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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For the same water content, rounded aggregates compared with angular aggregates give concrete with:
सही उत्तर: ख) Better workability
Rounded aggregates have less surface area and friction, so the mix is more workable; angular aggregates give better bond.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The aggregate crushing value test measures resistance of aggregate to:
सही उत्तर: क) Crushing under a gradually applied compressive load
Crushing value indicates resistance to gradually applied compressive load, unlike impact value and Los Angeles abrasion.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Cement which contains a high proportion of alumina and gains very high strength within about 24 hours is:
सही उत्तर: ग) High alumina cement
High alumina cement, made from bauxite and limestone, attains very high strength in about a day.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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An aggregate particle is classified as 'elongated' when its greatest dimension exceeds its mean dimension by a factor of more than:
सही उत्तर: ख) 1.8
Elongated particles have length greater than 1.8 times the mean dimension; flaky particles have thickness less than 0.6 times it.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The alkali-aggregate reaction in concrete takes place between alkalis in cement and:
सही उत्तर: घ) Reactive silica in aggregates
Alkalis (Na2O, K2O) react with reactive silica in certain aggregates forming an expansive gel that cracks concrete.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Honeycombing in hardened concrete is mainly caused by:
सही उत्तर: घ) Inadequate compaction or segregation
Honeycombs are voids left where mortar has not filled spaces between coarse aggregate, typically from poor compaction or segregation.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The cement-to-standard sand ratio used in mortar cubes for compressive strength testing of cement is:
सही उत्तर: ग) 1:3
Cement strength cubes are made with 1 part cement to 3 parts standard sand by weight.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The compressive strength of cement is tested on mortar cubes of what size?
सही उत्तर: क) 70.6 mm cubes
Cement mortar cubes of 70.6 mm side (50 cm² face area) with 1:3 standard sand are used.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Water for the initial setting time test of cement is taken as:
सही उत्तर: ख) 0.85 times the water for standard consistency
For setting time tests, the paste is gauged with 0.85P water, where P is the standard consistency.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The water required for standard (normal) consistency of ordinary Portland cement is typically about:
सही उत्तर: ख) 26% to 33% of cement weight
Normal consistency of OPC generally lies between about 26% and 33% water by weight of cement.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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