civil engineering Mcqs
1301. The maximum value of the horizontal range for a projectile projected with a velocity of 98 m/sec is__________________?
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A. 1960 m

B. 980 m

C. 98 m

D. 490 m

1302. The type of valve which is provided to control the flow of water in the distribution system at street corners and where the pipe lines intersect is_______________?
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A. scour valve

B. safety valve

C. check valve

D. sluice valve
1303. Which of the following causes a decrease in per capita consumption ?
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A. use of metering system

B. better standard of living of the people

C. hotter climate

D. good quality of water

1304. The means of access for inspection and cleaning of sewer line is known as_______________?
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A. catch basin

B. drop manhole

C. manhole

D. inlet

1305. The type of valve which allows water to flow in one direction but prevents its flow in the reverse direction is____________________?
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A. reflux valve

B. air relief valve

C. sluice valve

D. pressure relief valve

1306. Chlorine demand of water is equal to________________?
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A. residual chlorine

B. applied chlorine

C. sum of applied and residual chlorine

D. difference of applied and residual chlorine
1307. The amount of residual chlorine left in public water supply for safety against pathogenic bacteria is about______________?
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A. 0.01 to 0.05 ppm

B. 0.05 to 0.5 ppm

C. 0.5 to 1.0 ppm

D. 1.0 to 5.0 ppm

1308. The effect of increasing diameter of sewer on the self cleansing velocity is_____________?
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A. fluctuating

B. to decrease it

C. nil

D. to increase it
1309. For a non-concurrent force system to be in equilibrium__________________?
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A. only the closure of force polygon is sufficient

B. only the closure of funicular polygon is sufficient

C. both force polygon and funicular polygon must close

D. none of the above

1310. The main disadvantage of cement concrete sewers is________________?
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A. difficulty in transportation due to heavy weight

B. difficulty in construction

C. less strength

D. less life

1311. The dimensions of Gravitational Universal constant G are______________?
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A. M-2L3T2

B. ML3T2

C. M-L2r2

D. M-L3r2
1312. The depression of water table in a well due to pumping will be maximum_______________?
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A. at a distance R/2 from the well

B. none of the above

C. re R is the radius of influence

D. at a distance R from the well

E. close to the well
1313. A projectile has maximum range of 40 m on a horizontal plane. If angle of projection is a and the time of flight is 1 second, then sin a must be about__________________?
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A. 5-Jan

B. 2-Jan

C. 1/4

D. 3-Jan

1314. The detention period in coagulation tanks is usually kept as_______________?
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A. 30 to 45 minutes

B. 2 to 6 days

C. 1 to 2 minutes

D. 2 to 6 hours
1315. A body is dropped from a height of 100 m and at the same time another body is projected vertically upward with a velocity of 10 m/sec. The two particles will____________________?
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A. meet after 5 sec

B. never meet

C. meet after 1 sec

D. meet after 10 sec
1316. Sewage treatment units are normally designed for______________?
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A. 40-50 years

B. 30-40 years

C. 5-10 years

D. 15-20 years
1317. The minimum and maximum diameters of sewers shall preferably be_________________?
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A. 60 cm and 300cm

B. 15 cm and 100 cm

C. 30 cm and 450 cm

D. 15 cm and 300 cm
1318. Composting and lagooning are the methods of_______________?
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A. sedimentation

B. filtration

C. sludge disposal

D. sludge digestion

1319. For hydro-dynamically smooth boundary, the friction coefficient for turbulent flow is_______________?
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A. dependent on relative roughness only

B. a function of Reynolds number and relative roughness

C. constant

D. dependent only on Reynolds number
1320. In facultative stabilization pond, the sewage is treated by________________?
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A. dual action of aerobic bacteria and anaerobic bacteria

B. aerobic bacteria only

C. sedimentation

D. algae only

1321. Pascal-second is the unit of______________?
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A. pressure

B. kinematic viscosity

C. surface tension

D. dynamic viscosity
1322. The detention period for oxidation ponds is usually kept as______________?
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A. 10 to 15 days

B. 24 hours

C. 3 months

D. 4-8 hours

1323. Standard EDTA (ethylene diamine tetra acetic aciD. solution is used to determine the_______________?
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A. hardness in water

B. dissolved oxygen in water

C. turbidity in water

D. residual chlorine in water

1324. The polluted water is one which_______________?
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A. is contaminated

B. is safe and suitable for drinking and domestic use

C. contains pathogenic bacteria

D. consists of undesirable substances rendering it unfit for drinking and domestic use
1325. Which of the following sewers is preferred for combined system of sewage ?
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A. circular sewer

B. none of the above

C. egg shaped sewer

D. rectangular sewer

1326. A pipe which is installed in the house drainage to preserve the water seal of traps is called______________?
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A. soil pipe

B. waste pipe

C. vent pipe

D. antisiphonage pipe
1327. The distribution mains are designed for________________?
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A. maximum hourly demand

B. maximum hourly demand on maximum day

C. average daily demand

D. maximum daily demand

1328. In case of an airfoil, the separation of flow occurs________________?
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A. at the extreme front of body

B. at the extreme rear of body

C. midway between rear and front of body

D. any where between rear and front of body depending upon Reynolds number

1329. The ratio of the speed of a rolling cylinder to the speed of sliding cylinder is_______________?
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A. equal to 1

B. less than 1

C. greater than 2

D. between 1 and 2

1330. A system of copianar forces is in equilibrium when___________________?
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A. force polygon closes

B. funicular polygon closes

C. both force polygon and funicular polygon close

D. all the forces are concurrent

1331. For a country like India, where rainfall is mainly confined to one season, the suitable sewerage system will be________________?
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A. separate system

B. partially separate system

C. combined system

D. partially combined system

1332. One Joule is equivalent to________________?
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A. 1 dyne metre

B. 1 kg wt metre

C. 9.81 Newton metre

D. 1 Newton metre
1333. A stone was thrown vertically upwards from the ground with a velocity of 50 m/sec. After 5 seconds another stone was thrown vertically upwards from the same place. If both the stones strike the ground at the same time, then the velocity with which the second stone was thrown should be (Assume g = 10 m/sec2)______________________?
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A. 40 m/sec

B. 50 m/sec

C. 15 m/sec

D. 25 m/sec
1334. Select the incorrect statement?
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A. Contraction is least at vena contracta

B. Coefficient of contraction is always less than one

C. Stream lines are parallel throughout the jet at vena contracta

D. The pressure intensity at vena contracta is atmospheric

1335. Scour valves are provided ______________?
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A. at every summit of rising mains

B. at street corners to control the flow of water

C. at every depression and dead ends to drain out the waste water that may collect there

D. at the foot of rising main along the slope to prevent back running of water

1336. The layout of distribution system in which water flows towards the outer periphery is_________________?
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A. dead end system

B. radial system

C. grid iron system

D. ring system

1337. If the dynamic viscosity of a fluid is 0.5 poise and specific gravity is 0.5, then the kinematic viscosity of that fluid in stokes is__________________?
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A. 1.0

B. 0.25

C. 0.5

D. none of the above

1338. The distance y from pipe boundary, at which the point velocity is equal to average velocity for turbulent flow, is________________?
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A. 0.707 R

B. 0.577 R

C. 0.223 R

D. 0.423 R

1339. The phenolic compounds in public water supply should not be more than_______________?
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A. 0.0001 ppm

B. 0.1 ppm

C. 0.01 ppm

D. 0.001 ppm
1340. A rope is wrapped twice around a rough pole with a coefficient of friction A . It is subjected to a force Fj at one end and a gradually increasing force F2 is applied at the other end till the rope just starts slip-ping. At this instant the ratio of F2 to Fi is_____________________?
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A. e4*

B. e2*

C. 1

D. e*72

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