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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Rice husk ash, when produced by controlled burning, is useful in concrete and mortar as a:
सही उत्तर: ख) Pozzolanic material
Controlled-burnt rice husk ash is rich in reactive amorphous silica and reacts with lime as a pozzolana.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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When fat lime is slaked, its volume increases to about:
सही उत्तर: घ) 2 to 2.5 times the original volume
Fat (rich) lime slakes vigorously with much heat and swells to about two to two-and-a-half times its volume.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Aggregate obtained directly from a pit or river containing both fine and coarse fractions together is called:
सही उत्तर: घ) All-in aggregate
All-in (pit-run) aggregate contains a mixture of fine and coarse sizes as found in nature.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The 'saturated surface-dry (SSD)' condition of aggregate means that:
सही उत्तर: ग) All pores are filled with water but there is no free water on the surface
SSD aggregate neither absorbs water from nor gives water to the mix, so it is the reference state for mix water calculations.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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An aggregate weighs 1020 g in saturated surface-dry condition and 1000 g after oven drying. Its water absorption is:
सही उत्तर: ग) 2%
Absorption = (1020 − 1000)/1000 × 100 = 2% of oven-dry weight.
💬 टिप्पणी / गल्ती रिपोर्ट (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)
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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