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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In acoustics, the sound absorption coefficient of an open window is taken as:
सही उत्तर: क) 1.0
An open window lets all incident sound pass out without reflection, so it is taken as a perfect absorber with coefficient 1.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The SI unit of thermal conductivity of a building material is:
सही उत्तर: घ) W/(m·K)
Thermal conductivity is the heat flow per unit area per unit temperature gradient, expressed in W/(m·K).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Epoxy resins are commonly used in construction for:
सही उत्तर: ग) Bonding, crack injection and repair of concrete, and chemical-resistant floorings
Epoxies are thermosetting resins with strong adhesion and chemical resistance, used as adhesives, injection grouts and coatings.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Polycarbonate sheets are widely used for skylights and canopies because they are:
सही उत्तर: ख) Transparent, light and have very high impact resistance
Polycarbonate is a tough, transparent thermoplastic, far more impact-resistant than glass.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Colour wash for walls is prepared by:
सही उत्तर: क) Adding a suitable colouring pigment to whitewash
Colour wash is whitewash (slaked lime with water and gum) with a lime-fast mineral pigment added.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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'Bleeding' as a paint defect refers to:
सही उत्तर: घ) Staining or discolouring of a new coat by soluble colouring matter from the underlying surface or coat
Resins, tar or dyes in the substrate dissolve into the new paint and show through as stains.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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'Sagging' (running) of a paint film on vertical surfaces is mainly caused by:
सही उत्तर: ग) Applying the paint too thickly or using paint that is too thin
Excessively thick coats or over-thinned paint flow downwards before setting, forming curtains or runs.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Bituminous paint is most suitable for:
सही उत्तर: ख) Iron and steel work in contact with water or soil, such as pipes and tanks
Bituminous paints form a water-resistant, alkali-resistant film, useful for underground and submerged metal work.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Low-emissivity (low-E) glass used in windows has a thin coating that mainly:
सही उत्तर: ग) Reduces the transfer of radiant heat while allowing visible light to pass
Low-E coatings reflect long-wave infrared heat, improving thermal insulation without greatly reducing daylight.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Hard glass (Bohemian glass), used for glassware that must withstand high temperatures, is mainly a:
सही उत्तर: ख) Potash-lime glass
Potash-lime glass has a high fusion point and resists heat and chemicals better than ordinary soda-lime glass.
💬 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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