इन्जिनियरिङ सेवा सब-इन्जिनियर (पाँचौँ तह) – प्राविधिक पत्र
इन्जिनियरिङ सेवा – सब-इन्जिनियर (पाँचौँ तह)
Sub-Engineer – 5th Level · Engineering Service
१,५०३ 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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Hydrated (slaked) lime is chemically:
सही उत्तर: ग) Calcium hydroxide, Ca(OH)2
Slaking quick lime with water gives calcium hydroxide.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Quick lime is produced by:
सही उत्तर: ग) Calcination (burning) of limestone, driving off carbon dioxide
CaCO3 → CaO + CO2 on heating; the CaO produced is quick lime.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Hydraulic limes are classified as feebly, moderately or eminently hydraulic depending on their:
सही उत्तर: क) Clay (impurity) content
The greater the clay content, the more hydraulic the lime and the faster it sets under water.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following is a lightweight aggregate?
सही उत्तर: क) Pumice
Pumice is a natural porous volcanic rock used as lightweight aggregate; expanded clay and cinder are other examples.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The soundness test of aggregates using sodium sulphate or magnesium sulphate solution measures resistance to:
सही उत्तर: क) Weathering (disintegration under alternate wetting and drying or freezing)
Repeated cycles of soaking in sulphate solution and drying simulate weathering; the weight loss indicates soundness.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The 'ten percent fines value' test on aggregates determines:
सही उत्तर: ख) The load required to crush aggregate so that 10% of it passes a 2.36 mm sieve
The test finds the load (in kN) needed to produce 10% fines; it is useful for weaker aggregates.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Unwashed sea sand is generally avoided in reinforced concrete because:
सही उत्तर: क) Its salts can cause efflorescence, dampness and corrosion of reinforcement
Sea sand contains chlorides and other salts that absorb moisture, cause efflorescence and corrode steel.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A simple field test for the silt content of sand consists of:
सही उत्तर: क) Shaking sand with water in a measuring jar, allowing it to settle and measuring the silt layer on top
Silt settles more slowly and forms a layer above the sand; its thickness relative to the sand gives the silt content.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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According to IS 383, fine aggregates are graded into Zones I to IV. Which zone represents the coarsest sand?
सही उत्तर: ग) Zone I
Zone I is the coarsest and Zone IV the finest grading of fine aggregate.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In ordinary concrete, aggregates occupy roughly what proportion of the total volume?
सही उत्तर: ग) About 70% to 80%
Aggregates form the bulk (about 70–80% by volume) of concrete, so their properties greatly influence it.
💬 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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