इन्जिनियरिङ सेवा सब-इन्जिनियर (पाँचौँ तह) – प्राविधिक पत्र
इन्जिनियरिङ सेवा – सब-इन्जिनियर (पाँचौँ तह)
Sub-Engineer – 5th 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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The strength of a concrete test sample for acceptance is taken as the average strength of how many specimens?
सही उत्तर: ख) 3
Each sample consists of three specimens, and their average is the test result (provided individual variation is within limits).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In the compressive strength test of concrete cubes, the load is applied at a rate of about:
सही उत्तर: घ) 14 N/mm² per minute
IS 516 specifies loading without shock at about 140 kg/cm² (14 N/mm²) per minute until failure.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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As per IS 456, concrete grades M25 to M55 are classified as:
सही उत्तर: ग) Standard concrete
IS 456 groups M10–M20 as ordinary, M25–M55 as standard and M60 and above as high strength concrete.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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As per IS 456, the minimum grade of concrete for reinforced concrete work under 'mild' exposure is:
सही उत्तर: क) M20
IS 456 requires at least M20 for RCC in mild exposure, rising to M25, M30, M35 and M40 for harsher exposures.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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As per IS 456, for reinforced concrete under 'moderate' exposure, the maximum free water-cement ratio is:
सही उत्तर: ख) 0.50
IS 456 specifies for RCC: mild 0.55, moderate 0.50, severe and very severe 0.45, extreme 0.40.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Sulphate attack on hardened concrete causes damage mainly through:
सही उत्तर: ख) Formation of expansive compounds such as ettringite and gypsum
Sulphates react with hydrated aluminates and calcium hydroxide to form ettringite and gypsum, whose expansion cracks the concrete.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Compared with OPC, Portland Pozzolana Cement generally:
सही उत्तर: घ) Gains strength more slowly but produces less heat of hydration and has better durability
Pozzolana reacts slowly with calcium hydroxide, so early strength is lower but heat is reduced and long-term impermeability improves.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In Portland Pozzolana Cement (fly ash based), the proportion of fly ash permitted is generally:
सही उत्तर: ख) 15% to 35%
Fly ash based PPC contains between 15% and 35% fly ash by mass of the cement.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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'False set' of cement refers to:
सही उत्तर: क) Premature stiffening due to dehydrated gypsum, which disappears on remixing without extra water
False set is caused by gypsum dehydrated during grinding recrystallising; plasticity returns on further mixing, unlike flash set.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The tensile strength of cement mortar was traditionally determined by testing:
सही उत्तर: ग) Briquettes of figure-of-eight shape
The briquette test pulls a dumb-bell (figure-8) shaped specimen of 1:3 cement mortar in tension.
💬 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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