreciation

C. Design depreciation

D. Physical depreciation

2545. The sewer which received discharge from two or more main sewers, is known as_______________?
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A. A main sewer

B. An outfall sewer

C. An intercepting sewer

D. A trunk sewer
2546. The width of a settling tank with 2 hour detention period for treating sewage 378 cu m per hour, is __________________?
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A. 5 m

B. 6.5 m

C. 5.5 m

D. 7 m
2547. In a sludge tank, the gas mainly produced, is_________________?
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A. Nitrogen

B. Hydrogen

C. Oxygen

D. Carbon dioxide
2548. Chlorination of water is done for the removal of____________________?
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A. Bacterias

B. Hardness

C. Suspended solids

D. Sediments

2549. The sewerage system consists of______________________?
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A. Lateral sewer

B. Branch sewer

C. All of these

D. House sewer

2550. Disposal to sewage in large cities, is done in__________________?
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A. Irrigation

B. Oxidation

C. Dilution

D. Purification

2551. The rational formula for peak drainage discharge, was evolved by_________________?
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A. Fruhling

B. Lloyd David

C. Kuichling

D. All of these
2552. Consider the following statements?
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A. Masonry in lime mortar has better resistance against rain penetration and is less liable to crack when compared to masonry in cement mortar.</strong>

B. Masonry in rich cement mortar though having good strength with high shrinkage is much liable for surface cracks.

C. Lime mortar possesses poor workability and poor water retentivity and also suffers high shrinkage.

D. ch of these statements are correct?

2553. For efficient working of a sewer, it must be ensured that _____________?
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A. Minimum velocity of 0.45 m/sec, is maintained at its minimum flow

B. A maximum velocity of 0.90 m/sec, is maintained at its maximum flow

C. Both A. and B.

D. Neither A. nor B.

2554. Pick up the correct statement from the following?
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A. An increase of phytoplankton increases the back scattering in the green region

B. An increase of phytoplankton absorbs the bule region rapidly

C. An increase of phytoplankton decreases the back scattering in the green region

D. Phytoplankton contains photosynthetically active pigment

2555. The sewer pipes__________________?
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A. All the above

B. Are designed for generating self-cleansing velocities at different discharge

C. Carry sewage as gravity conduits

D. Should resist the wear and tear caused due to abrasion

2556. The declining balance method is also known as ____________________?
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A. Double percentage method

B. Modified sinking fund method

C. Modified SYD method

D. Constant percentage method
2557. Pick up the correct statement from the following ?
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A. The minimum design velocity of sewer pipes is taken as 0.8 m/sec

B. The sewer pipes of sizes less than 0.4 m diameter are designed as running full at maximum discharge

C. The sewer pipes of sizes greater than 0.4 m diameter are designed as running 2/3rd or 3/4th full at maximum discharge

D. All the above
2558. Pick up the correct statement from the following?
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A. Water equivalent height of snow is the height of water column obtained by melting snow

B. The ratio of the up flux and down flux just above the snow surface, is called albedo

C. All of these

D. Spectral albedo of snow is calculated for the semi-infinite snow thickness

2559. For trunk sewers more than 1.25 m in diameter, the ratio of the maximum daily sewage flow to the average daily sewage flow is assumed________________?
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A. 2

B. 3

C. 2.5

D. 1.5
2560. What is another term for unit method for computing depletion ?
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A. Factor method

B. Percentage method

C. Sinking fund method

D. Initial cost method