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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The main health hazard associated with handling and cutting asbestos cement products is:
सही उत्तर: ख) Inhaling fibres, which can cause asbestosis and lung cancer
Airborne asbestos fibres lodge in the lungs, causing asbestosis, mesothelioma and lung cancer, which is why its use is restricted.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following is commonly used as a thermal insulating material in buildings?
सही उत्तर: क) Expanded polystyrene
Materials with many trapped air cells, such as expanded polystyrene and glass wool, have low thermal conductivity.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Gypsum board (plasterboard) consists of:
सही उत्तर: ख) A core of set gypsum faced on both sides with paper
Plasterboard has a gypsum core between paper liners and is used for partitions and false ceilings.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Terrazzo flooring consists of:
सही उत्तर: ख) Marble chips set in cement mortar, ground and polished
Terrazzo is a mix of marble chips and cement (often coloured) laid, cured and then ground and polished to a smooth surface.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Keene's cement, used for high-quality smooth plaster, is made by:
सही उत्तर: क) Calcining gypsum, soaking it in alum solution and re-calcining at high temperature
Keene's cement is an anhydrous gypsum plaster produced by heating gypsum, treating it with alum and reheating; it sets slowly to a very hard white finish.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Rice husk ash, when produced by controlled burning, is useful in concrete and mortar as a:
सही उत्तर: ख) Pozzolanic material
Controlled-burnt rice husk ash is rich in reactive amorphous silica and reacts with lime as a pozzolana.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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When fat lime is slaked, its volume increases to about:
सही उत्तर: घ) 2 to 2.5 times the original volume
Fat (rich) lime slakes vigorously with much heat and swells to about two to two-and-a-half times its volume.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Aggregate obtained directly from a pit or river containing both fine and coarse fractions together is called:
सही उत्तर: घ) All-in aggregate
All-in (pit-run) aggregate contains a mixture of fine and coarse sizes as found in nature.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The 'saturated surface-dry (SSD)' condition of aggregate means that:
सही उत्तर: ग) All pores are filled with water but there is no free water on the surface
SSD aggregate neither absorbs water from nor gives water to the mix, so it is the reference state for mix water calculations.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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An aggregate weighs 1020 g in saturated surface-dry condition and 1000 g after oven drying. Its water absorption is:
सही उत्तर: ग) 2%
Absorption = (1020 − 1000)/1000 × 100 = 2% of oven-dry weight.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
यी अभ्यास प्रश्न हुन्, आधिकारिक प्रश्न होइनन्। पाठ्यक्रम, विज्ञापन र नतिजाका लागि सम्बन्धित निकायको आधिकारिक वेबसाइट हेर्नुहोस्। उत्तरमा गल्ती भेटे प्रश्नमुनिको "टिप्पणी / गल्ती रिपोर्ट" मा लेख्नुहोस्।
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