निर्माण सामग्री – Construction Materials MCQ
निर्माण सामग्री – सिभिल इन्जिनियरिङ
Construction Materials · Civil Engineering · १,००८ प्रश्न
१,००८ प्रश्न उपलब्ध। मोड छान्नुहोस्:
निर्माण सामग्री: 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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Which form of iron is the purest, containing the least carbon?
सही उत्तर: क) Wrought iron
Wrought iron is almost pure iron with very low carbon (well below 0.15%); it is tough, malleable and ductile.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The fibre saturation point of timber, below which strength and shrinkage begin to change with moisture, is usually about:
सही उत्तर: घ) 25% to 30% moisture content
At the fibre saturation point (about 25–30%), cell walls are saturated but cavities are empty; drying below it causes shrinkage and strength gain.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A timber sample weighs 120 g when wet and 100 g after oven drying. Its moisture content (dry basis) is:
सही उत्तर: ख) 20%
Moisture content = (wet − dry)/dry × 100 = (120 − 100)/100 × 100 = 20%.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Medullary rays in a tree trunk are:
सही उत्तर: ख) Thin radial strips of cells running from the pith outwards, which hold the fibres together and carry sap horizontally
Medullary rays extend radially from the pith towards the bark, binding the annual rings and transporting food horizontally.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The botanical name of teak, a durable and termite-resistant timber, is:
सही उत्तर: घ) Tectona grandis
Teak is Tectona grandis; Shorea robusta is sal, Dalbergia sissoo is sissoo and Cedrus deodara is deodar.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Blockboard consists of:
सही उत्तर: ख) A core of wooden strips (blocks) glued side by side, faced with veneers on both sides
Blockboard has a core of softwood strips sandwiched between veneers, giving a stiff board suitable for doors and shelves.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Particle board (chipboard) is manufactured from:
सही उत्तर: ग) Wood chips or particles bonded with a synthetic resin under heat and pressure
Particle board uses wood chips/particles mixed with resin and pressed into sheets.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Quarter sawing (radial sawing) of logs is preferred for high-quality boards because the boards:
सही उत्तर: ग) Shrink and warp less and show the figure of medullary rays
Quarter-sawn boards have growth rings nearly perpendicular to the face, giving better dimensional stability and attractive figure.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Bethell's process of preserving timber is a:
सही उत्तर: क) Full-cell pressure process in which preservative is forced into the timber after a vacuum
In the full-cell (Bethell) process a vacuum is applied first, then preservative is forced in under pressure, filling the cells.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Wet rot in timber typically occurs when the timber is:
सही उत्तर: ख) Subjected to alternate wetting and drying
Alternate wet and dry conditions favour fungal decay (wet rot); timber permanently dry or permanently submerged decays far less.
💬 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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