खानेपानी र सरसफाइ – Water Supply & Sanitation MCQ
खानेपानी र सरसफाइ – सिभिल इन्जिनियरिङ
Water Supply & Sanitation · Civil Engineering · ४०७ प्रश्न
४०७ प्रश्न उपलब्ध। मोड छान्नुहोस्:
खानेपानी र सरसफाइ: प्रश्न र उत्तर
सही लागेको विकल्पमा थिच्नुहोस्। सही भए हरियो, गलत भए रातो देखिन्छ; ३ सेकेन्डपछि सही उत्तर र व्याख्या देखिन्छ।
सही: ० / ०
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A constructed wetland (reed bed) system, used for wastewater treatment in some towns and institutions of Nepal, treats wastewater mainly through:
सही उत्तर: घ) Natural processes of plants, gravel media and microorganisms
Reed beds use filtration, sedimentation and microbial action in the root zone of wetland plants, needing little energy and maintenance.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In a UASB reactor, wastewater is treated by:
सही उत्तर: ग) Anaerobic bacteria in a sludge blanket through which wastewater flows upward
Upflow Anaerobic Sludge Blanket reactors pass wastewater up through a dense granular sludge bed; biogas is collected at the top.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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An Imhoff tank is a:
सही उत्तर: क) Two-storey tank with sedimentation in the upper compartment and sludge digestion in the lower
Settled solids slide through slots into the lower digestion chamber, so settling and digestion occur in one unit without mixing.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The main useful gas produced in anaerobic digestion of sewage sludge is:
सही उत्तर: घ) Methane
Digester gas contains roughly 60–70% methane (rest mainly CO2) and can be used as fuel.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A trickling filter in sewage treatment is an example of a(n):
सही उत्तर: ग) Attached-growth aerobic process
Microorganisms grow as a slime layer on stones or plastic media and oxidise organic matter as sewage trickles over them.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In a 30-minute settling test, mixed liquor with MLSS 2500 mg/L gives a settled sludge volume of 250 mL/L. The sludge volume index is:
सही उत्तर: ग) 100 mL/g
SVI = settled volume (mL/L) × 1000/MLSS (mg/L) = 250 × 1000/2500 = 100 mL/g, indicating good settleability.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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An activated sludge plant treats 1000 m³/day of sewage with BOD 200 mg/L in an aeration tank of 500 m³ with MLSS 2000 mg/L. The F/M ratio is:
सही उत्तर: घ) 0.2 per day
F/M = Q·S0/(V·X) = 1000 × 200/(500 × 2000) = 0.2 kg BOD per kg MLSS per day.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The flow of sewage in sewers in the absence of storm water, i.e. the normal daily sewage flow, is called:
सही उत्तर: ग) Dry weather flow
Dry weather flow (DWF) is the average sewage flow during periods without rainfall.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The smoke test on a house drainage system is carried out to:
सही उत्तर: घ) Detect leaks and defective joints by forcing smoke into the closed drain
Smoke is pumped into the sealed drainage system; its escape at any point reveals leaks; the water (hydraulic) test is another tightness test.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Vitrified clay (stoneware) pipes are favoured for small house sewers mainly because they:
सही उत्तर: ग) Resist corrosion by sewage acids and gases
Glazed stoneware is highly resistant to H2S-related corrosion and has a smooth interior, though it is brittle and weak in pressure.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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