इन्जिनियरिङ सेवा सिभिल इन्जिनियर (सातौँ तह) – प्राविधिक पत्र
इन्जिनियरिङ सेवा – सिभिल इन्जिनियर (सातौँ तह)
Civil Engineer – 7th Level · Engineering Service
१,९४० प्रश्न उपलब्ध। मोड छान्नुहोस्:
प्राविधिक पत्र: प्रश्न र उत्तर
सही लागेको विकल्पमा थिच्नुहोस्। सही भए हरियो, गलत भए रातो देखिन्छ; ५ सेकेन्डपछि सही उत्तर र व्याख्या देखिन्छ।
सही: ० / ०
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Among the main Bogue compounds of cement, which one contributes least to strength and is responsible for the grey colour?
सही उत्तर: ख) Tetracalcium aluminoferrite (C4AF)
C4AF has little cementing value; it acts mainly as a flux in manufacture and gives cement its grey colour.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Excess free lime in cement is harmful mainly because it:
सही उत्तर: ग) Causes unsoundness, i.e. delayed expansion and cracking of the set cement
Free lime hydrates slowly after the cement has set, causing expansion and cracking; this is unsoundness.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The silica (SiO2) content of ordinary Portland cement is typically in the range:
सही उत्तर: ख) 17% to 25%
Typical OPC contains about 60–67% CaO, 17–25% SiO2, 3–8% Al2O3 and 0.5–6% Fe2O3.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Sandstone is a:
सही उत्तर: घ) Sedimentary rock composed mainly of sand grains cemented together
Sandstone is a sedimentary (siliceous) rock formed by cementation of quartz sand grains.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Limestone and marble are classified chemically as:
सही उत्तर: ख) Calcareous rocks
Both consist mainly of calcium carbonate, so they are calcareous rocks.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Rocks in which clay (alumina) is the predominant constituent, such as slate and laterite, are classified chemically as:
सही उत्तर: घ) Argillaceous rocks
Argillaceous rocks have clay or alumina as the main constituent; siliceous rocks are silica-rich and calcareous rocks are lime-rich.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Rocks such as slate and schist, which can be split into thin layers along definite planes developed by metamorphism, are called:
सही उत्तर: क) Foliated rocks
Foliation is a layered structure developed by pressure during metamorphism, as seen in slate and schist.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Rocks that show distinct layers because they were deposited in beds, such as sandstone and limestone, are called:
सही उत्तर: ख) Stratified rocks
Stratified rocks are sedimentary rocks deposited layer by layer, so they split easily along bedding planes.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Dynamite, an explosive used in quarrying hard rock, consists mainly of:
सही उत्तर: घ) Nitroglycerine absorbed in a porous material
Dynamite is nitroglycerine absorbed in an absorbent material, making it more stable to handle than liquid nitroglycerine.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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For a good building stone, water absorption after 24 hours of immersion should generally not exceed about:
सही उत्तर: ग) 5%
Good building stones are dense, and their water absorption is generally less than 5% by weight.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
यी अभ्यास प्रश्न हुन्, आधिकारिक प्रश्न होइनन्। पाठ्यक्रम, विज्ञापन र नतिजाका लागि सम्बन्धित निकायको आधिकारिक वेबसाइट हेर्नुहोस्। उत्तरमा गल्ती भेटे प्रश्नमुनिको "टिप्पणी / गल्ती रिपोर्ट" मा लेख्नुहोस्।
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