माटो र जग – Soil Mechanics & Foundation MCQ
माटो र जग – सिभिल इन्जिनियरिङ
Soil Mechanics & Foundation · Civil Engineering · ४०३ प्रश्न
४०३ 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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A field compacted fill has a dry density of 17.1 kN/m³ and the laboratory maximum dry density is 18.0 kN/m³. The relative compaction is:
सही उत्तर: ख) 95%
Relative compaction = field γd/max γd × 100 = 17.1/18.0 × 100 = 95%.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The roller best suited for compacting cohesive (clayey) soils in embankments is the:
सही उत्तर: ग) Sheepsfoot roller
Sheepsfoot rollers knead and compact clay from the bottom of each layer upward; vibratory rollers suit granular soils.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A cohesive soil compacted on the dry side of optimum moisture content generally develops:
सही उत्तर: ग) A flocculated structure with higher permeability
Dry of optimum gives a flocculated structure, higher strength and permeability but greater swell potential; wet of optimum gives a dispersed structure.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In a compaction curve, the zero air voids line represents the dry density at:
सही उत्तर: ख) 100% saturation for each water content
The zero air voids line gives the theoretical maximum dry density at each water content if all air were expelled (S = 100%).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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For computing vertical stresses in stratified soils with thin, rigid, non-yielding horizontal reinforcing layers, the theory generally used is:
सही उत्तर: ग) Westergaard's theory
Westergaard's solution assumes lateral strain is prevented by thin rigid layers, suiting stratified soils; Boussinesq assumes a homogeneous isotropic mass.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A permanent lowering of the groundwater table in an area generally causes:
सही उत्तर: ग) An increase in effective stress and settlement of compressible layers
Lowering the water table reduces pore pressure, increasing effective stress, which consolidates clay layers (e.g. land subsidence).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The water table is 2 m below ground. Soil above has γ = 18 kN/m³ and below has γsat = 20 kN/m³. Taking γw = 10 kN/m³, the effective vertical stress at 6 m depth is:
सही उत्तर: ख) 76 kPa
σ = 2 × 18 + 4 × 20 = 116 kPa; u = 4 × 10 = 40 kPa; σ' = 116 − 40 = 76 kPa.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The height of capillary rise in a soil is approximately:
सही उत्तर: ग) Inversely proportional to the void ratio and effective size (C/(e·D10))
Hazen's empirical relation hc = C/(e·D10) shows finer, denser soils have higher capillary rise.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The most reliable method for determining the in-situ average permeability of a large deposit of soil below the water table is:
सही उत्तर: घ) Pumping-out test from a well
A field pumping test measures drawdown in observation wells and gives the average permeability of a large soil mass.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The coefficient of permeability of a soil is approximately proportional to:
सही उत्तर: ख) The square of the effective grain size (D10²)
Hazen's relation k ≈ C·D10² shows permeability varies roughly with the square of the effective size.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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