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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As per IS 456, concrete grades M25 to M55 are classified as:
सही उत्तर: ग) Standard concrete
IS 456 groups M10–M20 as ordinary, M25–M55 as standard and M60 and above as high strength concrete.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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As per IS 456, the minimum grade of concrete for reinforced concrete work under 'mild' exposure is:
सही उत्तर: क) M20
IS 456 requires at least M20 for RCC in mild exposure, rising to M25, M30, M35 and M40 for harsher exposures.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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As per IS 456, for reinforced concrete under 'moderate' exposure, the maximum free water-cement ratio is:
सही उत्तर: ख) 0.50
IS 456 specifies for RCC: mild 0.55, moderate 0.50, severe and very severe 0.45, extreme 0.40.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Sulphate attack on hardened concrete causes damage mainly through:
सही उत्तर: ख) Formation of expansive compounds such as ettringite and gypsum
Sulphates react with hydrated aluminates and calcium hydroxide to form ettringite and gypsum, whose expansion cracks the concrete.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Compared with OPC, Portland Pozzolana Cement generally:
सही उत्तर: घ) Gains strength more slowly but produces less heat of hydration and has better durability
Pozzolana reacts slowly with calcium hydroxide, so early strength is lower but heat is reduced and long-term impermeability improves.
💬 टिप्पणी / गल्ती रिपोर्ट (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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