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

1421. As compared to geometrical increase method of forecasting population, arithmetical increase method gives________________?
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A. higher value

B. lesser value

C. accurate value

D. same value

1422. Standard BOD is measured at________________?
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A. 25C- 3day

B. 20C 1day

C. 30C- 5day

D. 20C 5day
1423. The increase in meta centric height_________________?
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A. correct answer is?

B. decreases stability

C. increases stability

D. decreases comfort for passengers</strong>

E. increases comfort for passengers

1424. Select the correct statement?
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A. A pipe becomes smooth after using for long time

B. The absolute roughness of a pipe de-creases with time

C. The absolute roughness increases with time

D. The friction factor decreases with time

1425. The point in the immersed body through which the resultant pressure of the liquid may be taken to act is known as__________________?
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A. center of buoyancy

B. center of pressure

C. metacentre

D. center of gravity

1426. The ratio of 5 day BOD to ultimate BOD is about_______________?
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A. 3-Jan

B. 1

C. 2/3

D. 4-Mar

1427. A stone is thrown up a slope of inclination 60 to the horizontal. At what angle to the slope must the stone be thrown so as to land as far as possible from the point of projection ?
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A. 30

B. 45

C. 75

D. 15
1428. A funicular polygon cannot be made to pass through___________________?
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A. three specified points

B. one specified point

C. two specified points

D. more than three specified points
1429. If the total hardness of water is greater than its total alkalinity, the carbonate hardness will be equal to________________?
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A. total hardness total alkalinity

B. non carbonate hardness

C. total hardness

D. total alkalinity
1430. A hoop of radius 3 m weighs 100 kg. It rolls along a horizontal floor so that at its centre of mass has a speed of 200 mm/sec, . The work required to stop the hoop is______________?
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A. 4 J

B. 8 J

C. 6 J

D. 2 J

1431. The viscosity of a gas_______________?
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A. decreases with increase in temperature

B. is independent of pressure for very high pressure intensities

C. increases with increase in temperature

D. is independent of temperature

1432. For normal sludge, the value of sludge index for Indian conditions is________________?
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A. 0 to 50

B. 150 to 350

C. 350 to 500

D. 50 to 150

1433. A vertical rectangular plane surface is submerged in water such that its top and bottom surfaces are 1.5 m and 6.0 m res-pectively below the free surface. The position of center of pressure below the free surface will be at a distance of________________?
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A. 4.2m

B. 4.5m

C. 3.75 m

D. 4.0 m

1434. Laying of sewers is usually done with the help of________________?
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A. a plane table

B. a compass

C. a theodolite

D. sight rails and boning rods
1435. The pressure at the summit of a syphon is_______________?
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A. more than atmospheric

B. none of the above

C. equal to atmospheric

D. less than atmospheric
1436. The water carriage system of collection of waste product________________?
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A. requires treatment before disposal

B. all of the above

C. creates hygenic problem

D. is cheaper in initial cost than dry conservancy system

1437. Presence of tail water in a gravity dam_____________?
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A. correct answer is

B. decreases the principal stress

C. increases the principal stress

D. increases the shear stress

E. decreases the shear stress</strong>

1438. Two objects moving with uniform speeds are 5 m apart after 1 second when they move towards each other and are 1 m apart when they move in the same direction. The speeds of the objects are____________________?
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A. 3 m/sec and 2 m/sec

B. 3 m/sec and 3 m/sec

C. 4 m/sec and 6 m/sec

D. 2 m/sec and 2 m/sec

1439. A hyetograph is a graphical representation of___________________?
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A. cumulative rainfall and time

B. discharge and time

C. rainfall depth and time

D. rainfall intensity and time
1440. The ratio of kinetic energy and potential energy of a simple harmonic oscillator, at a displacement equal to half its amplitude is given by__________________?
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A. 1:02

B. 1:01

C. 2:01

D. 3:1
1441. The dimensions of centrifugal force are__________________?
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A. MLT1

B. M1 L2 T2

C. MLT2

D. ML-T2

1442. A ladder of weight w rests against a smooth vertical wall, and rests on rough horizontal ground, the coefficient of friction between the ladder and the ground being 1/4. The maximum angle of inclination of the ladder to the vertical, if a man of weight w is to walk to the top of it safely, is tan1 x, where x is___________________?
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A. 4

B. 4-Jan

C. 3

D. 1/3
1443. Hydrodynamic pressure due to earthquake acts at a height of_________________?
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A. 4H737t below the water surface where H is the depth of water

B. 4H/371 above the base

C. 3H747t below the water surface

D. 3H/47I above the base

1444. Which of the following devices is used to transfer the wagons or locomotives to and from parallel tracks without any necessity of shunting ?
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A. turntable

B. triangle

C. scotch block

D. traverser
1445. The side slope of embankments for a railway track is generally taken as______________?
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A. 1:02

B. 1:01

C. 2:1

D. 1.5:1

1446. When the upstream face of a gravity dam is vertical, then the intensity of water pressure at the water surface and at the base respectively will be_______________?
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A. wH2/2and wH2/3

B. 0 and wH212

C. wH and 0

D. OandwII
1447. The maximum permissible eccentricity for no tension at the base of a gravity dam is__________________?
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A. B/3

B. B/6

C. B/4

D. B/2

1448. In a lifting machine with efficiency 60%, an effort of 200 N is required to raise a load of 6 kN. The velocity ratio of the machine is_____________________?
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A. 30

B. 50

C. 60

D. 80

1449. When the reservoir is full, the maximum compressive force in a gravity dam is produced______________?
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A. at the toe

B. at centre of base

C. at the heel

D. within the middle third of base

1450. If there are two canals taking off from each flank of a river, then there will be____________________?
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A. two divide walls and two undersluices

B. one divide wall and one undersluice

C. one divide wall and two undersluices

D. two divide walls and one undersluice