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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Which of the following is an artificial (manufactured) aggregate?
सही उत्तर: ग) Air-cooled blast furnace slag
Blast furnace slag is an industrial by-product, whereas the others are natural aggregates.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The particle size distribution (grading) of an aggregate is determined by:
सही उत्तर: ख) Sieve analysis
Sieving through a standard set of sieves gives the percentage of material in each size range.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Manufactured sand (M-sand) is:
सही उत्तर: क) Fine aggregate produced by crushing hard stone
M-sand is crushed-rock fine aggregate, used as a substitute for river sand.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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As per IS 383, the crushing value of coarse aggregate used for concrete other than wearing surfaces should not exceed:
सही उत्तर: घ) 45%
Crushing value is limited to 45% for general concrete and 30% for wearing surfaces such as runways and roads.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In the aggregate crushing value test, the load applied to the aggregate in the cylinder is:
सही उत्तर: ग) 400 kN applied gradually over 10 minutes
The plunger loads the aggregate uniformly to 400 kN (about 40 tonnes) in 10 minutes.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In the aggregate impact value test, the sample in the cup is subjected to:
सही उत्तर: ख) 15 blows of a 13.5 to 14 kg hammer falling 380 mm
The impact test uses 15 blows of a hammer of 13.5–14 kg dropped from 380 mm.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A coarse aggregate has a loose bulk density of 1600 kg/m³ and a specific gravity of 2.65. The percentage of voids is about:
सही उत्तर: क) 40%
Voids = 1 − bulk density/(G × 1000) = 1 − 1600/2650 = 0.396, i.e. about 40%.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The angularity number of an aggregate, as per IS 2386, generally ranges from:
सही उत्तर: घ) 0 for highly rounded gravel to about 11 for very angular aggregate
Angularity number is 67 minus the percentage of solid volume; it varies from 0 for rounded to about 11 for angular aggregate.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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As a general rule, water suitable for mixing concrete is:
सही उत्तर: ग) Water fit for drinking (potable water)
Potable water is normally satisfactory for mixing and curing concrete.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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As per IS 456, the pH value of water used for mixing concrete should not be less than:
सही उत्तर: ख) 6
Mixing water should have a pH of at least 6 to avoid acid attack on cement and steel.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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