खानेपानी र सरसफाइ – Water Supply & Sanitation MCQ
खानेपानी र सरसफाइ – सिभिल इन्जिनियरिङ
Water Supply & Sanitation · Civil Engineering · ४०६ प्रश्न
४०६ 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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HDPE pipes, widely used in water supply schemes in Nepal, are commonly jointed by:
सही उत्तर: ग) Butt fusion (heat) welding
Pipe ends are heated and pressed together (butt fusion), producing a leak-proof joint as strong as the pipe.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In a radial system of water distribution:
सही उत्तर: ग) The area is divided into zones, each fed radially from a centrally placed elevated reservoir
The radial system supplies each zone from a distribution reservoir at its centre through radially laid pipes, giving high pressures and quick service.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The water distribution layout in which all pipes are interconnected so that water can reach any point from more than one direction, with no dead ends, is the:
सही उत्तर: क) Grid-iron system
In a grid-iron (looped) layout water circulates freely; repairs affect only a small area and stagnation is avoided.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Removal of permanent hardness by adding lime and soda ash is called the:
सही उत्तर: क) Lime-soda process
Lime removes carbonate hardness and soda ash (Na2CO3) removes non-carbonate (permanent) hardness by precipitation.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Chloramines, formed by reaction of chlorine with ammonia, are preferred in some systems because they:
सही उत्तर: घ) Give a more stable, longer-lasting residual in long distribution networks
Combined chlorine (chloramine) is a weaker but more persistent disinfectant and forms fewer chlorinated by-products.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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After superchlorination, excess chlorine is removed (dechlorination) using:
सही उत्तर: ग) Sodium thiosulphate or sulphur dioxide
Reducing agents such as sodium thiosulphate, sodium bisulphite or SO2 react with excess chlorine.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A major disadvantage of ultraviolet (UV) and ozone disinfection compared with chlorination is that they:
सही उत्तर: ख) Leave no residual disinfectant in the distribution system
UV and ozone are effective but leave no lasting residual, so a small chlorine dose is often added to protect the distribution network.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Iron and manganese dissolved in groundwater are commonly removed by:
सही उत्तर: क) Aeration (oxidation) followed by settling and filtration
Aeration oxidises soluble Fe²⁺ and Mn²⁺ to insoluble forms, which are then settled and filtered.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The Kanchan Arsenic Filter, promoted in the Terai of Nepal, removes arsenic mainly using:
सही उत्तर: ग) Iron nails that rust and adsorb arsenic, followed by a sand layer
Rusting iron nails form iron hydroxide that adsorbs arsenic; the sand layer below filters the particles and pathogens.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Removal of excess fluoride from drinking water by adding alum and lime followed by settling is known as the:
सही उत्तर: ख) Nalgonda technique
The Nalgonda technique, developed in India, removes fluoride by alum and lime precipitation and settling.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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