civil engineering Mcqs
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

1361. Turbidity is measured on_______________?
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A. platinum cobalt scale

B. standard silica scale

C. standard cobalt scale

D. standard platinum scale

1362. A particle of mass 2 kg executes simple harmonic motion of frequency 6/71 Hz and amplitude 0.25 m. Its maximum kinetic energy is___________________?
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A. 4.5 J

B. 18.0 J

C. 12.0 J

D. 9.0 J
1363. Sewerage system is usually designed for_________________?
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A. 75 years

B. 10 years

C. 25 years

D. 50 years

1364. Assertion A: Slow sand filters are more efficient in removal of bacteria than rapid sand filters. Reason R : The sand used in slow sand filters is finer than that in rapid sand filters. Select your answer based on the coding system given below?
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A. Both A and R are true and R is the correct explanation of A

B. Both A and R are true but R is not the correct explanation of A

C. A is true but R is false

D. A is false but R is true

1365. Air binding phenomena in rapid sand filters occur due to_________________?
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A. mud ball formation

B. excessive negative head

C. higher turbidity in the effluent

D. low temperature

1366. Alkalinity in water is expressed as milli-grams per litre in terms of equivalent_______________?
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A. calcium carbonate

B. calcium hydroxide

C. sodium carbonate

D. magnesium carbonate

1367. The suitable layout of distribution system for a city with roads of rectangular pattern is______________?
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A. grid iron system

B. dead end system

C. ring system

D. radial system

1368. Which of the following values of pH represents a stronger acid?
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A. 2

B. 7

C. 10

D. 5

1369. The theoretical value of coefficient of contraction of a sharp edged orifice is_______________?
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A. 1

B. 0.85

C. 0.611

D. 0.98

1370. The design discharge for the separate sewer system shall be taken as_____________?
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A. equal to dry weather flow (DWF)

B. 6xDWF

C. 2xDWF

D. 3 x DWF

1371. The characteristics of fresh and septic sewage respectively are____________________?
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A. acidic and alkaline

B. alkaline and acidic

C. both acidic

D. both alkaline

1372. The gas from sludge digestion tank is mainly composed of __________________?
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A. nitrogen

B. hydrogen sulphide

C. methane

D. carbon dioxide

1373. As compared to higher pH values, the contact period required for efficient chlorination at lower pH values is___________________?
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A. smaller

B. same

C. none of the above

D. larger

1374. The correct relation between theoretical oxygen demand (TOD), Biochemical oxygen demand (BOD) and Chemical oxygen demand (COD) is given by_______________?
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A. COD>BOD>TOD

B. BOD>COD>TOD

C. TOD>COD>BOD

D. TOD>BOD>COD

1375. The main disadvantage of oxidation pond is that________________?
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A. maintenance and operation cost are high

B. none of the above

C. BOD removal is very low

D. large area is required for construction
1376. A flywheel of moment of inertia 20 kg-m is acted upon by a tangential force of 5 N at 2 m from its axis, for 3 seconds. The increase in angular velocity in radian persecond is__________________?
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A. 3

B. 2

C. 2-Jan

D. 3/2
1377. The speed of a pressure wave through a pipe depends upon________________?
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A. the length of pipe

B. the viscosity of fluid

C. the bulk modulus for the fluid

D. the original head

1378. For a sphere of radius 15 cm moving with a uniform velocity of 2 m/sec through a liquid of specific gravity 0.9 and dynamic viscosity 0.8 poise, the Reynolds number will be_________________?
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A. 675

B. 300

C. 337.5

D. 600

1379. Septic tank is a______________?
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A. digestion tank

B. correct answer is?

C. settling tank

D. aeration tank</strong>

1380. In a lifting machine a weight of 5 kN is lifted through 200 mm by an effort of 0.1 kN moving through 15 m. The mechanical advantage and velocity ratio of the machine are respectively_____________________?
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A. 50 and 50

B. 75 and 50

C. 75 and 75

D. 50 and 75
1381. A solid sphere of mass M and radius R rolls down a plane inclined at 0 with the horizontal. The acceleration of sphere is_______________?
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A. (3/7) g sin 0

B. (2/5) g sin 0

C. (1/3) g sin0

D. (5/7) g sin0
1382. The slope of sewer shall be__________________?
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A. given in the direction opposite to natural slope of ground

B. zero

C. steeper than 1 in 20

D. given in the direction of natural slope of ground
1383. The losses are more in_________________?
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A. turbulent flow

B. laminar flow

C. critical flow

D. transition flow

1384. The graphical method of determining the forces in the members of a truss is based on________________?
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A. method of joint

B. method of section

C. none of the two methods

D. either method

1385. The process of lagooning is primarily a means of________________?
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A. reducing the excessive flow in sewers

B. increasing flow of sewage through imhoff tanks

C. disposing of sludge

D. increasing the capacity of storage re-servoirs

1386. Coefficient of velocity for Bordas mouth piece running full is________________?
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A. 0.855

B. 0.707

C. 0.611

D. 1

1387. If a flywheel increases its speed from 10 rpm to 20 rpm in 10 seconds, then its angular acceleration is_____________________?
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A. rad/sec 10

B. rad/sec 30

C. none of the above

D. rad/sec 20

1388. The suitable system of sanitation for area of distributed rainfall throughout the year with less intensity is_________________?
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A. partially combined system

B. partially separate system

C. combined system

D. separate system

1389. On standard silica scale, the turbidity in drinking water should be limited to_______________?
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A. 20 ppm

B. 30 ppm

C. 50 ppm

D. 10 ppm
1390. The devices which are installed for drawing water from the sources are called______________?
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A. filters

B. intakes

C. aquiclude

D. aquifers

1391. For a given velocity of a projectile, the range is maximum when the angle of projection is___________________?
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A. 45

B. 90

C. 0

D. 30

1392. Sludge volume index is defined as the ratio of_______________?
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A. percentage of total solids by weight to percentage of sludge by volume

B. percentage of sludge by volume to percentage of suspended solids by weight

C. percentage of suspended solids by weight to percentage of sludge by volume

D. percentage of sludge by volume to percentage of total solids by weight

1393. If the weight of a body immersed in a fluid exceeds the buoyant force, then the body will________________?
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A. rise until its weight equals the buoyant force

B. tend to move downward and it may finally sink

C. float

D. none of the above

1394. The velocity of flow does not depend on_______________?
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A. length of sewer

B. roughness of sewer

C. hydraulic mean depth of sewer

D. grade of sewer

1395. A quantity measured in the C.G.S system of units has dimensions M2L3 T3/2. What numerical factor would be required to convert the quantity to SI units ?
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A. 1/10000

B. 100

C. 1

D. 1/100

1396. The self cleansing velocity for all sewers in India is usually_________________?
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A. 1.5 m/sec to 2.0 m/sec

B. 3.0 m/sec to 3.5 m/sec

C. 1.0 m/sec to 1.2 m/sec

D. less than 1.0 m/sec

1397. The pipe which is used to carry the discharge from sanitary fittings like bath rooms, kitchens etc. is called_______________?
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A. antisiphonage pipe

B. waste pipe

C. vent pipe

D. soil pipe

1398. The suitable layout of a distribution system for irregularly growing town is_______________?
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A. grid iron system

B. radial system

C. ring system

D. dead end system
1399. The suitable method for disinfection of swimming pool water is________________?
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A. chlorination

B. ultra violet rays treatment

C. by using potassium permanganate

D. lime treatment

1400. The percentage of filtered water, which is used for backwashing in rapid sand filters, is about______________?
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A. 0.2 to 0.4

B. 0.4 to 1.0

C. 2 to 4

D. 5 to 7