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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'Case hardening' as a defect in the kiln seasoning of timber occurs when:
सही उत्तर: घ) The outer layers dry and set too quickly, leaving the interior in a stressed, wetter state
Rapid surface drying sets the outer shell under tension while the core is still moist, causing internal stresses and later checks.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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'Druxiness' is a timber defect characterised by:
सही उत्तर: ग) White decayed spots concealed by healthy wood
Druxiness shows as whitish decayed spots, generally entering through broken branches and hidden by sound wood.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The 'conversion' of timber means:
सही उत्तर: क) Sawing felled logs into marketable sizes such as planks, battens and scantlings
Conversion is the process of cutting logs into commercial sizes after felling.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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'Popping' or 'blowing' in a lime plaster surface is mainly caused by:
सही उत्तर: घ) Unslaked lime particles that slake and expand after the plaster is applied
Particles of quicklime left unslaked expand on later hydration, forming small conical holes or blisters in the plaster.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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According to the Indian Standard classification of building limes (IS 712), Class C lime, used mainly for finishing coats and whitewashing, is:
सही उत्तर: ख) Fat lime
Class A is eminently hydraulic lime for structural work, while Class C is fat lime used for finishing coat and whitewash.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Fine aggregate of fineness modulus 2.6 and coarse aggregate of fineness modulus 7.0 are to be combined to give an all-in aggregate of fineness modulus 5.4. The ratio of fine to coarse aggregate is about:
सही उत्तर: क) 1 : 1.75
If x is the fine fraction: 2.6x + 7.0(1 − x) = 5.4 gives x = 0.364; ratio = 0.364 : 0.636 ≈ 1 : 1.75.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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As per IS 383, the Los Angeles abrasion value of coarse aggregate for concrete wearing surfaces should not exceed:
सही उत्तर: ग) 30%
IS 383 limits the LA abrasion value to 30% for wearing surfaces and 50% for other concrete.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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As per IS 456, the minimum grade of concrete for reinforced concrete under 'severe' exposure is:
सही उत्तर: घ) M30
The minimum RCC grades are M20 (mild), M25 (moderate), M30 (severe), M35 (very severe) and M40 (extreme).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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As per IS 456, when mineral admixtures or blended cements are used, exposed concrete surfaces should be kept moist for a minimum of:
सही उत्तर: ग) 10 days
IS 456 recommends at least 7 days of moist curing for OPC and at least 10 days when mineral admixtures or blended cements are used.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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As per IS 456 (OPC, normal temperature), the props to slabs spanning more than 4.5 m may be removed after:
सही उत्तर: ख) 14 days
Props to slabs spanning up to 4.5 m may be removed after 7 days and those spanning over 4.5 m after 14 days.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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