civil engineering MCQs – Page 69

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 Review each marked answer and report any item that may be outdated or unclear.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
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