इन्जिनियरिङ सेवा असिस्टेन्ट सब-इन्जिनियर (चौथो तह) – प्राविधिक पत्र
इन्जिनियरिङ सेवा – असिस्टेन्ट सब-इन्जिनियर (चौथो तह)
Assistant Sub-Engineer – 4th Level · Engineering Service
१,९४० प्रश्न उपलब्ध। मोड छान्नुहोस्:
प्राविधिक पत्र: प्रश्न र उत्तर
सही लागेको विकल्पमा थिच्नुहोस्। सही भए हरियो, गलत भए रातो देखिन्छ; ५ सेकेन्डपछि सही उत्तर र व्याख्या देखिन्छ।
सही: ० / ०
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According to Stokes' law, the settling velocity of a small discrete particle in water is proportional to:
सही उत्तर: घ) The square of the particle diameter
Stokes' law gives Vs = g(Gs - 1)d^2/(18 nu), so settling velocity varies with d squared.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In water treatment, flocculation is achieved by:
सही उत्तर: क) Slow, gentle mixing that lets small particles join into larger flocs
Gentle stirring makes destabilised particles collide and grow into settleable flocs without breaking them.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The optimum dose of coagulant for a given raw water is determined in the laboratory by the:
सही उत्तर: ख) Jar test
In the jar test, samples are dosed with different amounts of coagulant to find the most effective dose.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Turbidity of water measured by a nephelometer is expressed in:
सही उत्तर: ग) NTU
A nephelometer measures scattered light, and the result is reported in Nephelometric Turbidity Units (NTU).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A water sample contains 60 mg/L of Ca2+ and 24.3 mg/L of Mg2+. Its total hardness expressed as CaCO3 is:
सही उत्तर: ग) 250 mg/L
Ca gives 60 x 50/20 = 150 and Mg gives 24.3 x 50/12.15 = 100, so the total is 250 mg/L as CaCO3.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Hardness of water can be removed by the base-exchange method using:
सही उत्तर: घ) Zeolite
Zeolite exchanges its sodium ions for the calcium and magnesium ions that cause hardness.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Temporary hardness of water is caused mainly by:
सही उत्तर: क) Bicarbonates of calcium and magnesium
Bicarbonate hardness can be removed by boiling, so it is called temporary hardness.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Kuichling's formula in water supply engineering is used to estimate:
सही उत्तर: ख) Fire demand
Kuichling's formula, Q = 3182 sqrt(P), gives the quantity of water needed for fire fighting.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In water supply design, the maximum hourly demand is commonly taken as about:
सही उत्तर: ख) 2.7 times the average hourly demand
Maximum daily demand is about 1.8 times the average, and the peak hour is 1.5 times that, giving 1.8 x 1.5 = 2.7.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The population of a town was 40,000 in 2001, 48,000 in 2011 and 57,600 in 2021. By the geometric increase method, the population in 2031 will be:
सही उत्तर: ग) 69,120
The growth rate is a constant 20% per decade, so 57,600 x 1.2 = 69,120.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
यी अभ्यास प्रश्न हुन्, आधिकारिक प्रश्न होइनन्। पाठ्यक्रम, विज्ञापन र नतिजाका लागि सम्बन्धित निकायको आधिकारिक वेबसाइट हेर्नुहोस्। उत्तरमा गल्ती भेटे प्रश्नमुनिको "टिप्पणी / गल्ती रिपोर्ट" मा लेख्नुहोस्।
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