Civil Engineering MCQs

Page No. 21

Pick up the correct statement from the following?


a Anaerobic bacteria flourish in the absence of oxygen

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bAerobic bacteria flourish in the presence of oxygen

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c Facultative bacteria flourish with or without oxygen

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dAll the above

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View Answer All the above

Pick up the correct statement from the following?


aThe circular section of sewers provides maximum hydraulic mean depth

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bThe circular sewers are provided for separate sewerage system

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cThe circular sewers work efficiently if the sections run at least half full

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d All the above

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View Answer All the above

Pick up the correct statement from the following?


a Inlets are provided on the road surface at the lowest point for draining rain water

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b Inlets are generally provided at an interval of 30 m to 60 m along straight roads

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c Inlets having horizontal openings, are called horizontal inlets

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d All the above

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View Answer All the above

Pick up the correct statement from the following?


aIndore method of composting involves decomposition under aerobic conditions

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bBangalore method of composting involves decomposing under anaerobic conditions

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cFully stabilised refuse by the Bangalore method of compositing is a powdery mass called humus

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d all of these

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View Answer all of these

Pick up the correct statement from the following?


a pH value indicates acidity and alkalinity of sewage

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b In acidic sewage, the pH value is less than 7

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cIn alkaline sewage, the pH value is more than 7

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d All the above

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View Answer All the above

Pick up the correct statement from the following?


aThe boning rod is used for checking the levels of the sewer inverts

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bManhole covers are made circular for the convenience of the cleaning st

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cA manhole is classified as shallow manhole if its depth is less than 0.9 m

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d All the above

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View Answer All the above

Pick up the correct statement from the following ?


aTurbidity is more in strong sewage

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bThe black colour indicates septic sewage

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cThe sewage omits offensive odours after four hours

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d All the above

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View Answer All the above

The layers of vegetable wastes and night soil alternatively piled above the ground to form a mound, is called_______________?


aA heap

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bPlateau

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cWindrow

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d None of these

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View Answer None of these

The gas which may cause explosion in sewers, is_________________?


aCarbondioxide

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bMethane

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cAmmonia

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dCarbon monoxide

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View Answer Methane

The discharge per unit plan area of a sedimentation tank, is generally called________________?


aOver flow rate

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bSurface loading

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cOver flow velocity

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dAll the above

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View Answer All the above

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