इन्जिनियरिङ सेवा सब-इन्जिनियर (पाँचौँ तह) – प्राविधिक पत्र
इन्जिनियरिङ सेवा – सब-इन्जिनियर (पाँचौँ तह)
Sub-Engineer – 5th Level · Engineering Service
५०३ 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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The biological layer called 'schmutzdecke' forms on the top of a:
सही उत्तर: ख) Slow sand filter
In a slow sand filter a thin biological film forms on the sand surface and does most of the purification.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A settling tank of 500 m3 capacity treats 6,000 m3 of water per day. Its detention time is:
सही उत्तर: ग) 2 hours
Detention time = volume / flow = 500 / 6,000 day = 2 hours.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A rectangular sedimentation tank is 15 m long and 8 m wide and treats 4,800 m3/day. Its surface overflow rate is:
सही उत्तर: घ) 40 m3/m2/day
Surface overflow rate = Q / plan area = 4,800 / (15 x 8) = 40 m3/m2/day.
💬 टिप्पणी / गल्ती रिपोर्ट (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)
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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