इन्जिनियरिङ सेवा असिस्टेन्ट सब-इन्जिनियर (चौथो तह) – प्राविधिक पत्र
इन्जिनियरिङ सेवा – असिस्टेन्ट सब-इन्जिनियर (चौथो तह)
Assistant Sub-Engineer – 4th 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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The specific gravity of most natural aggregates used in concrete lies in the range of about:
सही उत्तर: क) 2.6 to 2.7
Most normal-weight aggregates have a specific gravity of about 2.6–2.7; 3.15 is typical of cement and 7.85 of steel.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The unit weight of reinforced cement concrete commonly used in design is:
सही उत्तर: ख) 25 kN/m³
IS 875 gives 25 kN/m³ for RCC (24 kN/m³ for plain concrete); 78.5 kN/m³ is steel.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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High strength deformed steel bars for concrete reinforcement are specified in:
सही उत्तर: ग) IS 1786
IS 1786 covers high strength deformed bars (Fe 415, Fe 500, etc.); IS 2062 covers structural steel and IS 800 steel design.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The Indian Standard that gives guidelines for concrete mix proportioning (mix design) is:
सही उत्तर: ग) IS 10262
IS 10262 gives the procedure for concrete mix proportioning; IS 456 is the code for plain and reinforced concrete.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Steel and concrete work well together in RCC partly because they have:
सही उत्तर: ख) Nearly equal coefficients of thermal expansion
Their thermal expansion coefficients are similar (about 10–12 × 10⁻⁶ /°C), so temperature changes do not break the bond.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Ferrocement consists of:
सही उत्तर: घ) Thin sections of rich cement mortar reinforced with closely spaced layers of fine wire mesh
Ferrocement uses cement-sand mortar with multiple layers of small-diameter wire mesh, giving thin, strong, crack-resistant elements such as water tanks.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Heavyweight concrete made with aggregates such as barytes or magnetite is used mainly for:
सही उत्तर: ख) Radiation shielding, for example in nuclear plants and X-ray rooms
High-density aggregates give concrete of high unit weight that absorbs gamma and X radiation effectively.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A small amount of sugar accidentally mixed into fresh concrete will:
सही उत्तर: घ) Retard the setting of cement
Sugar is a powerful retarder; even small doses delay setting and large doses can prevent hardening altogether.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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As per IS 456, formwork to vertical faces of walls, columns and beams may generally be struck after:
सही उत्तर: क) 16 to 24 hours
Vertical formwork carries no load once concrete has set, so it can be removed after 16–24 hours with OPC under normal conditions.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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As per IS 456, with ordinary Portland cement and normal temperature, the formwork props to slabs spanning up to 4.5 m may be removed after:
सही उत्तर: ग) 7 days
IS 456 recommends props to slabs up to 4.5 m span after 7 days (14 days over 4.5 m); props to beams up to 6 m after 14 days.
💬 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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