खानेपानी र सरसफाइ – Water Supply & Sanitation MCQ
खानेपानी र सरसफाइ – सिभिल इन्जिनियरिङ
Water Supply & Sanitation · Civil Engineering · ४०३ प्रश्न
४०३ 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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The WHO guideline value for arsenic in drinking water is:
सही उत्तर: क) 10 μg/L
WHO's provisional guideline for arsenic is 10 μg/L (0.01 mg/L).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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As per Nepal's National Drinking Water Quality Standards (NDWQS), the maximum permissible concentration of arsenic in drinking water is:
सही उत्तर: क) 50 μg/L
Nepal's NDWQS sets arsenic at 50 μg/L (0.05 mg/L), while the WHO guideline value is 10 μg/L.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Water that is produced but not billed, due to leakage, illegal connections and metering errors, is called:
सही उत्तर: क) Non-revenue water
Non-revenue water (unaccounted-for water) includes physical losses (leaks) and commercial losses (theft, meter errors).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The logistic curve method of population forecasting assumes that population growth follows a(n):
सही उत्तर: ख) S-shaped curve approaching a saturation limit
The logistic curve shows slow early growth, rapid middle growth and then levelling off toward a saturation population.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A town had populations of 40,000, 46,000, 54,000 and 64,000 in four successive decades. By the incremental increase method, the population after the next decade is:
सही उत्तर: क) 74,000
Increments 6000, 8000, 10000 (mean 8000); increments of increase 2000, 2000 (mean 2000); P = 64,000 + 8000 + 2000 = 74,000.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A flowing artesian well occurs when:
सही उत्तर: क) The piezometric surface of a confined aquifer lies above the ground surface at the well
If the confined aquifer's pressure head rises above ground level, water flows out without pumping.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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When water is pumped from a well, the water table around it takes a shape known as the:
सही उत्तर: घ) Cone of depression
Pumping lowers the water table most at the well, forming a cone of depression whose outer limit is the radius of influence.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A well fully penetrates a confined aquifer 10 m thick with k = 20 m/day. The drawdowns at 10 m and 100 m from the well differ by 1 m. By Thiem's equation, the discharge is about:
सही उत्तर: ख) 546 m³/day
Q = 2πkb(s1 − s2)/ln(r2/r1) = 2π × 20 × 10 × 1/ln10 ≈ 1256.6/2.303 ≈ 546 m³/day.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A roof of 50 m² plan area receives 1500 mm of annual rainfall. With a runoff coefficient of 0.8, the rainwater that can be harvested per year is:
सही उत्तर: घ) 60 m³
Volume = area × rainfall × coefficient = 50 × 1.5 × 0.8 = 60 m³.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In rural gravity water supply schemes in the hills of Nepal, the structure built to collect and protect water at a spring source is the:
सही उत्तर: ख) Spring intake (spring box)
A spring intake encloses the spring eye with a protected collection chamber, preventing contamination and directing flow to the transmission main.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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