civil engineering MCQs – Page 71

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 Review each marked answer and report any item that may be outdated or unclear.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
1401. The rate of BOD exerted at any time is_____________?
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A. directly proportional to BOD remain-ing

B. inversely proportional to BOD re-maining

C. directly proportional to BOD satisfied

D. inversely proportional to BOD satisfied

1402. Flow at constant rate through a tapering pipe is________________?
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A. uniform flow

B. non-uniform flow</strong>

C. correct answer is?

D. unsteady flow

E. steady flow
1403. The condition of equilibrium for any system of forces in a plane is____________________?
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A. that polygon of forces must close

B. that resultant couple must be zero

C. both (A) and (B)

D. none of the above

1404. The per capital consumption of a locality is affected by_________________?
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A. quality of water

B. distribution pressure</strong>

C. climatic conditions

D. correct answer is?

1405. At the instantaneous center, the velocity of the moving lamina at any instant is_________________?
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A. maximum

B. minimum

C. zero

D. varying

1406. For a given discharge, the efficiency of sedimentation tank can be increased by______________?
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A. decreasing the depth of tank

B. increasing the depth of tank

C. decreasing the surface area of tank

D. increasing the surface area of tank
1407. Facultative bacteria are able to work in________________?
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A. presence as well as in absence of oxygen

B. presence of oxygen only

C. presence of water

D. absence of oxygen only

1408. The maximum thickness of boundary layer in a pipe of radius r is____________________?
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A. r

B. 2r

C. 0

D. r/2

1409. Which of the following compounds is widely used for algae control ?
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A. copper sulphate

B. sodium chloride

C. calcium chloride

D. sodium sulphate

1410. One Newton is equivalent to_________________?
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A. 105 dyne

B. 981 dyne

C. 106 dyne

D. 107 dyne

1411. The ratio of unit of force in gravitational system to that in absolute system is__________________?
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A. 1

B. re g is acceleration due to gravity

C. none of the above

D. g

E. 1/g

1412. A pipe conveying sewage from plumbing system of a single building to common sewer or point of immediate disposal is called________________?
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A. submain sewer

B. house sewer

C. main sewer

D. lateral sewer

1413. As compared to shallow-wells, deep wells have______________?
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A. less discharge

B. more discharge

C. more depth

D. less depth

1414. The chemical most commonly used to increase speed of sedimentation of sewage is_______________?
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A. copper sulphate

B. sulphuric acid

C. sodium permanganate

D. lime
1415. A particle is dropped from a height of 3 m on a horizontal floor, which has a coefficient of restitution with the ball of 1/2. The height to which the ball will rebound after striking the floor is____________________?
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A. 1.5 m

B. 0.75 m

C. 0.5 m

D. 1.0 m

1416. The suitable method of forecasting population for a young and rapidly increasing city is_________________?
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A. incremental increase method

B. geometrical increase method

C. graphical method

D. arithmetical increase method

1417. Sewage treatment units are designed for_______________?
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A. maximum and minimum flow

B. minimum flow only

C. average flow only

D. maximum flow only

1418. A right circular cylinder open at the top is filled with liquid and rotated about its vertical axis at such a speed that half the liquid spills out, then the pressure intensity at the center of bottom is___________________?
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A. cannot be predicted from the given data

B. one-fourth its value when cylinder was full

C. zero

D. one-half its value when cylinder was full

1419. If the sewage contains grease and fatty oils, these are removed in_________________?
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A. skimming tanks

B. sedimentation tanks

C. grit chambers

D. detritus tanks

1420. In lime-soda process________________?
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A. lime reduces the non-carbonate hard-ness and soda-ash removes the carbonate hardness

B. lime reduces the carbonate hardness and soda-ash removes the non-carbonate hardness

C. only non-carbonate hardness is re-moved

D. only carbonate hardness is removed