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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A 150 mm × 150 mm concrete beam on a 600 mm span is tested under two-point (third-point) loading and fails at a total load of 30 kN, with fracture within the middle third. Its flexural strength is about:
सही उत्तर: घ) 5.33 N/mm²
Modulus of rupture = PL/(bd²) = 30,000 × 600 / (150 × 150²) = 5.33 N/mm².
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A concrete cylinder 150 mm in diameter and 300 mm long fails at a load of 200 kN in the split tensile test. Its splitting tensile strength is about:
सही उत्तर: ग) 2.83 N/mm²
fct = 2P/(πDL) = 2 × 200,000 / (π × 150 × 300) ≈ 2.83 N/mm².
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A mix requires 600 kg of dry sand per batch. If the sand at site contains 3% free surface moisture, the mass of wet sand to be weighed and the change in mixing water are:
सही उत्तर: ख) 618 kg of sand; reduce water by 18 litres
Wet sand = 600 × 1.03 = 618 kg; it brings 18 kg of free water, so the added water is reduced by 18 litres.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Taking the specific gravity of cement as 3.15, the absolute volume of one 50 kg bag of cement is about:
सही उत्तर: क) 0.0159 m³
Absolute volume = mass ÷ (specific gravity × density of water) = 50 ÷ (3.15 × 1000) = 0.0159 m³.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The Boucherie process, used for preserving freshly cut bamboo, works by:
सही उत्तर: घ) Forcing the preservative through the vessels of green bamboo under pressure, displacing the sap
In the Boucherie (sap displacement) method a preservative such as boric acid–borax solution is pushed through fresh culms, replacing the sap.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Shuttering oil or another release agent is applied to formwork mainly to:
सही उत्तर: ग) Prevent the concrete from sticking to the formwork, giving easy stripping and a clean surface
Release agents form a thin film that stops concrete bonding to the forms, protecting both the forms and the concrete surface.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In preplaced (prepacked) aggregate concrete:
सही उत्तर: ख) Coarse aggregate is first placed in the formwork and the voids are then filled by injecting cement grout
Grout is pumped into the voids of pre-placed coarse aggregate, useful for underwater work and repairs.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Roller compacted concrete (RCC) is typically used for:
सही उत्तर: क) Dams and heavy-duty pavements, placed with earth-moving equipment and compacted by rollers
RCC is a zero-slump concrete spread and compacted by vibratory rollers, allowing rapid, economical construction of dams and pavements.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Vinsol resin is used in concrete as a/an:
सही उत्तर: घ) Air-entraining agent
Vinsol resin, a wood-derived resin, is a common air-entraining admixture.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Chemically, gypsum and plaster of Paris are respectively:
सही उत्तर: ख) CaSO4·2H2O and CaSO4·½H2O
Gypsum is calcium sulphate dihydrate; heating drives off part of the water to give the hemihydrate, plaster of Paris.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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