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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Blistering of a painted surface is mainly caused by:
सही उत्तर: क) Moisture or air trapped under the paint film
Moisture or vapour beneath the film expands when heated and lifts the paint into blisters.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Titanium dioxide is widely used in white paints because it:
सही उत्तर: क) Has very high opacity and is non-toxic
Titanium dioxide has excellent hiding power and is non-poisonous, so it has largely replaced white lead.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In a paint, the 'base' (e.g., white lead, zinc white or titanium dioxide) mainly provides:
सही उत्तर: क) Body and opacity to hide the surface
The base is the principal solid that forms the opaque film covering the surface; driers, thinners and pigments have other functions.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Anodising of aluminium is a process that:
सही उत्तर: ख) Thickens the protective oxide film on the surface by electrolysis
In anodising, the aluminium is made the anode in an electrolyte so a thicker, harder oxide layer forms, which can also be dyed.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Gun metal is an alloy consisting mainly of:
सही उत्तर: ग) Copper, tin and zinc
Gun metal is a bronze containing copper with about 10% tin and 2% zinc, used for valves and bearings.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Brass is an alloy of:
सही उत्तर: ग) Copper and zinc
Brass is copper with zinc, while bronze is copper with tin.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Cathodic protection of buried steel pipelines prevents corrosion by:
सही उत्तर: क) Making the steel the cathode, using sacrificial anodes or an impressed current
Connecting a more active metal (e.g., zinc or magnesium) or applying an impressed current makes the steel cathodic so it does not corrode.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Normalising of steel consists of heating above the critical temperature and then:
सही उत्तर: घ) Cooling in still air
Normalising refines grain and relieves stresses by air cooling, which is faster than furnace cooling used in annealing.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Tempering of steel, done after hardening, consists of:
सही उत्तर: ग) Reheating to a moderate temperature and cooling, to reduce brittleness
Hardened steel is very brittle; tempering at a lower temperature relieves stresses and restores some toughness.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In the designation ISMB 300 for a rolled steel section, 'ISMB' stands for:
सही उत्तर: क) Indian Standard Medium weight Beam
ISMB is an I-section medium weight beam; the number gives its depth in millimetres.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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