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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As per IS 269, the maximum permissible magnesia (MgO) content in ordinary Portland cement is:
सही उत्तर: ग) 6%
MgO is limited to 6% because excess periclase hydrates slowly and causes unsoundness (delayed expansion).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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As per IS 269, the ratio of alumina to iron oxide in ordinary Portland cement should not be less than:
सही उत्तर: ख) 0.66
The specification requires the alumina/iron oxide ratio to be at least 0.66.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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As per IS 269, the lime saturation factor of ordinary Portland cement should lie between:
सही उत्तर: क) 0.66 and 1.02
The lime saturation factor limits are 0.66 to 1.02; too much lime causes unsoundness and too little gives weak cement.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The chemical composition of tricalcium aluminate, written in oxide notation, is:
सही उत्तर: घ) 3CaO·Al2O3
C3A stands for 3CaO·Al2O3; C3S is 3CaO·SiO2, C2S is 2CaO·SiO2 and C4AF is 4CaO·Al2O3·Fe2O3.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which Bogue compound is normally present in the largest proportion in ordinary Portland cement?
सही उत्तर: ग) Tricalcium silicate (C3S)
C3S usually makes up roughly 40% to 55% of OPC, more than any other compound.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In viscosity-graded paving bitumen designated VG-30, the number 30 relates to:
सही उत्तर: ग) Its approximate absolute viscosity at 60°C (about 3000 poise)
VG grades are based on absolute viscosity at 60°C; VG-30 has a viscosity of about 2400–3600 poise.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Bitumen can be distinguished from tar because bitumen is completely soluble in:
सही उत्तर: ख) Carbon disulphide
Bitumen is defined as a hydrocarbon material fully soluble in carbon disulphide; tar is only partly soluble.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The flash point test of bitumen is important mainly for:
सही उत्तर: ग) Safety during heating, since it is the temperature at which vapours momentarily ignite
Bitumen must not be heated above its flash point during mixing to avoid fire hazard.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The ductility test of bitumen measures:
सही उत्तर: घ) The distance in cm a standard briquette stretches before breaking
Ductility is the elongation of a standard bitumen briquette pulled at a specified speed and temperature before it breaks.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A bitumen emulsion is:
सही उत्तर: ख) Bitumen dispersed as fine droplets in water with an emulsifying agent
Emulsions allow bitumen to be applied cold and on damp surfaces; the water evaporates or the emulsion breaks, leaving bitumen.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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