खानेपानी र सरसफाइ – Water Supply & Sanitation MCQ
खानेपानी र सरसफाइ – सिभिल इन्जिनियरिङ
Water Supply & Sanitation · Civil Engineering · ३९४ प्रश्न
३९४ 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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In Nepal, arsenic contamination of groundwater is mainly a problem in the:
सही उत्तर: घ) Terai region
Shallow tube wells in the Terai have been found to contain arsenic above the safe limit.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Methaemoglobinaemia (blue baby syndrome) in infants is linked to a high concentration in drinking water of:
सही उत्तर: घ) Nitrates
Nitrate is converted to nitrite, which reduces the blood's oxygen-carrying capacity in infants.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Water containing excess fluoride, when drunk for a long time, causes:
सही उत्तर: क) Fluorosis
Too much fluoride causes dental and skeletal fluorosis; too little causes dental caries.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Solar disinfection (SODIS) of drinking water at household level uses:
सही उत्तर: ख) Clear plastic (PET) bottles exposed to sunlight
SODIS uses the UV rays and heat of sunlight to kill germs in water held in clear PET bottles.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A town supplies 5 MLD of water disinfected with a chlorine dose of 2 mg/L. If bleaching powder has 25% available chlorine, the bleaching powder needed per day is:
सही उत्तर: ग) 40 kg
Chlorine needed = 5 x 2 = 10 kg/day, so bleaching powder = 10 / 0.25 = 40 kg/day.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Chlorine is applied at 2.0 mg/L and the residual after the contact period is 0.2 mg/L. The chlorine demand of the water is:
सही उत्तर: ग) 1.8 mg/L
Chlorine demand = dose - residual = 2.0 - 0.2 = 1.8 mg/L.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Among chlorine species in water, the most effective disinfectant is:
सही उत्तर: घ) Hypochlorous acid (HOCl)
HOCl is a much stronger germicide than OCl- or chloramines.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Breakpoint chlorination is the dose of chlorine:
सही उत्तर: क) Beyond which any added chlorine appears as free residual chlorine
After the breakpoint, chloramines and other demands are satisfied and added chlorine shows up as free residual.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Aeration of water is mainly used to remove:
सही उत्तर: ख) Taste and odour, CO2 and H2S
Aeration strips dissolved gases such as CO2 and H2S that cause taste, odour and corrosion.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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'Air binding' in a rapid sand filter is mainly caused by:
सही उत्तर: ख) Negative head developing in the filter bed
When head loss exceeds the water depth, negative pressure lets dissolved air come out and clog the sand.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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