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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CRS bars used as reinforcement in aggressive environments are:
सही उत्तर: क) Corrosion resistant steel bars
CRS bars contain small amounts of alloying elements such as copper, chromium or phosphorus to improve resistance to corrosion.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The suffix 'D' in reinforcement grades such as Fe 500D indicates bars with:
सही उत्तर: घ) Higher ductility, with greater elongation and stricter limits on sulphur and phosphorus
D-grade bars have enhanced ductility requirements, which is useful in earthquake-resistant construction.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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As per IS 1786, the minimum ultimate tensile strength of Fe 415 reinforcing bars is:
सही उत्तर: ग) 485 N/mm²
Fe 415 must have a tensile strength of at least 485 N/mm² (and at least 10% above its actual proof stress).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The steel-making furnace that uses mainly steel scrap as its charge, melted by electricity, is the:
सही उत्तर: ख) Electric arc furnace
An electric arc furnace melts scrap (and sponge iron) using an electric arc between graphite electrodes.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Timber is weakest when loaded in:
सही उत्तर: क) Tension perpendicular to the grain
The fibres are held together only weakly across the grain, so tension perpendicular to the grain is its weakest direction.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Glulam (glued laminated timber) consists of:
सही उत्तर: घ) Several layers of dimension lumber glued together with grains parallel to form large structural members
In glulam, laminations are glued with grains parallel, allowing long, strong and curved beams to be made.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Charring the lower ends of wooden posts before embedding them in the ground is done to:
सही उत्तर: ग) Protect them from decay and insects by forming a carbonised layer
The charred layer is not attacked readily by fungi and insects, giving a simple form of preservation.
💬 टिप्पणी / गल्ती रिपोर्ट (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)
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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