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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An aggregate in which one or more intermediate size fractions are absent is called:
सही उत्तर: घ) Gap graded aggregate
Gap grading omits certain intermediate sizes between fine and coarse fractions.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A well-graded aggregate is desirable in concrete because it:
सही उत्तर: क) Has fewer voids and needs less cement paste
Well-graded aggregates pack densely, reducing voids and therefore cement paste requirement.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Cement stored for a long time in humid conditions loses strength mainly because:
सही उत्तर: ख) It absorbs moisture and partially hydrates (forms lumps)
Cement is hygroscopic; moisture causes partial hydration (lumps), so stored cement loses strength with time.
💬 टिप्पणी / गल्ती रिपोर्ट (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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