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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If damp sand shows 20% bulking, the loose damp volume needed to obtain 1 m³ of sand by dry volume is:
सही उत्तर: ग) 1.20 m³
Bulking of 20% means 1 m³ of dry sand occupies 1.20 m³ when damp, so 1.20 m³ must be measured.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The presence of organic impurities in sand is checked by mixing the sand with a solution of:
सही उत्तर: क) Sodium hydroxide (3%) and comparing the colour
In the colorimetric test, sand is shaken with 3% NaOH; a liquid darker than the standard colour indicates excess organic matter.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which deleterious material in fine aggregate is particularly harmful because its flaky particles reduce bond and workability?
सही उत्तर: घ) Mica
Mica occurs as thin flakes that weaken the bond between cement paste and aggregate and increase water demand.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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As per IS 383, the aggregate impact value of coarse aggregate used for concrete wearing surfaces such as pavements should not exceed:
सही उत्तर: ग) 30%
The limit is 30% for wearing surfaces and 45% for other concrete.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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As per IS 456, the nominal maximum size of coarse aggregate in a reinforced concrete member should not exceed:
सही उत्तर: ग) One-quarter of the minimum thickness of the member
IS 456 limits aggregate size to one-fourth of the minimum thickness and to 5 mm less than the minimum clear spacing or cover.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The specific gravity of most natural aggregates used in concrete lies in the range of about:
सही उत्तर: क) 2.6 to 2.7
Most normal-weight aggregates have a specific gravity of about 2.6–2.7; 3.15 is typical of cement and 7.85 of steel.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The unit weight of reinforced cement concrete commonly used in design is:
सही उत्तर: ख) 25 kN/m³
IS 875 gives 25 kN/m³ for RCC (24 kN/m³ for plain concrete); 78.5 kN/m³ is steel.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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High strength deformed steel bars for concrete reinforcement are specified in:
सही उत्तर: ग) IS 1786
IS 1786 covers high strength deformed bars (Fe 415, Fe 500, etc.); IS 2062 covers structural steel and IS 800 steel design.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The Indian Standard that gives guidelines for concrete mix proportioning (mix design) is:
सही उत्तर: ग) IS 10262
IS 10262 gives the procedure for concrete mix proportioning; IS 456 is the code for plain and reinforced concrete.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Steel and concrete work well together in RCC partly because they have:
सही उत्तर: ख) Nearly equal coefficients of thermal expansion
Their thermal expansion coefficients are similar (about 10–12 × 10⁻⁶ /°C), so temperature changes do not break the bond.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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