इन्जिनियरिङ सेवा असिस्टेन्ट सब-इन्जिनियर (चौथो तह) – प्राविधिक पत्र
इन्जिनियरिङ सेवा – असिस्टेन्ट सब-इन्जिनियर (चौथो तह)
Assistant Sub-Engineer – 4th Level · Engineering Service
१,९४० प्रश्न उपलब्ध। मोड छान्नुहोस्:
प्राविधिक पत्र: प्रश्न र उत्तर
सही लागेको विकल्पमा थिच्नुहोस्। सही भए हरियो, गलत भए रातो देखिन्छ; ५ सेकेन्डपछि सही उत्तर र व्याख्या देखिन्छ।
सही: ० / ०
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Emulsion paints are:
सही उत्तर: घ) Water-based paints in which a binder such as PVA or acrylic is dispersed in water
Emulsion paints use synthetic resin emulsions in water, so they dry quickly, have little odour and can be thinned with water.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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'Chalking' of paint means:
सही उत्तर: क) Formation of a fine powder on the painted surface due to weathering of the binder
Weathering breaks down the binder at the surface, leaving loose pigment that rubs off as powder.
💬 टिप्पणी / गल्ती रिपोर्ट (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)
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।
नमस्ते! पाठ्यक्रम, सामान्य ज्ञान, भाषा परीक्षा वा कुनै प्रश्नको उत्तर बुझ्न सोध्नुहोस्।
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