निर्माण सामग्री – Construction Materials MCQ
निर्माण सामग्री – सिभिल इन्जिनियरिङ
Construction Materials · Civil Engineering · १,००८ प्रश्न
१,००८ प्रश्न उपलब्ध। मोड छान्नुहोस्:
निर्माण सामग्री: 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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A simple field test for good quality cement is that when a hand is thrust into a bag of cement:
सही उत्तर: ख) It should feel cool
Good cement feels cool inside the bag; warmth or lumps indicate partial hydration due to moisture.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Supersulphated cement is made mainly from granulated blast furnace slag and calcium sulphate, and is particularly suitable for:
सही उत्तर: ग) Structures exposed to sulphate-bearing soils or sea water
Supersulphated cement has high resistance to sulphates and sea water.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Oil well cement is specially designed to:
सही उत्तर: घ) Remain workable (retarded setting) at high temperatures and pressures in deep wells
Oil well cement contains retarders so that it remains pumpable under the high temperature and pressure found in deep oil wells.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Quick setting cement is most suitable for:
सही उत्तर: घ) Concreting under water, especially in running water
Quick setting cement sets within a few minutes, so it is useful where concrete must set before water washes it away.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In the grades of OPC designated 33, 43 and 53, the number denotes the:
सही उत्तर: घ) Minimum 28-day compressive strength of standard mortar cubes in N/mm²
For example, 53 grade OPC must reach at least 53 N/mm² compressive strength at 28 days.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In the Vicat test for setting times of cement, the initial setting time is found with a needle of cross-section 1 mm square, while the final setting time is found with:
सही उत्तर: क) A needle fitted with an annular collar (attachment)
Final set is reached when the needle makes an impression but the annular attachment fails to do so.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In the autoclave soundness test, the expansion of ordinary Portland cement should not exceed:
सही उत्तर: ग) 0.8%
The autoclave test, which detects unsoundness due to both lime and magnesia, limits expansion to 0.8%.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In the Le Chatelier soundness test, the expansion of ordinary Portland cement should not exceed:
सही उत्तर: ख) 10 mm
The Le Chatelier expansion limit for OPC is 10 mm, indicating that free lime is within safe limits.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Among the main Bogue compounds of cement, which one contributes least to strength and is responsible for the grey colour?
सही उत्तर: ख) Tetracalcium aluminoferrite (C4AF)
C4AF has little cementing value; it acts mainly as a flux in manufacture and gives cement its grey colour.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Excess free lime in cement is harmful mainly because it:
सही उत्तर: ग) Causes unsoundness, i.e. delayed expansion and cracking of the set cement
Free lime hydrates slowly after the cement has set, causing expansion and cracking; this is unsoundness.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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