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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Clamp burning of bricks is characterised by:
सही उत्तर: ख) A temporary structure in which bricks and fuel are stacked together, giving bricks of non-uniform quality
A clamp is a temporary intermittent arrangement of green bricks and fuel; burning is uneven, so bricks vary in quality.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The correct sequence of operations in the manufacture of clay bricks is:
सही उत्तर: ख) Preparation of clay, moulding, drying, burning
Clay is prepared (unsoiling, digging, weathering, blending, tempering), then moulded, dried and finally burnt.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The presence of iron pyrites in brick earth is undesirable because it:
सही उत्तर: ग) Causes crystallisation and disintegration of bricks during burning, and discolouration
Iron pyrites oxidise and decompose during burning, causing bricks to crystallise, split and become discoloured.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Excess silica (sand) in brick earth, without enough clay, makes the bricks:
सही उत्तर: क) Brittle and weak, as the earth loses cohesion
Silica prevents shrinkage, but in excess it destroys the cohesion of the clay, giving brittle, weak bricks.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In good brick earth, the proportion of silica (sand) is generally about:
सही उत्तर: ग) 50% to 60%
Good brick earth contains about 50–60% silica and 20–30% alumina, with small amounts of lime, iron oxide and magnesia.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The amount of cement required for 1 m³ of 1:4 cement-sand mortar, taking dry volume factor 1.30 and cement density 1440 kg/m³, is about:
सही उत्तर: घ) 374 kg
Cement volume = 1.30 × 1/5 = 0.26 m³; mass = 0.26 × 1440 ≈ 374 kg (about 7.5 bags).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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To prepare 1 m³ of wet cement mortar, the dry volume of materials taken is usually increased by about:
सही उत्तर: घ) 27% to 33%
Dry volume is taken about 1.27–1.33 times the wet volume to account for voids filled when water is added.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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For ordinary brick masonry, a commonly used cement-sand mortar ratio is:
सही उत्तर: क) 1 : 6
1:6 cement-sand mortar is common for general brickwork; richer mixes like 1:4 are used for load-bearing or exposed work.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Ordinary window glass (soda-lime glass) is made mainly from silica, soda and:
सही उत्तर: घ) Lime
Soda-lime glass is made by fusing silica sand, soda ash and lime; lead glass and borosilicate glass use lead oxide and boric oxide.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Distemper is a paint in which the vehicle is generally:
सही उत्तर: ख) Water with glue/size
Distemper consists of whiting or chalk, pigment and glue size mixed in water; it is a water-bound paint.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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