सिभिल इन्जिनियरिङ
सिभिल इन्जिनियरिङ
Civil Engineering · ५,१७१ प्रश्न
५,१७१ प्रश्न उपलब्ध। मोड छान्नुहोस्:
सिभिल इन्जिनियरिङ: 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 specific gravity of the actual wood substance (cell-wall material) of all timbers is approximately:
सही उत्तर: ख) 1.5
Wood substance has a specific gravity of about 1.5; differences in timber density arise from differences in porosity.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The innermost central part of a tree trunk, around which the annual rings form, is called the:
सही उत्तर: क) Pith (medulla)
The pith is the central core of the stem; the cambium is the growing layer just under the bark.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Fibreboard (such as hardboard) is manufactured from:
सही उत्तर: घ) Wood fibres bonded and compressed into sheets
Fibreboards are made by pressing wood fibres, with or without binders; plywood uses veneers and particle board uses chips.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A heart shake in timber is:
सही उत्तर: ग) A crack originating at the pith and extending towards the sapwood, caused by shrinkage of the heartwood
Heart shakes start at the centre of over-mature trees where the heartwood shrinks; star shakes begin from the bark.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A knot in timber that is formed from a dead branch and is loosely held in the surrounding wood is called a:
सही उत्तर: ख) Dead (loose) knot
Dead knots are not firmly attached and may fall out, weakening the timber; live knots are firmly embedded.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The method of sawing logs by making parallel cuts across the whole log, which is the quickest and most economical, is called:
सही उत्तर: क) Plain (ordinary) sawing
Plain or flat sawing produces boards with least labour and waste, though they tend to warp more than quarter-sawn boards.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Lime putty is:
सही उत्तर: घ) Slaked lime mixed with water to form a soft paste
Lime putty is a plastic paste of hydrated lime and water used in mortar and plaster.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Limestone is converted to quicklime by heating it in a kiln to a temperature of about:
सही उत्तर: ग) 900°C
Calcium carbonate decomposes into CaO and CO2 at about 900°C.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The split brass cylinder (mould) of the Le Chatelier soundness apparatus has an internal diameter and height of:
सही उत्तर: ख) 30 mm and 30 mm
The Le Chatelier mould is 30 mm in diameter and 30 mm high, with two indicator arms attached on either side of the split.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Gunpowder (blasting powder) used in quarrying consists of:
सही उत्तर: क) Potassium nitrate, charcoal and sulphur
Gunpowder is a mixture of saltpetre (potassium nitrate), charcoal and sulphur, roughly 75:15:10.
💬 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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