माटो र जग – Soil Mechanics & Foundation MCQ
माटो र जग – सिभिल इन्जिनियरिङ
Soil Mechanics & Foundation · Civil Engineering · ४०१ प्रश्न
४०१ प्रश्न उपलब्ध। मोड छान्नुहोस्:
माटो र जग: 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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In a pycnometer test: empty pycnometer 500 g, with dry soil 800 g, with soil and water filled 1500 g, with water only 1311 g. The specific gravity of soil solids is about:
सही उत्तर: ख) 2.70
G = (W2 − W1)/[(W2 − W1) − (W3 − W4)] = 300/(300 − 189) = 300/111 ≈ 2.70.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A soil has void ratio 0.8 and degree of saturation 60%. Its percentage air voids (na) is about:
सही उत्तर: क) 17.8%
n = e/(1 + e) = 0.444; air content ac = 1 − S = 0.4; na = n·ac = 0.444 × 0.4 ≈ 0.178, i.e. 17.8%.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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For a soil with G = 2.7 and e = 0.7 (γw = 10 kN/m³), the submerged (buoyant) unit weight is:
सही उत्तर: क) 10.0 kN/m³
γ' = (G − 1)γw/(1 + e) = 1.7 × 10/1.7 = 10.0 kN/m³ (equal to γsat − γw).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A soil has G = 2.7 and void ratio 0.7. Taking γw = 10 kN/m³, its saturated unit weight is:
सही उत्तर: घ) 20.0 kN/m³
γsat = (G + e)γw/(1 + e) = (2.7 + 0.7) × 10/1.7 = 20.0 kN/m³.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A soil has a porosity of 0.4. Its void ratio is about:
सही उत्तर: घ) 0.67
e = n/(1 − n) = 0.4/0.6 ≈ 0.67.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Talus, the loose rock debris accumulated at the foot of steep hill slopes, is an example of:
सही उत्तर: ख) Colluvial deposit
Colluvium (talus) is moved downslope mainly by gravity and collects at the base of slopes, as commonly seen along Nepal's hill roads.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Soil formed and remaining at the same place where the parent rock weathered is called:
सही उत्तर: ग) Residual soil
Residual soils stay over their parent rock; alluvial, colluvial and lacustrine soils are transported by water, gravity and lake action respectively.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Loess is a soil deposit transported and deposited mainly by:
सही उत्तर: ख) Wind
Loess is a uniform, silt-sized aeolian (wind-blown) deposit.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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For a dry cohesionless infinite slope with φ = 30° and slope angle 20°, the factor of safety is about:
सही उत्तर: ख) 1.59
FS = tanφ/tanβ = 0.577/0.364 ≈ 1.59.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Well foundations, commonly used for bridge piers in rivers, have a sharp bottom component called the:
सही उत्तर: ग) Cutting edge
The cutting edge at the bottom of the curb helps the well sink into the soil.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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