सिभिल इन्जिनियरिङ
सिभिल इन्जिनियरिङ
Civil Engineering · ५,१७१ प्रश्न
५,१७१ प्रश्न उपलब्ध। मोड छान्नुहोस्:
सिभिल इन्जिनियरिङ: 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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As per IS 456, the minimum grade of concrete for reinforced concrete under 'severe' exposure is:
सही उत्तर: घ) M30
The minimum RCC grades are M20 (mild), M25 (moderate), M30 (severe), M35 (very severe) and M40 (extreme).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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As per IS 456, when mineral admixtures or blended cements are used, exposed concrete surfaces should be kept moist for a minimum of:
सही उत्तर: ग) 10 days
IS 456 recommends at least 7 days of moist curing for OPC and at least 10 days when mineral admixtures or blended cements are used.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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As per IS 456 (OPC, normal temperature), the props to slabs spanning more than 4.5 m may be removed after:
सही उत्तर: ख) 14 days
Props to slabs spanning up to 4.5 m may be removed after 7 days and those spanning over 4.5 m after 14 days.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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As per IS 456 (OPC, normal temperature), the props to beams spanning more than 6 m should not be removed earlier than:
सही उत्तर: क) 21 days
IS 456 recommends 14 days for props to beams spanning up to 6 m and 21 days for spans over 6 m.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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IS 456 classifies environmental exposure conditions for concrete into how many categories?
सही उत्तर: घ) Five
The five categories are mild, moderate, severe, very severe and extreme.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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As per IS 456, the maximum free water-cement ratio for reinforced concrete under 'mild' exposure is:
सही उत्तर: ग) 0.55
For RCC under mild exposure, IS 456 limits the free w/c ratio to 0.55 (with minimum cement 300 kg/m³ and grade M20).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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As per IS 456, the nominal concrete cover to reinforcement for the 'severe' exposure condition is:
सही उत्तर: ख) 45 mm
IS 456 specifies nominal cover of 20, 30, 45, 50 and 75 mm for mild, moderate, severe, very severe and extreme exposure respectively.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A concrete mix contains 320 kg of cement per cubic metre and has a water-cement ratio of 0.5. The quantity of water per cubic metre is:
सही उत्तर: क) 160 litres
Water = w/c × cement = 0.5 × 320 = 160 kg, i.e. 160 litres.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The specific gravity of cement is determined in the laboratory using a:
सही उत्तर: घ) Le Chatelier flask with kerosene
A Le Chatelier flask is used with kerosene (which does not react with cement) to measure the volume displaced.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Low heat Portland cement, used for mass concrete such as dams, is made with:
सही उत्तर: क) A higher proportion of C2S and lower proportions of C3S and C3A
C3A and C3S liberate the most heat; reducing them and increasing C2S lowers the heat of hydration.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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