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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Ground granulated blast furnace slag (GGBS) used in concrete is described as a:
सही उत्तर: क) Latent hydraulic material that hydrates when activated by lime or alkalis
GGBS has its own latent hydraulic property, which is activated by the calcium hydroxide and alkalis released from cement.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Sorel cement, used for floorings, is a:
सही उत्तर: घ) Magnesium oxychloride cement
Sorel cement is made by mixing calcined magnesia with a magnesium chloride solution.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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High alumina cement is manufactured by fusing together:
सही उत्तर: ग) Bauxite and limestone
High alumina cement is made by melting a mixture of bauxite and limestone (or lime) and grinding the product.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Masonry cement is intended mainly for:
सही उत्तर: ख) Mortars for masonry and plaster, as it gives good workability and water retention
Masonry cement contains OPC with fine inert or lime materials and air-entraining agents, giving workable mortars of moderate strength.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Cement stored even under good conditions for about three months is generally expected to lose roughly what percentage of its strength?
सही उत्तर: क) About 20%
Cement absorbs moisture from the air during storage; a loss of about 20% at 3 months is commonly assumed.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A standard bag of cement used in Nepal weighs:
सही उत्तर: घ) 50 kg
Cement is supplied in 50 kg bags, which is the usual unit for estimating and batching.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In a modern dry-process cement plant, the raw meal is heated by kiln exhaust gases before entering the rotary kiln in a:
सही उत्तर: ग) Cyclone preheater
Suspension (cyclone) preheaters use hot kiln gases to preheat and partly calcine the raw meal, saving fuel.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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During the early hydration of cement, the reaction of tricalcium aluminate with gypsum produces:
सही उत्तर: ख) Ettringite (calcium sulphoaluminate hydrate)
Gypsum reacts with C3A to form ettringite, which coats the C3A grains and prevents flash set.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A pozzolana is a material that:
सही उत्तर: क) Is siliceous or aluminous, has little binding value by itself, but reacts with calcium hydroxide in the presence of water to form cementitious compounds
Pozzolanas such as fly ash and surkhi react with the lime released by cement hydration to form additional C-S-H.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Increasing the fineness of cement generally:
सही उत्तर: घ) Increases the rate of hydration and early strength gain
Finer particles expose more surface area to water, so hydration and early strength development are faster.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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