इन्जिनियरिङ सेवा सब-इन्जिनियर (पाँचौँ तह) – प्राविधिक पत्र
इन्जिनियरिङ सेवा – सब-इन्जिनियर (पाँचौँ तह)
Sub-Engineer – 5th Level · Engineering Service
१,५०३ 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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In Portland Pozzolana Cement (fly ash based), the proportion of fly ash permitted is generally:
सही उत्तर: ख) 15% to 35%
Fly ash based PPC contains between 15% and 35% fly ash by mass of the cement.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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'False set' of cement refers to:
सही उत्तर: क) Premature stiffening due to dehydrated gypsum, which disappears on remixing without extra water
False set is caused by gypsum dehydrated during grinding recrystallising; plasticity returns on further mixing, unlike flash set.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The tensile strength of cement mortar was traditionally determined by testing:
सही उत्तर: ग) Briquettes of figure-of-eight shape
The briquette test pulls a dumb-bell (figure-8) shaped specimen of 1:3 cement mortar in tension.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The minimum specific surface (Blaine fineness) specified for ordinary Portland cement is about:
सही उत्तर: ग) 225 m²/kg
OPC should have a specific surface of not less than 225 m²/kg (2250 cm²/g) by the air permeability method.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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As per Indian Standard practice, cement bags should not be stacked more than how many bags high?
सही उत्तर: घ) 10
Stacks are limited to about 10 bags high to avoid lumping of the bottom bags by pressure; bags are kept on a raised platform away from walls.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The main purpose of applying preservatives such as linseed oil or paraffin to stone surfaces is to:
सही उत्तर: घ) Protect the stone against weathering by closing surface pores
Stone preservatives fill or coat the surface pores, reducing the entry of water and acidic gases that cause weathering.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A 'freestone' in building is a stone that:
सही उत्तर: ख) Can be easily cut and worked in any direction because it has no marked bedding
Freestones such as some fine-grained sandstones and limestones can be sawn and carved freely in any direction.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Basalt differs from granite mainly in that basalt is:
सही उत्तर: घ) Extrusive and fine-grained
Basalt solidifies quickly from lava at the surface, giving a fine-grained extrusive rock; granite cools slowly at depth and is coarse-grained.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Dolomite is a rock composed mainly of:
सही उत्तर: क) Calcium magnesium carbonate
Dolomite, CaMg(CO3)2, is a carbonate rock similar to limestone but containing a large proportion of magnesium carbonate.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Salt glazing of stoneware pipes is done by:
सही उत्तर: ग) Throwing common salt into the kiln at high temperature so it forms a glassy coating
Common salt vaporises in the hot kiln and reacts with silica of the clay surface to form a thin sodium silicate glaze.
💬 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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