civil engineering MCQs – Page 223

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 Review each marked answer and report any item that may be outdated or unclear.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
4441. The velocity of flow does not depend on_______________?
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A. grade of sewer

B. hydraulic mean depth of sewer

C. roughness of sewer

D. length of sewer
4442. Disinfection of water results in______________?
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A. removal of turbidity

B. removal of hardness

C. complete sterilisation

D. killing of disease bacteria
4443. A pipe which is installed in the house drainage to preserve the water seal of traps is called______________?
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A. antisiphonage pipe

B. soil pipe

C. waste pipe

D. vent pipe

4444. Sewage treatment units are normally designed for______________?
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A. 5-10 years

B. 15-20 years

C. 30-40 years

D. 40-50 years

4445. For the same solid content, if the quantity of sludge with moisture content of 98% is X, then the quantity of sludge with moisture content of 96% will be__________________?
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A. 2X

B. X/2

C. X/4

D. X

4446. 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. completed coliform test</strong>

C. correct answer is ?

D. presumptive coliform test
4447. The rate of Alteration of pressure filters is_________________?
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A. greater than that of rapid sand filters

B. in between the filtration rate of slow sand filters and rapid sand filters

C. less than that of slow sand filters

D. equal to that of slow sand filters

4448. Standard EDTA (ethylene diamine tetra acetic aciD. solution is used to determine the_______________?
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A. hardness in water

B. residual chlorine in water

C. turbidity in water

D. dissolved oxygen in water

4449. 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

4450. The detention period in coagulation tanks is usually kept as_______________?
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A. 2 to 6 hours

B. 1 to 2 minutes

C. 2 to 6 days

D. 30 to 45 minutes

4451. Most suitable section of sewer in separate sewage system is________________?
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A. rectangular section

B. circular section

C. modified egg shaped section

D. standard form of egg shaped sewer

4452. The gas from sludge digestion tank is mainly composed of __________________?
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A. nitrogen

B. methane

C. hydrogen sulphide

D. carbon dioxide

4453. 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

4454. Scour valves are provided ______________?
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A. at the foot of rising main along the slope to prevent back running of water

B. at every summit of rising mains

C. at street corners to control the flow of water

D. at every depression and dead ends to drain out the waste water that may collect there
4455. The phenolic compounds in public water supply should not be more than_______________?
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A. 0.1 ppm

B. 0.01 ppm

C. 0.001 ppm

D. 0.0001 ppm

4456. 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. less than 1.0 m/sec

D. 1.0 m/sec to 1.2 m/sec
4457. The settling velocity of a particle in a sedimentation tank increases if______________?
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A. the depth of tank is decreased

B. particle size is decreased

C. none of the above

D. the surface area of tank is increased

4458. The minimum dissolved oxygen which should always be present in water in order to save the aquatic life is______________?
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A. 4 ppm

B. 10 ppm

C. 40 ppm

D. 1 ppm

4459. For a given discharge, the efficiency of sedimentation tank can be increased by______________?
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A. increasing the depth of tank

B. increasing the surface area of tank

C. decreasing the surface area of tank

D. decreasing the depth of tank

4460. Period of cleaning of slow sand filters is about________________?
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A. 2-3 months

B. 24 48 hours

C. 1-2 year

D. 10-12 days