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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The standard consistency test of cement gives the percentage of water at which the Vicat plunger penetrates to a point:
सही उत्तर: घ) 5 to 7 mm from the bottom of the mould
Normal consistency is the water content at which the Vicat plunger penetrates to 5–7 mm from the bottom of the mould.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The Vee-Bee consistometer test expresses the workability of concrete in terms of:
सही उत्तर: क) Time in seconds
In the Vee-Bee test, the time in seconds taken for the concrete to remould from a slump cone shape under vibration measures workability of stiff mixes.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The main purpose of curing concrete is to:
सही उत्तर: ग) Keep it moist so that hydration of cement continues
Curing maintains moisture and temperature so hydration continues, giving strength and durability and reducing shrinkage cracks.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Setting time of cement is determined using:
सही उत्तर: ग) Vicat's apparatus
Vicat's apparatus with its needles and plunger is used for consistency and setting time tests.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The water chemically required for complete hydration of cement is about what percentage of the cement weight?
सही उत्तर: ग) About 23%
Complete hydration needs about 23% water by weight of cement for chemical combination (plus some gel water), so w/c ratios of about 0.38 suffice chemically.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Portland slag cement is produced by intergrinding OPC clinker with:
सही उत्तर: ख) Granulated blast furnace slag
Portland slag cement contains granulated blast furnace slag from steel plants, along with clinker and gypsum.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Hydrophobic cement is especially suitable when cement has to be:
सही उत्तर: ग) Stored for long periods in very wet climates
Hydrophobic cement grains are coated with a water-repellent film, so it can be stored in humid conditions without deterioration.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which cement compound reacts fastest with water and is responsible for flash set?
सही उत्तर: क) Tricalcium aluminate (C3A)
C3A hydrates almost instantly, liberating much heat; gypsum is added to control this flash set.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Expansive cement is particularly useful for:
सही उत्तर: क) Repair work and counteracting shrinkage cracks
Expansive cement expands slightly on setting, offsetting drying shrinkage; it is used in repairs, grouting and joints.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Rapid hardening cement attains at 3 days approximately the strength that ordinary Portland cement attains at:
सही उत्तर: ख) 7 days
Rapid hardening cement gains at 3 days roughly the strength OPC achieves at 7 days.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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