civil engineering MCQs – Page 68

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 Review each marked answer and report any item that may be outdated or unclear.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
1341. Ground water is usually free from________________?
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A. suspended impurities

B. dissolved impurities

C. both suspended and dissolved impurities

D. none of the above

1342. When a circular wheel rolls on a straight track, then the shape of body centrode and space centrode respectively are________________?
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A. straight line and circle

B. circle and straight line

C. circle and parabola

D. straight line and parabola

1343. A car goes round a curve of radius 100 m at 25 m/sec. The angle to the horizontal at which the road must be banked to prevent sideways friction on the car wheels is tan1 x, where x is (Assume g = 10 m/sec2)_____________________?
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A. 8-Mar

B. 2-Jan

C. 5/8

D. 5-Sep

1344. If the coliform bacteria is present in a sample of water, then the coliform test to be conducted is_____________?
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A. confirmed coliform test

B. correct answer is ?

C. presumptive coliform test

D. completed coliform test</strong>

1345. Due to each end contraction, the discharge of rectangular sharp crested weir is reduced by________________?
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A. 10%

B. 20%

C. 15%

D. 5%
1346. The relative stability of a sewage sample, whose dissolved oxygen is same as the total oxygen required to satisfy BOD, is______________?
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A. 1

B. zero

C. infinite

D. 100
1347. Percentage of bacterial load that can be removed from water by the process of plain sedimentation is about_______________?
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A. 10 to 25

B. 75

C. 50

D. 100

1348. Minimum pull in a suspended cable with supports at two ends is equal to____________________?
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A. half the weight of the cable

B. horizontal thrust

C. resultant of horizontal thrust and support reaction

D. support reactions

1349. The percentage of chlorine in fresh bleaching powder is about________________?
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A. 10 to 15

B. 30 to 35

C. 40 to 50

D. 20 to 25

1350. The design discharge for the combined sewer system shall be taken as________________?
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A. rainfall + 6 DWF

B. rainfall + DWF

C. rainfall + 2 DWF

D. equal to rainfall

1351. When a liquid rotates at a constant angular velocity about a vertical axis as a rigid body, the pressure intensity varies________________?
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A. inversely as the radial distance

B. linearly with radial distance

C. as the square of the radial distance

D. inversely as the square of the radial distance

1352. The time of concentration is defined as_______________?
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A. sum of (A) and (B)

B. difference of (A) and (B)

C. the time required for flow of water in sewer to the point under consideration

D. the time taken by rainfall water to run from most distant point of water shed to the inlet of sewer

1353. The maximum efficiency of BOD removal is achieved in______________?
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A. trickling filters

B. oxidation ditch

C. oxidation pond

D. aerated lagoons

1354. The amount of coagulant needed for coagulation of water increases with_______________?
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A. correct answer is?

B. increase in turbidity of water

C. decrease in turbidity of water

D. decrease in temperature of water</strong>

E. increase in temperature of water

1355. Cleaning is done by________________?
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A. back washing in rapid sand filters</strong>

B. correct answer is

C. scraping and removal in filters rapid sand

D. scraping and removal in filters slow sand

E. back washing in slow sand filters

1356. The dimensions of power are_______________?
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A. ML2T2

B. MLr2

C. ML-T*

D. MLT3
1357. In water treatment, rapid gravity filters are adopted to remove_______________?
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A. bacteria and colloidal solids

B. dissolved solids and dissolved gases

C. floating solids and dissolved inorganic solids

D. dissolved organic substances

1358. The unit of kinematic viscosity is_______________?
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A. gm/cm-sec2

B. cm2/sec

C. dyne-sec/cm2

D. gm/cm2-sec

1359. Equation of continuity is based on the principle of conservation of_________________?
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A. none of the above

B. energy

C. momentum

D. mass
1360. Average rate of water consumption perhead per day as per Indian Standard is______________?
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A. 100 litres

B. 135 litres

C. 200 litres

D. 165 litres