इन्जिनियरिङ सेवा सिभिल इन्जिनियर (सातौँ तह) – प्राविधिक पत्र
इन्जिनियरिङ सेवा – सिभिल इन्जिनियर (सातौँ तह)
Civil Engineer – 7th Level · Engineering Service
१,५०३ 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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Cutback bitumen is:
सही उत्तर: घ) Bitumen whose viscosity is reduced by dissolving it in a volatile solvent such as kerosene
Cutbacks are fluid at lower temperatures; the solvent evaporates after laying, leaving the bitumen binder.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The ring and ball apparatus is used to determine which property of bitumen?
सही उत्तर: ग) Softening point
In the ring and ball test, the temperature at which bitumen softens enough for a steel ball to sink through it is the softening point.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The penetration test on bitumen measures its consistency (hardness) as the depth a standard needle penetrates, expressed in units of:
सही उत्तर: क) 0.1 mm
A penetration value of 60 means the needle penetrated 6 mm, i.e. 60 units of 0.1 mm, under standard load, time and temperature.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In the float glass process, molten glass is spread over a bath of:
सही उत्तर: ग) Molten tin
Molten glass floats on molten tin, forming a sheet with flat, parallel, polished surfaces.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Laminated safety glass consists of:
सही उत्तर: घ) Two or more glass sheets bonded with a plastic interlayer (e.g. PVB), which holds fragments together when broken
The plastic interlayer retains broken pieces, so laminated glass is used in windscreens and safety glazing.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Borosilicate glass (such as Pyrex) is used for laboratory ware and ovenware because it has:
सही उत्तर: ग) A low coefficient of thermal expansion and high resistance to heat
Boron oxide lowers thermal expansion, so borosilicate glass resists thermal shock and chemicals.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Saponification of an oil paint applied on fresh cement plaster refers to:
सही उत्तर: ख) Formation of soap by reaction of the alkali in plaster with the oil, so the paint becomes soft and sticky
Free alkali in new plaster reacts with the oil medium forming soap, which destroys the paint film.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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French polish, used on fine furniture, is a solution of:
सही उत्तर: क) Shellac in methylated spirit
French polish is shellac dissolved in methylated spirit, applied in many thin coats to give a high gloss.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Barytes and chalk are added to paints as extenders (inert fillers) mainly to:
सही उत्तर: घ) Reduce cost and add body without affecting the main properties much
Extenders are cheap inert materials that reduce cost and improve body and durability of the paint film.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In oil paints, litharge (lead monoxide) is added as a:
सही उत्तर: ख) Drier, to accelerate drying of the oil
Driers such as litharge act as catalysts for oxidation of the drying oil, so the paint dries faster.
💬 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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